/**
     * 測試微信企業號第三方應用回撥協議
     * @author:leap
     * @MethodName: testWXSaaSCallback 
     * @Description: 
     * @param req
     * @param res
     * @date:2016-8-9
     */
    @RequestMapping(value="testWXSaaSCallback")
    @ResponseBody
    public void testWXSaaSCallback( HttpServletRequest req, ServletResponse res){
        
 
//常量值
        String CORP_ID = "wx9671de0651dbdxxx";    //CorpId, 企業號的普通管理組中可檢視
        String SUITE_ID = "tja2312bedd5086xxx";    //套件ID，在套件資訊中檢視
        String SUITE_SECRET = "LGVT0BrN2DZ7VMTuIPOsudaWuXOE0iM67yHpIs1ofESS4l-jSC8LN9nOnmilhXXX";
        String SUITE_TOKEN = "ssI2AnbgOo40eb0kOxxx";
        String SUITE_ENCODING_AES_KEY 
 
= "Pmqgjzwt4yAEK9N6YZ34RKpy6onJD56r8mhCUFG9xxx";
        
        //獲取引數
        String msgSignature = req.getParameter("msg_signature");
        String timestamp = req.getParameter("timestamp");
        String nonce = req.getParameter("nonce");
        String echostr = req.getParameter("echostr");    //
 
建立套件時驗證回撥url時傳入

        String result = "";
        try {
            if(!Utils.isBlank(echostr)){    //=======驗證回撥url有效性=======
                WXBizMsgCrypt wxBizMsgCrypt = new WXBizMsgCrypt(SUITE_TOKEN, 
                        SUITE_ENCODING_AES_KEY, CORP_ID);//注意是CORP_ID
                result = wxBizMsgCrypt.VerifyURL(msgSignature, timestamp, nonce, echostr);
                System.out.println(result);
                res.getWriter().write(result);    //對echostr引數解密並原樣返回echostr明文(不能加引號，不能帶bom頭，不能帶換行符)
            }else{
                //其他操作
                res.getWriter().write("false");    
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }