java的Socket通信问题，TCP的

题目：服务器是显示汇率的，然后从客户端的界面输入一个金额传给服务器，服务器接受计算后将结果传回客户端，客户端再显示到界面上.我的在客户端页面输入数据点计算之后界面都要用任务管理器关了......绝望.jpg
服务器：
public void start()
{
try {
serverSocket = new ServerSocket(113);
Socket socket = serverSocket.accept();

DataInputStream input = new DataInputStream(socket.getInputStream());

String clientInputStr = input.readUTF();

         DataOutputStream out = new DataOutputStream(socket.getOutputStream());

         String result=String.valueOf(Float.valueOf(text_rate.getText())*Integer.parseInt(clientInputStr));
         out.writeUTF(result);
     } catch (IOException e) {
         e.printStackTrace();
     }
}
客户端：if(ev.getSource()==button_cal);
    {
        try 
        { 
            DataInputStream input = new DataInputStream(socket.getInputStream());       
            DataOutputStream out = new DataOutputStream(socket.getOutputStream());      
            String str = new BufferedReader(new InputStreamReader(System.in)).readLine();    
            out.writeUTF(str);    

            String ret = input.readUTF(); 
            text_m2.setText(ret);
            socket.close();
         }
        catch (IOException e) 
        {
            e.printStackTrace();
        }
    }

https://www.cnblogs.com/lichenwei/p/4069432.html