验证码生成器

package ease.shopping.util; import java.awt.Color;  import java.awt.Font;  import java.awt.Graphics;  import java.awt.image.BufferedImage;  import java.util.Random;    /**  * 验证码生成器  * @see --------------------------------------------------------------------------------------------------------------  * @see 可生成数字、大写、小写字母及三者混合类型的验证码  * @see 支持自定义验证码字符数量,支持自定义验证码图片的大小,支持自定义需排除的特殊字符,支持自定义干扰线的数量,支持自定义验证码图文颜色  * @see --------------------------------------------------------------------------------------------------------------  * @see 另外,给Shiro加入验证码有多种方式,也可以通过继承修改FormAuthenticationFilter类,通过Shiro去验证验证码  * @see 而这里既然使用了SpringMVC,也为了简化操作,就使用此工具生成验证码,并在Controller中处理验证码的校验  * @see --------------------------------------------------------------------------------------------------------------  * @create Sep 29, 2013 4:23:13 PM  * @author 玄玉
    
       */  public class VerifyCodeUtil {      /**      * 验证码类型为仅数字,即0~9      */      public static final int TYPE_NUM_ONLY = 0;        /**      * 验证码类型为仅字母,即大小写字母混合      */      public static final int TYPE_LETTER_ONLY = 1;        /**      * 验证码类型为数字和大小写字母混合      */      public static final int TYPE_ALL_MIXED = 2;        /**      * 验证码类型为数字和大写字母混合      */      public static final int TYPE_NUM_UPPER = 3;        /**      * 验证码类型为数字和小写字母混合      */      public static final int TYPE_NUM_LOWER = 4;        /**      * 验证码类型为仅大写字母      */      public static final int TYPE_UPPER_ONLY = 5;        /**      * 验证码类型为仅小写字母      */      public static final int TYPE_LOWER_ONLY = 6;        private VerifyCodeUtil(){}            /**      * 生成随机颜色      */      private static Color generateRandomColor() {          Random random = new Random();          return new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255));      }                  /**      * 生成图片验证码      * @param type           验证码类型,参见本类的静态属性      * @param length         验证码字符长度,要求大于0的整数      * @param excludeString  需排除的特殊字符      * @param width          图片宽度(注意此宽度若过小,容易造成验证码文本显示不全,如4个字符的文本可使用85到90的宽度)      * @param height         图片高度      * @param interLine      图片中干扰线的条数      * @param randomLocation 每个字符的高低位置是否随机      * @param backColor      图片颜色,若为null则表示采用随机颜色      * @param foreColor      字体颜色,若为null则表示采用随机颜色      * @param lineColor      干扰线颜色,若为null则表示采用随机颜色      * @return 图片缓存对象      */      public static BufferedImage generateImageCode(int type, int length, String excludeString, int width, int height, int interLine, boolean randomLocation, Color backColor, Color foreColor, Color lineColor){          String textCode = generateTextCode(type, length, excludeString);          return generateImageCode(textCode, width, height, interLine, randomLocation, backColor, foreColor, lineColor);      }              /**      * 生成验证码字符串      * @param type          验证码类型,参见本类的静态属性      * @param length        验证码长度,要求大于0的整数      * @param excludeString 需排除的特殊字符（无需排除则为null）      * @return 验证码字符串      */      public static String generateTextCode(int type, int length, String excludeString){          if(length <= 0){              return "";          }          StringBuffer verifyCode = new StringBuffer();          int i = 0;          Random random = new Random();          switch(type){              case TYPE_NUM_ONLY:                  while(i < length){                      int t = random.nextInt(10);                      //排除特殊字符                      if(null==excludeString || excludeString.indexOf(t+"")<0) {                          verifyCode.append(t);                          i++;                      }                  }              break;              case TYPE_LETTER_ONLY:                  while(i < length){                      int t = random.nextInt(123);                      if((t>=97 || (t>=65&&t<=90)) && (null==excludeString||excludeString.indexOf((char)t)<0)){                          verifyCode.append((char)t);                          i++;                      }                  }              break;              case TYPE_ALL_MIXED:                  while(i < length){                      int t = random.nextInt(123);                      if((t>=97 || (t>=65&&t<=90) || (t>=48&&t<=57)) && (null==excludeString||excludeString.indexOf((char)t)<0)){                          verifyCode.append((char)t);                          i++;                      }                  }              break;              case TYPE_NUM_UPPER:                  while(i < length){                      int t = random.nextInt(91);                      if((t>=65 || (t>=48&&t<=57)) && (null==excludeString || excludeString.indexOf((char)t)<0)){                          verifyCode.append((char)t);                          i++;                      }                  }              break;              case TYPE_NUM_LOWER:                  while(i < length){                      int t = random.nextInt(123);                      if((t>=97 || (t>=48&&t<=57)) && (null==excludeString || excludeString.indexOf((char)t)<0)){                          verifyCode.append((char)t);                          i++;                      }                  }              break;              case TYPE_UPPER_ONLY:                  while(i < length){                      int t = random.nextInt(91);                      if((t >= 65) && (null==excludeString||excludeString.indexOf((char)t)<0)){                          verifyCode.append((char)t);                          i++;                      }                  }              break;              case TYPE_LOWER_ONLY:                  while(i < length){                      int t = random.nextInt(123);                      if((t>=97) && (null==excludeString||excludeString.indexOf((char)t)<0)){                          verifyCode.append((char)t);                          i++;                      }                  }              break;          }          return verifyCode.toString();      }        /**      * 已有验证码,生成验证码图片      * @param textCode       文本验证码      * @param width          图片宽度(注意此宽度若过小,容易造成验证码文本显示不全,如4个字符的文本可使用85到90的宽度)      * @param height         图片高度      * @param interLine      图片中干扰线的条数      * @param randomLocation 每个字符的高低位置是否随机      * @param backColor      图片颜色,若为null则表示采用随机颜色      * @param foreColor      字体颜色,若为null则表示采用随机颜色      * @param lineColor      干扰线颜色,若为null则表示采用随机颜色      * @return 图片缓存对象      */      public static BufferedImage generateImageCode(String textCode, int width, int height, int interLine, boolean randomLocation, Color backColor, Color foreColor, Color lineColor){          //创建内存图像          BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);          //获取图形上下文          Graphics graphics = bufferedImage.getGraphics();          //画背景图          graphics.setColor(null==backColor ? generateRandomColor() : backColor);          graphics.fillRect(0, 0, width, height);          //画干扰线          Random random = new Random();          if(interLine > 0){              int x = 0, y = 0, x1 = width, y1 = 0;              for(int i=0; i
    

控制类

/**          * 获取验证码图片和文本(验证码文本会保存在HttpSession中)          */          /**         * 验证码生成类         * @param request         * @param response         * @throws IOException         */        @RequestMapping("getVerifyCodeImage")          public void getVerifyCodeImage(HttpServletRequest request, HttpServletResponse response) throws IOException {              //设置页面不缓存              response.setHeader("Pragma", "no-cache");              response.setHeader("Cache-Control", "no-cache");              response.setDateHeader("Expires", 0);              String verifyCode = VerifyCodeUtil.generateTextCode(VerifyCodeUtil.TYPE_NUM_ONLY, 4, null);              //将验证码放到HttpSession里面              request.getSession().setAttribute("verifyCode", verifyCode);             logging.info("本次生成的验证码为[" + verifyCode + "],已存放到HttpSession中");              //设置输出的内容的类型为JPEG图像              response.setContentType("image/jpeg");            BufferedImage bufferedImage = VerifyCodeUtil.generateImageCode(verifyCode, 90, 30, 3, true, Color.WHITE, Color.BLACK, null);              //写给浏览器              ImageIO.write(bufferedImage, "JPEG", response.getOutputStream());          }

页面引用

 
    
                             
     
      刷新验证码
      
      
function updateImg(){    $("#code").attr("src",'../getVerifyCodeImage?i='+Math.random());}