Apache MINA (2) Hello World!

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本文详细介绍了使用 Apache MINA 框架实现客户端与服务端通讯的过程，通过 Hello World 示例展示了如何搭建简单的服务端和客户端，并解析了源代码以深入理解 MINA 的工作原理。

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