Post方法 传递json及返回json

public static String send(String url, com.alibaba.fastjson.JSONObject jsonObj,String encoding) throws ParseException, IOException{
	        String body = "";
	  
	        //创建httpclient对象
	        CloseableHttpClient client = HttpClients.createDefault();
	        //创建post方式请求对象
	        HttpPost httpPost = new HttpPost(url);
	  
	        //装填参数
	        StringEntity s = new StringEntity("["+jsonObj+"]", "utf-8");
	        s.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,
	                "application/json"));
	        //设置参数到请求对象中
	        httpPost.setEntity(s);
	        System.out.println("请求地址："+url);
//	        System.out.println("请求参数："+nvps.toString());
	  
	        //设置header信息
	        //指定报文头【Content-type】、【User-Agent】
//	        httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
	        httpPost.setHeader("Content-type", "application/json");
	        httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
	  
	        //执行请求操作，并拿到结果（同步阻塞）
	        CloseableHttpResponse response = client.execute(httpPost);
	        //获取结果实体
	        HttpEntity entity = response.getEntity();
	        if (entity != null) {
	            //按指定编码转换结果实体为String类型
	            body = EntityUtils.toString(entity, encoding);
	        }
	        EntityUtils.consume(entity);
	        //释放链接
	        response.close();
	        return body;
	    }
}

/System.out.println(TestDB.send(url0,jsonObj,"utf-8"));