java Socket编程基础

 最简单的服务器接受单用户请求的socket编程模型，代码写得不好，只是用来阐明意思
 client side
import java.net.*;
import java.util.*;
import java.io.*;
public class Client {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try
{
Socket clientSocket=new Socket("localhost",9009);//connect
BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
PrintWriter out = new PrintWriter(clientSocket.getOutputStream(),true);
Scanner scanner=new Scanner(System.in);
System.out.print("username:");
String username=scanner.next();
System.out.print("password:");
String password=scanner.next();
out.println(username+" "+password);
String input;
while(true)
{
input=in.readLine();
if(input.equals("ok"))
{
System.out.println("message sent, cilent exit");
break;
}
}
in.close();
out.close();
clientSocket.close();

}
catch(Exception e)
{
System.err.println(e.getMessage());
}




}
}

server side
import java.net.*;
import java.io.*;
//import java.util.*;
public class Server {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try
{
ServerSocket serverSocket=new ServerSocket(9009);//listen 9008 port
//while(true)
//{
System.out.println("waiting for connecting");
Socket socket=serverSocket.accept();//create a socket to communicate
System.out.println("connected");
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintWriter out = new PrintWriter(socket.getOutputStream(),true);
String line;
while(true)
{
line = in.readLine();
if(line!=null)
{
break;
}
}
System.out.println("client said:" + line);
out.println("ok");
out.close();
i