JFrame 做一个简易的验证码

验证码生成器

最新推荐文章于 2021-08-30 09:53:12 发布

最新推荐文章于 2021-08-30 09:53:12 发布 · 447 阅读

文章标签：

#VC++ #Swing #C #C++ #C#

Java 专栏收录该内容

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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ValidationCode extends JFrame implements ActionListener{
 private JButton productBtn;
 private JPanel downPanel;
 public ValidationCode(){
 productBtn=new JButton("New Code");
 productBtn.addActionListener(this);
 productBtn.setSize(50,50);
 downPanel=new JPanel();
 downPanel.add(productBtn);
 this.setTitle("Validation Code");
 this.add(downPanel);
 }
 public void actionPerformed(ActionEvent e){
 this.repaint();
 }
 public void paint(Graphics g){
 super.paint(g);
 String code="";
 char[] characters={'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','1','2','3','4','5','6','7','8','9','0'};
 char[] fourResult=new char[4];
 int index;
 for (int k=0;k<4;k++ ){
 index=(int)(Math.random()*62);
 fourResult[k]=characters[index];
 }
 for(int i=0;i<4;i++)
 code+=fourResult[i];
 g.setColor(Color.RED);
 g.drawString(code,100,100);
 }
 public static void main(String[] args){
 ValidationCode vc=new ValidationCode();
 vc.setBounds(300,300,200,200);
 vc.setVisible(true);
 vc.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 }
}

运行结果：