用java写微信聊天程序（包括聊天界面，发送消息和接受消息）具体代码

写一个完整的微信聊天程序需要涉及到很多方面，包括前端界面、后端逻辑处理、网络通信等等，需要使用多种技术和工具进行开发。以下是一个简单的示例，用Java Swing编写了一个简单的聊天界面，并使用Socket进行网络通信，可以发送和接收文本消息。

前端界面代码：

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;

public class ChatFrame extends JFrame {

    private static final long serialVersionUID = 1L;
    private JPanel contentPane;
    private JTextField textField;
    private JTextArea textArea;
    private JButton btnSend;
    private Socket socket;
    private BufferedReader in;
    private PrintWriter out;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    ChatFrame frame = new ChatFrame();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public ChatFrame() {
        setTitle("微信聊天");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        JScrollPane scrollPane = new JScrollPane();
        scrollPane.setBounds(10, 10, 414, 200);
        contentPane.add(scrollPane);

        textArea = new JTextArea();
        textArea.setFont(new Font("微软雅黑", Font.PLAIN, 14));
        textArea.setEditable(false);
        textArea.setLineWrap(true);
        textArea.setForeground(Color.BLACK);
        textArea.setBackground(Color.WHITE);
        scrollPane.setViewportView(textArea);

        textField = new JTextField();
        textField.setFont(new Font("微软雅黑", Font.PLAIN, 14));
        textField.setBounds(10, 220, 300, 30);
        contentPane.add(textField);
        textField.setColumns(10);

        btnSend = new JButton("发送");
        btnSend.setFont(new Font("微软雅黑", Font.PLAIN, 14));
        btnSend.setBounds(320, 220, 100, 30);
        contentPane.add(btnSend);
        
        // 连接服务器
        try {
            socket = new Socket("localhost", 8888);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            out = new PrintWriter(socket.getOutputStream(), true);
            out.println("客户端已连接服务器！");
        } catch (IOException e1) {
            e1.printStackTrace();
        }

        // 发送消息
        btnSend.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String message = textField.getText();
                if (message != null && !message.equals("")) {
                    out.println(message);
                    textField.setText("");
                }
            }
        });

        // 接收消息
        new Thread(new Runnable() {
            public void run() {
                try {
                    while (true) {
                        String message = in.readLine();
                        if (message != null) {
                            textArea.append(message + "\n");
                            JScrollBar verticalBar = scrollPane.getVerticalScrollBar();
                            verticalBar.setValue(verticalBar.getMaximum());
                        }
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }
}

后端逻辑处理代码：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class ChatServer {

    public static void main(String[] args) {
        try {
            ServerSocket serverSocket = new ServerSocket(8888);
            System.out.println("服务器已启动！");
            Socket socket = serverSocket.accept();
            System.out.println("客户端已连接：" + socket.getInetAddress().getHostAddress());
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
            String message = in.readLine();
            System.out.println(message);

            while (true) {
                message = in.readLine();
                if (message != null) {
                    System.out.println("客户端：" + message);
                    out.println("服务端：" + message);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

以上代码只是一个简单的示例，实际的微信聊天程序需要更完善的功能和更复杂的实现方式。