java 调用发送json数据 java调用http接口post请求

java调用第三方的http post接口：
可调用接口的工具类如下：

public class HttpClientUtils{
	 public static String sendPost(String params,String url){
	        String content="";
	        try {
	            CloseableHttpClient httpClient = HttpClients.createDefault();
	            RequestConfig requestConfig = RequestConfig.custom()
	                    .setSocketTimeout(300 * 1000)
	                    .setConnectTimeout(300 * 1000)
	                    .build();
	            HttpPost post = new HttpPost(url);
	            post.setConfig(requestConfig);
	            post.setHeader("Content-Type","application/json;charset=utf-8");
	            StringEntity postingString = new StringEntity(params,
	                    "utf-8");
	            post.setEntity(postingString);
	            CloseableHttpResponse response = httpClient.execute(post);
	            content = EntityUtils.toString(response.getEntity());
	            System.out.println(content);
	        } catch (SocketTimeoutException e) {
	           e.printStackTrace();
	        } catch (Exception e) {
	           e.printStackTrace();
	        }
            return content;
	 }}