java生成图片验证码(字母 | 运算 | 汉字)

逃离我推掉我的手 2022-05-03 00:58 283阅读 0赞

java生成图片验证码（字母|运算|汉字）

1.先看下以下效果图,ui请勿参考

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watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21pbmcxOTk1MTIyNA_size_27_color_FFFFFF_t_70 3watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21pbmcxOTk1MTIyNA_size_27_color_FFFFFF_t_70 4

2.后台工具类代码

  1. package com.ljm.verification.util;
  4. import java.awt.Color;
  5. import java.awt.Font;
  6. import java.awt.Graphics;
  7. import java.awt.image.BufferedImage;
  8. import java.util.Random;
  10. import javax.imageio.ImageIO;
  11. import javax.servlet.http.HttpServletRequest;
  12. import javax.servlet.http.HttpServletResponse;
  13. import javax.servlet.http.HttpSession;
  15. /**
  16.  * @author lijunming
  17.  * @date 2018/10/26 2:57 PM
  18.  */
  19. public class RandomValidateCode {
  20.     private static int width = 135;// 图片宽
  21.     private static int height = 28;// 图片高
  22.     private static int lineSize = 40;// 干扰线数量
  23.     private static Random random = new Random();
  25.     /**
  26.      * 设置验证码字体
  27.      *
  28.      * @return 字体
  29.      */
  30.     private static Font getFont() {
  31.         return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
  32.     }
  34.     /**
  35.      * 设置验证码颜色
  36.      *
  37.      * @param fc
  38.      * @param bc
  39.      * @return rgb值
  40.      */
  41.     private static Color getRandColor(int fc, int bc) {
  42.         if (fc > 255)
  43.             fc = 255;
  44.         if (bc > 255)
  45.             bc = 255;
  46.         int r = fc + random.nextInt(bc - fc - 16);
  47.         int g = fc + random.nextInt(bc - fc - 14);
  48.         int b = fc + random.nextInt(bc - fc - 18);
  49.         return new Color(r, g, b);
  50.     }
  52.     /**
  53.      * 生成随机验证码，绘制成图片，并且写入结果
  54.      *
  55.      * @param request
  56.      * @param response
  57.      */
  58.     public static void getRandcode(HttpServletRequest request,
  59.                                    HttpServletResponse response) {
  60.         HttpSession session = request.getSession();
  61.         // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
  62.         BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
  63.         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
  64.         g.fillRect(0, 0, width, height);
  65.         g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 45)); //图片上字的大小
  66.         g.setColor(getRandColor(110, 133));
  67.         // 绘制干扰线
  68.         for (int i = 0; i <= lineSize; i++) {
  69.             drowLine(g);
  70.         }
  71.         // 绘制随机验证吗
  72.         String randomString = getValidate();
  73.         //把生成的验证码存入session,并且1分钟超时失效
  74.         session.setAttribute("verification", result);
  75.         session.setMaxInactiveInterval(60);
  76.         String[] arr = randomString.toString().split("");
  77.         for (int i = 1; i <= arr.length; i++) {
  78.             drowString(g, arr[i - 1], i);
  79.         }
  80.         g.dispose();
  81.         try {
  82.             // 将内存中的图片通过流动形式输出到客户端
  83.             ImageIO.write(image, "JPEG", response.getOutputStream());
  84.         } catch (Exception e) {
  85.             e.printStackTrace();
  86.         }
  88.     }
  90.     /**
  91.      * 绘制图片
  92.      */
  93.     private static String drowString(Graphics g, String randomString, int i) {
  94.         int j = 15;
  95.         if (result instanceof Integer) {
  96.             j = 11;
  97.         }
  98.         g.setFont(getFont());
  99.         g.setColor(new Color(random.nextInt(101), random.nextInt(111), random
  100.                 .nextInt(121)));
  101.         g.translate(random.nextInt(3), random.nextInt(3));
  102.         g.translate(random.nextInt(3), random.nextInt(3));
  103.         g.drawString(randomString, j * i, 12);
  104.         return randomString;
  105.     }
  107.     /**
  108.      * 绘制干扰线
  109.      */
  110.     private static void drowLine(Graphics g) {
  111.         int x = random.nextInt(width);
  112.         int y = random.nextInt(height);
  113.         int xl = random.nextInt(13);
  114.         int yl = random.nextInt(15);
  115.         g.drawLine(x, y, x + xl, y + yl);
  116.     }
  118.     public static Object result;
  120.     /**
  121.      * 生成字母验证码
  122.      * @return 验证码的内容
  123.      */
  124.     public static String createAB() {
  125.         String[] abc = new String[]{"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "q", "r", "s", "t", "u", "v", "o", "p", "w", "x", "z", "y", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "Q", "R", "S", "T", "U", "V", "O", "P", "W", "X", "Y", "Z"};
  126.         Random rd = new Random();
  127.         int index = rd.nextInt(abc.length);
  128.         String one = abc[index];
  129.         index = rd.nextInt(abc.length);
  130.         String two = abc[index];
  131.         index = rd.nextInt(abc.length);
  132.         String three = abc[index];
  133.         index = rd.nextInt(abc.length);
  134.         String four = abc[index];
  135.         result = one + two + three + four;
  136.         String str = one + two + three + four;
  137.         return str;
  138.     }
  140.     /**
  141.      * 生成加减乘除算法验证码
  142.      * 由于2位数的 乘除对某些人算起来麻烦
  143.      * 有兴趣的可以扩展乘法和除法
  144.      * @return 验证码的内容
  145.      */
  146.     public static String createNumber() {
  147.         String fu[] = new String[]{"+", "-", "*", "/"};
  148.         Random rd = new Random();
  149.         int i = rd.nextInt(2);
  150.         int num1 = rd.nextInt(100);
  151.         int num2 = rd.nextInt(100);
  152.         if (i == 0) {
  153.             result = num1 + num2;
  154.         } else {
  155.             //循环保证永远不会出现减法结果是负数
  156.             while (num1 < num2) {
  157.                 num1 = rd.nextInt(100);
  158.             }
  159.             result = num1 - num2;
  160.         }
  161.         String str = num1 + fu[i] + num2 + "=";
  162.         return str;
  163.     }
  165.     /**
  166.      * 生产汉字验证吗
  167.      * @return 验证码的内容
  168.      */
  169.     public static String createChinese() {
  170.         String chinese[] = new String[]{
  171.                 "勿", "忘", "初", "心", "方", "得", "始", "终", "认", "真", "切", "怂", "从", "一", "而", "终", "英", "雄", "联", "盟"
  172.         };
  173.         Random rd = new Random();
  174.         int index = rd.nextInt(chinese.length);
  175.         String one = chinese[index];
  176.         index = rd.nextInt(chinese.length);
  177.         String two = chinese[index];
  178.         index = rd.nextInt(chinese.length);
  179.         String three = chinese[index];
  180.         index = rd.nextInt(chinese.length);
  181.         String four = chinese[index];
  182.         result = one + two + three + four;
  183.         String str = one + two + three + four;
  184.         return str;
  185.     }
  187.     /**
  188.      * 随机调用验证码
  189.      */
  190.     public static String getValidate() {
  191.         Random rd = new Random();
  192.         int i = rd.nextInt(4);
  193.         if (i == 1) {
  194.             return createAB();
  195.         } else if (i == 2) {
  196.             return createChinese();
  197.         }
  198.         return createNumber();
  199.     }
  200. }

3.Controller

  1. package com.ljm.verification.controller;
  3. import com.ljm.verification.util.RandomValidateCode;
  4. import org.springframework.stereotype.Controller;
  5. import org.springframework.web.bind.annotation.*;
  7. import javax.servlet.http.HttpServletRequest;
  8. import javax.servlet.http.HttpServletResponse;
  9. import javax.servlet.http.HttpSession;
  11. /**
  12.  * @author lijunming
  13.  * @date 2018/10/26 3:57 PM
  14.  */
  15. @Controller
  16. public class TestController {
  18.     /*
  19.      * 去登陆页面
  20.      */
  21.     @GetMapping("/login")
  22.     public String toLogin(){
  23.         return "login";
  24.     }
  26.     /*
  27.      * 登录页面生成验证码
  28.      */
  29.     @RequestMapping(value = "/getVerify.htm")
  30.     public void getVerify(HttpServletRequest request, HttpServletResponse response){
  31.         response.setContentType("image/jpeg");//设置相应类型,告诉浏览器输出的内容为图片
  32.         response.setHeader("Pragma", "No-cache");//设置响应头信息，告诉浏览器不要缓存此内容
  33.         response.setHeader("Cache-Control", "no-cache");
  34.         response.setDateHeader("Expire", 0);
  35.         try {
  36.             RandomValidateCode.getRandcode(request, response);//输出验证码图片方法
  37.         } catch (Exception e) {
  38.             e.printStackTrace();
  39.         }
  40.     }
  42.     /*
  43.      * 验证输入的验证码是否正确
  44.      */
  45.     @RequestMapping("/checkValidate")
  46.     @ResponseBody
  47.     public String checkValidate(@RequestParam("verification")Object yzm, HttpSession session) throws Exception{
  48.         Object result=session.getAttribute("verification");
  49.         //验证码只有1分钟的有效期，超时返回-1
  50.         if(session.getAttribute("verification")==null){
  51.             return "-1";
  52.         }
  53.         //如果为字母验证码或者    1表示通告,0表示验证失败
  54.         if(result instanceof String){
  55.             if(yzm.toString().toUpperCase().equals(result.toString().toUpperCase())){
  56.                 return "1";
  57.             }
  58.             return "0";
  59.             //如果为数字验证码
  60.         }else{
  61.             if(result.toString().equals(yzm)){
  62.                 return "1";
  63.             }
  64.         }
  65.         return "0";
  66.     }
  67. }

4.前台页面

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <title>Title</title>
  6.     <style type="text/css">
  7.          div{
  8.              text-align: center;
  9.          }
  10.         form{
  11.             margin-top:10%;
  12.         }
  13.     </style>
  14. </head>
  15. <body>
  16. <div >
  17.     <form  action="login"method="post">
  18.         <div id="error"></div>
  19.         账号:<input type="text" name="userName"/><br/>
  20.         密码:<input type="password" name="password" /><br/>
  21.         <img id="yzm" src="getVerify.htm"/> <a href="javascript:replace()">换一张</a><br/>
  22.         验证码<input type="text" name="yzm"/>
  23.         <input type="button" value="登陆" id="login"/>
  24.     </form>
  25. </div>
  26. </body>
  27. <script type="text/javascript" src="jquery-1.8.0.js"></script>
  28. <script type="text/javascript">
  29.     function replace(){
  30.         $("#yzm").attr("src","getVerify.htm?t="+ Math.random());
  31.     }
  32.     $(function(){
  33.         $("#login").click(function(){
  34.             var flags=false;
  35.             var verification=$("[name='yzm']").val();
  36.             $.ajax({
  37.                 url:"checkValidate",
  38.                 async:false,
  39.                 type:"get",
  40.                 data:{"verification":verification},
  41.                 dataType:"text",
  42.                 success:function(flag){
  43.                     if(flag=="-1"){
  44.                         $("#error").html("验证码已超时,请换个","red");
  45.                         flags=true;
  46.                     }else if (flag=="0"){
  47.                         $("#error").html("验证码错误").css("color","red");
  48.                         flags=true;
  49.                     }else{
  50.                         $("#error").html("登陆成功").css("color","green");
  51.                     }
  52.                 }
  53.             });
  54.             //如果验证失败则不进后面的登陆
  55.             if(flags){
  56.                 return;
  57.             }
  58.         });
  59.     })
  60. </script>
  61. </html>

5.由于小项目，没有用github

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