同步阻塞式io通讯示例

服务器类

package com.bai.test;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
	public static void main(String[] args) throws IOException {
		int port = 8000;
		ServerSocket server = null;
		try {
			server = new ServerSocket(port);
			System.out.println("服务器启动");
			Socket socket = null;
			while(true){
				socket = server.accept();
				new Thread(new TimeServerHandler(socket)).start();
			}
		} finally {
			if(server != null){
				System.out.println("关闭服务");
				server.close();
				server = null;
			}
		}
	}
}	

任务线程类

package com.bai.test;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Date;

public class TimeServerHandler implements Runnable {
	private Socket socket;
	
	public TimeServerHandler(Socket socket) {
		this.socket = socket;
	}

	@Override
	public void run() {
		BufferedReader in = null;
		PrintWriter out = null;
		try {
			in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			out = new PrintWriter(socket.getOutputStream(),true);
			String currentTime = null;
			String body = null;
			while(true){
				body = in.readLine();
				if(body == null){
					break;
				}
				System.out.println("服务器功能："+body);
				currentTime = "查询".equals(body)?new Date(System.currentTimeMillis()).toString():"无服务";
				out.println(currentTime);
			}
		} catch (Exception e) {
			if(in != null){
				try {
					in.close();
				} catch (Exception e2) {
					e2.printStackTrace();
				}
			}
			if(out != null){
				try {
					out.close();
					out = null;
				} catch (Exception e2) {
					e2.printStackTrace();
				}
			}
			if(socket != null){
				try {
					socket.close();
				} catch (Exception e2) {
					e2.printStackTrace();
				}
				socket = null;
			}
		}
	}

}

客户端代码

package com.bai.test;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class Cilent {
	public static void main(String[] args) {
		int port = 8000;
		Socket socket = null;
		BufferedReader in = null;
		PrintWriter out = null;
		try {
			socket = new Socket("127.0.0.1", port);
			in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
			out = new PrintWriter(socket.getOutputStream(),true);
			out.println("查询时间");
			System.out.println("发送请求");
			String resp = in.readLine();
			System.out.println("现在是："+resp);
			
		} catch (Exception e) {
			e.printStackTrace();
		} finally{
			if(in != null){
				try {
					in.close();
				} catch (Exception e2) {
					e2.printStackTrace();
				}
			}
			if(out != null){
				try {
					out.close();
					out = null;
				} catch (Exception e2) {
					e2.printStackTrace();
				}
			}
			if(socket != null){
				try {
					socket.close();
				} catch (Exception e2) {
					e2.printStackTrace();
				}
				socket = null;
			}
		}
	}
}