1.Socket-简单示例

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

/**
 * @name SocketServer端
 * @author wujianxiong
 * @date 2016-5-16
 */
public class EchoServer {

    private int port=8000;

    private ServerSocket serverSocket;

    public EchoServer() throws IOException{
        this.serverSocket = new ServerSocket(port);
        System.out.println("服务器启动(端口:"+port+")");
    }

    public EchoServer(ServerSocket serverSocket) {
        this.serverSocket = serverSocket;
    }

    public void service(){
        while(true){
            Socket socket = null;
            try {
                //服务器等待客户端连接
                socket = serverSocket.accept();
                System.out.println("客户端"+socket.getInetAddress()+":"+socket.getPort()+"已连接!");
                BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));

                PrintWriter writer = new PrintWriter(socket.getOutputStream(), true);
                String msg = null;
                while((msg=reader.readLine())!=null){
                    writer.println("echo:"+msg);
                    if(msg.equals("bye"))
                        break;
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } finally{
                try {
                    if(socket!=null){
                        socket.close();
                        System.out.println("断开连接!");
                    }
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }
   //启动服务
    public static void main(String[] args) throws IOException{

        EchoServer echoServer = new EchoServer();
        echoServer.service();
    }

}

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

/**
 * @name Socket客户端
 * @author wujianxiong
 * @date 2016-5-16
 */
public class EchoClient {

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



    public EchoClient() throws UnknownHostException, IOException {
        socket = new Socket(host, port);
    }


    private void talk() throws IOException{
        BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));

        PrintWriter writer = new PrintWriter(socket.getOutputStream(), true);

        BufferedReader localReader = new BufferedReader(new InputStreamReader(System.in));
        String msg = null;
        while((msg=localReader.readLine())!=null){

            writer.println(msg);
            System.out.println(reader.readLine());
            if(msg.equals("bye"))
                break;
        }

        socket.close();
    }

    //访问服务
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        EchoClient client = new EchoClient();
        client.talk();
    }

}