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Mina入门实例(一)

时间:2014-08-27 14:19:07      阅读:207      评论:0      收藏:0      [点我收藏+]

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mina现在用的很多了,之前也有用到,但是毕竟不熟悉,于是查了一些资料,做了一些总结。看代码是最直观的,比什么长篇大论都要好。不过其中重要的理论,也要理解下。

首先是环境,程序运行需要几个包,这里用maven比较方便。

pom.xml:

<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>MyMinaServer</groupId>
  <artifactId>mina</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>mina</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</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>  
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

然后就可以写代码了。

---------------------------------------------------------- 分割线 -----------------------------------------------------------------------------------------

一,简单的客户端和服务端程序

服务端程序:

package MyMinaServer.mina;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.charset.Charset;

import org.apache.mina.core.service.IoAcceptor;
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.filter.logging.LoggingFilter;
import org.apache.mina.transport.socket.nio.NioSocketAcceptor;

public class MainServer {
    private static final int Port=8888;
    public static void main(String[] args) {
        IoAcceptor ioAcceptor=new NioSocketAcceptor();
        System.out.println("begin server....");
        ioAcceptor.getFilterChain().addLast("logger", new LoggingFilter());
        ioAcceptor.getFilterChain().addLast("codec", new ProtocolCodecFilter(new TextLineCodecFactory(Charset.forName("UTF-8"))));
        ioAcceptor.setHandler(new HelloWorldHandler());
        ioAcceptor.getSessionConfig().setReadBufferSize(2048);
        ioAcceptor.getSessionConfig().setIdleTime(IdleStatus.BOTH_IDLE, 10);
        try {
            ioAcceptor.bind(new InetSocketAddress(Port));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

服务端,创建连接,然后这里注册了几个过滤链,这里简单写了需要的两个,到后面的内容中还可以加入一个加密的ssl链。

其中重要的是setHandler这个,在这个里面,我们可以定义自己的handler,然后做自己的业务。下面有这个handler的简单代码。

最后设置session的缓冲,和idle(空闲处理)的设定,再为此连接绑定一个端口。

其中需要注意的是,在服务端和客户端的代码里面,如果要传递string信息,codec编码过滤器中,要这么写:new ProtocolCodecFilter(new TextLineCodecFactory(Charset.forName("UTF-8")))。否则报错。

业务处理的handler:

package MyMinaServer.mina;

import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.session.IoSession;

public class HelloWorldHandler extends IoHandlerAdapter{

    @Override
    public void exceptionCaught(IoSession session, Throwable cause)
            throws Exception {
        // TODO Auto-generated method stub
        super.exceptionCaught(session, cause);
    }

    @Override
    public void messageReceived(IoSession session, Object message)
            throws Exception {
        // TODO Auto-generated method stub
        String string=message.toString();
        if (string.trim().equalsIgnoreCase("quit")) {
            session.close(true);
            return;
        }
        System.out.println("recevied message:"+string);
        String reply=" hi, i am server";
        session.write(reply);
        System.out.println("message have been written");
    }

    @Override
    public void messageSent(IoSession session, Object message) throws Exception {
        // TODO Auto-generated method stub
        System.out.println("message have been sent");
    }

    @Override
    public void sessionClosed(IoSession session) throws Exception {
        // TODO Auto-generated method stub
        System.out.println("closed session");
    }

    @Override
    public void sessionCreated(IoSession session) throws Exception {
        // TODO Auto-generated method stub
        System.out.println("session created");
    }

    @Override
    public void sessionIdle(IoSession session, IdleStatus status)
            throws Exception {
        // TODO Auto-generated method stub
        System.out.println("IDLE "+session.getIdleCount(status));
    }

    @Override
    public void sessionOpened(IoSession session) throws Exception {
        // TODO Auto-generated method stub
        System.out.println("session opened");
    }

}

这里的每个方法,算是事件。在每个事件中,我们可以定义自己的处理。在前面的《AndroidPn源码分析(一)》这篇文章中,笔者曾写过他们的每个事件代表的含义,不过从字面意思也很好理解。

这里主要是对接受到信息的处理,如果不是收到quit字符,则返回给客户端一句 hi,i am server。

服务端暂时到此,以下是客户端。

package com.example.mina.server;

import java.net.InetSocketAddress;
import java.nio.charset.Charset;

import org.apache.mina.core.filterchain.DefaultIoFilterChainBuilder;
import org.apache.mina.core.future.CloseFuture;
import org.apache.mina.core.future.ConnectFuture;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolCodecFilter;
import org.apache.mina.filter.codec.textline.TextLineCodecFactory;
import org.apache.mina.filter.logging.LoggingFilter;import org.apache.mina.transport.socket.SocketConnector;
import org.apache.mina.transport.socket.nio.NioSocketConnector;

import com.example.mina.charset.CharsetFactory;
import com.example.mina.hanlder.MsgHanler;public class MinaClient {

    private SocketConnector connector;
    private ConnectFuture future;
    private IoSession session;

    public boolean connect() {
        /*
         * 1.创建一个socket连接,连接到服务器
         */
        connector = new NioSocketConnector();

        /*
         * 获取过滤器链,用于添加过滤器
         */
        DefaultIoFilterChainBuilder chain = connector.getFilterChain();

        // b.添加日志过滤器
        chain.addLast("logger", new LoggingFilter());

        // c.添加字符的编码过滤器
        chain.addLast("codec", new ProtocolCodecFilter(new TextLineCodecFactory(Charset.forName("UTF-8"))));

        /*
         * 3.设置消息处理器,用于处理接收到的消息
         */
        connector.setHandler(new MsgHanler());

        /*
         * 4.根据IP和端口号连接到服务器
         */
        future = connector.connect(new InetSocketAddress("127.0.0.1", 8888));
        // 等待连接创建完成
        future.awaitUninterruptibly();

        /*
         * 5.获取session对象,通过session可以向服务器发送消息;
         */
        session = future.getSession();
        session.getConfig().setUseReadOperation(true);
        return future.isConnected();
    }

    /**
     * 往服务器发送消息
     * 
     * @param message
     */
    public void sendMsg2Server(String message) {
        session.write(message);
    }

    /**
     * 关闭与服务器的连接
     * 
     * @return
     */
    public boolean close() {
        CloseFuture future = session.getCloseFuture();
        future.awaitUninterruptibly(1000);
        connector.dispose();
        return true;
    }
}

然后同样是一个客户端的handler,和server的很像:

package com.example.mina.hanlder;

import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IoSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MsgHanler extends IoHandlerAdapter {
    private static final Logger log = LoggerFactory.getLogger(MsgHanler.class);

    @Override
    public void exceptionCaught(IoSession session, Throwable cause)
            throws Exception {
        // 出现异常
        log.error("--------exception--------");
        super.exceptionCaught(session, cause);
    }

    @Override
    public void messageReceived(IoSession session, Object message)
            throws Exception {
        // 从服务器中接收到消息后的处理
        log.info("--------msg receive--------");
        log.info("Message:{}" + message.toString());
        super.messageReceived(session, message);
    }

    @Override
    public void messageSent(IoSession session, Object message) throws Exception {
        // 往服务器中发送消息
        log.info("--------msg sent--------");
        super.messageSent(session, message);
    }

    @Override
    public void sessionCreated(IoSession session) throws Exception {
        // 当session被创建的时候调用
        log.info("--------session create--------");
        super.sessionCreated(session);
    }
}

写一个入口方法:

package com.example.mina.server;

public class Main {

    public static void main(String[] args) {
        MinaClient client=new MinaClient();
        client.connect();
        client.sendMsg2Server("message from cilent");
    }
}

这样,客户端就可以工作了。

先启动服务端,然后启动客户端,就可以看到在两个控制台中,分别有交互信息。

服务端:

begin server....
session created
session opened
recevied message:message from cilent
message have been written
message have been sent

客户端:

[QC] INFO [NioProcessor-2] org.apache.mina.filter.logging.LoggingFilter.log(186) | CREATED
[QC] INFO [NioProcessor-2] com.example.mina.hanlder.MsgHanler.sessionCreated(54) | --------session create--------
[QC] INFO [NioProcessor-2] org.apache.mina.filter.logging.LoggingFilter.log(186) | OPENED
[QC] INFO [NioProcessor-2] org.apache.mina.filter.logging.LoggingFilter.log(157) | SENT: HeapBuffer[pos=0 lim=0 cap=0: empty]
[QC] INFO [NioProcessor-2] com.example.mina.hanlder.MsgHanler.messageSent(47) | --------msg sent--------
[QC] INFO [NioProcessor-2] org.apache.mina.filter.logging.LoggingFilter.log(157) | RECEIVED: HeapBuffer[pos=0 lim=17 cap=2048: 20 68 69 2C 20 69 20 61 6D 20 73 65 72 76 65 72...]
[QC] INFO [NioProcessor-2] com.example.mina.hanlder.MsgHanler.messageReceived(39) | --------msg receive--------
[QC] INFO [NioProcessor-2] com.example.mina.hanlder.MsgHanler.messageReceived(40) | Message:{} hi, i am server

客户端因为用了log4j,打印比较多信息。

到此,这个例子就完成了。

 

Mina入门实例(一)

标签:android   style   blog   http   color   os   java   io   strong   

原文地址:http://www.cnblogs.com/juepei/p/3939119.html

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