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@ResponseBody    @RequestMapping(value = "/f")    public void getUser(Model model, HttpServletRequest request,                          HttpServletResponse response) throws IOException {        PrintWriter print;        /*         * 规则描述:         *1. 将token、timestamp、nonce三个参数进行字典序排序         *2. 将三个参数字符串拼接成一个字符串进行sha1加密         *3. 开发者获得加密后的字符串可与signature对比，标识该请求来源于微信         */	    String signature = request.getParameter("signature");	    String timestamp = request.getParameter("timestamp");	    String nonce = request.getParameter("nonce");	    String echostr = request.getParameter("echostr");	    String token = "beokwithanything";        List
   
     a = new ArrayList
    
     ();        a.add(token);        a.add(timestamp);        a.add(nonce);        Collections.sort(a);        String hashcode = DigestUtils.shaHex(a.get(0)+a.get(1)+a.get(2));        System.out.println(signature);        System.out.println(hashcode);        // 通过检验signature对请求进行校验:        // 若校验成功则原样返回 echostr，表示接入成功，否则接入失败        if (hashcode.equals(signature)){            print = response.getWriter();            print.write(echostr);            print.flush();        }    }
    
   

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