socket 编程

server:
package com.scoket;

import java.net.*;

import java.io.*;

public class Server {
public static void main(String[] args) {
try {
ServerSocket server = null;
try {
server = new ServerSocket(4700);
} catch (Exception e) {
System.out.println(e);
}
Socket socket = null;
try {
socket = server.accept();
} catch (Exception e) {
System.out.println(e);
}
String line;
BufferedReader is = new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintWriter os = new PrintWriter(socket.getOutputStream());
BufferedReader sin =  new BufferedReader(new InputStreamReader(System.in));
    System.out.println("client:"+is.readLine());
    line = sin.readLine();
    while(!line.equals("exit")){
    os.print(line);
    os.flush();
    line = sin.readLine();
    }
    os.close();
    is.close();
    socket.close();
    server.close();

} catch (Exception e) {
System.out.println(e);
}
}
}
client：
package com.scoket;

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

public class Client {
public static void main(String args[]){
try {
Socket socket = new Socket("127.0.0.1",4700);
BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
PrintWriter os = new PrintWriter(socket.getOutputStream());
BufferedReader is = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String readline;
readline = buff.readLine();
while(!readline.equals("exit")){
os.println(readline);
os.flush();
System.out.println("Client-->"+readline);
readline = buff.readLine();
}
os.close();
is.close();
socket.close();
} catch (Exception e) {
System.out.println("exception:"+e);
}
}
}