Java Socket框架Apache MINA：简单套接字客户端读http网页数据

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Java Socket框架Apache MINA：简单套接字客户端读http网页数据

Apache MINA是Apache发展出来的一套Java Socket编程解决方案，基于Java NIO。Apache MINA相对比较简洁，易于快速部署和上手。
Apache MINA官方首页：http://mina.apache.org/ 
本文基于Apache MINA 2.0.20。
用Apache MINA实现一个简单的例子：做一个Apache MINA的Socket客户端，通过Socket套接字读取百度首页（www.baidu.com）的数据内容。代码如下：

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

import org.apache.mina.core.future.ConnectFuture;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IdleStatus;
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.nio.NioSocketConnector;

public class MINATest {
	private String mURL = "www.baidu.com";

	public static void main(String[] args) {
		try {
			MINATest test = new MINATest();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public MINATest() throws Exception {
		NioSocketConnector connector = new NioSocketConnector();
		
		// 过滤链。
		connector.getFilterChain().addLast("logger", new LoggingFilter());
		connector.getFilterChain().addLast("codec",
				new ProtocolCodecFilter(new TextLineCodecFactory(Charset.forName("UTF-8"))));

		// 处理。
		connector.setHandler(new SocketClientHandler());

		InetAddress inetAddress = InetAddress.getByName(mURL);
		InetSocketAddress inetSocketAddress = new InetSocketAddress(inetAddress.getHostAddress(), 80);

		// 连接。
		ConnectFuture connect = connector.connect(inetSocketAddress);
	}

	public class SocketClientHandler extends IoHandlerAdapter {

		// 会话创建。
		@Override
		public void sessionCreated(IoSession session) throws Exception {
			super.sessionCreated(session);
			System.out.println("#sessionCreated#");
		}

		// 会话打开时触发（第一次连接时先触发sessionCreated函数，后触发本函数）。
		@Override
		public void sessionOpened(IoSession session) throws Exception {
			super.sessionOpened(session);
			System.out.println("#sessionOpened#");
			
			session.write(doGet(mURL));
		}
		
		@Override
		public void messageSent(IoSession session, Object message) throws Exception {
			super.messageSent(session, message);
			System.out.println("#messageSent#");
			
			System.out.println("=============");
			System.out.println(message.toString());
			System.out.println("=============");
		}

		// 接收到消息时触发。
		@Override
		public void messageReceived(IoSession session, Object message) throws Exception {
			super.messageReceived(session, message);
			// System.out.println("messageReceived");

			System.out.print(message.toString());
		}

		@Override
		public void sessionClosed(IoSession session) throws Exception {
			super.sessionClosed(session);
			System.out.println("\n#sessionClosed#");
		}

		@Override
		public void sessionIdle(IoSession session, IdleStatus status) throws Exception {
			super.sessionIdle(session, status);
			System.out.println("#sessionIdle#");
		}
	}

	private String doGet(String s) {
		StringBuilder sb = new StringBuilder();
		sb.append("GET / HTTP/1.1\r\n");
		sb.append("Host: " + s + "\r\n");
		//sb.append("\r\n");

		return sb.toString();
	}
}

运行后输出结果：