不使用session,藉助redis實現驗證碼

v1.首先看一下基本的流程

v2.看一下代碼

   注:其中用到的一些工具類,能夠到個人github上去下載java

     https://github.com/hjzgg/usually_util/tree/master/utilsgit

    windows 下的 redis下載github

    https://github.com/hjzgg/redisredis

v  獲取驗證碼的tooken

@RequestMapping(value="loginCode")
    @ResponseBody
    public String getCode(){
        PrintWriter out = null;
        JSONObject jsono = new JSONObject();
        try {
       //驗證碼工具類
            ValidateCode vCode = new ValidateCode(55,25,4,80);
            String randomCode = vCode.randomCode();
            String encCode = DesUtil.strEnc(randomCode+System.currentTimeMillis(), "1", "2", "3");
            //存儲驗證碼字符串,過時時間爲1分鐘             redisTemplate.opsForValue().set(encCode, randomCode);
            redisTemplate.expire(encCode, 1, TimeUnit.MINUTES);
            //存儲驗證碼生成器,過時時間爲1分鐘 redisTemplate.opsForValue().set(encCode+"ValidateCode", SerializeUtil.serialize(vCode));
            redisTemplate.expire(encCode+"ValidateCode", 1, TimeUnit.MINUTES);
            jsono.put("success", true);
            jsono.put("message", encCode);
        } catch (Exception e) {
            e.printStackTrace();
            jsono.put("success", true);
            jsono.put("message", "inner error.");
        } finally{
            if(out != null) {
                out.flush();
                out.close();
            }
        }
        return jsono.toString();
    }

 

  本例中的tooken是經過加密生成的,加密串爲 驗證碼+當前時間。或者採用UUID生成惟一tooken,都是能夠得。生成ValidateCode(驗證碼工具類),而後將鍵值對(tooken,ValidateCode)放入redis中。json

v   獲取驗證碼圖片

@RequestMapping(value="loginCodeImage")
    public void getCodeImage(String codeAuth, HttpServletResponse response){
        if(codeAuth == null) return;
        String randomCode = (String) redisTemplate.opsForValue().get(codeAuth);
        if(randomCode == null) return;
        ValidateCode vCode = (ValidateCode)SerializeUtil.unserialize((byte[])redisTemplate.opsForValue().get(codeAuth+"ValidateCode"));
        //產生圖片         vCode.createCode(randomCode);
        if(vCode == null) return;
        // 設置響應的類型格式爲圖片格式  response.setContentType("image/jpeg");  
        //禁止圖像緩存。  response.setHeader("Pragma", "no-cache");  
        response.setHeader("Cache-Control", "no-cache");  
        response.setDateHeader("Expires", 0);  
        try {
            vCode.write(response.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }  
    }

  根據tooken,在redis中找到對應的ValidateCode(驗證碼工具類),生成驗證碼圖片。windows

v3.前臺獲取驗證碼

  網頁中獲取緩存

    <img src="htpp://......"/>app

      java中獲取dom

public static ImageIcon getCodeImage(){
        String data = JavaRequest.sendPost("loginCode", null);
        JSONObject result = JSONObject.fromObject(data);
        if((Boolean) result.get("success")){
             JavaRequest.codeAuth = result.getString("message"); ImageIcon codeImg = null;
             try{
                  codeImg = new ImageIcon(new URL(「.....」));
             } catch (Exception e) {
                 e.printStackTrace();
                 return null;
             }
             return codeImg;
        } else {
            System.out.println("獲取驗證碼圖片: " + result);
            return null;
        }
    }

  ImageIcon codeImg = JavaRequest.getCodeImage();
   if(codeImg == null){
        codeImg = new ImageIcon("獲取失敗的圖片.png");
   }
  /////////////////
   JLable codeImgLabel = new JLabel(codeImg)
相關文章
相關標籤/搜索