Java TCP客户端服务器端交互

package com.knightsight.chatroom;
import java.net.*;
import java.io.*;
/*
 * 输入流与输出流独立,客户端程序
 */
public class Client {
	public static void main(String[] args) throws IOException,UnknownHostException{
		Socket client =new Socket("localhost",9900);
		//控制台输入流
		BufferedReader console=new BufferedReader(new InputStreamReader(System.in));
		DataOutputStream dos=new DataOutputStream(client.getOutputStream());
		DataInputStream dis=new DataInputStream(client.getInputStream());
		while(true){
		String info=console.readLine();
		//输出流
		dos.writeUTF(info);
		dos.flush();
		//输入流
		String str=dis.readUTF();
		System.out.println(str);
		}
	}
}

package com.knightsight.chatroom;
import java.io.*;
import java.net.*;
public class Server {
	public static void main(String[] args) throws IOException{
		ServerSocket server=new ServerSocket(9900);
		Socket socket=server.accept();

		DataInputStream dis=new DataInputStream(socket.getInputStream());
		String str=dis.readUTF();
		
		DataOutputStream dos=new DataOutputStream(socket.getOutputStream());
		dos.writeUTF("服务器已收到"+str);
		dos.flush();
	}
}