验证码工具类

待我称王封你为后i 2022-04-25 04:28 264阅读 0赞

### 验证码工具类 ###

![在这里插入图片描述][20190501123116745.png]

package com.sky.ospringboot.common.utils;
    
    import java.awt.Color;
    import java.awt.Font;
    import java.awt.Graphics;
    import java.awt.image.BufferedImage;
    import java.util.Random;
    
    import javax.imageio.ImageIO;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    
    import lombok.extern.log4j.Log4j2;
    
    @Log4j2
    public class ValidateCodeUtil { 
    	public static final String RANDOMCODEKEY = "RANDOMVALIDATECODEKEY";// 放到session中的key
    	private int width = 95;// 图片宽
    	private int height = 25;// 图片高
    	private int lineSize = 40;// 干扰线数量
    	private int stringNum = 4;// 随机产生字符数量
    
    
    	private Random random = new Random();
    
    	/** * 获得字体 */
    	private Font getFont() { 
    		return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
    	}
    
    	/** * 获得颜色 */
    	private Color getRandColor(int fc, int bc) { 
    		if (fc > 255) { 
    			fc = 255;
    		}
    		if (bc > 255) { 
    			bc = 255;
    		}
    		int r = fc + random.nextInt(bc - fc - 16);
    		int g = fc + random.nextInt(bc - fc - 14);
    		int b = fc + random.nextInt(bc - fc - 18);
    		return new Color(r, g, b);
    	}
    
    	/** * 生成随机图片 */
    	public void getRandcode(HttpServletRequest request, HttpServletResponse response) { 
    		HttpSession session = request.getSession();
    		// BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
    		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
    		Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
    		g.fillRect(0, 0, width, height);// 图片大小
    		g.setFont(new Font("Default", Font.ROMAN_BASELINE, 18));// 字体大小
    		g.setColor(getRandColor(110, 133));// 字体颜色
    		// 绘制干扰线
    		for (int i = 0; i <= lineSize; i++) { 
    			drowLine(g);
    		}
    		// 绘制随机字符
    		String randomString = "";
    		for (int i = 1; i <= stringNum; i++) { 
    			randomString += drowString(g, getRandomString(), i);
    		}
    		log.info(randomString);
    		// 将生成的随机字符串保存到session中
    		session.removeAttribute(RANDOMCODEKEY);
    		session.setAttribute(RANDOMCODEKEY, randomString);
    		g.dispose();
    		try { 
    			// 将内存中的图片通过流动形式输出到客户端
    			ImageIO.write(image, "JPEG", response.getOutputStream());
    		} catch (Exception e) { 
    			log.error("将内存中的图片通过流动形式输出到客户端失败>>>> ", e);
    		}
    
    	}
    
    	/** * 绘制字符串 */
    	private String drowString(Graphics g, String rand, int i) { 
    		g.setFont(getFont());
    		g.setColor(new Color(random.nextInt(101), random.nextInt(111), random.nextInt(121)));
    		g.translate(random.nextInt(3), random.nextInt(3));
    		g.drawString(rand, 13 * i, 16);
    		return rand;
    	}
    
    	/** * 绘制干扰线 */
    	private void drowLine(Graphics g) { 
    		int x = random.nextInt(width);
    		int y = random.nextInt(height);
    		int xl = random.nextInt(13);
    		int yl = random.nextInt(15);
    		g.drawLine(x, y, x + xl, y + yl);
    	}
    
    	/** * 获取随机的字符 */
    	public String getRandomString() { 
    		StringBuffer sb = new StringBuffer();
    		sb.append("123456789");
    		sb.append("ABCDEFGHJKLMNPQRSTUVWXYZ");
    		sb.append("abcdefghjklmnpqrstuvwxyz");
    		int nextInt = random.nextInt(sb.length());
    		return sb.charAt(nextInt) + "";
    	}
    }

[20190501123116745.png]: /images/20220210/406a0069fc0d4c4b93b44af1cacb0457.png