J'ai écrit un logiciel de chat simple en Java en utilisant UDP, mais je ne peux recevoir aucun message. Veuillez me faire savoir quel est le problème avec le code.

package com.window; import javax.swing.*; import java.awt.*; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.util.logging.Logger; /** * Created by young on 2017/4/19. */ public class MainWindow { private JLabel lb_addIp; private JButton btn_add; private JPanel jp_qq; private JLabel lb_selectIP; private JComboBox cb_selectIP; private JTextField tf_addip; private JTextArea ta_charHistory; private JTextField tf_input; private JButton btn_submit; private JLabel lb_charHistory; private JLabel lb_message; private JTextPane tp; private String ip; private String sendMessage; private int sendport = 10023; private int receviceport = 10024; private DefaultListModel listModel = new DefaultListModel(); public String name; private List messageList = new ArrayList<>(); public MainWindow() { btn_add.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { ip = tf_addip.getText(); Object[] com = new Object[]{ip}; cb_selectIP.addItem(ip); } }); btn_submit.addMouseListener(new MouseAdapter() { Logger logger = Logger.getLogger("submit"); @Override public void mouseClicked(MouseEvent e) { if (ip == null) { lb_message.setForeground(Color.red); lb_message.setText("请输入IP。"); return; } try { InetAddress inetAddress = InetAddress.getByName(ip); if (!inetAddress.isReachable(2000)) { lb_message.setForeground(Color.red); lb_message.setText("无法链接该地址！"); return; } } catch (IOException e1) { e1.printStackTrace(); } sendMessage = tf_input.getText(); logger.info("sendMessage" + sendMessage); new Thread(() -> { send(sendMessage); lb_message.setForeground(Color.green); lb_message.setText("发送成功。"); }).start(); new Thread(() -> { receive(); }).start(); } }); } public void receive() { DatagramSocket datagramSocket = null; try { datagramSocket = new DatagramSocket(sendport, InetAddress.getByName(ip)); byte[] buf = new byte[1024]; DatagramPacket datagramPacket = new DatagramPacket(buf, buf.length); datagramSocket.receive(datagramPacket); String id = datagramPacket.getAddress().getHostAddress(); int port = datagramPacket.getPort(); byte[] date = datagramPacket.getData(); System.out.println(Arrays.toString(date)); String mes = ip + ":" + new String(date) + "\n"; //System.out.println("ip=" + id + "port=" + port); tp.setText(tp.getText() + mes); } catch (IOException e) { e.printStackTrace(); } finally { assert datagramSocket != null; datagramSocket.close(); } } public void initWindow() { JFrame frame = new JFrame("QQ"); frame.setContentPane(new MainWindow().jp_qq); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); frame.pack(); frame.setVisible(true); tp.setEditable(false); } public void send(String message) { DatagramSocket datagramSocket = null; try { datagramSocket = new DatagramSocket(receviceport); byte[] buf = message.getBytes(); DatagramPacket packet = new DatagramPacket(buf, buf.length, InetAddress.getByName(ip), sendport); datagramSocket.send(packet); tp.setText(tp.getText() + name + message + "\n"); } catch (IOException e) { e.printStackTrace(); } finally { datagramSocket.close(); } } }

Il y a beaucoup de code, donc je l'ai mis sur github
adresse github