java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer

很尴尬的一个错误，看程序：

controller代码:

@RequestMapping(value = "/publish",method = RequestMethod.POST,
     produces = MediaType.APPLICATION_JSON_VALUE + ";charset=utf-8")
@ResponseBody

public String paramTest(@RequestBody String param) throws Exception {
    param = URLDecoder.decode(param, "utf-8");
    JSONObject jsonObject = JSONObject.parseObject(param);
    Map<String, Object> map = jsonObject.getInnerMap();

    //title
    //content

    String newsTitle = (String) map.get("title");
    String newsContent = (String) map.get("content");
    String fileTitle;

//这是已经正确的解决办法
    int newsType = Integer.valueOf((String)map.get("newsType")) ;

    int temp = newsContent.hashCode();
    if (0 > temp) {
        fileTitle = 1 + String.valueOf(temp);
    } else {
        fileTitle = String.valueOf(temp);
    }
    System.out.println(newsTitle +" "+ newsType +" "+ fileTitle +" " + newsContent);
    return "ok";
}

请求参数是这样的：

{"title":"12345678","newsType":"1","content":"  
\n "}

如果是Map是不是就没有这个错误了？但是参数有时候就是integer的呢是不是又会报错了呢？