socket demo程序

package cn.example.socket;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

public class MyClient {
    public static void main(String[] args) throws UnknownHostException,
            IOException {
        // 定义socket
        Socket socket = new Socket("localhost", 9999);
        // 获取输入输出
        InputStream inputStream = socket.getInputStream();
        OutputStream outputStream = socket.getOutputStream();

        // 处理

        PrintWriter pw = new PrintWriter(outputStream);
        pw.print("hello " + "socket\n");//换行符
        pw.flush();
        //pw.close();//不能关闭 Exception in thread "main" java.net.SocketException: socket closed

        String result = new BufferedReader(new InputStreamReader(inputStream))
                .readLine();

        System.out.println(result);
        inputStream.close();
        outputStream.close();

    }
}

package cn.example.socket;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;

public class MyServer {
    public static void main(String[] args) throws IOException {
        //建立server
        ServerSocket serverSocket = new ServerSocket();
        //绑定Ip
        serverSocket.bind(new InetSocketAddress("localhost", 9999));

        //启用一个线程处理
        while(true){
            System.out.println("server start");
            new Thread(new MysocketThread(serverSocket.accept())).start();

        }

    }
}

class MysocketThread implements Runnable {
    private Socket socket;
    InputStream inputStream = null;
    OutputStream outputStream = null;
    public MysocketThread(Socket socket) {
        super();
        this.socket = socket;
    }

    @Override
    public void run() {
        try {
            //定义输入输出流
            inputStream = socket.getInputStream();
            outputStream = socket.getOutputStream();

            //解析读入数据
            BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
            String param = br.readLine();

            //根据读入的数据处理业务逻辑，然后返回，这里简单返回
            String backValue = "ok "+param+"\n";

            PrintWriter pw = new PrintWriter(outputStream);
            pw.print(backValue);
            pw.flush();
            pw.close();

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally{
            try {
                socket.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            try {
                outputStream.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            try {
                inputStream.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

}