如何在udp待办事项应用程序上选择日期并根据日期对待办事项进行排序

问题描述

我正在尝试使用todo服务创建UDP应用程序 像这样，但是以下代码显示了待办事项数组列表中的所有消息：客户端发送消息2020年10月14日，提交分配给 WSAPI。服务器响应消息：WSAPI的Submit Assignment；付电 帐单

package udpechoserver;
import java.io.*;
import java.net.*;
import java.util.ArrayList;
import java.util.List;
import udpechoclient.Todo;



public class UDPEchoServer
{
    private static final int PORT = 1234;
    private static DatagramSocket dgramSocket;
    private static DatagramPacket sendPacket,receivePacket;
    private static byte[] buffer;
     


public static byte[] serialize(Object obj) throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    ObjectOutputStream os = new ObjectOutputStream(out);
    os.writeObject(obj);
    return out.toByteArray();
}
    public static Object deserialize(byte[] data) throws IOException,ClassNotFoundException {
    ByteArrayInputStream in = new ByteArrayInputStream(data);
    ObjectInputStream is = new ObjectInputStream(in);
    return is.readobject();
}
public static void main(String[] args) {
    byte[] receiveData = new byte[65536];
    byte[] sendData = new byte[65536];
    
    try (DatagramSocket datagramSocket = new DatagramSocket(PORT);) {
        while (true) {
            try {
                System.out.println("server running at port  " + PORT + "!");
                DatagramPacket receivePacket = new DatagramPacket(receiveData,receiveData.length);
                datagramSocket.receive(receivePacket);
                int port = receivePacket.getPort();

                ArrayList<Todo> listofMessages = (ArrayList)deserialize(receivePacket.getData());
                  List<Todo> newList = new ArrayList<>(listofMessages);
                       
                  
                 System.out.println("Received [" + listofMessages.size() + "] messages  " );
        // print out the text of every message
                System.out.println("All messages:");
              
                
//               List<String> strings = newList.stream()
//   .map(o -> Todo.toString(object,null))
//   .collect(Collectors.toList()); attempt to filter information based on the dates from the new list creating list of strings and getting date from the newlist created 
  
              
                for(int i  =0;i<listofMessages.size();i++){
                    String date= listofMessages.get(i).getDate();

                        if(date.equalsIgnoreCase(listofMessages.get(i).getDate())){

                    System.out.println("Todo"+listofMessages.get(i).getMessage());
                    

                        }
                
                  
                
                
        }
                InetAddress address = receivePacket.getAddress();
                ArrayList<Todo> array = new ArrayList<Todo>();
               
                sendData = serialize(array);
                DatagramPacket sendPacket = new DatagramPacket(sendData,sendData.length,address,port);
                datagramSocket.send(sendPacket);
            } catch (ClassNotFoundException e) {
                e.printstacktrace();
            }



        }

    } catch (IOException e) {
        e.printstacktrace();
    }
}






}

解决方法

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