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ResourceBundle ��d��properties文�g中文��q��

叶落心成 — Mon, 07 Jul 2014 03:31:00 GMT

1.��认properties文�g是什么编码格式，�q�确认文件在该格式下中文是正常显�C�的
2.��d��时候，�q�行转一层，先用ISO-8859-1��d��字节��，然后�Ҏ��properties的文件格式进行new String(byte,"文�g�~�码格式");

new String(bundle.getString("BOC_ACTNAME").getBytes("ISO-8859-1"),"UTF-8");

叶落心成 2014-07-07 11:31 发表评论

Java�E�序执行��时——Future接口介绍

叶落心成 — Tue, 04 Mar 2014 03:48:00 GMT

在Java中，如果需要设定代码执行的最长时��_��卌��Ӟ��可以用Java�U�程池ExecutorService�c�配合Future接口来实现�?Future接口是Java标准API的一部分�Q�在java.util.concurrent包中。Future接口是Java�U�程Future模式的实玎ͼ�可以来进行异步计��?/p>

Future模式可以�q�样来描�q�ͼ�我有一个�Q务，提交�l�了Future�Q�Future替我完成�q�个��d��。期间我自己可以��d��M��惛_��的事情。一�D�|�� 间之后，我就便可以从Future那儿取出�l�果。就相当于下了一张订货单�Q�一�D�|��间后可以拿着提订单来提货�Q�这期间可以�q�别的�Q何事情。其中Future 接口��是订货单，真正处理订单的是Executor�c�，它根据Future接口的要求来生��产品�?/p>

Future接口提供�Ҏ��来检��Q务是否被执行完，�{�待��d��执行完获得结果，也可以设�|��Q务执行的��时旉��。这个设�|�超时的�Ҏ��是实现Java�E?序执行超时的关键�?/p>

Future接口是一个泛型接口，严格的格式应该是Future�Q�其中V代表了Future执行的�Q务返回值的�c�d��?Future接口的方法介�l�如下：

boolean cancel (boolean mayInterruptIfRunning) 取消��d��的执行。参数指定是否立即中断�Q务执行，或者等�{��Q务结�?/li>
boolean isCancelled () ��d��是否已经取消�Q��Q务正常完成前��其取消�Q�则�q�回 true
boolean isDone () ��d��是否已经完成。需要注意的是如果�Q务正常终止、异常或取消�Q�都��返回true
V get () throws InterruptedException, ExecutionException �{�待��d��执行�l�束�Q�然后获得V�c�d��的结果。InterruptedException �U�程被中断异常， ExecutionException��d��执行异常�Q�如果�Q务被取消�Q�还会抛�?code style="font-family: 'Courier New', Courier, monospace; font-size: 1em; white-space: pre;">CancellationException
V get (long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException 同上面的get功能一��P��多了讄��时旉��。参数timeout指定��时旉��Q�uint指定旉��的单位，在枚丄��TimeUnit中有相关的定义。如果计 ��超�Ӟ��抛出TimeoutException

Future的实现类有java.util.concurrent.FutureTask�?javax.swing.SwingWorker。通常使用FutureTask来处理我们的��d��。FutureTask�c�d��时又实现了Runnable接口�Q�所以可以直接提交给Executor执行。��用FutureTask实现��时执行的代码如下：

Java代码  
ExecutorService executor = Executors.newSingleThreadExecutor();  
FutureTask future =  
       new FutureTask(new Callable() {//使用Callable接口作�ؓ构造参�?/span>  
         public String call() {  
           //真正的�Q务在�q�里执行�Q�这里的�q�回值类型�ؓString�Q�可以�ؓ��L���c�d��  
       }});  
executor.execute(future);  
//在这里可以做别的��M��事情  
try {  
    result = future.get(5000, TimeUnit.MILLISECONDS); //取得�l�果�Q�同时设�|�超时执行时间�ؓ5�U�。同样可以用future.get()�Q�不讄���执行���时旉���取得�l�果  
} catch (InterruptedException e) {  
    futureTask.cancel(true);  
} catch (ExecutionException e) {  
    futureTask.cancel(true);  
} catch (TimeoutException e) {  
    futureTask.cancel(true);  
} finally {  
    executor.shutdown();  
}  

不直接构造Future对象�Q�也可以使用ExecutorService.submit�Ҏ��来获得Future对象�Q�submit�Ҏ��x��持以 Callable接口�c�d��Q�也支持Runnable接口作�ؓ参数�Q�具有很大的灉|��性。��用示例如下：

Java代码  
ExecutorService executor = Executors.newSingleThreadExecutor();  
FutureTask future =　executor.submit(  
   new Callable() {//使用Callable接口作�ؓ构造参�?/span>  
       public String call() {  
      //真正的�Q务在�q�里执行�Q�这里的�q�回值类型�ؓString�Q�可以�ؓ��L���c�d��  
   }});  
//在这里可以做别的��M��事情  
//同上面取得结果的代码  

利用Future接口实现�E�序执行��时大致用法��p��么多�Q�改天需要研�I�下Future接口的内部实玎ͼ�特别是设定执行超时的实现�?/p>

叶落心成 2014-03-04 11:48 发表评论

fastjson

叶落心成 — Mon, 06 Jan 2014 09:07:00 GMT

FastJSON是一个很好的java开源json工具�c�d��Q�相比其他同�cȝ��json�c�d��Q�它的速度的确是fast�Q�最快！但是文��做得不好�Q�在应用前不得不亲测一些功能�?/div>

实际上其他的json处理工具都和它差不多�Q�api也有几分�怼��?/div>

一、JSON规范

JSON是一个标准规范，用于数据交互�Q�规范的中文文��如下�Q?/div>

http://www.json.org/json-zh.html

参看规范�Q�来�Ҏ��JSON�c�d��处理�l�果�?/div>

二、fastjson的一些简要说�?/div>

1、了解fastjson

Fastjson介绍

Fastjson是一个Java语言�~�写的JSON处理器�?br />1、遵�?a rel="nofollow" style="color: #336699; text-decoration: none;">http://json.org标准�Q��ؓ其官方网站收录的参考实��C��一�?br />2、功能qiang打，支持JDK的各�U�类型，包括基本的JavaBean、Collection、Map、Date、Enum、泛型�?br />3、无依赖�Q�不需要例外额外的jar�Q�能够直接跑在JDK上�?br />4、开源，使用Apache License 2.0协议开源�?a rel="nofollow" style="color: #336699; text-decoration: none;">http://code.alibabatech.com/wiki/display/FastJSON/Home

如果获得Fastjson�Q?br />SVN:http://code.alibabatech.com/svn/fastjson/trunk/
WIKI:http://code.alibabatech.com/wiki/display/FastJSON/Home
Issue Tracking:http://code.alibabatech.com/jira/browse/FASTJSON

2、主要的使用入口

Fastjson API入口�c�L��com.alibaba.fastjson.JSON�Q�常用的序列化操作都可以在JSON�c�M��的静态方法直接完成�?/div>

public static final Object parse(String text); // 把JSON文本parse为JSONObject或者JSONArray
public static final JSONObject parseObject(String text)�Q?nbsp;// 把JSON文本parse成JSONObject
public static final T parseObject(String text, Class clazz); // 把JSON文本parse为JavaBean
public static final JSONArray parseArray(String text); // 把JSON文本parse成JSONArray
public static final List parseArray(String text, Class clazz); //把JSON文本parse成JavaBean集合
public static final String toJSONString(Object object); // ��JavaBean序列化�ؓJSON文本
public static final String toJSONString(Object object, boolean prettyFormat); // ��JavaBean序列化�ؓ带格式的JSON文本
public static final Object toJSON(Object javaObject); ��JavaBean转换为JSONObject或者JSONArray�?/div>

3、有关类库的一些说�?/div>

SerializeWriter�Q�相当于StringBuffer

JSONArray�Q�相当于List

JSONObject�Q�相当于Map

JSON反序列化没有真正数组�Q�本质类型都是List

4、fastjson�q�有很多很高�U�的�Ҏ��，比如支持注解、支持全�c�d��序列化，�q�些都是很好的特性，功能强大�Q�不在本�ơ测试范围�?/div>

三、测试代�?/div>

package lavasoft.stu.json;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializeConfig;
import com.alibaba.fastjson.serializer.SimpleDateFormatSerializer;

import java.util.*;

/**
* Created by IntelliJ IDEA.
*
* @author leizhimin 11-11-22 上午9:15
*/
public class Foo {
        private String vString = "vStringhehhehe";
        private char vchar = 'x';

        private byte vbyte = 64;
        private short vshort = 128;
        private int vint = 65535;
        private long vlong = 9999999L;

        private float vfloat = 12.1f;
        private double vdouble = 22.203d;

        private boolean vboolean = false;

//        private Date vdate = new Date();
        private Date dddd = new Date();
        private Date vDate = new Date();
        private Date v_Date = new Date();
        private Object vnull = null;

        private String[] avString = {"aaa", "bbb", "ccc"};
        private int[] avint = {1, 2, 3, 4};
        private boolean[] avboolean = {true, false, true, true};

        private List listString = new ArrayList();
        private Map map = new HashMap();

        private Bar bar = new Bar();
        private Bar[] avBar = {new Bar(), new Bar()};
        private List listBar = new ArrayList();

        {
                listString.add("listString1");
                listString.add("listString2");
                listString.add("listString3");

                map.put("x", "s11111x");
                map.put("y", "s22222y");
                map.put("z", "s33333z");

                listBar.add(new Bar());
                listBar.add(new Bar());
                listBar.add(new Bar());
        }

        public String getvString() {
                return vString;
        }

        public void setvString(String vString) {
                this.vString = vString;
        }

        public char getVchar() {
                return vchar;
        }

        public void setVchar(char vchar) {
                this.vchar = vchar;
        }

        public byte getVbyte() {
                return vbyte;
        }

        public void setVbyte(byte vbyte) {
                this.vbyte = vbyte;
        }

        public short getVshort() {
                return vshort;
        }

        public void setVshort(short vshort) {
                this.vshort = vshort;
        }

        public int getVint() {
                return vint;
        }

        public void setVint(int vint) {
                this.vint = vint;
        }

        public long getVlong() {
                return vlong;
        }

        public void setVlong(long vlong) {
                this.vlong = vlong;
        }

        public float getVfloat() {
                return vfloat;
        }

        public void setVfloat(float vfloat) {
                this.vfloat = vfloat;
        }

        public double getVdouble() {
                return vdouble;
        }

        public void setVdouble(double vdouble) {
                this.vdouble = vdouble;
        }

        public boolean isVboolean() {
                return vboolean;
        }

        public void setVboolean(boolean vboolean) {
                this.vboolean = vboolean;
        }

        public Date getDddd() {
                return dddd;
        }

        public void setDddd(Date dddd) {
                this.dddd = dddd;
        }

        public Date getV_Date() {
                return v_Date;
        }

        public void setV_Date(Date v_Date) {
                this.v_Date = v_Date;
        }

        public Date getvDate() {
                return vDate;
        }

        public void setvDate(Date vDate) {
                this.vDate = vDate;
        }

        public Object getVnull() {
                return vnull;
        }

        public void setVnull(Object vnull) {
                this.vnull = vnull;
        }

        public String[] getAvString() {
                return avString;
        }

        public void setAvString(String[] avString) {
                this.avString = avString;
        }

        public int[] getAvint() {
                return avint;
        }

        public void setAvint(int[] avint) {
                this.avint = avint;
        }

        public boolean[] getAvboolean() {
                return avboolean;
        }

        public void setAvboolean(boolean[] avboolean) {
                this.avboolean = avboolean;
        }

        public List getListString() {
                return listString;
        }

        public void setListString(List listString) {
                this.listString = listString;
        }

        public Map getMap() {
                return map;
        }

        public void setMap(Map map) {
                this.map = map;
        }

        public Bar getBar() {
                return bar;
        }

        public void setBar(Bar bar) {
                this.bar = bar;
        }

        public Bar[] getAvBar() {
                return avBar;
        }

        public void setAvBar(Bar[] avBar) {
                this.avBar = avBar;
        }

        public List getListBar() {
                return listBar;
        }

        public void setListBar(List listBar) {
                this.listBar = listBar;
        }
}

package lavasoft.stu.json;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.serializer.SerializeConfig;
import com.alibaba.fastjson.serializer.SimpleDateFormatSerializer;

import java.util.*;

/**
* Created by 2IntelliJ IDEA.
*
* @author leizhimin 11-11-22 上午9:45
*/
public class Test {
        private static SerializeConfig mapping = new SerializeConfig(); static {
                mapping.put(Date.class, new SimpleDateFormatSerializer("yyyy-MM-dd HH:mm:ss"));
        }

        public static void main(String[] args) {
                Foo f1 = new Foo();
                Date date = new Date();
                String text = JSON.toJSONString(date, mapping);
                System.out.println(text);
                System.out.println(JSON.toJSONString(f1, true));
                String x2 =JSON.toJSONString(f1, mapping);
                System.out.println(x2);
        }

        public static void json2List(){
                //List -> JSON array
                List barList = new ArrayList();
                barList.add(new Bar());
                barList.add(new Bar());
                barList.add(new Bar());
                String json= JSON.toJSONString(barList, true);
                System.out.println(json);
                //JSON array -> List
                List barList1 = JSON.parseArray(json,Bar.class);
                for (Bar bar : barList1) {
                        System.out.println(bar.toString());
                }
        }

        public static void json2Map(){
                //Map -> JSON
                Map map = new HashMap();
                map.put("a",new Bar());
                map.put("b",new Bar());
                map.put("c",new Bar());
                String json = JSON.toJSONString(map,true);
                System.out.println(json);
                //JSON -> Map
                Map map1 = (Map)JSON.parse(json);
                for (String key : map1.keySet()) {
                        System.out.println(key+":"+map1.get(key));
                }
        }

        public static void array2JSON(){
                String[] arr_String    = {"a","b","c"};
                String json_arr_String = JSON.toJSONString(arr_String,true);
                System.out.println(json_arr_String);
                JSONArray jsonArray = JSON.parseArray(json_arr_String);
                for (Object o : jsonArray) {
                        System.out.println(o);
                }
                System.out.println(jsonArray);
        }
        public static void array2JSON2(){
                Bar[] arr_Bar    = {new Bar(),new Bar(),new Bar()};
                String json_arr_Bar = JSON.toJSONString(arr_Bar,true);
                System.out.println(json_arr_Bar);
                JSONArray jsonArray = JSON.parseArray(json_arr_Bar);
                for (Object o : jsonArray) {
                        System.out.println(o);
                }
                System.out.println(jsonArray);
        }

        public static void map2JSON(){
                Map map = new HashMap();
                map.put("a","aaa");
                map.put("b","bbb");
                map.put("c","ccc");
                String json=JSON.toJSONString(map);
                System.out.println(json);
                Map map1 = JSON.parseObject(json);
                for (Object o : map.entrySet()) {
                        Map.Entry entry = (Map.Entry)o;
                        System.out.println(entry.getKey()+"--->"+entry.getValue());
                }
        }
}

说明�Q?/div>

SerializeConfig�Q�是对序列化�q�程中一些序列化�q�程的特�D�配�|�，�q�里用作日期格式的定义�?/div>

有关需要带�c�d��的全�c�d��序列化过�E�，需要调用JSON.toJSONStringZ()�Ҏ��?/div>

需要美化输出时候，需要打开序列化美化开养I��在方法中true那个参数�?/div>

输出�l�果�Q?/div>

"2011-11-23 23:30:33"
{
"avBar":[{
    "barAge":174398800,
    "barDate":1322062233062,
    "barName":"sss_0.62378174"
},{
    "barAge":38938962,
    "barDate":1322062233062,
    "barName":"sss_0.36014742"
}],
"avString":["aaa","bbb","ccc"],
"avboolean":[true,false,true,true],
"avint":[1,2,3,4],
"bar":{
    "barAge":1601495948,
    "barDate":1322062233062,
    "barName":"sss_0.46644872"
},
"dddd":1322062233046,
"listBar":[
    {
      "barAge":-1090113522,
      "barDate":1322062233062,
      "barName":"sss_0.83562374"
    },
    {
      "barAge":478603194,
      "barDate":1322062233062,
      "barName":"sss_0.59483266"
    },
    {
      "barAge":1118357669,
      "barDate":1322062233062,
      "barName":"sss_0.9961642"
    }
],
"listString":[
    "listString1",
    "listString2",
    "listString3"
],
"map":{"x":"s11111x","y":"s22222y","z":"s33333z"},
"v_Date":1322062233046,
"vboolean":false,
"vbyte":64,
"vchar":"x",
"vdouble":22.203,
"vfloat":12.1,
"vint":65535,
"vlong":9999999,
"vshort":128
}
{"avBar":[{"barAge":174398800,"barDate":"2011-11-23 23:30:33","barName":"sss_0.62378174"},{"barAge":38938962,"barDate":"2011-11-23 23:30:33","barName":"sss_0.36014742"}],"avString":["aaa","bbb","ccc"],"avboolean":[true,false,true,true],"avint":[1,2,3,4],"bar":{"barAge":1601495948,"barDate":"2011-11-23 23:30:33","barName":"sss_0.46644872"},"dddd":"2011-11-23 23:30:33","listBar":[{"barAge":-1090113522,"barDate":"2011-11-23 23:30:33","barName":"sss_0.83562374"},{"barAge":478603194,"barDate":"2011-11-23 23:30:33","barName":"sss_0.59483266"},{"barAge":1118357669,"barDate":"2011-11-23 23:30:33","barName":"sss_0.9961642"}],"listString":["listString1","listString2","listString3"],"map":{"x":"s11111x","y":"s22222y","z":"s33333z"},"v_Date":"2011-11-23 23:30:33","vboolean":false,"vbyte":64,"vchar":"x","vdouble":22.203,"vfloat":12.1,"vint":65535,"vlong":9999999,"vshort":128}

Process finished with exit code 0

fastjson通过各方面测试都很好�Q�功能性能都是No.1�Q�喜�Ƣ，它的源代码质量很高，作者也煞费苦心�Q�将性能做到了最好，全免��越其他的json�c�d��?/div>

从其中的源代码中�Q�可以学到很多东西，在阅��L��码后�Q�不得不佩服作者高��的�E�序设计水��^�Q�和高质量的�~�码�?/div>

叶落心成 2014-01-06 17:07 发表评论

转蝲 java文�g写入耗时

叶落心成 — Wed, 25 Dec 2013 06:24:00 GMT

转蝲地址:http://zhenqinghualy.blog.163.com/blog/static/5498053520100123332267/
原创地址不详

从老��竹的�|�站上�{来滴

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

/**
* ��试各种写文件的�Ҏ��性能�?nbsp;
*
* @author 老��?JAVA世纪�|?java2000.net)
*
*/
public class T {

public static void main(String[] args) {
    FileOutputStream out = null;
    FileOutputStream outSTr = null;
    BufferedOutputStream Buff = null;
    FileWriter fw = null;
    int count = 1000000;// 写文件行�?nbsp;
    try {
      byte[] bs = "��试java 文�g操作\r\n".getBytes();
      out = new FileOutputStream(new File("C:/add.txt"));
      long begin = System.currentTimeMillis();
      for (int i = 0; i < count; i++) {
        out.write(bs);
      }
      out.close();
      long end = System.currentTimeMillis();
      System.out.println("FileOutputStream执行耗时:" + (end - begin) + " 豪秒");

      outSTr = new FileOutputStream(new File("C:/add0.txt"));
      Buff = new BufferedOutputStream(outSTr);
      long begin0 = System.currentTimeMillis();
      for (int i = 0; i < count; i++) {
        Buff.write(bs);
      }
      Buff.flush();
      Buff.close();
      long end0 = System.currentTimeMillis();
      System.out.println("BufferedOutputStream执行耗时:" + (end0 - begin0) + " 豪秒");

      fw = new FileWriter("C:/add2.txt");
      long begin3 = System.currentTimeMillis();
      for (int i = 0; i < count; i++) {
        fw.write("��试java 文�g操作\r\n");
      }
      fw.flush();
      fw.close();
      long end3 = System.currentTimeMillis();
      System.out.println("FileWriter执行耗时:" + (end3 - begin3) + " 豪秒");

      long begin4 = System.currentTimeMillis();
      String path = "C:/add3.txt";
      ByteBuffer bb = ByteBuffer.wrap(bs);
      FileChannel out2 = new FileOutputStream(path).getChannel();
      for (int i = 0; i < count; i++) {
        out2.write(bb);
        bb.rewind();
      }

      out2.close();
      long end4 = System.currentTimeMillis();
      System.out.println("FileChannel执行耗时:" + (end4 - begin4) + " 豪秒");
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        fw.close();
        Buff.close();
        outSTr.close();
        out.close();
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
}
}

在我的笔记本上，�q�行�l�果如下

FileOutputStream执行耗时:4891 豪秒

BufferedOutputStream执行耗时:78 豪秒

FileWriter执行耗时:438 豪秒

FileChannel执行耗时:2812 豪秒

当然最�l�生成的文�g都是正确�?nbsp;

�ȝ��Q?nbsp;

BufferedOutputStream �׃��有缓�Ԍ��性能明显�?nbsp;

FileOutputStream 性能最差，因�ؓ其每�ơ都写入字节�?nbsp;

FileWriter 性能很一�?nbsp;

FileChannel使用了nio,但如果没有缓�Ԍ��必能太指望性能�?nbsp;

叶落心成 2013-12-25 14:24 发表评论

错误记录�Q�Invalid white space character (0x7)

叶落心成 — Thu, 19 Dec 2013 09:26:00 GMT

今天�q�_��H�然报Invalid white space character (0x7)错误�Q�查了下�Q�是犹��Uaxis2时候传输报文有�Ҏ��字符�Q�但是后��C��用tail -f 命��o�q�行看日志，看不出来有�Q何特�D�字�W�，�U�结个半死，后面�l�同事提醒，使用less命��o来看日志�Q�终于看��Z��Ҏ��字符�?br />

叶落心成 2013-12-19 17:26 发表评论

java环境变量配置

叶落心成 — Tue, 28 Feb 2012 01:54:00 GMT

�Q?�Q�JAVA_HOME C:\Program Files\Java\jdk1.6

�Q?�Q�CLASSPATH �?.;%JAVA_HOME%\lib;%JAVA_HOME%\lib\Tools.jar

(注意�q�里前面�q�有一个小�?.")

如图五所�C?环境变量 CLASSPATH

�Q?�Q�Path 其实Path已经在环境变量里面存在了�q�时候我们只要加上另一个即可在后面加上�Q?Java_Home%\bin
如图六所�C?环境变量 Path

�q�是在安装的时候选择了默认�\径，我们�q�可以在安装的时候修攚w��认�\径，直接安装到ECLipse下面

叶落心成 2012-02-28 09:54 发表评论

java 环境配置

叶落心成 — Tue, 28 Feb 2012 01:53:00 GMT