java随机产生验证码，可以随机生成数字、大写字母、小写字母。还可以随机生成文字字体、及大小。在图片上面可能字体都不不同、大小不等。package com.hoo.util;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;/** * <b>function:</b> 验证码生成工具类 * @project NetWorkService * @package com.hoo.util * @fileName ValidCodeUtils.java * @createDate 2010-8-3 下午03:05:50 * @author hoojo */@SuppressWarnings("unused")public class ValidCodeUtils {/********************************************************************* * 验证码宽度 */public static int WIDTH = 60;/*** * 验证码高度 */public static int HEIGHT = 20;/********************************************************************** * 验证码背景颜色COLOR_FC_BG 应当小于COLOR_BC_BG */public static int COLOR_FC_BG = 200;/*** * 验证码背景颜色COLOR_FC_BG 应当小于COLOR_BC_BG */public static int COLOR_BC_BG = 250;/********************************************************************** * 验证码背景干扰线颜色COLOR_FC_LINE 应当小于COLOR_BC_LINE */public static int COLOR_FC_LINE = 160;/*** * 验证码背景干扰线颜色COLOR_FC_LINE 应当小于COLOR_BC_LINE */public static int COLOR_BC_LINE = 200;/*************************************************************************** * 验证码颜色COLOR_FC_CODE 应当小于COLOR_BC_CODE */public static int COLOR_FC_CODE = 20;/*** * 验证码颜色COLOR_FC_CODE 应当小于COLOR_BC_CODE */public static int COLOR_BC_CODE = 170;/*************************************************************************** * 生成在指定范围内的颜色 * @param fc 范围fc color值 小于255 * @param bc 范围bc color值 小于255 * @return Color */private static Color getRandColor(int fc, int bc) {Random random = new Random();if (fc < 0)fc = 0;if (bc < 0)bc = 1;if (fc > 255)fc = 255;if (bc > 255)bc = 255;if (bc == fc) bc += 10;int temp = 0;if (bc < fc) {temp = bc;bc = fc;fc = temp;}int r = fc + random.nextInt(bc - fc);int g = fc + random.nextInt(bc - fc);int b = fc + random.nextInt(bc - fc);return new Color(r, g, b);}/** * <b>function:</b> 生成图片方法 * @createDate 2010-8-3 下午03:06:22 * @author hoojo * @param request HttpServletRequest * @param response HttpServletResponse * @return boolean * @throws Exception */public static boolean getImage(HttpServletRequest request, HttpServletResponse response) throws Exception{response.reset();response.setContentType("image/jpeg");// 设置页面不缓存response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control", "no-cache");response.setDateHeader("Expires", 0);// 在内存中创建图象BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);// 获取图形上下文Graphics img = image.getGraphics();// 生成随机类Random random = new Random();// 设定背景色img.setColor(getRandColor(COLOR_FC_BG, COLOR_BC_BG));img.fillRect(0, 0, WIDTH, HEIGHT);// 设定字体img.setFont(new Font("Times New Roman", Font.PLAIN, 18));// 画边框// g.setColor(new Color());// g.drawRect(0,0,width-1,height-1);// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到img.setColor(getRandColor(COLOR_FC_LINE, COLOR_BC_LINE));for (int i = 0; i < 155; i++) {int x = random.nextInt(WIDTH);int y = random.nextInt(HEIGHT);int xl = random.nextInt(12);int yl = random.nextInt(12);img.drawLine(x, y, x + xl, y + yl);}// 取随机产生的认证码(4位数字)String codeValue = "";for (int i = 0; i < 4; i++) {//String rand = String.valueOf(random.nextInt(10));String rand = getRandomChar();codeValue = codeValue.concat(rand);img.setFont(getRandomFont());//随机字体// 将认证码显示到图象中img.setColor(getRandColor(COLOR_FC_CODE, COLOR_BC_CODE));img.drawString(rand, 13 * i + 6, 16);}request.getSession().setAttribute("codeValue", codeValue);// 图象生效img.dispose();// 输出图象到页面return ImageIO.write(image, "JPEG", response.getOutputStream());}/** * 随机生成字符，含大写、小写、数字 * <b>function:</b> 功能 * @createDate 2010-8-23 上午10:33:55 * @author hoojo * @return */public static String getRandomChar() {int index = (int) Math.round(Math.random() * 2);String randChar = "";switch (index) {case 0://大写字符randChar = String.valueOf((char)Math.round(Math.random() * 25 + 65));break;case 1://小写字符randChar = String.valueOf((char)Math.round(Math.random() * 25 + 97));break;default://数字randChar = String.valueOf(Math.round(Math.random() * 9));break;}return randChar;}/** * <b>function:</b> 随机生成字体、文字大小 * @createDate 2010-8-23 上午10:44:22 * @author hoojo * @return */public static Font getRandomFont() {String[] fonts = {"Georgia", "Verdana", "Arial", "Tahoma", "Time News Roman", "Courier New", "Arial Black", "Quantzite"};int fontIndex = (int)Math.round(Math.random() * (fonts.length - 1));int fontSize = (int) Math.round(Math.random() * 4 + 16);return new Font(fonts[fontIndex], Font.PLAIN, fontSize);}}java随机产生验证码，可以随机生成数字、大写字母、小写字母。还可以随机生成文字字体、及大小。</p></div><br /><hr><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.2.1/css/bootstrap.min.css" integrity="sha512-siwe/oXMhSjGCwLn+scraPOWrJxHlUgMBMZXdPe2Tnk3I0x3ESCoLz7WZ5NTH6SZrywMY+PB1cjyqJ5jAluCOg==" 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