工具类
import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.*; import javax.imageio.ImageIO; /** * @author ：yinxiaoling * @ClassName ：VerificationUtil * @Description ：${todo}(用一句话描述该文件做什么) * @date ：2019/5/23 * @time ：15:07 */ public class VerificationUtil { /*** * 使用到Algerian字体，系统里没有的话需要安装字体，字体只显示大写，去掉了1,0,i,o几个容易混淆的字符 */ public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ"; private static Random random = new Random(); /** * 使用系统默认字符源生成验证码 * @param verifySize 验证码长度 * @return */ public static String generateVerifyCode(int verifySize){ return generateVerifyCode(verifySize, VERIFY_CODES); } /** * 使用指定源生成验证码 * @param verifySize 验证码长度 * @param sources 验证码字符源 * @return */ public static String generateVerifyCode(int verifySize, String sources){ if(sources == null || sources.length() == 0){ sources = VERIFY_CODES; } int codesLen = sources.length(); Random rand = new Random(System.currentTimeMillis()); StringBuilder verifyCode = new StringBuilder(verifySize); for(int i = 0; i < verifySize; i++){ verifyCode.append(sources.charAt(rand.nextInt(codesLen-1))); } return verifyCode.toString(); } /** * 生成随机验证码文件,并返回验证码值 * @param w * @param h * @param outputFile * @param verifySize * @return * @throws IOException */ public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{ String verifyCode = generateVerifyCode(verifySize); outputImage(w, h, outputFile, verifyCode); return verifyCode; } /** * 输出随机验证码图片流,并返回验证码值 * @param w * @param h * @param os * @param verifySize * @return * @throws IOException */ public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{ String verifyCode = generateVerifyCode(verifySize); outputImage(w, h, os, verifyCode); return verifyCode; } /** * 生成指定验证码图像文件 * @param w * @param h * @param outputFile * @param code * @throws IOException */ public static void outputImage(int w, int h, File outputFile, String code) throws IOException{ if(outputFile == null){ return; } File dir = outputFile.getParentFile(); if(!dir.exists()){ dir.mkdirs(); } try{ outputFile.createNewFile(); FileOutputStream fos = new FileOutputStream(outputFile); outputImage(w, h, fos, code); fos.close(); } catch(IOException e){ throw e; } } /** * 输出指定验证码图片流 * @param w * @param h * @param os * @param code * @throws IOException */ public static void outputImage(int w, int h, OutputStream os, String code) throws IOException{ int verifySize = code.length(); BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB); Random rand = new Random(); Graphics2D g2 = image.createGraphics(); g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON); Color[] colors = new Color[5]; Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN, Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE, Color.PINK, Color.YELLOW }; float[] fractions = new float[colors.length]; for(int i = 0; i < colors.length; i++){ colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)]; fractions[i] = rand.nextFloat(); } Arrays.sort(fractions); g2.setColor(Color.GRAY);// 设置边框色 g2.fillRect(0, 0, w, h); Color c = getRandColor(200, 250); g2.setColor(c);// 设置背景色 g2.fillRect(0, 2, w, h-4); //绘制干扰线 Random random = new Random(); g2.setColor(getRandColor(160, 200));// 设置线条的颜色 for (int i = 0; i < 20; i++) { int x = random.nextInt(w - 1); int y = random.nextInt(h - 1); int xl = random.nextInt(6) + 1; int yl = random.nextInt(12) + 1; g2.drawLine(x, y, x + xl + 40, y + yl + 20); } // 添加噪点 float yawpRate = 0.05f;// 噪声率 int area = (int) (yawpRate * w * h); for (int i = 0; i < area; i++) { int x = random.nextInt(w); int y = random.nextInt(h); int rgb = getRandomIntColor(); image.setRGB(x, y, rgb); } shear(g2, w, h, c);// 使图片扭曲 g2.setColor(getRandColor(100, 160)); int fontSize = h-4; Font font = new Font("Algerian", Font.ITALIC, fontSize); g2.setFont(font); char[] chars = code.toCharArray(); for(int i = 0; i < verifySize; i++){ AffineTransform affine = new AffineTransform(); affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize/2, h/2); g2.setTransform(affine); g2.drawChars(chars, i, 1, ((w-10) / verifySize) * i + 5, h/2 + fontSize/2 - 10); } g2.dispose(); ImageIO.write(image, "jpg", os); } /** * 随机生成字符 或 者数字 * @return */ private static String getRandom(){ String value = ""; Random random = new Random(); int gen = random.nextInt(2); String charOrNum = gen % 2 ==0 ? "char":"num"; if ("char".equals(charOrNum)) { //字符 int temp = random.nextInt(2)%2==0?65:97; int ascii = random.nextInt(26); value += (char)(ascii + temp); }else if ("num".equals(charOrNum)) { //是数字 value += String.valueOf(random.nextInt(10)); } return value; } /** * 随机生成字符串（包含字符和数字） * @param length 指定长度 * @return 返回set */ private static Set<String> getStrAndNum(int length) { Set<String> set = new HashSet<>(); for (int i = 0; i < length; i++) { String value = getRandom(); set.add(value); } //若生成的字符串没达到指定长度 继续生成 if (set.size() < length) { String value = getRandom(); set.add(value); } return set; } /** * 存放在set中的字符组拼接成字符串 * @param set * @return */ private static String printSet(Set set){ //打印set的方法 Iterator iterator = set.iterator(); String value = ""; while (iterator.hasNext()) { //String ele = (String) iterator.next(); value += (String)iterator.next(); } return value; } /** * 返回生成的随机字符串 * @param length 指定随机字符串长度 * @return 指定长度 大于零 返回指定长度随机字符，小于等于零 返回null */ public static String getRandonString(int length){ String value= ""; if (length > 0) { //如果返回的字符串小于指定长度 重新生成 if (value.length() < length) { Set<String> store = getStrAndNum(length); value = printSet(store); } return value; }else{ return value; } } private static Color getRandColor(int fc, int bc) { if (fc > 255){ fc = 255; } if (bc > 255){ bc = 255; } 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); } private static int getRandomIntColor() { int[] rgb = getRandomRgb(); int color = 0; for (int c : rgb) { color = color << 8; color = color | c; } return color; } private static int[] getRandomRgb() { int[] rgb = new int[3]; for (int i = 0; i < 3; i++) { rgb[i] = random.nextInt(255); } return rgb; } private static void shear(Graphics g, int w1, int h1, Color color) { shearX(g, w1, h1, color); shearY(g, w1, h1, color); } private static void shearX(Graphics g, int w1, int h1, Color color) { int period = random.nextInt(2); boolean borderGap = true; int frames = 1; int phase = random.nextInt(2); for (int i = 0; i < h1; i++) { double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames); g.copyArea(0, i, w1, 1, (int) d, 0); if (borderGap) { g.setColor(color); g.drawLine((int) d, i, 0, i); g.drawLine((int) d + w1, i, w1, i); } } } private static void shearY(Graphics g, int w1, int h1, Color color) { int period = random.nextInt(40) + 10; // 50; boolean borderGap = true; int frames = 20; int phase = 7; for (int i = 0; i < w1; i++) { double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames); g.copyArea(i, 0, 1, h1, 0, (int) d); if (borderGap) { g.setColor(color); g.drawLine(i, (int) d, i, 0); g.drawLine(i, (int) d + h1, i, h1); } } } }controller
@RequestMapping(value = "/imgs",method = RequestMethod.GET) public void authImage(HttpServletRequest request, HttpServletResponse response) throws IOException { response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); response.setContentType("image/jpeg"); // 生成随机大写字串 String verifyCode = VerificationUtil.generateVerifyCode(4); // 存入会话session HttpSession session = request.getSession(true); // 删除以前的 session.removeAttribute("verCode"); session.removeAttribute("codeTime"); session.setAttribute("verCode", verifyCode.toLowerCase()); session.setAttribute("codeTime", new Date()); // 生成图片 int w = 100, h = 30; OutputStream out = response.getOutputStream(); VerificationUtil.outputImage(w, h, out, verifyCode); }前端html
<%@page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %> <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <base href="<%=basePath%>"><!-- 配置页面基准路径 --> <meta charset="UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>登陆</title> </head> <body class="login-bg"> <div class="tips-toast" ></div> <!-- container --> <div class="loginBox"> <div class="login-box"> <div class="row"> <form role="form" action="login.html" method="post" class="login-form" id="defaultForm"> <div class="form-group"> <input type="text" name="username" placeholder="请输入账号" class="form-username form-control" id="form-username"> </div> <div class="form-group"> <input type="password" name="password" placeholder="请输入密码" class="form-password form-control" id="form-password" /> </div> <div class="form-group form-block" > <div class="col-md-6 remove-padding"> <input type="text" name="validateCode" placeholder="验证码" class="form-control" id="form-code"> </div> <div class="col-md-6 remove-padding border"> <span class="code-img"><img id="img" src="static/images/index/login-code.png"/></span> </div> </div> <div class="form-group form-block" > <div class="col-md-6 remove-padding remember" > <input type="checkbox" class="remember-check" /> 记住我 </div> <div class="col-md-6 remove-padding border text-right"> <a href="forget_password.html">忘记密码?</a> </div> </div> <button id="validateBtn" type="button" class="btn btn-primary btn-form">登录</button> </form> </div> </div> </div> <script> $(function(){ setTimeout(getImg(),50); }) $('.code-img').click(function () { getImg(); }); function getImg(){ var img = document.getElementById("img"); img.src = "/code/imgs?date=" + new Date().valueOf();//直接使用new Date()会导致ie内核的浏览器无法加载验证码 } </script> </body> </html>作者：94340634 来源： 原文：https://blog.csdn.net/qq_25598453/article/details/85991358 版权声明：本文原创作者94340634，转载请附上博文链接！
