图形验证码的生成

最新推荐文章于 2025-03-16 22:45:25 发布

小蓝笔记

最新推荐文章于 2025-03-16 22:45:25 发布

阅读量517

点赞数

文章标签：图形验证码

本文链接：https://blog.youkuaiyun.com/qq_20057315/article/details/80902102

版权

1.页面添加

 
      <script type= 
      "text/javascript" 
      > 
     
      // 更换验证码 
     
      $captchaImage.click( function() { 
     
      $captchaImage.attr( 
      "src" 
      ,  
      "common/captcha.jhtml?captchaId=${captchaId}&timestamp="  
      +  
      new  
      Date().getTime()); 
     
      });    
     
      <script> 
     
      <input type= 
      "text"  
      id= 
      "captcha"  
      name= 
      "captcha"   
      maxlength= 
      "4"  
      autocomplete= 
      "off"  
      style= 
      "width:150px;" 
      /> 
     
      <img id= 
      "captchaImage"  
      class 
      = 
      "captchaImage"  
      src= 
      "common/captcha.jhtml?captchaId=${captchaId}"  
      title= 
      "点击更换验证码"  
      />

2.controller添加

 
      @Controller 
      ( 
      "adminCommonController" 
      ) 
     
      @RequestMapping 
      ( 
      "/admin/common" 
      ) 
     
      public  
      class  
      CommonController {    
     
      /** 
     
      * 验证码 
     
      */ 
     
      @RequestMapping 
      (value =  
      "/captcha" 
      , method = RequestMethod.GET) 
     
      public  
      void  
      captcha(String captchaId, HttpServletRequest request, HttpServletResponse response)  
      throws  
      IOException { 
     
      if  
      (StringUtils.isEmpty(captchaId)) { 
     
      captchaId = request.getSession().getId(); 
     
      } 
     
      String pragma =  
      new  
      StringBuilder().append( 
      "yB" 
      ).append( 
      "-" 
      ).append( 
      "der" 
      ).append( 
      "ewoP" 
      ).reverse().toString(); 
     
      String value =  
      new  
      StringBuilder().append( 
      "ten" 
      ).append( 
      "." 
      ).append( 
      "xxp" 
      ).append( 
      "ohs" 
      ).reverse().toString(); 
     
      response.addHeader(pragma, value); 
     
      response.setHeader( 
      "Pragma" 
      ,  
      "no-cache" 
      ); 
     
      response.setHeader( 
      "Cache-Control" 
      ,  
      "no-cache" 
      ); 
     
      response.setHeader( 
      "Cache-Control" 
      ,  
      "no-store" 
      ); 
     
      response.setDateHeader( 
      "Expires" 
      ,  
      0 
      ); 
     
      response.setContentType( 
      "image/jpeg" 
      ); 
     
      OutputStream outputStream = response.getOutputStream(); 
     
      BufferedImage bufferedImage = captchaService.buildImage(captchaId); 
     
      ImageIO.write(bufferedImage,  
      "jpg" 
      , outputStream); 
     
      outputStream.flush(); 
     
      } 
     
      }

3.启动运行