在线聊天项目1.4版 使用Gson方法解析Json字符串以便重构request和response的各种请求和响应 解决聊天不畅问题 Gson包下载地址

在线聊天项目结构图：

多用户登陆效果图：

多用户聊天效果图：

数据库效果图：

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重新构建了Server类，使用了Gson方法，通过解析Json字符串，增加Info类，简化判断过程。

Server类代码如下：

package com.swift.server;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.IOException;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.List;
import java.util.Vector;

import com.google.gson.Gson;
import com.swift.jdbc.DBAdd;
import com.swift.jdbc.DBLogin;
import com.swift.other.User;
import com.swift.util.Info;

public class Server {

    boolean started = false;
    ServerSocket ss = null;
    Socket s = null;
    List<Client> clients = new ArrayList<Client>();
    Vector<String> list = new Vector<String>();

    public static void main(String[] args) {
        new Server().fun();
    }

    private void fun() {
        try {
            ss = new ServerSocket(8888);
            started = true;
        } catch (BindException e) {
            System.out.println("端口使用中......");
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        try {
            while (started) {
                s = ss.accept();
                System.out.println("a client connected success");
                Client c = new Client(s);
                clients.add(c);
                new Thread(c).start();

            }
        } catch (EOFException e) {
            System.out.println("client has closed.");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                ss.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

    class Client implements Runnable {

        public Socket s;
        public DataInputStream dis;
        public DataOutputStream dos;
        private boolean connected = false;

        public Client(Socket s) {
            this.s = s;
            try {
                this.dis = new DataInputStream(s.getInputStream());
                this.dos = new DataOutputStream(s.getOutputStream());
                connected = true;
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        @Override
        public void run() {
            try {
                while (connected) {
                    // 接收客户端请求
                    String json = dis.readUTF();
                    Gson gson = new Gson();
                    Info info = gson.fromJson(json, Info.class);
                    if (info.getState().equals("login")) {

                        String phone = info.getPhone();
                        String password = info.getPassword();
                        System.out.println(phone);
                        System.out.println(password);

                        User user = new User(phone, password);
                        boolean login = DBLogin.login(user);
                        if (login) {
                            dos.writeUTF("success");
                            dos.flush();
                            String userName = dis.readUTF();
                            // 添加进好友列表Vector
                            list.addElement(userName);

                            System.out.println();
                            // 每当有成功登陆就向各个客户端发送完整列表
                            for (int i = 0; i < clients.size(); i++) {
                                Client c = clients.get(i);
                                System.out.println(c.s.getPort());
                                for (int j = 0; j < list.size(); j++) {
                                    String name = list.get(j);
                                    System.out.println(name);
                                    String json_name = "{"state":"friends","msg":"" + name + ""}";
                                    c.send(json_name);
                                }
                            }

                        } else {
                            dos.writeUTF("fail");
                            dos.flush();
                        }

                    } else if (info.getState().equals("reg")) {
                        String phone = info.getPhone();
                        String password = info.getPassword();
                        System.out.println(phone);
                        System.out.println(password);

                        User user = new User(phone, password);
                        boolean flag = DBAdd.add(user);
                        if (flag) {
                            dos.writeUTF("success");
                        }else {
                            dos.writeUTF("fail");
                        }
                    } else if (info.getState().equals("chat")) {
                        System.out.println(json);
                        for (int i = 0; i < clients.size(); i++) {
                            Client c = clients.get(i);
                            c.send(json);
                        }
                    }

                }
            } catch (SocketException e) {
                System.out.println("一个登陆窗已经关闭....");
            } catch (EOFException e) {
                System.out.println("a client has been closed,can't read message from it.");
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (s != null) {
                    try {
                        s.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (dis != null) {
                    try {
                        dis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (dos != null) {
                    try {
                        dos.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }

        private void send(String str) {
            try {
                this.dos.writeUTF(str);
                this.dos.flush();
            } catch (SocketException e) {
                clients.remove(this);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }
}

新增的工具类Info，通过info对象的get方法把获得服务端得到的各种字符串直接归类了。

Info类代码如下：

package com.swift.util;

public class Info {
    private String state;
    private String msg;
    private String phone;
    private String password;
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getState() {
        return state;
    }
    public void setState(String state) {
        this.state = state;
    }
    public String getMsg() {
        return msg;
    }
    public void setMsg(String msg) {
        this.msg = msg;
    }
    
}

重构了登陆窗口的登陆和注册请求

登陆窗口的代码如下：

package com.swift.frame;

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ConnectException;
import java.net.Socket;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.TitledBorder;

import com.swift.util.Center;

public class LoginDialog extends JDialog {

    private static final long serialVersionUID = 1L;
    private JPasswordField passwordField_2;
    private JPasswordField passwordField_1;
    private JTextField textField_2;
    private JTextField textField;

    Socket s;
    DataOutputStream dos;
    DataInputStream dis;

    public static void main(String args[]) {
        JFrame.setDefaultLookAndFeelDecorated(true);
        JDialog.setDefaultLookAndFeelDecorated(true);

        try {
            UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
        } catch (ClassNotFoundException e1) {
            e1.printStackTrace();
        } catch (InstantiationException e1) {
            e1.printStackTrace();
        } catch (IllegalAccessException e1) {
            e1.printStackTrace();
        } catch (UnsupportedLookAndFeelException e1) {
            e1.printStackTrace();
        }

        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    LoginDialog dialog = new LoginDialog();
                    dialog.addWindowListener(new WindowAdapter() {
                        public void windowClosing(WindowEvent e) {
                            System.exit(0);
                        }
                    });
                    dialog.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public LoginDialog() {
        super();
        setResizable(false);
        setTitle("在线聊天登录框");
        getContentPane().setLayout(null);
        setBounds(100, 100, 427, 301);// 注册时高度为578，不注册是301

        // 设置窗口居中
        this.setLocation(Center.getPoint(this.getSize()));

        final JTextField textField_1 = new JTextField();
        textField_1.setBounds(148, 90, 192, 42);
        getContentPane().add(textField_1);

        final JLabel label = new JLabel();
        label.setText("帐    号");
        label.setBounds(76, 102, 66, 18);
        getContentPane().add(label);

        final JLabel label_1 = new JLabel();
        label_1.setText("密    码");
        label_1.setBounds(76, 167, 66, 18);
        getContentPane().add(label_1);

        final JPasswordField passwordField = new JPasswordField();
        passwordField.setBounds(148, 155, 192, 42);
        getContentPane().add(passwordField);

        final JButton button_1 = new JButton();
        button_1.addActionListener(new ActionListener() {
            public void actionPerformed(final ActionEvent e) {

                String phone = new String(textField_1.getText()).trim();
                String password = new String(passwordField.getPassword()).trim();
                if (!phone.equals("") && !password.equals("")) {
                    try {
                        String json_login = "{"state":"login","phone":"" + phone + "","password":""
                                + password + ""}";
                        dos.writeUTF(json_login);
                        dos.flush();
                        String flag = dis.readUTF();
                        if (flag.equals("success")) {
                            javax.swing.JOptionPane.showMessageDialog(LoginDialog.this, "登录成功");
                            // 把登陆成功的用户发送给服务端,作为好友列表信息
                            dos.writeUTF(phone);
                            dos.flush();
                            // 登陆窗消失
                            LoginDialog.this.dispose();
                            // 好友列表窗出现
                            new FriendsFrame(phone, s);

                        } else if (flag.equals("fail")) {
                            javax.swing.JOptionPane.showMessageDialog(LoginDialog.this, "登录失败");
                        }
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }
                } else {
                    javax.swing.JOptionPane.showMessageDialog(LoginDialog.this, "用户名密码必须填写...");
                    return;
                }
            }
        });
        button_1.setText("登录");
        button_1.setBounds(230, 222, 106, 36);
        getContentPane().add(button_1);

        final JButton button = new JButton();
        button.addActionListener(new ActionListener() {
            public void actionPerformed(final ActionEvent e) {
                if (LoginDialog.this.getHeight() == 301) {
                    LoginDialog.this.setSize(427, 578);
                } else {
                    LoginDialog.this.setSize(427, 301);
                }
                // 设置窗口不断居中
                LoginDialog.this.setLocation(Center.getPoint(LoginDialog.this.getSize()));
            }
        });
        button.setText("注册");
        button.setBounds(76, 222, 106, 36);
        getContentPane().add(button);

        final JPanel panel = new JPanel();
        panel.setLayout(null);
        panel.setBorder(new TitledBorder(null, "注册用户", TitledBorder.DEFAULT_JUSTIFICATION,
                TitledBorder.DEFAULT_POSITION, null, null));
        panel.setBounds(10, 278, 401, 226);
        getContentPane().add(panel);

        final JLabel label_2 = new JLabel();
        label_2.setBounds(44, 41, 65, 18);
        label_2.setText("手机号：");
        panel.add(label_2);

        textField = new JTextField();
        textField.setBounds(115, 35, 225, 30);
        panel.add(textField);

        final JButton button_2 = new JButton();
        button_2.setText("发送验证");
        button_2.setBounds(243, 75, 97, 30);
        panel.add(button_2);

        textField_2 = new JTextField();
        textField_2.setBounds(115, 104, 95, 30);
        panel.add(textField_2);

        final JLabel label_3 = new JLabel();
        label_3.setText("验证码：");
        label_3.setBounds(44, 110, 65, 18);
        panel.add(label_3);

        passwordField_1 = new JPasswordField();
        passwordField_1.setBounds(115, 143, 231, 30);
        panel.add(passwordField_1);

        passwordField_2 = new JPasswordField();
        passwordField_2.setBounds(115, 175, 231, 30);
        panel.add(passwordField_2);

        final JLabel label_4 = new JLabel();
        label_4.setText("密        码：");
        label_4.setBounds(44, 149, 65, 18);
        panel.add(label_4);

        final JLabel label_5 = new JLabel();
        label_5.setText("验证密码：");
        label_5.setBounds(44, 181, 65, 18);
        panel.add(label_5);

        final JButton button_3 = new JButton();
        button_3.setBounds(47, 510, 97, 30);
        getContentPane().add(button_3);
        button_3.setText("放弃");

        final JButton button_4 = new JButton();
        button_4.addActionListener(new ActionListener() {
            public void actionPerformed(final ActionEvent e) {

                String phone = textField.getText();
                String password = null;
                String str1 = new String(passwordField_1.getPassword()).trim();
                String str2 = new String(passwordField_2.getPassword()).trim();
                if (!phone.equals("") && !str1.equals("") && !str2.equals("")) {
                    if (str1.equals(str2)) {
                        password = new String(passwordField_2.getPassword()).trim();
                        try {
                            String json_reg = "{"state":"reg","phone":"" + phone + "","password":""
                                    + password + ""}";
                            dos.writeUTF(json_reg);
                            dos.flush();
                            String flag = dis.readUTF();
                            if (flag.equals("success")) {
                                javax.swing.JOptionPane.showMessageDialog(LoginDialog.this, "注册成功...");
                                textField.setText("");
                                passwordField_1.setText("");
                                passwordField_2.setText("");
                            } else {
                                javax.swing.JOptionPane.showMessageDialog(LoginDialog.this, "注册失败...");
                            }
                        } catch (IOException e1) {
                            e1.printStackTrace();
                        }
                    } else {
                        javax.swing.JOptionPane.showMessageDialog(LoginDialog.this, "输入密码不一致...");
                        System.out.println("输入密码不一致...");
                        passwordField_1.setText("");
                        passwordField_2.setText("");
                    }

                } else {
                    javax.swing.JOptionPane.showMessageDialog(LoginDialog.this, "用户名密码必须填写...");
                    return;
                }
            }
        });

        button_4.setBounds(262, 510, 97, 30);
        getContentPane().add(button_4);
        button_4.setText("注册用户");

        connect();

    }

    public void connect() {
        try {
            s = new Socket("127.0.0.1", 8888);// 以本机做server
            System.out.println("一个客户端登陆中....!");
            dos = new DataOutputStream(s.getOutputStream());
            dis = new DataInputStream(s.getInputStream());

        } catch (ConnectException e) {
            System.out.println("服务端异常.........");
            System.out.println("请确认服务端是否开启.........");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

对好友列表窗的死循环傻傻等待服务端信息，进行了重构，通过Gson方法自动判断所获得的Json串信息到底是好友的更新还是聊天信息的更新。

好友列表窗代码如下：

package com.swift.frame;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.SocketException;
import java.util.Vector;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JTabbedPane;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

import com.google.gson.Gson;
import com.google.gson.JsonObject;
import com.swift.util.Info;

public class FriendsFrame extends JFrame {

    private static final long serialVersionUID = 1L;
    private Socket s;
    private DataOutputStream dos;
    private DataInputStream dis;
    private boolean connected = false;
    Vector<String> names = new Vector<String>();
    JList<String> list = null;

    public FriendsFrame(String name, Socket socket) {
        super("欢迎 " + ":" + socket.getLocalPort());
        this.s = socket;
        connected = true;
        names.add("登录用户");
        try {
            this.dos = new DataOutputStream(s.getOutputStream());
            this.dis = new DataInputStream(s.getInputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }
        JFrame.setDefaultLookAndFeelDecorated(true);
        JDialog.setDefaultLookAndFeelDecorated(true);

        try {
            UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
        } catch (ClassNotFoundException e1) {
            e1.printStackTrace();
        } catch (InstantiationException e1) {
            e1.printStackTrace();
        } catch (IllegalAccessException e1) {
            e1.printStackTrace();
        } catch (UnsupportedLookAndFeelException e1) {
            e1.printStackTrace();
        }

        setBounds(100, 100, 247, 581);
        setVisible(true);
        final JPanel panel = new JPanel();
        panel.setLayout(new BorderLayout());
        getContentPane().add(panel, BorderLayout.NORTH);

        final JLabel label = new JLabel(new ImageIcon("Images/logo.jpg"));
        label.setText("New JLabel");
        panel.add(label, BorderLayout.WEST);
        label.setPreferredSize(new Dimension(74, 74));

        final JPanel panel_1 = new JPanel();
        panel_1.setLayout(new BorderLayout());
        panel.add(panel_1, BorderLayout.CENTER);

        final JLabel advancingSwiftLabel = new JLabel();
        advancingSwiftLabel.setText(name);
        panel_1.add(advancingSwiftLabel, BorderLayout.CENTER);

        final JLabel neverWasterLabel = new JLabel();
        neverWasterLabel.setText("Never waste time any more");
        panel_1.add(neverWasterLabel, BorderLayout.SOUTH);

        final JPanel panel_2 = new JPanel();
        panel_2.setLayout(new BorderLayout());
        getContentPane().add(panel_2, BorderLayout.SOUTH);

        final JPanel panel_3 = new JPanel();
        final FlowLayout flowLayout = new FlowLayout();
        flowLayout.setAlignment(FlowLayout.LEFT);
        panel_3.setLayout(flowLayout);
        panel_2.add(panel_3);

        final JButton button = new JButton();
        panel_3.add(button);
        button.setHorizontalTextPosition(SwingConstants.LEFT);
        button.setHorizontalAlignment(SwingConstants.LEFT);
        button.setText("设置");

        final JButton button_1 = new JButton();
        panel_3.add(button_1);
        button_1.setText("查找");

        final JPanel panel_4 = new JPanel();
        panel_2.add(panel_4, BorderLayout.EAST);

        final JButton button_2 = new JButton();
        panel_4.add(button_2);
        button_2.setText("退出");

        final JTabbedPane tabbedPane = new JTabbedPane();
        getContentPane().add(tabbedPane, BorderLayout.CENTER);

        final JPanel panel_5 = new JPanel();
        tabbedPane.addTab("好友列表", null, panel_5, null);
        list = new JList<String>();

        panel_5.add(list);

        final JPanel panel_6 = new JPanel();
        tabbedPane.addTab("群聊", null, panel_6, null);

        final JPanel panel_7 = new JPanel();
        tabbedPane.addTab("聊天记录", null, panel_7, null);

        this.setDefaultCloseOperation(EXIT_ON_CLOSE);

        final JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);

        final JMenu menu = new JMenu();
        menu.setText("操作");
        menuBar.add(menu);

        final JMenuItem newItemMenuItem = new JMenuItem();
        newItemMenuItem.setText("设置");
        menu.add(newItemMenuItem);

        final JMenuItem newItemMenuItem_1 = new JMenuItem();
        newItemMenuItem_1.setText("空间");
        menu.add(newItemMenuItem_1);

        final JMenuItem newItemMenuItem_2 = new JMenuItem();
        newItemMenuItem_2.setText("邮箱");
        menu.add(newItemMenuItem_2);

        final JMenu menu_1 = new JMenu();
        menu_1.setText("会员");
        menu.add(menu_1);

        final JMenuItem newItemMenuItem_3 = new JMenuItem();
        newItemMenuItem_3.setText("会员官网");
        menu_1.add(newItemMenuItem_3);

        final JMenuItem newItemMenuItem_4 = new JMenuItem();
        newItemMenuItem_4.setText("会员专区");
        menu_1.add(newItemMenuItem_4);

        menu.addSeparator();

        final JMenu menu_2 = new JMenu();
        menu_2.setText("安全");
        menu.add(menu_2);

        final JMenuItem newItemMenuItem_5 = new JMenuItem();
        newItemMenuItem_5.setText("紧急冻结");
        menu_2.add(newItemMenuItem_5);

        final JMenuItem newItemMenuItem_6 = new JMenuItem();
        newItemMenuItem_6.setText("密码保护");
        menu_2.add(newItemMenuItem_6);

        final JMenuItem newItemMenuItem_7 = new JMenuItem();
        newItemMenuItem_7.setText("退出");
        menu.add(newItemMenuItem_7);
        final FlowLayout flowLayout_1 = new FlowLayout();
        flowLayout_1.setAlignment(FlowLayout.RIGHT);

        this.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                disconnect();
                System.exit(0);
            }
        });

        // 调用傻傻的等待接收列表信息
        new Thread(new WaitingReceive()).start();
        // 双击激活聊天对话框
        list.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                if (e.getClickCount() == 2) {
                    new ChatFrame(s);
                }
            }
        });

    }

    public void disconnect() {
        try {
            if (dos != null)
                dos.close();
            if (dis != null)
                dis.close();
            if (s != null)
                s.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    class WaitingReceive implements Runnable {

        @Override
        public void run() {
            try {
                while (connected) {
                    String json = dis.readUTF();
                    Gson gson = new Gson();
                    Info info = gson.fromJson(json, Info.class);
                    System.out.println(json + "~~~~~~~~~~~~~~~~~~~~~~~~");
                    if (info.getState().equals("friends")) {
                        int flag = 0;
                        for (int i = 0; i < names.size(); i++) {
                            if (info.getMsg().equals(names.get(i))) {
                                flag = 1;
                            }
                        }
                        if (flag == 0) {
                            names.add(info.getMsg());
                        }
                        list.setListData(names);
                    }
                    if(info.getState().equals("chat")) {
                        ChatFrame.showTa(info.getMsg());
                        
                        System.out.println(info.getMsg());
                    }
                    
                }
            } catch (SocketException e) {
                System.out.println("a client has been closed!");
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * WindowBuilder generated method.<br>
     * Please don't remove this method or its invocations.<br>
     * It used by WindowBuilder to associate the {@link javax.swing.JPopupMenu} with
     * parent.
     */
    private static void addPopup(Component component, final JPopupMenu popup) {
        component.addMouseListener(new MouseAdapter() {
            public void mousePressed(MouseEvent e) {
                if (e.isPopupTrigger())
                    showMenu(e);
            }

            public void mouseReleased(MouseEvent e) {
                if (e.isPopupTrigger())
                    showMenu(e);
            }

            private void showMenu(MouseEvent e) {
                popup.show(e.getComponent(), e.getX(), e.getY());
            }
        });
    }
}

对聊天窗异常进行了处理，发现聊天窗与好友列表窗同时傻傻等待服务端信息，会引发冲突，聊天窗后于好友窗打开所以接不到任何信息。

所以将聊天窗的死循环去掉，而增加一个static静态方法showTa()用来在聊天窗之外供好友窗通过类名.(点)的方式调用，以改变ta(textArea)中的内容。

聊天窗代码如下：

package com.swift.frame;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ConnectException;
import java.net.Socket;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class ChatFrame extends JFrame {

    private static final long serialVersionUID = -118470059355655240L;
    private Socket s;
    private DataOutputStream dos;
    private DataInputStream dis;
    private boolean connected = false;
    JLabel label_shang = new JLabel();
    JLabel label_xia = new JLabel();
    JTextField tf = new JTextField(38);
    public static JTextArea ta = new JTextArea(15, 45);
    JButton button = new JButton();
    String tfText1 = null;

    public ChatFrame(Socket socket) {
        setBounds(200, 200, 500, 400);
        setTitle("客户端聊天工具 —— 1.4");
        // 对窗口进行大的布局，分为三行一列，在pBasic面板上添加三个面板shang zhong xia
        JPanel pBasic = new JPanel();
        pBasic.setLayout(new BorderLayout());// 不设置默认也是这种布局模式
        setContentPane(pBasic);// 把面板放在窗口上，不记得用this.关键字
        JPanel shang = new JPanel();
        JPanel zhong = new JPanel();
        JPanel xia = new JPanel();
        // 设置JPanel面板的大小
        shang.setSize(470, 25);
        zhong.setSize(470, 180);
        xia.setSize(470, 40);
        pBasic.add(shang, BorderLayout.NORTH);
        pBasic.add(zhong, BorderLayout.CENTER);
        pBasic.add(xia, BorderLayout.SOUTH);
        shang.setBackground(Color.red);
        zhong.setBackground(Color.yellow);
        xia.setBackground(Color.blue);

        label_shang.setText("聊天记录");
        shang.add(label_shang);
        ta.setLineWrap(true);// 自动换行
        JScrollPane scroll = new JScrollPane(ta);// 增加滚动条，以便不增加行数
        zhong.add(scroll);
        label_xia.setText("输入信息");
        xia.add(label_xia, BorderLayout.WEST);
        /*
         * 增加功能，窗口监听事件，窗口打开时设置光标焦点在tf文本域中
         */
        this.addWindowListener(new WindowAdapter() {
            @Override
            public void windowOpened(WindowEvent e) {
                tf.requestFocus();
            }
        });
        xia.add(tf, BorderLayout.CENTER);
        button.setText("发送");
        xia.add(button, BorderLayout.EAST);

        button.addActionListener(new MyListener());
        tf.addActionListener(new MyListener());
        pack();

        setVisible(true);
        // 创建窗体直接调用连接服务器
        this.s = socket;
        connected = true;
        try {
            dos = new DataOutputStream(s.getOutputStream());
            dis = new DataInputStream(s.getInputStream());
        } catch (ConnectException e) {
            System.out.println("服务端异常.........");
            System.out.println("请确认服务端是否开启.........");
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        
    }

    class MyListener implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            tfText1 = tf.getText();
            tf.setText("");
            // 当回车或发送按钮时，tfText发送到服务器
            String json_chat = "{"state":"chat","msg":"" + tfText1 + ""}";
            try {
                dos.writeUTF(json_chat);
                dos.flush();
            } catch (IOException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
        }
    }

    public static void showTa(String msg) {
        ta.setText(ta.getText()+msg+ "
");
    }

}

对数据库添加的类，DBAdd增加了布尔类型返回值，调用时方便判断是否注册成功

代码如下：

package com.swift.jdbc;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import com.swift.other.User;

public class DBAdd {
    
    public static boolean add(User user) {
        
        String phone = user.getUsername();
        String password = user.getPassword();
        
        Connection conn = DBUtil.getConn();
        PreparedStatement ps=null;
        try {
            ps = conn.prepareStatement("insert into sw_user(username,password) values(?,?)");
            ps.setString(1, phone);
            ps.setString(2, password);
            int count = ps.executeUpdate();
            if (count == 1) {
                return true;
            } 
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            DBUtil.closeAll(conn, ps, null);
        }
        return false;
        
    }

}

DBLogin，登陆的数据库没有改动

代码如下：

package com.swift.jdbc;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.swift.other.User;

public class DBLogin {

    public static boolean login(User user) {
        
        Connection conn=DBUtil.getConn();
        PreparedStatement ps=null;
        ResultSet rs=null;
        try {
            ps=conn.prepareStatement("select * from sw_user where username=? and password=?");
            ps.setString(1, user.getUsername());
            ps.setString(2, user.getPassword());
            rs=ps.executeQuery();
            if(rs.next()) {
                return true;
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        DBUtil.closeAll(conn, ps, rs);
        return false;
    }
}

连接数据库的工具类DBUtil没有改变

代码如下：

package com.swift.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUtil {
    
    public static Connection getConn() {
        Connection conn=null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            String url="jdbc:mysql://localhost:3306/sw_database";
            String user="root";
            String password="root";
            conn=DriverManager.getConnection(url, user, password);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return conn;
    }
    
    public static void closeAll(Connection conn,PreparedStatement ps,ResultSet rs) {
        
        if(conn!=null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(ps!=null) {
            try {
                ps.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(rs!=null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}

User类没有改变

package com.swift.other;

public class User {
    
    private int id;
    private String username;
    private String password;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public User(int id, String username, String password) {
        this.id = id;
        this.username = username;
        this.password = password;
    }
    public User() {
        super();
    }
    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }
    @Override
    public String toString() {
        return "User [id=" + id + ", username=" + username + ", password=" + password + "]";
    }
    
}

居中的工具类Center没有改变

package com.swift.util;

import java.awt.Dimension;
import java.awt.Point;
import java.awt.Toolkit;

public class Center {
    public static Point getPoint(int width,int height) {
        Toolkit toolkit=Toolkit.getDefaultToolkit();//应该是单例
        int screenW=toolkit.getScreenSize().width;
        int screenH=toolkit.getScreenSize().height;
        int x=(screenW-width)/2;
        int y=(screenH-height)/2;
        Point p=new Point(x,y);
        return p;
    }
    //函数的重载，参数是包装类尺寸——Dimension
    public static Point getPoint(Dimension d) {
        Point p=getPoint(d.width,d.height);
        return p;
    }
}

Gson包下载地址

 链接: https://pan.baidu.com/s/1nuG00dj 密码: x88h