经验首页 前端设计 程序设计 Java相关 移动开发 数据库/运维 软件/图像 大数据/云计算 其他经验
当前位置：技术经验 » Java相关 » Spring Boot » 查看文章
spring boot实现验证码功能
来源：jb51　　时间：2019/7/18 8:36:49　　对本文有异议

本文实例为大家分享了spring boot实现验证码功能的具体代码，供大家参考，具体内容如下

流程是按照交互顺序。

1.controller层代码，获取验证码，以及生成验证码图片。

1.1获取html

  1. @RequestMapping(value="/authImage",method=RequestMethod.GET)
  2.   public String authImage(){
  3.   return "authImage";
  4.   }

1.2 html

  1. <!DOCTYPE html>
  2. <html>
  3.  
  4.  <head>
  5.   <title>验证码</title>
  6.  </head>
  7.  <body>
  8.  <table>
  9.  <tr>
  10.  <td nowrap width="437"></td>
  11.   <td>
  12.    <img id="img" src="/image" />
  13.    <a href='#' οnclick="javascript:changeImg()" style="color:white;"><label style="color:black;">看不清？</label></a>
  14.   </td>
  15.  </tr>
  16.  </table>
  17.  <!-- 触发JS刷新-->
  18.  <script type="text/javascript">
  19.  function changeImg(){
  20.   var img = document.getElementById("img"); 
  21.   img.src = "/image?date=" + new Date();
  22.  }
  23. </script>
  24. </body>
  25. </html>

1.3.获取验证码图片

  1. @RequestMapping(value="/getImage",method=RequestMethod.GET)
  2.   public void authImage(HttpServletRequest request, HttpServletResponse response) throws IOException {
  3.  response.setHeader("Pragma", "No-cache");
  4.  response.setHeader("Cache-Control", "no-cache");
  5.  response.setDateHeader("Expires", 0);
  6.  response.setContentType("image/jpeg");
  7.  // 生成随机字串
  8.  String verifyCode = VerifyCodeUtils.generateVerifyCode(4);
  9.  // 存入会话session
  10.  HttpSession session = request.getSession(true);
  11.  // 删除以前的
  12.  session.removeAttribute("verCode");
  13.  session.removeAttribute("codeTime");
  14.  session.setAttribute("verCode", verifyCode.toLowerCase());
  15.  session.setAttribute("codeTime", LocalDateTime.now());
  16.  // 生成图片
  17.  int w = 100, h = 30;
  18.  OutputStream out = response.getOutputStream();
  19.  VerifyCodeUtils.outputImage(w, h, out, verifyCode);
  20.   }

1.4 核对验证码 

  1.  @RequestMapping(value="validImage",method=RequestMethod.GET)
  2.   public String validImage(HttpServletRequest request,HttpSession session){
  3.   String code = request.getParameter("code");
  4.   Object verCode = session.getAttribute("verCode");
  5.   if (null == verCode) {
  6.   request.setAttribute("errmsg", "验证码已失效，请重新输入");
  7.   return "验证码已失效，请重新输入";
  8.   }
  9.   String verCodeStr = verCode.toString();
  10.   LocalDateTime localDateTime = (LocalDateTime)session.getAttribute("codeTime");
  11.   long past = localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
  12.   long now = LocalDateTime.now().atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
  13.   if(verCodeStr == null || code == null || code.isEmpty() || !verCodeStr.equalsIgnoreCase(code)){
  14.   request.setAttribute("errmsg", "验证码错误");
  15.   return "验证码错误";
  16.   } else if((now-past)/1000/60>5){
  17.   request.setAttribute("errmsg", "验证码已过期，重新获取");
  18.   return "验证码已过期，重新获取";
  19.   } else {
  20.   //验证成功，删除存储的验证码
  21.   session.removeAttribute("verCode");
  22.   return "200";
  23.   }
  24.   }

2、VerifyCodeUtils的工具类

  1. package com.example.springboot.demo.util.varcode;
  2.  
  3. import java.awt.Color;
  4. import java.awt.Font;
  5. import java.awt.Graphics;
  6. import java.awt.Graphics2D;
  7. import java.awt.RenderingHints;
  8. import java.awt.geom.AffineTransform;
  9. import java.awt.image.BufferedImage;
  10. import java.io.File;
  11. import java.io.FileOutputStream;
  12. import java.io.IOException;
  13. import java.io.OutputStream;
  14. import java.util.Arrays;
  15. import java.util.Random;
  16.  
  17. import javax.imageio.ImageIO;
  18.  
  19. public class VerifyCodeUtils{
  20.  
  21.  //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
  22.  public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";
  23.  private static Random random = new Random();
  24.  
  25.  
  26.  /**
  27.   * 使用系统默认字符源生成验证码
  28.   * @param verifySize 验证码长度
  29.   * @return
  30.   */
  31.  public static String generateVerifyCode(int verifySize){
  32.   return generateVerifyCode(verifySize, VERIFY_CODES);
  33.  }
  34.  /**
  35.   * 使用指定源生成验证码
  36.   * @param verifySize 验证码长度
  37.   * @param sources 验证码字符源
  38.   * @return
  39.   */
  40.  public static String generateVerifyCode(int verifySize, String sources){
  41.   if(sources == null || sources.length() == 0){
  42.    sources = VERIFY_CODES;
  43.   }
  44.   int codesLen = sources.length();
  45.   Random rand = new Random(System.currentTimeMillis());
  46.   StringBuilder verifyCode = new StringBuilder(verifySize);
  47.   for(int i = 0; i < verifySize; i++){
  48.    verifyCode.append(sources.charAt(rand.nextInt(codesLen-1)));
  49.   }
  50.   return verifyCode.toString();
  51.  }
  52.   
  53.  /**
  54.   * 生成随机验证码文件,并返回验证码值
  55.   * @param w
  56.   * @param h
  57.   * @param outputFile
  58.   * @param verifySize
  59.   * @return
  60.   * @throws IOException
  61.   */
  62.  public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{
  63.   String verifyCode = generateVerifyCode(verifySize);
  64.   outputImage(w, h, outputFile, verifyCode);
  65.   return verifyCode;
  66.  }
  67.   
  68.  /**
  69.   * 输出随机验证码图片流,并返回验证码值
  70.   * @param w
  71.   * @param h
  72.   * @param os
  73.   * @param verifySize
  74.   * @return
  75.   * @throws IOException
  76.   */
  77.  public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{
  78.   String verifyCode = generateVerifyCode(verifySize);
  79.   outputImage(w, h, os, verifyCode);
  80.   return verifyCode;
  81.  }
  82.   
  83.  /**
  84.   * 生成指定验证码图像文件
  85.   * @param w 
  86.   * @param h
  87.   * @param outputFile
  88.   * @param code
  89.   * @throws IOException
  90.   */
  91.  public static void outputImage(int w, int h, File outputFile, String code) throws IOException{
  92.   if(outputFile == null){
  93.    return;
  94.   }
  95.   File dir = outputFile.getParentFile();
  96.   if(!dir.exists()){
  97.    dir.mkdirs();
  98.   }
  99.   try{
  100.    outputFile.createNewFile();
  101.    FileOutputStream fos = new FileOutputStream(outputFile);
  102.    outputImage(w, h, fos, code);
  103.    fos.close();
  104.   } catch(IOException e){
  105.    throw e;
  106.   }
  107.  }
  108.   
  109.  /**
  110.   * 输出指定验证码图片流
  111.   * @param w
  112.   * @param h
  113.   * @param os
  114.   * @param code
  115.   * @throws IOException
  116.   */
  117.  public static void outputImage(int w, int h, OutputStream os, String code) throws IOException{
  118.   int verifySize = code.length();
  119.   BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
  120.   Random rand = new Random();
  121.   Graphics2D g2 = image.createGraphics();
  122.   g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
  123.   Color[] colors = new Color[5];
  124.   Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN,
  125.     Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,
  126.     Color.PINK, Color.YELLOW };
  127.   float[] fractions = new float[colors.length];
  128.   for(int i = 0; i < colors.length; i++){
  129.    colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
  130.    fractions[i] = rand.nextFloat();
  131.   }
  132.   Arrays.sort(fractions);
  133.    
  134.   g2.setColor(Color.GRAY);// 设置边框色
  135.   g2.fillRect(0, 0, w, h);
  136.    
  137.   Color c = getRandColor(200, 250);
  138.   g2.setColor(c);// 设置背景色
  139.   g2.fillRect(0, 2, w, h-4);
  140.    
  141.   //绘制干扰线
  142.   Random random = new Random();
  143.   g2.setColor(getRandColor(160, 200));// 设置线条的颜色
  144.   for (int i = 0; i < 20; i++) {
  145.    int x = random.nextInt(w - 1);
  146.    int y = random.nextInt(h - 1);
  147.    int xl = random.nextInt(6) + 1;
  148.    int yl = random.nextInt(12) + 1;
  149.    g2.drawLine(x, y, x + xl + 40, y + yl + 20);
  150.   }
  151.    
  152.   // 添加噪点
  153.   float yawpRate = 0.05f;// 噪声率
  154.   int area = (int) (yawpRate * w * h);
  155.   for (int i = 0; i < area; i++) {
  156.    int x = random.nextInt(w);
  157.    int y = random.nextInt(h);
  158.    int rgb = getRandomIntColor();
  159.    image.setRGB(x, y, rgb);
  160.   }
  161.    
  162.   shear(g2, w, h, c);// 使图片扭曲
  163.  
  164.   g2.setColor(getRandColor(100, 160));
  165.   int fontSize = h-4;
  166.   Font font = new Font("Algerian", Font.ITALIC, fontSize);
  167.   g2.setFont(font);
  168.   char[] chars = code.toCharArray();
  169.   for(int i = 0; i < verifySize; i++){
  170.    AffineTransform affine = new AffineTransform();
  171.    affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize/2, h/2);
  172.    g2.setTransform(affine);
  173.    g2.drawChars(chars, i, 1, ((w-10) / verifySize) * i + 5, h/2 + fontSize/2 - 10);
  174.   }
  175.    
  176.   g2.dispose();
  177.   ImageIO.write(image, "jpg", os);
  178.  }
  179.   
  180.  private static Color getRandColor(int fc, int bc) {
  181.   if (fc > 255)
  182.    fc = 255;
  183.   if (bc > 255)
  184.    bc = 255;
  185.   int r = fc + random.nextInt(bc - fc);
  186.   int g = fc + random.nextInt(bc - fc);
  187.   int b = fc + random.nextInt(bc - fc);
  188.   return new Color(r, g, b);
  189.  }
  190.   
  191.  private static int getRandomIntColor() {
  192.   int[] rgb = getRandomRgb();
  193.   int color = 0;
  194.   for (int c : rgb) {
  195.    color = color << 8;
  196.    color = color | c;
  197.   }
  198.   return color;
  199.  }
  200.   
  201.  private static int[] getRandomRgb() {
  202.   int[] rgb = new int[3];
  203.   for (int i = 0; i < 3; i++) {
  204.    rgb[i] = random.nextInt(255);
  205.   }
  206.   return rgb;
  207.  }
  208.  
  209.  private static void shear(Graphics g, int w1, int h1, Color color) {
  210.   shearX(g, w1, h1, color);
  211.   shearY(g, w1, h1, color);
  212.  }
  213.   
  214.  private static void shearX(Graphics g, int w1, int h1, Color color) {
  215.  
  216.   int period = random.nextInt(2);
  217.  
  218.   boolean borderGap = true;
  219.   int frames = 1;
  220.   int phase = random.nextInt(2);
  221.  
  222.   for (int i = 0; i < h1; i++) {
  223.    double d = (double) (period >> 1)
  224.      * Math.sin((double) i / (double) period
  225.        + (6.2831853071795862D * (double) phase)
  226.        / (double) frames);
  227.    g.copyArea(0, i, w1, 1, (int) d, 0);
  228.    if (borderGap) {
  229.     g.setColor(color);
  230.     g.drawLine((int) d, i, 0, i);
  231.     g.drawLine((int) d + w1, i, w1, i);
  232.    }
  233.   }
  234.  
  235.  }
  236.  
  237.  private static void shearY(Graphics g, int w1, int h1, Color color) {
  238.  
  239.   int period = random.nextInt(40) + 10; // 50;
  240.  
  241.   boolean borderGap = true;
  242.   int frames = 20;
  243.   int phase = 7;
  244.   for (int i = 0; i < w1; i++) {
  245.    double d = (double) (period >> 1)
  246.      * Math.sin((double) i / (double) period
  247.        + (6.2831853071795862D * (double) phase)
  248.        / (double) frames);
  249.    g.copyArea(i, 0, 1, h1, 0, (int) d);
  250.    if (borderGap) {
  251.     g.setColor(color);
  252.     g.drawLine(i, (int) d, i, 0);
  253.     g.drawLine(i, (int) d + h1, i, h1);
  254.    }
  255.  
  256.   }
  257.  
  258.  }
  259.  }
  260. }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持w3xue。

 友情链接：直通硅谷 　点职佳 　北美留学生论坛

Spring Boot热门文章

  • 史上最详 Thymeleaf 使用教程
  • Spring Boot如何通过java -jar启动
  • Spring Boot 2.x（六）：优雅的统一返回值
  • Springboot使用Logback实现日志配置与异常记录
  • 使用SpringBoot+EasyExcel+Vue实现excel表格的导入和导出详解
  • spring boot上传文件超出大小异常无法捕获问题
  • paging组件的用法和意义
  • springboot2.0集成rabbitmq的示例代码
  • Spring MVC学习step1——框架熟悉
  • spring boot ${}占位符不起作用的解决方案

    • Spring Boot推荐文章

  • 3分钟带你搞定Spring Boot中Schedule
  • 不单独部署注册中心，又要具备注册中心的功能，我能上天！
  • 从零开始学Spring Boot系列-集成Spring Security实现用户认证与授权
  • 不单独部署注册中心，又要具备注册中心的功能，咋不让我上天？
  • EasyExcel 无法读取图片？用poi写了一个工具类
  • 【进阶篇】使用 Stream 流对比两个集合的常用操作分享
  • 关于DDD和COLA的一些总结和思考
  • SnakeYaml反序列化分析
  • RestTemplate进行https请求时适配信任证书
  • Kryo反序列化链分析

    • 本站QQ群：前端 618073944 | Java 606181507 | Python 626812652 | C/C++ 612253063 | 微信 634508462 | 苹果 692586424 | C#/.net 182808419 | PHP 305140648 | 运维 608723728

    W3xue 的所有内容仅供测试，对任何法律问题及风险不承担任何责任。通过使用本站内容随之而来的风险与本站无关。
    关于我们  |  意见建议  |  捐助我们  |  报错有奖  |  广告合作、友情链接（目前9元/月）请联系QQ：27243702 沸活量
    皖ICP备17017327号-2　皖公网安备34020702000426号