关于httppost 错误处理

关于post请求中map和json的问题：如下如果将方法参数中JSONObject 换成Map会报错，

public static String post(String url,JSONObject jsonParam,Integer connTimeout,Integer readTimeout) throws Exception {    	 
        HttpPost httpPost = new HttpPost(url);
        CloseableHttpClient client = HttpClients.createDefault();    	        
        StringEntity entity = new StringEntity(jsonParam.toString(),"utf-8");//解决中文乱码问题  
     	entity.setContentEncoding("UTF-8");    
     	entity.setContentType("application/json");    
     	httpPost.setEntity(entity);
         // 设置参数
	    RequestConfig.Builder customReqConf = RequestConfig.custom();
	    if (connTimeout != null) {
	        customReqConf.setConnectTimeout(connTimeout);
	    }
	    if (readTimeout != null) {
	        customReqConf.setSocketTimeout(readTimeout);
	    }
	    httpPost.setConfig(customReqConf.build());
        HttpResponse resp = client.execute(httpPost);
	    return IOUtils.toString(resp.getEntity().getContent(), "UTF-8");
     }

即使使用如下 还是报错(JSON Parse error: Unrecognized token ')，最终淘汰掉map直接使用的jsonobject，原因不详？？？

if (map!= null && !map.isEmpty()) {
		        List formParams = new ArrayList();
		        Set> entrySet = map.entrySet();
		        for (Map.Entry entry : entrySet) {
		            formParams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
		        }
		        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams, Consts.UTF_8);
		        post.setEntity(entity);
		    }