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David1228 — Wed, 30 Oct 2019 06:10:00 GMT

blogjava�|�站与博客园合�ƈ了，对blogjava�q�是有感情的�?br />�q�且blogjava�|�站发布的文章是在博客园首页看不到的�?br />blogjava�|�站首页能看刎ͼ�你可以点��L��题进入可以看到图片二�l�码信息�?br />
Java爱好者社�?/strong>
公众号内容简介：
专注于分享Java后端相关技术、老司机实战干货，不限于JVM、�ƈ发、设计模式、性能优化、分布式&微服务、云原生、大数据相关主题�?/span>
希望��x��的你停下脚步�Q�定有所收获�?/span>

以前的个人博客内容不好迁�U�，所以我打算�Ҏ��自己的多�q�经验，不断整理输出有�h值的内容�?br />目前公众号内�Ҏ��关于SpringCloud�Q�微服务框架�Q�、Skywalking�Q�APM监控调用链）、JVM�Q�GC分析、内存泄漏分析）、�ƈ发编�E?/span>相关原创实战文章已出炉�?br />
最�q�刚开始已�l�有不少��伙伴关注了�Q�期待能有幸搜烦到本博客的同学，可以扫码��x��一下，不胜感激�?br />大家有�Q何技术、职场、面试上的问题都可以与我交流�?br />
方式一�Q?/strong>扫码以下公众号二�l�码�Q?/strong>

方式二：在微信上直接搜烦�Q?nbsp;javatech_cbo

感谢各位��伙伴的支持�Q�后�l�会在该公众号上输出大量的有价值的实战�q�货 �Q�期待与你一同进步与成长�?br />

David1228 2019-10-30 14:10 发表评论

Elasticsearch服务重启故障解决�q�程

David1228 — Mon, 24 Jul 2017 11:10:00 GMT
     摘要:   阅读全文

David1228 2017-07-24 19:10 发表评论

JAVA应用CPU占用100%|内存泄漏分析�ȝ��

David1228 — Thu, 22 Dec 2016 15:01:00 GMT
     摘要:   阅读全文

David1228 2016-12-22 23:01 发表评论

CPU利用�?00%定位�q�程

David1228 — Fri, 04 Nov 2016 15:44:00 GMT
     摘要:   阅读全文

David1228 2016-11-04 23:44 发表评论

[转] JVM调优�ȝ�� + jstat 分析

David1228 — Sun, 03 Jan 2016 15:26:00 GMT
     摘要: JVM调优�ȝ�� + jstat 分析jstat -gccause pid 1 每格1毫秒输出�l�果jstat -gccause pid 2000 每格2�U�输出结果不断的在屏�q�打印出�l�果  S0     S1     E     &n...  阅读全文

David1228 2016-01-03 23:26 发表评论

Thrift RPC框架介绍

David1228 — Wed, 03 Dec 2014 15:56:00 GMT
     摘要:   阅读全文

David1228 2014-12-03 23:56 发表评论

struts2漏洞版本升��q�程

David1228 — Mon, 14 Oct 2013 01:50:00 GMT
     摘要:   阅读全文

David1228 2013-10-14 09:50 发表评论

目标对象没有实现��M��接口�Q�Spring使用CGLIB库生成目标对象的子类

David1228 — Tue, 05 Mar 2013 06:54:00 GMT
��目�l�内一位同事，在重构代码过�E�中��几个模块的Service层接口去掉后. 修改成了没有实现��M��接口的类�Q��ƈ且��承了一个抽象基�c�R�?br />然后我更��C��码后执行�pȝ��中的该模块，发现部分表数据没有完整持久到数据库中。看了下代码和spring配置文�g�Q�原来调整后的Biz的业务类没有配置事务��D��的�?br />
修改了下spring配置文�g�Q�beanNames�l�定�?Biz�Q?
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
    <bean id= "propertyConfigurer"
        class = "com.ccms.base.util.DecryptPropertyPlaceholderConfigurer" >
     <property name="locations" value= "classpath:sysConfig.properties" />
   bean>

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close" >
        <property name="driverClass" value="com.mysql.jdbc.Driver" />
        <property name="jdbcUrl" value="${dataSource.jdbcUrl}&useUnicode=true&characterEncoding=UTF-8" />
        <property name="user" value="${dataSource.userName}" />
        <property name="password" value="${dataSource.password}" />
          <property name="minPoolSize" value="5" />
        <property name="maxPoolSize" value="50" />
        <property name="maxStatements" value="0" />
        <property name="idleConnectionTestPeriod" value="60" />
        <property name="acquireRetryAttempts" value="3" />
    bean>


    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource">
            <ref local="dataSource" />
        property>

        <property name="mappingDirectoryLocations">
            <list>
                <value>classpath:/com/ccms/base/mappingvalue>
            list>
        property>

        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialectprop>
                <prop key="hibernate.show_sql">trueprop>
                <prop key="hibernate.generate_statistics">trueprop>
                <prop key="hibernate.connection.release_mode">autoprop>
                <prop key="hibernate.autoReconnect">trueprop>
                <prop key="hibernate.connection.autocommit">falseprop>

            props>
        property>
    bean>

    <bean id="myTransactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory">
            <ref bean="sessionFactory" />
        property>
    bean>

    <bean id="transactionInterceptor"
        class="org.springframework.transaction.interceptor.TransactionInterceptor">
        <property name="transactionManager" ref="myTransactionManager" />
        <property name="transactionAttributes">
            <props>
                <prop key="*">PROPAGATION_REQUIRED,-Exceptionprop>
            props>
        property>
    bean>
    <bean  class="org.springframework.transaction.interceptor.TransactionAttributeSourceAdvisor">
        <property name="transactionInterceptor"
            ref="transactionInterceptor" />
    bean>
    <bean
        class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
        <property name="beanNames">
            <list>
                <value>*Servicevalue>
                <value>*Bizvalue>
            list>
        property>
        <property name="interceptorNames">
            <list>
                <value>transactionInterceptorvalue>
            list>
        property>
    bean>
beans>

启动tomcat后报出如下错误信息：
[2013-03-05 10:36:56] [ERROR] Context initialization failed - at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:215)
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loginBiz' defined in ServletContext resource [/WEB-INF/spring-service-resource.xml]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.ccms.login.LoginBiz]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:445)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:383)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:353)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:245)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:169)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:242)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:400)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:736)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:369)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:261)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4135)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.ccms.login.LoginBiz]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:213)
at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:110)
at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:433)
at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:299)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:331)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1266)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:438)
... 28 more
Caused by: java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at net.sf.cglib.proxy.Enhancer.emitConstructors(Enhancer.java:718)
at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:499)
at net.sf.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33)
at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:285)
at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:201)
... 34 more
2013-3-5 10:36:56 org.apache.catalina.core.StandardContext listenerStart
严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loginBiz' defined in ServletContext resource [/WEB-INF/spring-service-resource.xml]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.ccms.login.LoginBiz]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:445)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:383)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:353)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:245)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:169)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:242)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:400)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:736)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:369)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:261)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4135)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.ccms.login.LoginBiz]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:213)
at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:110)
at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:433)
at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:299)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:331)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1266)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:438)
... 28 more
Caused by: java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given
at net.sf.cglib.proxy.Enhancer.emitConstructors(Enhancer.java:718)
at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:499)
at net.sf.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33)
at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:285)
at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:201)
... 34 more
2013-3-5 10:36:56 org.apache.catalina.core.StandardContext start

------------------------------------------
通过以上错误分析之：对于实现了接口的�c�，直接用了JDK的动态代理，把目标对象扔�l�JDK的Proxy�Q�拿��C��理对象就OK了�?/span>然而对于没有实现接口的�c�，Spring借助于CGLIB来实��C��理�?br />解决办法�Q?br />当��用CGLIB来实��C��理后�Q�没有实现接口的�c?br />1�?通过构造函数�Ş式注入时必须有默认的构造函敎ͼ�否则��׃��出现上面的异常�?br />2、通过生��setter或者getter�Ҏ��注入�?br />3、通过修改Spring�?span style="font-family: Monaco, 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', Consolas, 'Courier New', monospace; font-size: 12px; line-height: 18px; background-color: #fafafa;">CglibProxyFactory工厂�c�R�?br />
详细解析可以参照�q�篇文章�Q?a >http://netfork.iteye.com/blog/286215

David1228 2013-03-05 14:54 发表评论

David1228 — Fri, 21 Jan 2011 04:01:00 GMT

package com.sinovatech.unicom.efb.common;

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.net.SocketException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;

/**
*
* 目的:FTP文�g�c?br /> *

*
* FTP上传文�g、下载文�?br /> *
* *
*/
public class FTPUtil {
private static final Log log = LogFactory.getLog(FTPUtil.class);

public static int download(String ip,int port,String userName,String password,FileFilter filter,String localFilePath) throws SocketException, IOException{
  return download(ip, port, userName, password, null,filter, localFilePath);
}

public static int download(String ip,int port,String userName,String password,String ftpPath,FileFilter filter,String localFilePath) throws SocketException, IOException{
  FTPClient ftp = new FTPClient();
  int i=0;
   try {
    // 不�ؓ�I��?通过IP 和端�?br />     ftp.connect(ip, port);
    // 登陆
    if (ftp.login(userName, password)) {
     ftp.enterLocalPassiveMode();
     // 获取FTP登陆目录下的所有文�?br />      if(ftpPath!=null){
      if(!ftp.changeWorkingDirectory(ftpPath)){
       throw new RuntimeException("找不到该目录:"+ftpPath);
      }
     }
     FTPFile[] files = ftp.listFiles();
     for (FTPFile file : files) {
      String fileName = file.getName();
      if (filter.accept(fileName)) {
       BufferedOutputStream out = null;
       try {
        // IO��下载文件到本地
        out = new BufferedOutputStream(
          new FileOutputStream(new File(localFilePath
            ,fileName)));
        // 开始下�?br />         ftp.retrieveFile(file.getName(), out);
        log.info("下蝲文�g:" + file.getName() + "到本地�\�?"
          + localFilePath);
        i++;
       } finally {
        try {
         if (out != null) {
          out.close();
         }
        } catch (Exception e) {
         log.error("", e);
        }
       }
      }
     }
    } else {
     i = -1;
    }
   } finally {
    if(ftp != null&&ftp.isConnected()){
     try {
      log.info("关闭ftp�q�接");
      ftp.disconnect();
     } catch (IOException e) {
      e.printStackTrace();
     }
    }
   }
  return i;
}

public static int download(String ip,int port,String userName,String password,String ftpPath,final String fileName,String localFilePath)throws SocketException, IOException{


  return download(ip, port, userName, password,ftpPath,new FileFilter(){

    public boolean accept(String fileName1) {

     return fileName.equalsIgnoreCase(fileName1);
    }

   }, localFilePath);

}

public static int download(String ip,int port,String userName,String password,final String fileName,String localFilePath)throws SocketException, IOException{
  return download(ip, port, userName, password,null,fileName, localFilePath);
}

/**
* ftp上传文�g��x��务器
* @throws SocketException
* @throws IOException
*/
public static void uploadFile(String ip, int port, String userName, String password, String localFile)
       throws SocketException, IOException{
  log.info("上传本地文�g: " + localFile);
  File file = new File(localFile);
  InputStream in = null;
  FTPClient ftpClient = null;
  if(file != null){
   try {
    ftpClient = new FTPClient();
    in = new FileInputStream(file);
    ftpClient.connect(ip,port);
    if(ftpClient.login(userName, password)){
     ftpClient.enterLocalPassiveMode();
     boolean flag= ftpClient.appendFile(file.getName(), in);
     log.info("上传文�g成功:" + flag);
    }
   }catch (SocketException e) {
    log.error("ftp上传文�g��p�|:", e);
    throw e;
   }catch (IOException e) {
    log.error("ftp上传文�g��p�|:", e);
    throw e;
   } finally{
    if(in != null){
     try {
      in.close();
     } catch (IOException e) {
      e.printStackTrace();
     }
    }
    if(ftpClient != null){
     try {
      ftpClient.disconnect();
     } catch (IOException e) {
      e.printStackTrace();
     }
    }
   }
  }
}

public static void upload(String ip, int port, String userName, String password, String path,String remotePath)
throws SocketException, IOException{
  upload(ip, port, userName, password, new File(path), remotePath);
}

/**
* ftp上传文�g��x��务器
* @throws SocketException
* @throws IOException
*/
public static void upload(String ip, int port, String userName, String password, File localFile,String remotePath)
       throws SocketException, IOException{
  log.info("上传本地文�g: " + localFile.getName());
  InputStream in = null;
  FTPClient ftpClient = null;
  if(localFile != null){
   try {
    ftpClient = new FTPClient();
    in = new FileInputStream(localFile);
    ftpClient.connect(ip,port);
    if(ftpClient.login(userName, password)){
     ftpClient.enterLocalPassiveMode();
     if(remotePath!=null){
      if(!ftpClient.changeWorkingDirectory(remotePath)){
       ftpClient.makeDirectory(remotePath);
       ftpClient.changeWorkingDirectory(remotePath);
      }
     }
     boolean flag= ftpClient.storeFile(localFile.getName(), in);
     log.info("上传文�g成功:" + flag);
    }
   }catch (SocketException e) {
    log.error("ftp上传文�g��p�|:", e);
    throw e;
   }catch (IOException e) {
    log.error("ftp上传文�g��p�|:", e);
    throw e;
   } finally{
    if(in != null){
     try {
      in.close();
     } catch (IOException e) {
      e.printStackTrace();
     }
    }
    if(ftpClient != null){
     try {
      ftpClient.disconnect();
     } catch (IOException e) {
      e.printStackTrace();
     }
    }
   }
  }
}

}

David1228 2011-01-21 12:01 发表评论