JQuery利用JSONP实现跨域请求

  话不多说了，直接上代码

第一种方式：
$.getJSON("http://localhost:7777/vc/login?jsoncallback=?",
  {
     userId:'SCMHUBIAO',tokenId:'1'
  },
  function(data){
    alert(data);
 });		 
第二种方式：
$.ajax({  
   type : "get",  
   async:false,  
   url : "http://10.9.116.235:7777/vc/login?userId=eee&tokenId=111",  
   dataType : "jsonp",//数据类型为jsonp  
   jsonp: "jsonpCallback",//服务端用于接收callback调用的function名的参数  
   success : function(data){ 
     
   }
});   

服务端代码：

 /**
     * 第三方验证
     *
     * @param userId
     * @param tokenId
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    @RequestMapping(value = "/login")
    public void login(String userId, String tokenId, HttpServletRequest request, HttpServletResponse response) throws ServletException,
            IOException {

        PrintWriter out = response.getWriter();

       SsoLoginResult ssoLoginResult = new SsoLoginResult();

        response.setContentType("application/x-json");
        //保证返回数据中的中文信息能够正常解码
        response.setCharacterEncoding("utf-8");

        ExecuteResult executeResult = this.vcUserServiceFacade.queryByUserName(userId);
        if (executeResult.isSuccess()) {
            // Http 请求参数
            Map checkParamsMap = new HashMap();
            checkParamsMap.put("userId", userId);
            checkParamsMap.put("tokenId", tokenId);

            //获取惠买token验证请求地址
            String httpUrl = ConfigUtil.getProperty("huimaiServer");

            //Map 2 JSON Object
            String params = JSONArray.toJSONString(checkParamsMap);
            String postParams = "data=" + params;

            //post请求返回值,验证TOKEN是否有效
            //	String tokenResult = HttpClientHelper.getInstance().sendHttpPost(httpUrl,postParams);
            //	fastjosn 解析
            //	JSONObject object = JSON.parseObject(tokenResult);
            //	String status = object.getString("flag");

            /*就是代表当前的用户*/
            Subject currentUser = SecurityUtils.getSubject();

            if ("1".equals("1")) {
                VendorUserDTO vendorUserDTO = executeResult.getResult();

                //创建认证令牌
                DefaultUsernamepasswordToken aShareLoginToken = new DefaultUsernamepasswordToken();
                aShareLoginToken.setUsername(vendorUserDTO.getUserName());
                aShareLoginToken.setLoginType("huimai");

                //执行登录
                currentUser.login(aShareLoginToken);

                //获取供应商门户登录跳转首页
                String url = ConfigUtil.getProperty("vendorIndex");
                ssoLoginResult.setForwardURL(url);
                ssoLoginResult.setStatus(1);
                ssoLoginResult.setSuccessMsgInfo("{" + vendorUserDTO.getUserName() + "}认证通过");
            } else {
                //ssoLoginResult.setErrorMsgInfo(":" + object.getString("msg"));
            }
        } else {
            huiMaiSsoLoginResult.setErrorMsgInfo("<用户身份验证>:" + executeResult.getErrorMessages().get(0));
        }

        //设置ajax回调函数以及返回值
        String resultJSON = JSONObject.toJSONString(huiMaiSsoLoginResult); //根据需要拼装json
        String jsonpCallback = request.getParameter("jsonpCallback");//客户端请求参数
        out.println(jsonpCallback + "(" + resultJSON + ")");//返回jsonp格式数据

        out.flush();
        out.close();
    }