Mina的客户端

(一)

package client;

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

import org.apache.mina.core.future.ConnectFuture;
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.transport.socket.nio.NioSocketConnector;

public class MinaSimpleClient {

	private static String HOSTNAME = "localhost";

	private static int PORT = 9123;

	public static void main(String[] args) throws InterruptedException {
		NioSocketConnector connector = new NioSocketConnector();
		// 设置编码解码器
		connector.getFilterChain().addLast("codec",
				new ProtocolCodecFilter(new TextLineCodecFactory(Charset.forName("UTF-8"))));
		// 设置Handler
		connector.setHandler(new ClientTimerHandler());
		// 获取连接，该方法为异步执行
		ConnectFuture future = connector.connect(new InetSocketAddress(HOSTNAME, PORT));
		// 设置空闲时间
		connector.getSessionConfig().setIdleTime(IdleStatus.BOTH_IDLE, 10);
		// 等待连接建立
		future.awaitUninterruptibly();
		// 获取session
		IoSession session = future.getSession();
		// 等待session关闭
		session.getCloseFuture().awaitUninterruptibly();
		// 释放connector资源
		// 实际开发中，不要频繁关闭connector，因为它是重量级资源，应该设计成单例或者连接池
		connector.dispose();

	}
}

(二)

package client;

import java.sql.Timestamp;

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

public class ClientTimerHandler extends IoHandlerAdapter {
	// 当一个客户端连接到服务器之后
	// 当打开一个连接时被触发。在目前的实现中，好像 sessionOpened 和 sessionCreated 没有太大区别，
	@Override
	public void sessionOpened(IoSession session) throws Exception {
		System.out.println("连接到服务器");
	}

	// 当消息创建时
	@Override
	public void sessionCreated(IoSession session) throws Exception {
		// session 创建时调用
		session.write("消息创建");
		System.out.println("消息创建");
	}

	// 消息到达时
	@Override
	public void messageReceived(IoSession session, Object message) throws Exception {
		// 异步接收消息
		String str = message.toString();
		System.out.println("接收服务端消息：" + str);
	}

	// 异常时调用
	@Override
	public void exceptionCaught(IoSession session, Throwable cause) throws Exception {
		// 出现异常
		System.out.println("服务器端断了！");
		cause.printStackTrace();
		session.close(true);
	}

	// 消息空闲时
	@Override
	public void sessionIdle(IoSession session, IdleStatus status) throws Exception {
		System.out.println("[Time]:" + new Timestamp(System.currentTimeMillis()) + "连接空闲");
		if (session != null) {
			session.close();
			System.out.println("空闲时间过后，session被关闭");
		}
	}

	// 当一个客户端关闭时
	@Override
	public void sessionClosed(IoSession session) {
		System.out.println("I'm Client =" + session.getId() + "  I closed!");
	}
}