Apache MINA (2) Hello World!

network

　　了解完Apach MINA的一些基本概念Apache MINA (1) 简介
，开始进入MINA相关的代码学习，以一个简单HelloWorld程序开始，完成客户端与服务端之间的通讯。
　　准备工作：



org.apache.mina 版本4.0

org.slf4j 1.6.1 （Simple Logging Facade for Java）mina所使用的日志框架，该版本是与mina4.0匹配的版本。

我是用maven管理项目依赖的，使用apache-maven-3.0.4

IDE：IntelliJ IDEA 10.0.3
　　开始HelloWorld：


　　1.maven的pom文件：


<?xml version="1.0" encoding="UTF-8"?>
<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>example</groupId>
<artifactId>example</artifactId>
<version>1.0</version>
<properties>
<project.build.sourceEncoding>GBK</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.mina</groupId>
<artifactId>mina-core</artifactId>
<version>2.0.4</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-nop</artifactId>
<version>1.6.1</version>
</dependency>
</dependencies>  
</project>
　　2. 服务器代码：

　　a) 首先实现服务端的IoHandler代码SimpleMinaServerHandler。主要功能是打印客户端写入的信息，统计客户端的请求次数以及返回当前客户端是第几次访问。

package com.chiyan.apach.mina.server;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IoSession;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Created by IntelliJ IDEA.
* 简单的消息处理器
* User: chiyan
* Date: 12-7-19
* Time: 上午12:19
*/
public class SimpleMinaServerHandler extends IoHandlerAdapter {
private AtomicInteger count = new AtomicInteger(0);
/**
* 当一个客户端连接进入时
*/
@Override
public void sessionOpened(IoSession session) throws Exception {
System.out.println("client connection : " + session.getRemoteAddress());
}
/**
* 当一个客户端关闭时
*/
@Override
public void sessionClosed(IoSession session) throws Exception {
System.out.println("client disconnection : " +session.getRemoteAddress() + " is Disconnection");
}
/**
* 当接收到客户端的信息
*
* @param session
* @param message
* @throws Exception
*/
@Override
public void messageReceived(IoSession session, Object message)
throws Exception {
String str = (String)message;
// 打印客户端
System.out.println("receive client message : [ " + str +" ]");
// 回写消息给客户端
session.write(count.incrementAndGet());
}
}
　　b) 搭建服务端 MainServer：

package com.chiyan.apach.mina.server;
import org.apache.mina.core.filterchain.DefaultIoFilterChainBuilder;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.codec.textline.TextLineCodecFactory;
import org.apache.mina.transport.socket.SocketAcceptor;
import org.apache.mina.transport.socket.SocketSessionConfig;
import org.apache.mina.transport.socket.nio.NioSocketAcceptor;
import java.io.IOException;
import java.net.InetSocketAddress;
/**
* Created by IntelliJ IDEA.
* User: chiyan
* Date: 12-7-19
* Time: 上午12:27
*/
public class MainServer {
// 服务器端口
private static final int SERVER_PORT = 8899;
public static void main(String[] args) throws Exception {
//创建一个非阻塞的Server端Socket，用NIO
SocketAcceptor acceptor = new NioSocketAcceptor();
// 定义每次接收数据大小
SocketSessionConfig sessionConfig = acceptor.getSessionConfig();
sessionConfig.setReadBufferSize(2048);
//创建接受数据的过滤器
DefaultIoFilterChainBuilder chain = acceptor.getFilterChain();
//设定这个过滤器将一行一行（/r/n）的读取数据
chain.addLast("myChain", new ProtocolCodecFilter(new TextLineCodecFactory()));
//设定服务器端的消息处理器: 一个 SimpleMinaServerHandler 对象
acceptor.setHandler(new SimpleMinaServerHandler());
//绑定端口，启动服务器
try {
acceptor.bind(new InetSocketAddress(SERVER_PORT));
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("Mina server is listing port:" + SERVER_PORT);
}
}
　　3. 客户端代码

　　a)首先实现客户端的IoHandler代码SimpleMinaClientHandler。主要功能是向服务端写消息，接收到服务端计数后再回写服务端。

package com.chiyan.apach.mina.client;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.session.IoSession;
/**
* Created by IntelliJ IDEA.
* User: chiyan
* Date: 12-7-19
* Time: 上午12:31
*/
public class SimpleMinaClientHandler extends IoHandlerAdapter {
/**
* 当客户端接受到消息时
*/
@Override
public void messageReceived(IoSession session, Object message) throws Exception {
Integer num = Integer.valueOf((String)message);
if(num == null || num >10){
session.close(true);
return;
}
System.out.println("receive server num : [ " + num + " ]");
Thread.sleep(1000);
session.write("client received num is : " + num + ", request next num");
}
/**
* 当一个客户端被关闭时
*/
@Override
public void sessionClosed(IoSession session) throws Exception {
System.out.println("client disconnect");
}
/**
* 当一个客户端连接进入时
*/
@Override
public void sessionOpened(IoSession session) throws Exception {
System.out.println("create connection to server :" + session.getRemoteAddress());
session.write("client started");
session.write("Hello World!");
}
}
　　b)搭建客户端MainClient

package com.chiyan.apach.mina.client;
import org.apache.mina.core.filterchain.DefaultIoFilterChainBuilder;
import org.apache.mina.core.future.ConnectFuture;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.codec.textline.TextLineCodecFactory;
import org.apache.mina.transport.socket.nio.NioSocketConnector;
import java.net.InetSocketAddress;
/**
* Created by IntelliJ IDEA.
* User: chiyan
* Date: 12-7-19
* Time: 上午12:40
*/
public class MainClient {
/**
* 服务器ip
*/
private static final String SERVER_IP="127.0.0.1";
/**
* 服务器端口
*/
private static final int SERVER_PORT=8899;
public static void main(String []args){
//Create TCP/IP connection
NioSocketConnector connector = new NioSocketConnector();
//创建接受数据的过滤器
DefaultIoFilterChainBuilder chain = connector.getFilterChain();
//设定这个过滤器将一行一行(/r/n)的读取数据
chain.addLast("myChain", new ProtocolCodecFilter(new TextLineCodecFactory()));
//服务器的消息处理器：一个 SimpleMinaClientHandler 对象
connector.setHandler(new SimpleMinaClientHandler());
//set connect timeout
connector.setConnectTimeoutMillis(30 * 1000);
//连接到服务器：
ConnectFuture cf = connector.connect(new InetSocketAddress(SERVER_IP,SERVER_PORT));
cf.awaitUninterruptibly();
cf.getSession().getCloseFuture().awaitUninterruptibly();
connector.dispose();
}
}
　　运行程序：


　　1.服务端打印：


Mina server is listing port:8899
client connection : /127.0.0.1:50497
receive client message : [ client started ]
receive client message : [ Hello World! ]
receive client message : [ client received num is : 1, request next num ]
receive client message : [ client received num is : 2, request next num ]
receive client message : [ client received num is : 3, request next num ]
receive client message : [ client received num is : 4, request next num ]
receive client message : [ client received num is : 5, request next num ]
receive client message : [ client received num is : 6, request next num ]
receive client message : [ client received num is : 7, request next num ]
receive client message : [ client received num is : 8, request next num ]
receive client message : [ client received num is : 9, request next num ]
receive client message : [ client received num is : 10, request next num ]
client disconnection : /127.0.0.1:50497 is Disconnection
　　2.客户端打印：


create connection to server :/127.0.0.1:8899
receive server num : [ 1 ]
receive server num : [ 2 ]
receive server num : [ 3 ]
receive server num : [ 4 ]
receive server num : [ 5 ]
receive server num : [ 6 ]
receive server num : [ 7 ]
receive server num : [ 8 ]
receive server num : [ 9 ]
receive server num : [ 10 ]
client disconnect
　　小结：
　　通过一个Hello World完成了基于mina编写的客户端和服务端通信的例子，接下通过解析源代码的方式来了解mina客户端和服务端通讯的过程。Apache MINA (3) NioSocketAcceptor初始化 
　　代码在附件中