2014.11.28测试题，验证码生成及模拟

最新推荐文章于 2021-02-01 09:34:00 发布

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本文介绍了一个使用Java实现的简单验证码生成器。该生成器能够生成包含字母和数字的验证码，并利用随机颜色和干扰线提高安全性。通过双缓冲技术优化了绘制过程，确保了较好的用户体验。

1.

package com.hechao;

import java.awt.Color;
import java.awt.Graphics;

public class MyUtil {

	private MyUtil(){
		
	}
	/**
	 * 随机验证码
	 * @return
	 */
	public static String indentfyCode(){
		int choise = (int) (Math.random() * 3);
		switch(choise){
		case 0 :
			char c1 = 'A';
			int random1 = (int) (Math.random() * 26);			
			c1 += random1;
			return c1 + "";
		case 1 :
			char c2 = 'a';
			int random2 = (int) (Math.random() * 26);			
			c2 += random2;
			return c2 + "";
		default :			
			return (int)(Math.random() * 10) + "";
		}
		
	}
	/**
	 * 随机颜色
	 * @return
	 */
	public static Color randomColor(){
		int r = (int) (Math.random() * 256);
		int g = (int) (Math.random() * 256);
		int b = (int) (Math.random() * 256);
		Color color = new Color(r, g, b);
		return color;	
	}
	/**
	 * 画干扰线
	 * @param g 画笔
	 */
	public static void drawRandomLine(Graphics g){
		int x1 = 25;
		int y1 = (int) (Math.random() * 100 + 35);
		int x2 = 275;
		int y2 = (int) (Math.random() * 100 + 35);
		g.drawLine(x1, y1, x2, y2);
	}
}

package com.hechao;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Stroke;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import javax.swing.JFrame;
/**
 * 验证码窗口
 * @author 何超
 *
 */
@SuppressWarnings("serial")
public class MyFrame extends JFrame {
	private int identfyingCodeLength = 6;
	private String[] str = new String[identfyingCodeLength];
	private BufferedImage bi = new BufferedImage(300, 150, 1);
	
	public MyFrame(){
		this.setTitle("验证码");
		this.setSize(300, 150);
		this.setResizable(false);
		this.setLocationRelativeTo(null);
		this.setDefaultCloseOperation(EXIT_ON_CLOSE);
		
		this.addMouseListener(new MouseAdapter() {

			@Override
			public void mousePressed(MouseEvent arg0) {
				initialised();
			}
			
		});
		initialised();
	}
	/**
	 * 初始化
	 * 产生验证码
	 */
	private void initialised(){
		for(int i = 0; i < identfyingCodeLength; i++){
			str[i] = MyUtil.indentfyCode();
			repaint();
		}
	}
	
	
	@Override
	public void paint(Graphics g) {
		//双缓冲
		Graphics offG = bi.getGraphics();
		super.paint(offG);
		Graphics2D g2d = (Graphics2D) offG;	
		//保存现场
		Stroke oldStroke = g2d.getStroke();	
		Color oldColor = g2d.getColor();
		
		//改变画笔，画20根干扰直线
		for(int i = 0; i < 20; i++){
			offG.setColor(MyUtil.randomColor());
			g2d.setStroke(new BasicStroke(1));
			MyUtil.drawRandomLine(offG);
		}
		//画验证码
		for (int i = 0; i < identfyingCodeLength; i++) {
			offG.setColor(MyUtil.randomColor());
			offG.setFont(new Font("Consolas", Font.BOLD, 42));
			offG.drawString(str[i], 50 + i * 35, 100);
		}
		
		g.drawImage(bi, 0, 0, null);
		//恢复现场
		g2d.setStroke(oldStroke);
		g2d.setColor(oldColor);		
		
	}
	public static void main(String[] args) {
		new MyFrame().setVisible(true);
	}
}