java的socket 编程,主要是服务器和客户端的socket通讯

1.服务器端的代码 EchoServer.java

package com.zhai.server;

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.ServerSocket;
import java.net.Socket;

public class EchoServer {

    private int port = 8000;
    private ServerSocket serverSocket;

    public EchoServer() throws IOException {

        serverSocket = new ServerSocket(port);
        System.out.println("服务器启动");
    }

    public String echo(String msg) {

        return "echo:" + msg;

    }

    private PrintWriter getWriter(Socket socket) throws IOException {
        OutputStream socketOut = socket.getOutputStream();
        return new PrintWriter(socketOut, true);
    }

    private BufferedReader getReader(Socket socket) throws IOException {

        InputStream socketIn = socket.getInputStream();
        return new BufferedReader(new InputStreamReader(socketIn));

    }

    public void service() {
        while (true) {
            Socket socket = null;

            try {
                socket = serverSocket.accept();

                System.out.println("New connection accpeted"
                        + socket.getInetAddress() + ":" + socket.getPort());

                BufferedReader br = getReader(socket);
                PrintWriter pw = getWriter(socket);

                String msg = null;
                while ((msg = br.readLine()) != null) {
                    System.out.println(msg);
                    pw.println(echo(msg));
                    if (msg.equals("bye"))
                        break;

                }

            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } finally {

                if (socket != null)
                    try {
                        socket.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

            }

        }
    };

    public static void main(String args[]) throws IOException {
        new EchoServer().service();
    }
}

2.客户端的代码EchoClient.java

package com.zhai.client;

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 EchoClient {

    private String host = "localhost";
    private int port = 8000;
    private Socket socket;

    public EchoClient() throws IOException {

        socket = new Socket(host, port);

    }

    public static void main(String args[]) throws IOException {

        new EchoClient().talk();
    }

    private PrintWriter getWriter(Socket socket) throws IOException {
        OutputStream socketOut = socket.getOutputStream();
        return new PrintWriter(socketOut, true);
    }

    private BufferedReader getReader(Socket socket) throws IOException {

        InputStream socketIn = socket.getInputStream();
        return new BufferedReader(new InputStreamReader(socketIn));

    }

    public void talk() {

        BufferedReader br;
        try {
            br = getReader(socket);

            PrintWriter pw = getWriter(socket);
            BufferedReader localReader = new BufferedReader(
                    new InputStreamReader(System.in));

            String msg = null;
            while ((msg = localReader.readLine()) != null) {
                pw.println(msg);
                System.out.println(br.readLine());

                if (msg.equals("bye"))

                    break;

            }

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

        }

    }
}

3,运行的结果

image