【JS】中ajax的URL中包含中文，后台接收乱码

【问题】
ajax提交get请求，url中参数包含中文，后台接收到显示乱码。

【解决方案】
前台：

function getSiteInfoByName(siteName){
    var res;
    $.ajax({
        url : getRootPath() + "/site/getSiteInfoByName.do?" + "siteName="
        + encodeURI(encodeURI(siteName)),
        type : "get",
        contentType : "application/json; charset=utf-8",
        dataType : "json",
        async : false,
        success : function(data) {
            res = data;
        },
        error : function(data) {
            alert("获取局点信息失败！");
            res = null;
        }
    });
    return res;
}

后台：

@RequestMapping(value = "/getSiteInfoByName.do")
    @ResponseBody
    public VSiteWithBLOBs getSiteInfoByName(@RequestParam("siteName") String siteName) {    
        logger.info("Get site int by name : {}.",siteName);    
        String site_name="";
        try {
            site_name = URLDecoder.decode(siteName, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            logger.error("decode chinese character failed :",e);
        }
        logger.info("Get site int by name : {}.",site_name);    
        return siteService.getSiteByName(site_name);
    }