UDP是一种用于开发point-to-point应用的传输协议（基于Swing的界面）

    new Thread() {
    	public void run() {
    		try {
    			//创建客户端的套接字
    			Socket socket=new Socket("localhost",Integer.parseInt(textField_2. getText()));
    			
    			//获取socket通道的输入流（输出流实现读取数据一行一行的读写
    			//InputStream in=socket.getInputStream();
    			BufferedReader br= new BufferedReader(new InputStreamReader(socket. getInputStream()));
    			String line=null;
    			
    			//用户点击发送按钮的时候写出
    			//获取socket通道的输出流，写一行换一行
    			bw= new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
    			if((line=br.read