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Selenium 下蝲文�g

Thu, 28 Jan 2016 10:06:00 GMT

我在�|�上搜烦了一下如何��用Selenium下蝲文�g�Q�其中确实有几篇文�g介绍了实现的�Ҏ(gu��)��?br />但是其主要思想都是使用httpClient或者URL获得InputStream, 然后保存到文件中�?br />但是�Q�其中的问题是用��L��录的Session不能�l�持�?br />
我发��C��一个简单的�Ҏ(gu��)��?br />直接使用WebDriver.get, �C�Z��如下�Q?br />
webDriver.get("https://website.com/login");
WebElement element = driver.findElement( By.id( "userID" ) );
element.sendKeys( "user01" );

element = driver.findElement( By.id( "passwd" ) );
element.sendKeys( "password" );

element = driver.findElement( By.name( "Login" ) );
element.submit();

webDriver.get("https://website.cm/download.do?start=xx&end=yy");
String source = webDriver.getPageSource();

�q�个source��是我们想保存的要下载的内容�?br />只要把这个String写到一个文件中�Q�就实现了文件下载的目的

云自无心水自�?/a> 2016-01-28 18:06 发表评论

openpgp 验证�{�֐�

Fri, 11 Dec 2015 13:40:00 GMT

摘要: 在我的上一��文章中介绍了如何进行GPG加密解密�?
加密解密的基本操作流�E�是�Q�用户��用公钥对明文�q�行加密�Q�解密方使用�U�钥对密文进行解密�?

在实际应用中�Q�除了加密保证文本内容不泄露外，同时�q�要考虑能够验证密文发送方的��n份，比较普遍使用的方法就是签名�?
本文主要对具体的�Ҏ(gu��)��q�行介绍�q��上源代码�?nbsp; 阅读全文

云自无心水自�?/a> 2015-12-11 21:40 发表评论

解决apache james 3.0 Beta5不能发送邮件的问题

Thu, 08 Oct 2015 00:45:00 GMT

今天下蝲了Apache James 3.0 Beta 5, 文�g名：james-server-app-3.0.0-beta5-20150627.102412-1076-app.zip
解压�Q�运行run.bat

然后�Q�注册domain
james-cli --host localhost adddomain example.com
��d��用户

james-cli.bat --host localhost adduser test�Q�example.com password

然后��试发送邮�Ӟ��客户端显�C�发送成功，但是james服务器报错，找不到MimeConfig的无参数构造函数�?br />解决�Ҏ(gu��)��Q?br />使用旧的mime4j的jar包替换james 3.0 beta5中自带的最新包�?br />beta5中自带的�?.8.0版，apache�|�站中可以下载到0.7.2
下蝲apache-mime4j-0.7.2-bin.zip, ��其中的apache-mime4j-core-0.7.2.jar, apache-mime4j-dom-0.7.2.jar复制到james\lib目录�Q?br />�q�将其更名覆盖原有的

apache-mime4j-core-0.8.0-20150617.024907-738.jar

apache-mime4j-dom-0.8.0-20150617.024927-735.jar

重新启动james�Q?发送邮�Ӟ�� 成功�?br />

云自无心水自�?/a> 2015-10-08 08:45 发表评论

Tue, 16 Jun 2015 13:27:00 GMT

本文��简单介�l�如何��用PowerMock和Mockito来mock
1. 构造函�?br /> 2. 静态函�?br /> 3. 枚�D实现的单�?br /> 4. 选择参数值做为函数的�q�回�?br /> 5. 在调用mock出来的方法中,改变�Ҏ(gu��)��参数的�?br />
一点简要说明：Mockito其实已经可以满��大部分的需求，但是它的实现机制是��用cglib来动态创建接口的�cȝ��实例。但是这�U�实现方式不能用于构造函数和静态函敎ͼ�因�ؓ那需要��用类的字节码�Q�比如��用javassist). 所以我们才需要结合��用PowerMock.

1. mock构造函�? 如果有代码没有��用DI注入依赖实例�Q�在单元��试中可以��用PowerMock来模拟创建对象�?br /> 注意的开始两行的2个注�?@RunWith �?@PrepareForTest
@RunWith比较��单，后面始终是PowerMockRunner.class
@PrepareForText后面需要加的是调用构造函数的�c�d��Q�而不是有构造函数的�c�L��w��?br /> 在下面的例子中，我们要测试的�c�L��Q�Helper, 在Helper�c�M��调用了Somthing�cȝ��构造函数来创徏实例�?br />

@RunWith(PowerMockRunner.class)
@PrepareForTest(Helper.class)
public class HelperTest {
  @Mock
  private Something mockSomething;

  @InjectMocks
  private Helper helper;

  @Test
  public void doSomething() throws Exception {
      String argument = "arg";

      PowerMockito.whenNew(Something.class).withArguments(argument).thenReturn(mockSomething);

      // 调用需要测试方�?br />       helper.doSomething(argument);

      // �q�行验证
      verify(mockSomething).doIt();
  }
}

public class Helper �?br /> public void doSomething(String arg) {
Something something = new Something(arg);
something.doit();
}
}

2�Q�mock 静态函敎ͼ� 单例模式��是一个典型的会调用静态函数的例子�?注意要点与mock构造函数相同�?br />

class ClassWithStatics {
  public static String getString() {
    return "String";
  }

  public static int getInt() {
    return 1;
  }
}

@RunWith(PowerMockRunner.class)
@PrepareForTest(ClassWithStatics.class)
public class StubJustOneStatic {
  @Test
  public void test() {
    PowerMockito.mockStatic(ClassWithStatics.class);

    when(ClassWithStatics.getString()).thenReturn("Hello!");

    System.out.println("String: " + ClassWithStatics.getString());
    System.out.println("Int: " + ClassWithStatics.getInt());
  }
}

3。mock枚�D实现的单�?br />

SingletonObject.java

public enum SingletonObject { 
    INSTANCE; 
    private int num; 
    protected void setNum(int num) { 
        this.num = num; 
    } 
    public int getNum() { 
        return num; 
    } 
}

SingletonConsumer.java

public class SingletonConsumer {

    public String consumeSingletonObject() { 

        return String.valueOf(SingletonObject.INSTANCE.getNum()); 

    } 
}

SingletonConsumerTest.java

@RunWith(PowerMockRunner.class) 
@PrepareForTest({SingletonObject.class}) 
public class SingletonConsumerTest { 
    @Test public void testConsumeSingletonObject() throws Exception { 
        SingletonObject mockInstance = mock(SingletonObject.class); 
        Whitebox.setInternalState(SingletonObject.class, "INSTANCE", mockInstance); 
        when(mockInstance.getNum()).thenReturn(42); 
        assertEquals("42", new SingletonConsumer().consumeSingletonObject()); 
    } 
}

4。返回参数值做为函数返回倹{�?br /> mockito 1.9.5之后�Q�提供一个方便的�Ҏ(gu��)��来实现这个需要，在这之前可以使用一个匿名函数来�q�回一个answer来实现�?br />

when(myMock.myFunction(anyString())).then(returnsFirstArg());

其中returnsFirstArg()是org.mockito.AdditionalAnswers中的一个静态方法�?br /> 在这个类中还有其他的一些类似方�?br /> returnsSecondArg()

returnsLastArg()

ReturnsArgumentAt(int position)

5. 在调用mock出来的方法中,改变�Ҏ(gu��)��参数的�?br />

when( myMock.someMethod( any( List.class ) ) ).thenAnswer( ( new Answer<Void>() {
    @Override
    public Void answer( InvocationOnMock invocation )
            throws Throwable {
        Object[] args = invocation.getArguments();
        List arg1 = (List)args[0];
        arg1.add("12345");
        return null;
    }
} ) );

Verifying with generic parameters
verify(someService).process(Matchers.<Collection<Person>>any());

verify(adunoMasterBaseProcessor).processBinFiles( anyListOf(File.class) );

云自无心水自�?/a> 2015-06-16 21:27 发表评论

��要说明如何在eclipse中的tomcat中进行配�|��用springloaded在热加蝲更改的类

Thu, 11 Jun 2015 13:59:00 GMT

Oracle提供的JDK其实已经自带一定程度的热加载功能，但是如果你修改了�c�d��Q�方法名�Q�或者添加了新类�Q�新�Ҏ(gu��)��的话�?br />Tomcat都需要重新启动来使得刚才的更改生效�?br />而JRebel和springloaded都能有效地解册��个问题。其中springloaded是开源��Y�Ӟ��可以免费使用�Q�尤光��得�?br />其主��：https://github.com/spring-projects/spring-loaded
在官斚w��面的��单介�l�中�Q�作者只讲述了如何在java�E�序中应用springloaded�Q�而没有说明如何在tomcat中进行配�|��?br />本文��简要进行介�l��?br />
1�Q�下载springloaded到本地目录，比如�Q�c:\temp\springloaded-1.2.3.RELEASE.jar

2. 修改tomcat的应用，��止tomcat自己的热加蝲�Q�方法是在META-INF目录下创建context.xml文�g�Q�里面包含如下语句，关键便是其中讄��reloadable为false

3.在运行环境中��d��springloaded的jar文�g�Q�在eclipse中右键点击项目，run as->run configuration
在弹出的�H�口中，选择Arguments标签�Q�在vm arguments的末��添加：

-javaagent:C:\temp\springloaded-1.2.3.RELEASE.jar -noverify

点击应用按钮�?br />
以上便完成了所有的配置�Q�步骤�ƈ不复杂�?br />

云自无心水自�?/a> 2015-06-11 21:59 发表评论

使用VisualVM来监控包装�ؓwindows服务的java�E�序

Thu, 11 Jun 2015 06:09:00 GMT

java wrapper是一个可以用于将java应用�E�序包装成windows服务的工兗��?br />�q�且可以通过��单的配置来允�怋�用visualVM�q�行监控�?br />
配置�Ҏ(gu��)��Q?br />在wrapper.conf中添加如�?�?br />

wrapper.java.additional.1=-Dcom.sun.management.jmxremote.port=9898 �Q�这里的端口号可以自行选择�?br />wrapper.java.additional.2=-Dcom.sun.management.jmxremote.ssl=false
wrapper.java.additional.3=-Dcom.sun.management.jmxremote.authenticate=false

修改完毕保存后重新启动服务�?br />
打开visualVM, 在菜单中选择 file->Add JMX Connection�?br />在弹出窗口中�Q�connection一��中输入�Q?localhost:9898 卛_��?br />
此配�|�对于jconsole也同��h��效�?img src ="http://www.tkk7.com/usherlight/aggbug/425624.html" width = "1" height = "1" />

云自无心水自�?/a> 2015-06-11 14:09 发表评论

��java.util.logging的日志统一输出到slf4j的框架中

Mon, 27 Apr 2015 07:31:00 GMT

在一些历史遗留代码中�Q�会用到java.util.logging. 如果在新的项目中引用了这些代码，而又不希望去一个一个的修改原来的代码�?br />可以使用slf4j提供的类来�{接这部分的日志输出�?br />
�Ҏ(gu��)��Q?br />1、类路径中添�?br />    slf4j-api-1.7.10.jar
    jul-to-slf4j.1.7.10.jar ( 用于��java.util.logging的日志桥接到slf4j中）
    logback-core.1.1.2.jar
    logback-classic-1.1.2.jar

2、在代码中添加：

       // Optionally remove existing handlers attached to j.u.l root logger
       SLF4JBridgeHandler.removeHandlersForRootLogger(); // (since SLF4J 1.6.5)

       // add SLF4JBridgeHandler to j.u.l's root logger, should be done once during
       // the initialization phase of your application
       SLF4JBridgeHandler.install();

注意事项�Q?br />1、这个桥接可以会造成性能问题�?br />和其他的桥接实现�Q�比如：log4j, commons logging)不同�Q�这个模块�ƈ不真正的完全替代java.util.logging�c�，因�ؓ�q�个java.util.logging是java自带的�?br />所以只是把原来的日志对象进行了转换�Q�简单的��_��q�个转换�q�程是有开销的�?br />关键在于�Q�不��日志语句有没有�Ҏ(gu��)��日志�U�别被关闭，�q�个转换无法避免�?br />
2、不能在�c��\径中攑օ�
slf4j-jkd14.jar
jul-toslf4j.jar

云自无心水自�?/a> 2015-04-27 15:31 发表评论

OpenPGP加密解密文�g

Tue, 09 Dec 2014 22:50:00 GMT

OpenPGP ��L��是世界上使用最�q�泛的邮件加密标�? OpenPGP is the most widely used email encryption standard in the world. ( http://www.openpgp.org/ )
�q�篇例子介绍如何使用�q�个标准�q�行文�g的加密解�?(https://www.bouncycastle.org/latest_releases.html, 需要下�? bcprov-jdk15on-151.jar, bcpg-jdk15on-151.jar).

主要是��用bouncycastle提供的OpenPGP的库来完成这个功能，参照了其提供的示例程序，�q�行了部分改�?( Bouncy Castle 是一�U�用�?Java �q�_��的开放源码的轻量�U�密码术包。它支持大量的密码术��法�Q��ƈ提供 JCE 1.2.1 的实现。因�?Bouncy Castle 被设计成轻量�U�的�Q�所以从 J2SE 1.4 �?J2ME�Q�包�?MIDP�Q��^収ͼ�它都可以�q�行。它是在 MIDP 上运行的唯一完整的密码术包�?
1. ��d��循环遍历来查扄��一个可用的message
2. 需要注意的是在main函数中的�Q?span>如果不添加这一句的�?Security.addProvider(new BouncyCastleProvider()); �E�序�q�行中会报错�Q�No such Provider "BC"
3. 错误Exception in thread "main" java.security.InvalidKeyException: Illegal key size or default parameters , �q�是因�ؓjava�~�省的库支持的key长度比较短，需要到oracle的网站上��M��载一个支持更长key的库覆盖原有的库文�g
/lib/securty/ 目录下的两个jar文�g

local_policy.jar and US_export_policy.jar

搜烦�q�个文�g: Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files

下蝲��面(以JDK6��Z��)�Q?a >http://www.oracle.com/technetwork/java/javase/downloads/jce-6-download-429243.html

package org.bouncycastle.openpgp.examples;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Iterator;

import org.bouncycastle.bcpg.ArmoredOutputStream;
import org.bouncycastle.bcpg.CompressionAlgorithmTags;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openpgp.PGPCompressedData;
import org.bouncycastle.openpgp.PGPEncryptedData;
import org.bouncycastle.openpgp.PGPEncryptedDataGenerator;
import org.bouncycastle.openpgp.PGPEncryptedDataList;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPLiteralData;
import org.bouncycastle.openpgp.PGPOnePassSignatureList;
import org.bouncycastle.openpgp.PGPPrivateKey;
import org.bouncycastle.openpgp.PGPPublicKey;
import org.bouncycastle.openpgp.PGPPublicKeyEncryptedData;
import org.bouncycastle.openpgp.PGPSecretKeyRingCollection;
import org.bouncycastle.openpgp.PGPSignatureList;
import org.bouncycastle.openpgp.PGPUtil;
import org.bouncycastle.openpgp.jcajce.JcaPGPObjectFactory;
import org.bouncycastle.openpgp.operator.jcajce.JcaKeyFingerprintCalculator;
import org.bouncycastle.openpgp.operator.jcajce.JcePGPDataEncryptorBuilder;
import org.bouncycastle.openpgp.operator.jcajce.JcePublicKeyDataDecryptorFactoryBuilder;
import org.bouncycastle.openpgp.operator.jcajce.JcePublicKeyKeyEncryptionMethodGenerator;
import org.bouncycastle.util.io.Streams;

/**
* A simple utility class that encrypts/decrypts public key based
* encryption files.
*

* To encrypt a file: KeyBasedFileProcessor -e [-a|-ai] fileName publicKeyFile.

* If -a is specified the output file will be "ascii-armored".
* If -i is specified the output file will be have integrity checking added.
*

* To decrypt: KeyBasedFileProcessor -d fileName secretKeyFile passPhrase.
*

* Note 1: this example will silently overwrite files, nor does it pay any attention to
* the specification of "_CONSOLE" in the filename. It also expects that a single pass phrase
* will have been used.
*

* Note 2: if an empty file name has been specified in the literal data object contained in the
* encrypted packet a file with the name filename.out will be generated in the current working directory.
*/
public class KeyBasedFileProcessor
{
    private static void decryptFile(
        String inputFileName,
        String keyFileName,
        char[] passwd,
        String defaultFileName)
        throws IOException, NoSuchProviderException
    {
        InputStream in = new BufferedInputStream(new FileInputStream(inputFileName));
        InputStream keyIn = new BufferedInputStream(new FileInputStream(keyFileName));
        decryptFile(in, keyIn, passwd, defaultFileName);
        keyIn.close();
        in.close();
    }

    /**
     * decrypt the passed in message stream
     */
    private static void decryptFile(
        InputStream in,
        InputStream keyIn,
        char[]      passwd,
        String      defaultFileName)
        throws IOException, NoSuchProviderException
    {
        in = PGPUtil.getDecoderStream(in);

        try
        {
            JcaPGPObjectFactory pgpF = new JcaPGPObjectFactory(in);
            PGPEncryptedDataList    enc;

            Object                  o = pgpF.nextObject();
            //
            // the first object might be a PGP marker packet.
            //
            if (o instanceof PGPEncryptedDataList)
            {
                enc = (PGPEncryptedDataList)o;
            }
            else
            {
                enc = (PGPEncryptedDataList)pgpF.nextObject();
            }

            //
            // find the secret key
            //
            Iterator                    it = enc.getEncryptedDataObjects();
            PGPPrivateKey               sKey = null;
            PGPPublicKeyEncryptedData   pbe = null;
            PGPSecretKeyRingCollection  pgpSec = new PGPSecretKeyRingCollection(
                PGPUtil.getDecoderStream(keyIn), new JcaKeyFingerprintCalculator());

            while (sKey == null && it.hasNext())
            {
                pbe = (PGPPublicKeyEncryptedData)it.next();

                sKey = PGPExampleUtil.findSecretKey(pgpSec, pbe.getKeyID(), passwd);
            }

            if (sKey == null)
            {
                throw new IllegalArgumentException("secret key for message not found.");
            }

            InputStream         clear = pbe.getDataStream(new JcePublicKeyDataDecryptorFactoryBuilder().setProvider("BC").build(sKey));

            JcaPGPObjectFactory    plainFact = new JcaPGPObjectFactory(clear);

            Object              message = plainFact.nextObject();

            while ( true ) {
                if (message instanceof PGPCompressedData)
                {
                    PGPCompressedData   cData = (PGPCompressedData)message;
                    JcaPGPObjectFactory    pgpFact = new JcaPGPObjectFactory(cData.getDataStream());

                    message = pgpFact.nextObject();
                }

                if (message instanceof PGPLiteralData)
                {
                    PGPLiteralData ld = (PGPLiteralData)message;

                    String outFileName = ld.getFileName();
                    if (outFileName.length() == 0)
                    {
                        outFileName = defaultFileName;
                    }

                    InputStream unc = ld.getInputStream();
                    OutputStream fOut = new BufferedOutputStream(new FileOutputStream(outFileName));

                    Streams.pipeAll(unc, fOut);

                    fOut.close();
                    break;
                }
                else if (message instanceof PGPOnePassSignatureList)
                {
                    System.out.println("encrypted message contains a signed message - not literal data.");
                }
                else if (message instanceof PGPSignatureList)
                {
                    System.out.println("encrypted message contains a signed message - not literal data.");
                }
                else
                {
                    throw new PGPException("message is not a simple encrypted file - type unknown.");
                }
                message = plainFact.nextObject();
            }

            if (pbe.isIntegrityProtected())
            {
                if (!pbe.verify())
                {
                    System.err.println("message failed integrity check");
                }
                else
                {
                    System.err.println("message integrity check passed");
                }
            }
            else
            {
                System.err.println("no message integrity check");
            }
        }
        catch (PGPException e)
        {
            System.err.println(e);
            if (e.getUnderlyingException() != null)
            {
                e.getUnderlyingException().printStackTrace();
            }
        }
    }

    private static void encryptFile(
        String          outputFileName,
        String          inputFileName,
        String          encKeyFileName,
        boolean         armor,
        boolean         withIntegrityCheck)
        throws IOException, NoSuchProviderException, PGPException
    {
        OutputStream out = new BufferedOutputStream(new FileOutputStream(outputFileName));
        PGPPublicKey encKey = PGPExampleUtil.readPublicKey(encKeyFileName);
        encryptFile(out, inputFileName, encKey, armor, withIntegrityCheck);
        out.close();
    }

    private static void encryptFile(
        OutputStream    out,
        String          fileName,
        PGPPublicKey    encKey,
        boolean         armor,
        boolean         withIntegrityCheck)
        throws IOException, NoSuchProviderException
    {
        if (armor)
        {
            out = new ArmoredOutputStream(out);
        }

        try
        {
            byte[] bytes = PGPExampleUtil.compressFile(fileName, CompressionAlgorithmTags.ZIP);

            PGPEncryptedDataGenerator encGen = new PGPEncryptedDataGenerator(
                new JcePGPDataEncryptorBuilder(PGPEncryptedData.CAST5).setWithIntegrityPacket(withIntegrityCheck).setSecureRandom(new SecureRandom()).setProvider("BC"));

            encGen.addMethod(new JcePublicKeyKeyEncryptionMethodGenerator(encKey).setProvider("BC"));

            OutputStream cOut = encGen.open(out, bytes.length);

            cOut.write(bytes);
            cOut.close();

            if (armor)
            {
                out.close();
            }
        }
        catch (PGPException e)
        {
            System.err.println(e);
            if (e.getUnderlyingException() != null)
            {
                e.getUnderlyingException().printStackTrace();
            }
        }
    }

    public static void main(
        String[] args)
        throws Exception
    {
        Security.addProvider(new BouncyCastleProvider());

        if (args.length == 0)
        {
            System.err.println("usage: KeyBasedFileProcessor -e|-d [-a|ai] file [secretKeyFile passPhrase|pubKeyFile]");
            return;
        }

        if (args[0].equals("-e"))
        {
            if (args[1].equals("-a") || args[1].equals("-ai") || args[1].equals("-ia"))
            {
                encryptFile(args[2] + ".asc", args[2], args[3], true, (args[1].indexOf('i') > 0));
            }
            else if (args[1].equals("-i"))
            {
                encryptFile(args[2] + ".bpg", args[2], args[3], false, true);
            }
            else
            {
                encryptFile(args[1] + ".bpg", args[1], args[2], false, false);
            }
        }
        else if (args[0].equals("-d"))
        {
            decryptFile(args[1], args[2], args[3].toCharArray(), new File(args[1]).getName() + ".out");
        }
        else
        {
            System.err.println("usage: KeyBasedFileProcessor -d|-e [-a|ai] file [secretKeyFile passPhrase|pubKeyFile]");
        }
    }
}

asdf

云自无心水自�?/a> 2014-12-10 06:50 发表评论

Netty

Wed, 26 Nov 2014 23:36:00 GMT

Netty作�ؓ一个异步非��d��式的框架�Q�是不允许在ChannelHandler中长旉��处理事务�Q�比如数据库的操作）�Q�阻塞I�Q�O的读写处理的�?div>
在Netty in Action中是�q�样描述的：

While the I/O thread must not be blocked at all, thus prohibiting any direct blocking operations within your ChannelHandler, there is a way to implement this requirement.

You can specify an EventExecutorGroup when adding ChannelHandlers to the ChannelPipeline.

This EventExecutorGroup will then be used to obtain an EventExecutor, which will execute all the methods of the ChannelHandler.

This EventExecutor will use a different thread from the I/O thread, thus freeing up the EventLoop.

I�Q�O�U�程是不允许被阻塞的�Q�也��是不能在ChannelHandler中进行�Q何阻塞式的处理，但是�Ҏ(gu��)��我们也有相应的解��x��?

��是在把ChannelHanders��d��到ChannelPipeline的时候，指定一个EventExecutorGroup�Q�ChannelHandler中所有的�Ҏ(gu��)��都将会在�q�个指定的EventExecutorGroup中运行�?/div>

而这个EVentExecutorGroup�q�行的线�E�与I/O�U�程不同�Q�达��C��d��I�Q�O的目的�?nbsp;

�E�序�C�Z��如下�Q?/div>

Channel ch = ...;

ChannelPipeline p = ch.pipeline();

EventExecutor e1 = new DefaultEventExecutorGroup(16);

EventExecutor e2 = new DefaultEventExecutorGroup(8);

p.addLast(new MyProtocolCodec());

p.addLast(e1, new MyDatabaseAccessingHandler());

p.addLast(e2, new MyHardDiskAccessingHandler());
需要补充说明一下，上面的示例程序似乎有炚w��题。��用上�q�方法添加ChannelHandler到pipeline中以后，channelHandler的所有方法确实什么在一个单独的�U�程中被处理�?br />但是�Q�每�ơDefaultEventExcutorGroup�U�程池中的线�E�不能被重用�Q�每�ơ都会生成一个新的线�E�，然后在新的线�E�中调用ChannelHandler, 在visualvm可以看到�U�程数量直线增长�?br />
解决的方法是�Q�不能��用局部变量�Ş式的DefaultEventExecutorGroup。而��用类静态成员变量：
static final EventExecutor e1 = new DefaultEventExecutorGroup(16);

我分析原因可能是�Q�在新的�q�接到来�Q�创建ChannelPipeline�l�新Channel的时候，如果不��用静态的�׃�n变量�Q�而��用局部变量的话，��造成DefaultEventExecutorGroup被多�ơ重复创建。因此，虽然一个DefaultEventExecutorGroup中的Thread数量是固定的�Q�但是却产生了多余的DefaultEventExecutorGroup。从VisualVM中也可以看到�Q�DefaultEventExecutorGroup�U�程的名字会是：

xxx-2-1

xxx-3-1

xxx-4-1

xxx-n-1

说明是Group的数量（�W�一个数字）在增多，而不是Group中的�U�程数量(�W�二个数字）在增�?/div>

�Ҏ(gu��)��静态变量后�Q�线�E�名会是�Q?/div>

xxx-2-1

xxx-2-2

xxx-2-3

xxx-2-n

最后一个n��是在创建DefaultEventExecutorGroup时候，传入的线�E�个数参数的大小�?/div>

云自无心水自�?/a> 2014-11-27 07:36 发表评论

Active MQ

Mon, 14 Oct 2013 12:35:00 GMT

P66
1. components:

a. Message

a.1 Header

a.1.1 Destination

a.1.2 DeliveryMode: persistent, non-persistent

a.2 Body

b. Queue

c. Client

c.1 Producer

c.2 Consumer - Message Selector

d. Domain, 2 styles of messaging

d.1 point-to-point

d.1.1 destination known as QUEUE

d.1.2 similar to person to person email sent through a mail server

d.1.3 multiple consumers can be registered on a single queue

but only one consumer will receive a a given messge

and it's upt to that consumer to acknowledge the message

d.2 publish-subscribe

d.2.1 destination known as TOPICS

d.2.2 publishers send messages to the topic

and subscribers register to receive messages from the topic

d.2.3 durable subscriptions allow for subscriber disconnection without missing any messages

云自无心水自�?/a> 2013-10-14 20:35 发表评论

Spring Security中指定session��时后蟩转的��面

Tue, 30 Aug 2011 23:25:00 GMT

Spring Security中指定session��时后蟩转的��面

在xml配置文�g中加入：

云自无心水自�?/a> 2011-08-31 07:25 发表评论

Spring MVC + Spring Security + Spring JDBC中注入dataSource��L��为Null的原因和解决

Fri, 26 Aug 2011 00:57:00 GMT

在applicationContext.xml中定义了一个DataSource�Q?lt;bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" />
但是在代码中�Q��用anotation�q�行注入的时候，却��L��找不到这个dataSource.

   @Autowired
   public void setDataSource(DataSource dataSource) {
       jdbcTemplate = new JdbcTemplate(dataSource);
       jdbcInsert = new SimpleJdbcInsert(dataSource);
   }

最后终于想明白了，原因大概是这��L��Q��用autowired的时候，默认是根据类型来匚w��的，在xml中定义的�c�d��是：BasicDataSource�Q�而不是接口DataSource�Q�所以默认情况下�q�样是无法自动装配的。解军_��法是指��o使用名字来进行bean的匹配，也就是用Qualifier指定bean的id.

   @Autowired
   public void setDataSource(@Qualifier("dataSource") DataSource dataSource) {
       jdbcTemplate = new JdbcTemplate(dataSource);
       jdbcInsert = new SimpleJdbcInsert(dataSource);
   }

另外一点，在网上搜索的�q�程中发现有不少人都有类似的问题�Q�但是他们的原因是没有正��用spring的注入，而是自己在代码中new了一个Dao的实例，�q�样的话�Q�spring是无法将dataSource注入到dao的实例中�?/div>

云自无心水自�?/a> 2011-08-26 08:57 发表评论

打开有密码保护（但是没有加密�Q�的excel文�g

Mon, 30 May 2011 02:42:00 GMT

主要是��用：

Biff8EncryptionKey.setCurrentUserPassword(password);

在打开workbook之前

HSSFWorkbook workbook = new HSSFWorkbook(inp);

注意事项�Q�这个应该是只适用于xls,而不是xlsx

云自无心水自�?/a> 2011-05-30 10:42 发表评论

Mon, 28 Mar 2011 21:53:00 GMT

Tapestry5 in action现在�q�只是提供MEAP形式的订购，MEAP-Manning Early Access Program, 也就是提前试阅的意思，如果读者订购了此版本，那么manning会在作者每完成一章后�Q�将该章节发�l�订购者，订购者可以提交自��q��反馈�Q�manning会根据情况发布相应的错误修改信息�?/div>

目前此书的第一章可以免费下载：

http://www.tkk7.com/Files/usherlight/Tapestry5%20in%20action%20MEAP%20ch01.zip

云自无心水自�?/a> 2011-03-29 05:53 发表评论

java串口�~�程需要注意的几个地方

Mon, 07 Feb 2011 05:22:00 GMT

我��用的是sun提供的javax.comm包，不确定其他的comm支持包（比如�Q�rxtx)行�ؓ与之相同

1、事仉��动的数据��d��

需要注意的是：一个SerialPort只能注册一个事件监听程序，因此�Q�有时候有会发玎ͼ�你的事�g监听处理�E�序会变得非常庞�?/div>

另外�Q�要注意的就是事件处理如果比较耗时的话�Q�最好是在单独的�U�程中运行，否则会阻塞数据的接收�?/div>

串口接收到数据后�Q�默认在�U�程: Win32SerialPort Notification thread中运行。如果不及时释放的话�Q�会造成数据无法��d��?/div>

我的做法是，接收到数据后�Q�先判断数据的合法和完整性，如果没有接收到完整的数据�Q�则在缓存数据后�Q�马上返�?/div>

如果数据完整而且合法�Q�则另开一个线�E�，�q�行数据处理

2、数据的发�?/div>

��单独使用一个线�E�来发送数据，目的�q�是��Z��防止��d��Q�有一个技巧就是��用OUTPUT_BUFFER_EMPTY事�g来发送�?/div>

云自无心水自�?/a> 2011-02-07 13:22 发表评论

Tue, 14 Dec 2010 23:51:00 GMT

1、用@RequestParam获取HttpServletRequest里的参数值相当方便，spring可以�q�行自动的类型�{�?/div>

2、对于Restful的支持，�l�合@RequestMapping的UriTemplate和method以及@PathVariable�Q�非常方便地实现了restful的url

3、对于Ajax的支持，@RespsonseBody提供了方便的机制

4、灵�z�M��富的@Controller的函数返回类�?/div>

5、可以方便地�l�@Controller函数注入各种资源

其他的一些别的框枉��有特性，诸如国际化，文�g上传什么的��׃��说了

云自无心水自�?/a> 2010-12-15 07:51 发表评论

Tue, 23 Nov 2010 22:08:00 GMT

1、Tapestry5.2.4的发布，Tapestry5.2.3版本在内部投��中被否冻I��主要是因��Z��用maven快速创建的原型有问题）�Q�所以在被否决的3天后便发布了5.2.4,相对5.2.2来说�Q�变动�ƈ不大�Q�只�?个错误修复和5个功能改�q�。但是至��说明Tapestry的项目还在顺利的�q�行中�?br /> 2、Tapestry主页的全新改版。主要是完善了文档。这一�Ҏ(gu��)��非常重要的，Tapestry��目�l�的成员也承认Tapestry在推销自己或者是在市场推�q�方面做得非常失�?very bad in marketing)�Q�所以最�q�也采取了一些措施来�q�行改变�Q�比如，预计明年会发行Tapestry5 in action一书等�{��?br /> 3、还有一件事需要提及的是：appfuse的作者最�q�对web框架�q�行了一番对比http://raibledesigns.com/rd/entry/my_comparing_jvm_web_frameworks�Q�Tapestry�?3个框架中名列�W?�Q�刚好是中间的位�|�。Tapestry��目的成员颇有不满，认�ؓ作者Matt Raible对Tapestry不够了解�Q�有误导观众之嫌。Tapestry��目成员I(y��)gor E. Poteryaev认�ؓMatt�?认识度，开发效率，��目健康度，��试友好性，scalability�{�方面严重低��C��Tapestry的能力�?br />

云自无心水自�?/a> 2010-11-24 06:08 发表评论

Tue, 02 Nov 2010 00:10:00 GMT

1、发布了MyBatis3.0.3, 具体内容不详�Q�没有能够发现release notes.
2、发布了mybatis-generator 1.3.0, �q�是一个能够根据数据库的表自动生成mybatis�?br />         sqlmap xml文�g
        与数据表对应的java class
        使用上两个文件的java�c?br /> 我下载后�Q�尝试着使用了一下，发现需要有一个配�|�文�Ӟ��我觉得应该是用于提供数据库连接的信息。但是配�|�文件的格式不详�?br /> 现在发现mybatis的文档比较成问题�Q�很多东襉K��没有说明�Q��用�v来很困难啊�?br /> 3、新增了两个中方��译文档
        # MyBatis 3 User Guide Simplified Chinese.pdf
        # MyBatis-Spring Reference Simplied Chinese.pdf
4、发布了mybatis-spring-1.0.0-RC2
5、发布了mybatis-guice-1.0.0-RC3

云自无心水自�?/a> 2010-11-02 08:10 发表评论

Mon, 01 Nov 2010 23:58:00 GMT

主要是一些bug修复和改�q�，最重要的一�Ҏ(gu��)��能够从link对象生成�l�对路径了�?br /> �q�主要是便于ajax的��用�?br />

Bug

    * Element.forceAttribute uses the element's namespace to match the attribute.
    * Element.attribute(String name, String value) adds elements that already exist
    * Element#addClassName can create an additional new 'class' attribute
    * Properties defined in an Interface are not exposed by PropertyAccess for abstract classes that do not directly implement the methods
    * Some services require a notification that they have been reloaded, so they can clean up external dependencies
    * Whitespaces in SymbolConstants.SUPPORTED_LOCALES cause that locales are not persised
    * Validation macros do not work when used in @Validate annotation
    * Client-side validation of @Pattern is broken
    * Linking a Form to a Zone will no longer work unless the Form contains validated fields
    * When using PropertyShadowBuilder to build a service, if the property is null, an immediate exception is needed (rather than a NullPointerException)
    * When using a MultiZoneUpdate, Tapestry will clear the referenced zone

Improvement

    * Add the facility to optionally disable on-focus-change triggered validation while retaining the on-form-submit validation
    * Form component should be able to render a secure URL even on an insecure page
    * New annotations @Decorate and @Advise to identify methods that decorate or annotate services
    * Extend Link with new methods for producing absolute URLs (that include scheme, hostname, etc.)
    * Simplify connecting a link or form to an (enclosing) Zone
    * BeanBlockContribution should be split into two sub-classes: EditBlockContribution and DisplayBlockContribution
    * Define a special CSS class to prevent a client-side form from submitting normally (for Ajax use cases)
    * Additional method for Link: addParameterValue(String,Object) that uses ContextPathEncoder to encode object value to a string
    * SeleniumTestCase should expose the underlying CommandProcessor, to allow execution of commands not defined by the Selenium interface
    * Allow individual SeleniumTestCases to run w/o configuring SeleniumLauncher

云自无心水自�?/a> 2010-11-02 07:58 发表评论

Tapestry5.2.1 Beta已经发布

Tue, 19 Oct 2010 23:38:00 GMT

今天在网上�{了�{�Q�发现Tapestry又有了新动作�?br /> 1、从5.2.0alpha�?�?1日发布到现在�Q�终于发�?.2.1Beta版了。这个版本主要是修改alpha版本中的bug.
5.2相对�?.1�q�行了许多重大的改进�Q�详�l�内容可见：Tapestry5.2的新变化
2、据�U�在5.3版中��引入大量的新功能，具体内容不详�?br /> 3、以往最令�h诟病的文��问题，目前开发小�l�也在努力解冟�?br /> 首先�Q�徏立了新的文档�|�页�Q�http://people.apache.org/~uli/tapestry-site/�Q�不�q�目前这个网站还没有完全完成�Q�只能算是预览版�Q�但是这毕竟是在正确的道路上前进�?br /> 其次�Q�Tapestry 5 in action一书正在写作中�Q�已�l�完�?0%�Q�预计明�q�一季度能够出版�?br /> 我相信，随着功能的不断完善和补充�Q�再加上文��的逐渐充实�Q�Tapestry完全有理��p��吸引更多的开发者来��x��和��用�?/p>

云自无心水自�?/a> 2010-10-20 07:38 发表评论

mybatis3.0.2已经发布

Mon, 13 Sep 2010 04:42:00 GMT

�q�是mybatis从ibatis更名�q�来后，发布的第2个版本（�W?个版本是3.0.1)�?br /> 在这个版本中只修复了4个bug(感觉数目有点��，��N��是因��Z��一个版本的bug真的如此之少?)�Q�增加了一个小功能.
作者的话：��管只有5个修改，但我�q�是觉得值得为此发布一个新版本�?br /> �q?个修�Ҏ(gu��)��Q?br /> 1、在org.apache.ibatis.Session中增加了一个新�Ҏ(gu��)��Q�void select(String statement, ResultHandler handler);
原来只有�Q?br /> void select(String statement, Object parameter, ResultHandler handler);
void select(String statement, Object parameter, RowBounds rowBounds, ResultHandler handler);

2、修复了ManagedConnection中关闭连接的问题
3、修复了schema migration中，语句提交(statement commit)不正��的问题
4、修复了延迟加蝲已经预读取属性时的问�?br /> 5、修复了schema migration中，FileInputStream没有正确关闭的问�?br />

云自无心水自�?/a> 2010-09-13 12:42 发表评论

Tapestry5.2的新变化

Tue, 17 Aug 2010 23:13:00 GMT

Tapestry开发小�l�中的一个成员的blog中记录了5.2版本带来的新变化
1、增��Z��class reload的功能（我个��Z��认�ؓ�q�一�Ҏ(gu��)��5.2版本最令�h�Ȁ动的改进�Q�，以前Tapestry和其他的web框架�c�M��Q�修攚w��面不需要重新启动application server, 但是修改了类之后�Q�必��重新启动应用服务器才行。但是在Tapestry5.2中，对这一点进行了修改�Q�如果只改变了接口的实现�c�，而不改变接口的方法签名，��׃��需要重新启动应用服务器
2、新增了若干个组�Ӟ��比如�Q�Error和Trigger�?br /> Error和原有的Errors�c�M��Q�但是Error用于�l�指定的�l��g昄��验证错误信息�?br /> Trigger提供了在��L��面�q�程中触发�Q务事件的功能�Q�常常用于通过RenderSupport来给��面��d��JavaScript代码
3、新的插�?Mixin),包括RenderClientId, RenderNotification
4、集成了JSR-303 Bean的验证，现在可以在页面中使用JSR-303标准的注解来�l�字�D�|��定需要的验证
5、新的注解，包括@Contribute,@RequestParameter, @ActivationRequestParameter, 使用后两个注解能很容易地获取request中的参数
6、新的页面生命周期事�Ӟ��pageReset
7、链接修饰过�E�中的新事�g: decoratePageRenderLink, decoreateComponentEventLink
8、页面解析器的更换，原来使用StAX�Q�造成了对Google App Engine和对OSGI的不兼容�Q?.2版本中��用了标准的SAX解析�?br /> 9、页面缓冲池的废除（我认��?.2版本的一个相当大而且也是非常重要的一个变化，我认为页面缓冲池技术是tapestry学习曲线陡峭的一个重要原因）�Q?.2版本中所有页面将只有一个实例（也就是lewis howard说的单例化）�Q�页面属性的值将会在每个�U�程中��用一个Map来保存。这样一个页面实例可以在多个�U�程中��用，而不会有同步问题�?br /> 但是�Q�由于这是一个新的尝试，所以lewis也不��定�q�样做的效果是否很好�Q�详见：http://tapestryjava.blogspot.com/2010/07/everyone-out-of-pool-tapestry-goes.html�Q�所以，�?.2中可以通过配置恢复��面�~�冲池的使用�?img src ="http://www.tkk7.com/usherlight/aggbug/329170.html" width = "1" height = "1" />

云自无心水自�?/a> 2010-08-18 07:13 发表评论

Tapestry5.2的alpha版本已经发布

Thu, 15 Jul 2010 00:20:00 GMT

今天打开tapestry的网站，发现tapestry5.2的alpha版本已经发布出来了�?br /> �?.2中还是新增了不少令�h�Ȁ动的功能
1、QueryParameterMapped注解�Q��用这个注解可以很方便地把request中的参数映射到bean里的属�?br /> 2、（�q�是最让我期待的功能）服务�l�于能够动态加载了�Q?br /> 3、在事�g处理�Ҏ(gu��)��中可以��用QueryParameter来注解参�?br /> 4、submit�l��g现在可以cancel表单里的数据�?br /> 5、不再��用StAX作�ؓtml的解析器了，而是采用标准的SAX解析器，�q�样减少外界引用�Q�而且兼容性更�?br /> 6、组件中也可以��用SessionAttribute来获得session中的数据了，以前好像只有在page中才能用
7、引入了JSR-303 Bean Validation Integration Library.

云自无心水自�?/a> 2010-07-15 08:20 发表评论

Mon, 05 Jul 2010 01:38:00 GMT

CardLayout布局��理器能够帮助用户处理两个以��x��多的成员�׃�n同一昄��I�间,它把容器分成许多�?每层的显�C�空间占据整个容器的大小,但是每层只允许放�|�一个组�?当然每层都可以利用Panel来实现复杂的用户界面.布局��理器（CardLayout�Q�就象一副叠得整整齐齐的扑克牌一�?�?4 张牌,但是你只能看见最上面的一张牌,每一张牌��q��当于布局��理器中的每一�?

��式布局��理器把容器看成一个行集，好象�q�x��在一张纸上写字一��P��一行写满就换下一行。行高是用一行中的控仉��度决定的。FlowLayout是所�?JApplet/JApplet的默认布局。在生成��式布局时能够指定显�C�的寚w��方式�Q�默认情况下是居中（FlowLayout.CENTER�Q?/p>

GridLayout ��成员按�|�格型排列，每个成员��可能地占据�|�格的空��_��每个�|�格也同样尽可能地占据空��_��从而各个成员按一定的大小比例攄��。如果你改变大小�Q?GridLayout��相应地改变每个�|�格的大��，以��各个�|�格��可能地大，占据Container容器全部的空间�?br /> 基本布局�{�略是把容器的空间划分成若干行乘若干列的�|�格区域�Q�组件就位于�q�些划分出来的小区域中，所有的区域大小一栗��组件按从左到右�Q�从上到下的�Ҏ(gu��)��加入�?/p>

BoxLayout布局能够允许��控件按照X��_��从左到右�Q�或者Y��_��从上��C��Q�方向来摆放�Q�而且沿着主��u能够讄��不同��寸�?/p>

云自无心水自�?/a> 2010-07-05 09:38 发表评论

Tue, 22 Jun 2010 23:16:00 GMT

HTTP Status Codes Explained

All valid HTTP 1.1 Status Codes simply explained.

HTTP, Hypertext Transfer Protocol, is the method by which clients (i.e. you) and servers communicate. When someone clicks a link, types in a URL or submits out a form, their browser sends a request to a server for information. It might be asking for a page, or sending data, but either way, that is called an HTTP Request. When a server receives that request, it sends back an HTTP Response, with information for the client. Usually, this is invisible, though I'm sure you've seen one of the very common Response codes - 404, indicating a page was not found. There are a fair few more status codes sent by servers, and the following is a list of the current ones in HTTP 1.1, along with an explanation of their meanings.

A more technical breakdown of HTTP 1.1 status codes and their meanings is available at http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html. There are several versions of HTTP, but currently HTTP 1.1 is the most widely used.

Informational

100 - Continue
A status code of 100 indicates that (usually the first) part of a request has been received without any problems, and that the rest of the request should now be sent.
101 - Switching Protocols
HTTP 1.1 is just one type of protocol for transferring data on the web, and a status code of 101 indicates that the server is changing to the protocol it defines in the "Upgrade" header it returns to the client. For example, when requesting a page, a browser might receive a statis code of 101, followed by an "Upgrade" header showing that the server is changing to a different version of HTTP.

Successful

200 - OK
The 200 status code is by far the most common returned. It means, simply, that the request was received and understood and is being processed.
201 - Created
A 201 status code indicates that a request was successful and as a result, a resource has been created (for example a new page).
202 - Accepted
The status code 202 indicates that server has received and understood the request, and that it has been accepted for processing, although it may not be processed immediately.
203 - Non-Authoritative Information
A 203 status code means that the request was received and understood, and that information sent back about the response is from a third party, rather than the original server. This is virtually identical in meaning to a 200 status code.
204 - No Content
The 204 status code means that the request was received and understood, but that there is no need to send any data back.
205 - Reset Content
The 205 status code is a request from the server to the client to reset the document from which the original request was sent. For example, if a user fills out a form, and submits it, a status code of 205 means the server is asking the browser to clear the form.
206 - Partial Content
A status code of 206 is a response to a request for part of a document. This is used by advanced caching tools, when a user agent requests only a small part of a page, and just that section is returned.

Redirection

300 - Multiple Choices
The 300 status code indicates that a resource has moved. The response will also include a list of locations from which the user agent can select the most appropriate.
301 - Moved Permanently
A status code of 301 tells a client that the resource they asked for has permanently moved to a new location. The response should also include this location. It tells the client to use the new URL the next time it wants to fetch the same resource.
302 - Found
A status code of 302 tells a client that the resource they asked for has temporarily moved to a new location. The response should also include this location. It tells the client that it should carry on using the same URL to access this resource.
303 - See Other
A 303 status code indicates that the response to the request can be found at the specified URL, and should be retrieved from there. It does not mean that something has moved - it is simply specifying the address at which the response to the request can be found.
304 - Not Modified
The 304 status code is sent in response to a request (for a document) that asked for the document only if it was newer than the one the client already had. Normally, when a document is cached, the date it was cached is stored. The next time the document is viewed, the client asks the server if the document has changed. If not, the client just reloads the document from the cache.
305 - Use Proxy
A 305 status code tells the client that the requested resource has to be reached through a proxy, which will be specified in the response.
307 - Temporary Redirect
307 is the status code that is sent when a document is temporarily available at a different URL, which is also returned. There is very little difference between a 302 status code and a 307 status code. 307 was created as another, less ambiguous, version of the 302 status code.

Client Error

400 - Bad Request
A status code of 400 indicates that the server did not understand the request due to bad syntax.
401 - Unauthorized
A 401 status code indicates that before a resource can be accessed, the client must be authorised by the server.
402 - Payment Required
The 402 status code is not currently in use, being listed as "reserved for future use".
403 - Forbidden
A 403 status code indicates that the client cannot access the requested resource. That might mean that the wrong username and password were sent in the request, or that the permissions on the server do not allow what was being asked.
404 - Not Found
The best known of them all, the 404 status code indicates that the requested resource was not found at the URL given, and the server has no idea how long for.
405 - Method Not Allowed
A 405 status code is returned when the client has tried to use a request method that the server does not allow. Request methods that are allowed should be sent with the response (common request methods are POST and GET).
406 - Not Acceptable
The 406 status code means that, although the server understood and processed the request, the response is of a form the client cannot understand. A client sends, as part of a request, headers indicating what types of data it can use, and a 406 error is returned when the response is of a type not i that list.
407 - Proxy Authentication Required
The 407 status code is very similar to the 401 status code, and means that the client must be authorised by the proxy before the request can proceed.
408 - Request Timeout
A 408 status code means that the client did not produce a request quickly enough. A server is set to only wait a certain amount of time for responses from clients, and a 408 status code indicates that time has passed.
409 - Conflict
A 409 status code indicates that the server was unable to complete the request, often because a file would need to be editted, created or deleted, and that file cannot be editted, created or deleted.
410 - Gone
A 410 status code is the 404's lesser known cousin. It indicates that a resource has permanently gone (a 404 status code gives no indication if a resource has gine permanently or temporarily), and no new address is known for it.
411 - Length Required
The 411 status code occurs when a server refuses to process a request because a content length was not specified.
412 - Precondition Failed
A 412 status code indicates that one of the conditions the request was made under has failed.
413 - Request Entity Too Large
The 413 status code indicates that the request was larger than the server is able to handle, either due to physical constraints or to settings. Usually, this occurs when a file is sent using the POST method from a form, and the file is larger than the maximum size allowed in the server settings.
414 - Request-URI Too Long
The 414 status code indicates the the URL requested by the client was longer than it can process.
415 - Unsupported Media Type
A 415 status code is returned by a server to indicate that part of the request was in an unsupported format.
416 - Requested Range Not Satisfiable
A 416 status code indicates that the server was unable to fulfill the request. This may be, for example, because the client asked for the 800th-900th bytes of a document, but the document was only 200 bytes long.
417 - Expectation Failed
The 417 status code means that the server was unable to properly complete the request. One of the headers sent to the server, the "Expect" header, indicated an expectation the server could not meet.

Server Error

500 - Internal Server Error
A 500 status code (all too often seen by Perl programmers) indicates that the server encountered something it didn't expect and was unable to complete the request.
501 - Not Implemented
The 501 status code indicates that the server does not support all that is needed for the request to be completed.
502 - Bad Gateway
A 502 status code indicates that a server, while acting as a proxy, received a response from a server further upstream that it judged invalid.
503 - Service Unavailable
A 503 status code is most often seen on extremely busy servers, and it indicates that the server was unable to complete the request due to a server overload.
504 - Gateway Timeout
A 504 status code is returned when a server acting as a proxy has waited too long for a response from a server further upstream.
505 - HTTP Version Not Supported
A 505 status code is returned when the HTTP version indicated in the request is no supported. The response should indicate which HTTP versions are supported.

云自无心水自�?/a> 2010-06-23 07:16 发表评论

java comm操作串口

Fri, 18 Jun 2010 09:06:00 GMT

摘要: 一、往串口写数�?import java.io.*; import javax.comm.*; import java.util.*; public class PortWriter { static Enumeration ports; ... 阅读全文

云自无心水自�?/a> 2010-06-18 17:06 发表评论

在myeclipse8.5中安装反�~�译插�g(java decompiler)

Wed, 16 Jun 2010 22:18:00 GMT

"java decompiler"是一个非常出色的java反编译工��P��详见主页�Q�http://java.decompiler.free.fr/

在myeclipse8.5中的安装也比较简单，下蝲�Q�http://java.decompiler.free.fr/jd-eclipse/update/jdeclipse_update_site.zip
然后把这个压�~�包解开攑֜�myeclipse8.5的dropins目录下，比如�Q�C:\Programs\Genuitec\MyEclipse-8.5\dropins\jdeclipse_update_site
重�vmyeclipse��p��了，�W�一�ơ打开class文�g�Q�可能会�E�微有一�Ҏ(gu��)��Q�要�{�待一��会才会反编译出来�?br />

好像�q�有炚w��?

云自无心水自�?/a> 2010-06-17 06:18 发表评论

Spring Security - Using custom Authentication Processing Filter

Fri, 11 Jun 2010 00:12:00 GMT

Recently I got a chance working with Spring security, formerly known as Acegi Security for spring. While working with the framework, I heard comments from friends and colleagues saying that spring security lacks proper documentation. So thought of sharing a little knowledge. By the way, this is first ever blog posting and kindly excuse me and let me know any errors and improvements. Spring security offers a simple configuration based security for your web applications helping you secure your web application with out littering your business logic with any security code. It provides securing URL's based on the Role (Authorities), securing your business methods based on the ACL's. The first step in hooking up the spring security to your web application is by specifying the DelegatingFilterProxy in your web.xml.

springSecurityFilterChain

org.springframework.web.filter.DelegatingFilterProxy

springSecurityFilterChain

REQUEST INCLUDE FORWARD If you want to externalize all of your security related configuration into a separate file, you can do so and add that to your context location param.

contextConfigLocation

/WEB-INF/beans.xml , /WEB-INF/springSecurity.xml

Now comes the part of security configuration for your application, Adding the URL security patterns is pretty simple and straight forward. Add all the URL patterns which you want to secure and add the wild card pattern at the end. You need to have some default principal and role even for non logged in users as you need to give access to pages like log in, register and forgot password kind of functionality even to non logged in users. I tried to add comments to pretty much every element which I am using here. As an example I added just a wild card intercept url which make every page of my application secure. You need to exclude different urls based on the roles.

Following is my custom implementation of AuthenticationEntryPoint, which currently is not doing any thing except leveraging the commence to its super class which is the spring implementation of AuthenticationProcessingFilterEntryPoint. I hooked it to add any custom logic. public class CustomAuthenticationEntryPoint extends AuthenticationProcessingFilterEntryPoint { private static final Log logger = LogFactory.getLog(CustomAuthenticationEntryPoint.class); @Override public void commence(ServletRequest request, ServletResponse response, AuthenticationException authException) throws IOException, ServletException { super.commence(request, response, authException); } } This is my custom authentication manager which actually does the custom login of the user. It will throw an BadCredentialsException in case of invalid credentials or thorws a AuthenticationServiceException in case of a service error (Database error, SQL error or any other error). public class CustomAuthunticationManager implements AuthenticationManager { @Autowired UserManagerService userManagerService; public Authentication authenticate(Authentication authentication) throws AuthenticationException { if(StringUtils.isBlank((String) authentication.getPrincipal()) || StringUtils.isBlank((String) authentication.getCredentials())){ throw new BadCredentialsException("Invalid username/password"); } User user = null; GrantedAuthority[] grantedAuthorities = null; try{ user = userManagerService.getUser((String) authentication.getPrincipal(), (String) authentication.getCredentials()); } catch(InvalidCredentialsException ex){ throw new BadCredentialsException(ex.getMessage()); } catch(Exception e){ throw new AuthenticationServiceException("Currently we are unable to process your request. Kindly try again later."); } if (user != null) { List roles = user.getAssociatedRoles(); grantedAuthorities = new GrantedAuthority[roles.size()]; for (int i = 0; i < roles.size(); i++) { Role role = roles.get(i); GrantedAuthority authority = new GrantedAuthorityImpl(role.getRoleCode()); grantedAuthorities[i] = authority; } } else{ throw new BadCredentialsException("Invalid username/password"); } return new UsernamePasswordAuthenticationToken(user, authentication.getCredentials(), grantedAuthorities); } } At the client side (jsp), the simple configuration you need to do is post the request to"/j_spring_security_check" with parameters "j_username" and "j_password". That's pretty much all you need to do for enabling spring security to your existing web application. I will try to explain about doing the method security using ACL's and configuring the view using spring security tags in another post.

云自无心水自�?/a> 2010-06-11 08:12 发表评论

Thu, 03 Jun 2010 02:31:00 GMT

作者相信ga版本��会在不久的未来发布�?br /> 所作者透露�Q�在新版本中会增加一个新的组�Ӟ��dynamic.

�q�个�l��g的用途是更换皮肤。在旧版本的tapestry中，�׃��tapestry的模板是一致的�Q�所以要实现换肤相当困难�?br /> 但在新版本中的这个组件比较完��地解决了这个问题�?br /> 作者自我评仯��个组件是令�h�Ȁ动的一个新事物�?br />

云自无心水自�?/a> 2010-06-03 10:31 发表评论

iBatis已经更名为MyBatis�Q��ƈ搬迁到Google Code

Mon, 24 May 2010 11:58:00 GMT

现在打开iBatis的主��：ibatis.apache.org会发��C��者发布了一个新��L��者说是声明�?br />
大意是因为各�U�原因，已经把iBatis更名为MyBatis, �q�且搬迁到Google Code中了�?br />
新的主页地址是： http://www.mybatis.org

另外�Q�MyBatis3.0.1的正式版已经�?a >http://code.google.com/p/mybatis/可以下蝲了�?br />

云自无心水自�?/a> 2010-05-24 19:58 发表评论