Java 登录界面和验证码

程序设计思路:

首先是显示登录页面，注册页面，以及主页面

然后可以在表里存储数据，即注册用户，可以在图形框中输入数据

在后端检索所有数据，查看是否存在数据

随机生成验证码，并且要求输入的验证码与显示的对应

最后完成登录

源代码：

package yanzhengma;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class Interface extends JFrame {
private static final long serialVersionUID = 1L;

private static String record;

public static void main(String[] args) {
new Interface();
}

public Interface() {
// 创建 JFrame 实例
JFrame frame = new JFrame("请登录:");

  // 设置frame大小
  frame.setLocation(500, 300);
  frame.setSize(400, 200);
  frame.setResizable(false);
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// 创建面板
JPanel panel = new JPanel();

// 添加面板
frame.add(panel);

// 根据需要设置面板的具体形式
placeComponents(panel);

// 设置界面可见
frame.setVisible(true);

}

public void placeComponents(JPanel panel) {

// 清空面板
panel.setLayout(null);

  // 创建用户使用的组件
  JLabel userLabel = new JLabel("用户名:");
  userLabel.setBounds(10, 20, 80, 25);
  panel.add(userLabel);

  // 创建文本域用于用户输入
  JTextField userText = new JTextField(20);
  userText.setBounds(100, 20, 165, 25);
  panel.add(userText);

  // 创建密码使用的组件
  JLabel passwordLabel = new JLabel("密码:");
  passwordLabel.setBounds(10, 50, 80, 25);
  panel.add(passwordLabel);

  // 创建密码的文本域
  JPasswordField passwordText = new JPasswordField(20);
  passwordText.setBounds(100, 50, 165, 25);
  panel.add(passwordText);

  // 创建验证码使用的组件
  JLabel verificationLabel = new JLabel("验证码:");
  verificationLabel.setBounds(10, 80, 80, 25);
  panel.add(verificationLabel);

  // 创建验证码的文本域
  JTextField verificationText = new JTextField(20);
  verificationText.setBounds(100, 80, 80, 25);
  panel.add(verificationText);

  // 创建一个随机字符串
  String result = "";
  for (int i = 0; i < 6; i++) {
   int intVal = (int) (Math.random() * 26 + 97);
   result = result + (char) intVal;
  }
  record = result;

  // 创建验证码使用的显示的组件
  JLabel verificationShowLabel = new JLabel(result);
  verificationShowLabel.setBounds(200, 80, 80, 25);
  panel.add(verificationShowLabel);

  // 创建登录按钮
  JButton loginButton = new JButton("登录");
  loginButton.setBounds(10, 120, 80, 25);
  panel.add(loginButton);

  // 对按钮进行监视
  ActionListener ourListener1 = new ActionListener() {
   public void actionPerformed(ActionEvent e) {
    if (e.getSource() == loginButton) // 判断是否点击登录按钮
    {
     if (record.equalsIgnoreCase(verificationText.getText()))// 判断验证码是否正确
     {
      if (StoreroomManager.datelist.size() == 0)// 判断存储空间是否有数据
      {
       JOptionPane.showMessageDialog(null, "你还没有注册");
       userText.setText("");
       passwordText.setText("");

      } else// 对现有的date进行赋值，并且检索是否存在注册过的用户
      {
       Storeroom date = new Storeroom();
       date.setUser(userText.getText());// 获取用户输入的用户名
       date.setPassword(passwordText.getText());// 获取用户输入的密码
       StoreroomManager.confirmDate(date);
       passwordText.setText("");
       verificationText.setText("");
      }
     } else // 验证码不正确
     {
      passwordText.setText("");
      verificationText.setText("");
      JOptionPane.showMessageDialog(null, "验证码错误，请重新输入");
      // 创建一个随机字符串
      String result = "";
      for (int i = 0; i < 6; i++) {
       int intVal = (int) (Math.random() * 26 + 97);
       result = result + (char) intVal;
      }
      record = result;
      verificationShowLabel.setText(result);

     }
    }
   }
  };
  loginButton.addActionListener(ourListener1);

  // 创建注册按钮
  JButton registerButton = new JButton("注册");
  registerButton.setBounds(100, 120, 80, 25);
  panel.add(registerButton);

  // 对按钮进行监视
  ActionListener ourListener2 = new ActionListener() {
   public void actionPerformed(ActionEvent e) {
    if (e.getSource() == registerButton) {
     userText.setText("");
     passwordText.setText("");
     verificationText.setText("");
     new RegisterInterface();
    }
   }
  };
  registerButton.addActionListener(ourListener2);

  // 创建刷新按钮
  JButton refreshButton = new JButton("刷新");
  refreshButton.setBounds(250, 80, 80, 25);
  panel.add(refreshButton);

  // 对按钮进行监视
  ActionListener ourListener3 = new ActionListener() {
   public void actionPerformed(ActionEvent e) {
    if (e.getSource() == refreshButton) {
     passwordText.setText("");
     verificationText.setText("");
     // 创建一个随机字符串
     String result = "";
     for (int i = 0; i < 6; i++) {
      int intVal = (int) (Math.random() * 26 + 97);
      result = result + (char) intVal;
     }
     record = result;
     verificationShowLabel.setText(result);

    }
   }
  };
  refreshButton.addActionListener(ourListener3);
}
}

//本文件相当于数据库，用于存储数据

package yanzhengma;

import java.util.ArrayList;
import java.util.List;

import javax.swing.JOptionPane;

class Storeroom {
private String User;
private String password;

void setUser(String str) {
User = str;
}

String getUser() {
return User;

}

void setPassword(String str) {
password = str;
}

String getpassword() {
return password;

}

class StoreroomManager // 对数据进行操作的类
{
static List<Storeroom> datelist = new ArrayList<Storeroom>(0);

static void confirmDate(Storeroom date)// 登录,遍历数据
{
int flag = 0;

  for (int i = 0; i < datelist.size(); i++) {
   if (date.getUser().equalsIgnoreCase(datelist.get(i).getUser())) {
    if (date.getpassword().equalsIgnoreCase(datelist.get(i).getpassword())) {
     JOptionPane.showMessageDialog(null, "登录成功");
     flag++;
    }

   }
  }
  System.out.println("输入的数据:");
  System.out.println("用户名:" + date.getUser());
  System.out.println("密码:" + date.getpassword());
  for (int i = 0; i < datelist.size(); i++) {
   System.out.println("表中的" + (i + 1) + "个数据:");
   System.out.println("用户名:" + datelist.get(i).getUser());
   System.out.println("密码:" + datelist.get(i).getpassword());
  }
  if (flag == 0) {
   JOptionPane.showMessageDialog(null, "用户名或者密码错误!");
  }

}

static boolean searchDate(Storeroom date)// 登录,遍历数据
{
  int flag = 0;
  for (int i = 0; i < datelist.size(); i++) {
   if (date.getUser().equals(datelist.get(i).getUser()))
    if (date.getpassword().equals(datelist.get(i).getpassword()))
     flag++;
  }
  if (flag == 0)
   return false;
  else
   return true;

}

//本文件大致与Interface 类一样

package yanzhengma;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class RegisterInterface {

private static String record;

public RegisterInterface() {
// 创建 JFrame 实例
JFrame frame = new JFrame("欢迎来到注册页面:");

  // 设置frame大小
  frame.setLocation(500, 300);
  frame.setSize(400, 200);
  frame.setResizable(false);
  frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

// 创建面板
JPanel panel = new JPanel();

// 添加面板
frame.add(panel);

// 根据需要设置面板的具体形式
placeComponents(panel, frame);

// 设置界面可见
frame.setVisible(true);

}

public void placeComponents(JPanel panel, JFrame frame) {
// 清空面板
panel.setLayout(null);