socket应用

//服务器
import java.io. *;
import java.net.*;
import java.applet.Applet;
public class ChatServer {
public static void main(String args[]){
	try{
		ServerSocket server=null;
		try{
			server=new ServerSocket(4000);
			System.out.println("准备好了。退出输入bye");
		}catch(Exception e){
			System.out.println("can not listen to:"+e);
		}
		Socket socket=null;
		try{
			socket=server.accept();
		}catch(Exception e){
			System.out.println("Error."+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("bye")){
			os.println(line);
			os.flush();
			System.out.println("Server:"+line);
			System.out.println("Client:"+is.readLine());
			line=sin.readLine();
		}
		os.close();
		is.close();
		socket.close();
		server.close();
	}catch(Exception e){
		System.out.println("Error:"+e);
	}
}
}
//客户端
import java.io. *;
import java.net. *;
public class ChatClient {
public static void main(String args[]){
	 try{
		 Socket socket=new Socket("127.0.0.1",4000);
		 System.out.println("输入你要说的话，如果要退出输入bye");//由系统标准输入设备构造BufferedReader对象
		 BufferedReader sin=new BufferedReader(new InputStreamReader(System.in));//由Socket对象得到输出流，并构造PrintWrite对象
		 PrintWriter os=new PrintWriter(socket.getOutputStream());
		 BufferedReader is=new BufferedReader(new InputStreamReader(socket.getInputStream()));
		 String readline;
		 readline=sin.readLine();//从系统标准输入读入一字符串
		 while(!readline.equals("bye")){
			 os.println(readline);
			 os.flush();
			 System.out.println("Client:"+readline);
			 System.out.println("Server:"+is.readLine());
			 readline=sin.readLine();
		 }
		 os.close();
		 is.close();
		 socket.close();
	 }catch(Exception e){
		 System.out.println("Error"+e);
	 }
}
}