运用spring注解实现netty服务器端udp应用程序

qq1013712290

浏览: 218479 次
性别:
来自: 广州

最近访客更多访客>>

u012363178

devcang

itace

mjm13

博主相关

博客

微博

相册

留言

关于我

文章分类

社区版块

存档分类

博客分类：

非阻塞io

netty是JBOSS针对网络开发的一套应用框架，它也是在NIO的基础上发展起来的。netty基于异步的事件驱动，具有高性能、高扩展性等特性，它提供了统一的底层协议接口，使得开发者从底层的网络协议（比如 TCP/IP、UDP）中解脱出来。就使用来说，开发者只要参考 Netty提供的若干例子和它的指南文档，就可以放手开发基于Netty的服务端程序了。

netty有几个比较重要的概念，在此，仅做介绍，详细可以参考netty文档或源码。

1). channelBuffer：是 Netty 的一个基本数据结构，这个数据结构存储了一个字节序列。类似于 NIO 的 ByteBuffer，但操作起来比ByteBuffer更为简单方便。

2). ChannelFactory 是一个创建和管理 Channel 通道及其相关资源的工厂接口，它处理所有的 I/O 请求并产生相应的 I/O ChannelEvent 通道事件。

3).ChannelHandler是所有I/O ChannelEvent事件的响应类，所有消息，包括netty通信异常事件，均在该响应类内处理。

4).*** Bootstrap 是一个设置服务的帮助类。你甚至可以在这个服务中直接设置一个 Channel 通道。

现在以实现一个UDP协议下的服务器应用程序为例，演示netty通过spring注解开发服务器端。（在此以maven工具管理项目开发）

首先，是导入关联jar的POM文件：

[xhtml] view plain copy print ?

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.byd.example</groupId>
<artifactId>nettyTest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>nettyTest</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>slf4j</groupId>
<artifactId>slf4j-jdk14</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.9</version>
</dependency>
<dependency>
<groupId>org.jboss.netty</groupId>
<artifactId>netty</artifactId>
<version>3.2.0.BETA1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>3.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>3.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>3.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>3.0.2.RELEASE</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>repository.jboss.org</id>
<url>http://repository.jboss.org/nexus/content/groups/public/</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
<build>
</build>
</project>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.byd.example</groupId> <artifactId>nettyTest</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>nettyTest</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <dependency> <groupId>slf4j</groupId> <artifactId>slf4j-jdk14</artifactId> <version>1.6.1</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.9</version> </dependency> <dependency> <groupId>org.jboss.netty</groupId> <artifactId>netty</artifactId> <version>3.2.0.BETA1</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>3.0.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-expression</artifactId> <version>3.0.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>3.0.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>3.0.2.RELEASE</version> </dependency> </dependencies> <repositories> <repository> <id>repository.jboss.org</id> <url>http://repository.jboss.org/nexus/content/groups/public/</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> <build> </build> </project>

接下来是应用程序代码，在本人机器上可以运行并正常工作，如有需要可以试试。

I、Server接口：

[java] view plain copy print ?

package com.byd.example.netty;
public interface IServer
{
/**
* 启动服务器
*/
public void start();
/**
* 重启程序
*/
public void restart();
/**
* 停止程序运行
*/
public void stop();
}

package com.byd.example.netty; public interface IServer { /** * 启动服务器 */ public void start(); /** * 重启程序 */ public void restart(); /** * 停止程序运行 */ public void stop(); }

II、ChannelHandler扩张类（继承SimpleChannelHandler）：

[java] view plain copy print ?

package com.byd.example.netty;
import java.util.Random;
import org.apache.log4j.Logger;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.DynamicChannelBuffer;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
import org.springframework.stereotype.Component;
@Component("receiverHandler")
public class ReceiverHandler extends SimpleChannelHandler
{
private static final Logger logger=Logger.getLogger(ReceiverHandler.class.getName());
@Override
public void messageReceived(ChannelHandlerContext ctx,MessageEvent e) throws Exception
{
ChannelBuffer buffer=(ChannelBuffer)e.getMessage();
byte[] recByte=buffer.copy().toByteBuffer().array();
String recMsg=new String(recByte);
logger.info("server received:"+recMsg.trim());
Random random=new Random();
int backWord=random.nextInt(10000);
ChannelBuffer responseBuffer=new DynamicChannelBuffer(4);
responseBuffer.readBytes(backWord);
e.getChannel().write(responseBuffer);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx,ExceptionEvent e)
{
logger.error(e.getCause());
if(e.getChannel() !=null)
{
e.getChannel().close().addListener(ChannelFutureListener.CLOSE);
}
}
}

package com.byd.example.netty; import java.util.Random; import org.apache.log4j.Logger; import org.jboss.netty.buffer.ChannelBuffer; import org.jboss.netty.buffer.DynamicChannelBuffer; import org.jboss.netty.channel.ChannelFutureListener; import org.jboss.netty.channel.ChannelHandlerContext; import org.jboss.netty.channel.ExceptionEvent; import org.jboss.netty.channel.MessageEvent; import org.jboss.netty.channel.SimpleChannelHandler; import org.springframework.stereotype.Component; @Component("receiverHandler") public class ReceiverHandler extends SimpleChannelHandler { private static final Logger logger=Logger.getLogger(ReceiverHandler.class.getName()); @Override public void messageReceived(ChannelHandlerContext ctx,MessageEvent e) throws Exception { ChannelBuffer buffer=(ChannelBuffer)e.getMessage(); byte[] recByte=buffer.copy().toByteBuffer().array(); String recMsg=new String(recByte); logger.info("server received:"+recMsg.trim()); Random random=new Random(); int backWord=random.nextInt(10000); ChannelBuffer responseBuffer=new DynamicChannelBuffer(4); responseBuffer.readBytes(backWord); e.getChannel().write(responseBuffer); } @Override public void exceptionCaught(ChannelHandlerContext ctx,ExceptionEvent e) { logger.error(e.getCause()); if(e.getChannel() !=null) { e.getChannel().close().addListener(ChannelFutureListener.CLOSE); } } }

III、ChannelPipelineFactory实现类，包装ChannelHandler，处理I/O事件。

[java] view plain copy print ?

package com.byd.example.netty;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;
@Component("serverChannelPipelineFactory")
public class ServerChannelPipelineFactory implements ChannelPipelineFactory
{
@Autowired
@Qualifier("receiverHandler")
private ReceiverHandler handler;
@Override
public ChannelPipeline getPipeline() throws Exception
{
ChannelPipeline pipeline=Channels.pipeline();
pipeline.addLast("handler", this.handler);
return pipeline;
}
public void setHandler(ReceiverHandler handler) {
this.handler = handler;
}
}

package com.byd.example.netty; import org.jboss.netty.channel.ChannelPipeline; import org.jboss.netty.channel.ChannelPipelineFactory; import org.jboss.netty.channel.Channels; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.stereotype.Component; @Component("serverChannelPipelineFactory") public class ServerChannelPipelineFactory implements ChannelPipelineFactory { @Autowired @Qualifier("receiverHandler") private ReceiverHandler handler; @Override public ChannelPipeline getPipeline() throws Exception { ChannelPipeline pipeline=Channels.pipeline(); pipeline.addLast("handler", this.handler); return pipeline; } public void setHandler(ReceiverHandler handler) { this.handler = handler; } }

IV、Iserver接口的实现类。

[java] view plain copy print ?

package com.byd.example.netty;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.concurrent.Executors;
import org.apache.log4j.Logger;
import org.jboss.netty.bootstrap.ConnectionlessBootstrap;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.channel.socket.DatagramChannelFactory;
import org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;
@Component("serverNettyImpl")
public class ServerNettyImpl implements IServer {
@Autowired
@Qualifier("serverChannelPipelineFactory")
private ServerChannelPipelineFactory pipelineFactory;
private Channel channel;
private static final Logger logger = Logger.getLogger(ServerNettyImpl.class
.getName());
@Override
public void start() {
DatagramChannelFactory udpChannelFactory = new NioDatagramChannelFactory(
Executors.newCachedThreadPool());
ConnectionlessBootstrap bootstrap = new ConnectionlessBootstrap(udpChannelFactory);
bootstrap.setOption("reuseAddress", false);
bootstrap.setOption("child.reuseAddress", false);
bootstrap.setOption("readBufferSize", 1024);
bootstrap.setOption("writeBufferSize", 1024);
bootstrap.setPipelineFactory(this.pipelineFactory);
SocketAddress serverAddress = new InetSocketAddress(5000);
this.channel = bootstrap.bind(serverAddress);
logger.info("server start on " + serverAddress);
}
@Override
public void restart() {
this.stop();
this.start();
}
@Override
public void stop() {
if (this.channel != null) {
this.channel.close().addListener(ChannelFutureListener.CLOSE);
}
}
}

package com.byd.example.netty; import java.net.InetSocketAddress; import java.net.SocketAddress; import java.util.concurrent.Executors; import org.apache.log4j.Logger; import org.jboss.netty.bootstrap.ConnectionlessBootstrap; import org.jboss.netty.channel.Channel; import org.jboss.netty.channel.ChannelFutureListener; import org.jboss.netty.channel.socket.DatagramChannelFactory; import org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.stereotype.Component; @Component("serverNettyImpl") public class ServerNettyImpl implements IServer { @Autowired @Qualifier("serverChannelPipelineFactory") private ServerChannelPipelineFactory pipelineFactory; private Channel channel; private static final Logger logger = Logger.getLogger(ServerNettyImpl.class .getName()); @Override public void start() { DatagramChannelFactory udpChannelFactory = new NioDatagramChannelFactory( Executors.newCachedThreadPool()); ConnectionlessBootstrap bootstrap = new ConnectionlessBootstrap(udpChannelFactory); bootstrap.setOption("reuseAddress", false); bootstrap.setOption("child.reuseAddress", false); bootstrap.setOption("readBufferSize", 1024); bootstrap.setOption("writeBufferSize", 1024); bootstrap.setPipelineFactory(this.pipelineFactory); SocketAddress serverAddress = new InetSocketAddress(5000); this.channel = bootstrap.bind(serverAddress); logger.info("server start on " + serverAddress); } @Override public void restart() { this.stop(); this.start(); } @Override public void stop() { if (this.channel != null) { this.channel.close().addListener(ChannelFutureListener.CLOSE); } } }

V、应用程序入口：

[java] view plain copy print ?

package com.byd.example;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.byd.example.netty.IServer;
public class NettyTestRun
{
public static void main( String[] args )
{
ApplicationContext context=new ClassPathXmlApplicationContext("classpath*:nettyTest-context.xml");
IServer server=(IServer)context.getBean("serverNettyImpl");
server.start();
}
}

package com.byd.example; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.byd.example.netty.IServer; public class NettyTestRun { public static void main( String[] args ) { ApplicationContext context=new ClassPathXmlApplicationContext("classpath*:nettyTest-context.xml"); IServer server=(IServer)context.getBean("serverNettyImpl"); server.start(); } }

VI、context配置文件：

[xhtml] view plain copy print ?

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="com.byd.example"/>
<context:annotation-config/>
</beans>

<?xml version="1.0" encoding="UTF-8" ?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:component-scan base-package="com.byd.example"/> <context:annotation-config/> </beans>

VII、日志配置文件：

[xhtml] view plain copy print ?

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd" >
<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/' >
<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
<param name="target" value="System.out"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss}-%m%n" />
</layout>
<filter class="org.apache.log4j.varia.LevelRangeFilter">
<param name="levelMin" value="debug" />
<param name="levelMax" value="warn" />
<param name="AcceptOnMatch" value="true" />
</filter>
</appender>
<appender name="FILE" class="org.apache.log4j.RollingFileAppender">
<param name="File" value="./target/output.log" />
<param name="Append" value="true" />
<param name="MaxBackupIndex" value="10" />
<param name="encoding" value="UTF-8"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss}-%m%n" />
</layout>
</appender>
<appender name="activexAppender" class="org.apache.log4j.DailyRollingFileAppender">
<param name="File" value="./target/activex.log" />
<param name="DatePattern" value="'.'yyyy-MM-dd'.log'" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss}-%m%n" />
</layout>
</appender>
<!--
<logger name="com.runway.bssp.activeXdemo" additivity="false">
<priority value ="info"/>
<param name="Level" value="DEBUG"/>
<appender-ref ref="activexAppender" />
</logger> -->
<root>
<priority value ="debug"/>
<appender-ref ref="CONSOLE"/>
<appender-ref ref="FILE"/>
</root>
</log4j:configuration>

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd" > <log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/' > <appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender"> <param name="target" value="System.out"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss}-%m%n" /> </layout>  <filter class="org.apache.log4j.varia.LevelRangeFilter"> <param name="levelMin" value="debug" /> <param name="levelMax" value="warn" /> <param name="AcceptOnMatch" value="true" /> </filter> </appender> <appender name="FILE" class="org.apache.log4j.RollingFileAppender">  <param name="File" value="./target/output.log" />  <param name="Append" value="true" /> <param name="MaxBackupIndex" value="10" /> <param name="encoding" value="UTF-8"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss}-%m%n" /> </layout> </appender> <appender name="activexAppender" class="org.apache.log4j.DailyRollingFileAppender"> <param name="File" value="./target/activex.log" /> <param name="DatePattern" value="'.'yyyy-MM-dd'.log'" /> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss}-%m%n" /> </layout> </appender>   <root> <priority value ="debug"/> <appender-ref ref="CONSOLE"/> <appender-ref ref="FILE"/> </root> </log4j:configuration>

整理上面的代码，运行起来，可以看到服务器侦听在5000端口并接受客户端的信息并返回一个int随机数。

后记：netty当然也可以应用在TCP和客户端的程序，具体的使用可以参考netty API文档。

分享到：

java开发之netty里集成spring注入mysq连接 ... | java开发之netty里集成spring注入mysq连接 ...

2014-11-09 13:04
浏览 2497
评论(0)
分类:编程语言
查看更多

发表评论

您还没有登录,请您登录后再发表评论

最近访客更多访客>>

博主相关

文章分类

社区版块

存档分类

最新评论