使用HttpClient往别人提供的接口推送json数据，并获取返回值

先将要推送的json数据进行封装

public void Pushdata() {
		JSONObject json = new JSONObject();
		//此处封装json数据

//调用工具类中的方法，传入url以及json数据进行推送
		try {
			String bd = CommonUtil.sendPut("url", json, "UTF-8");			
			JSONObject ob = JSON.parseObject(bd); //获取对方返回的数据
			//String ss = ob.getString("data");
		
		} catch (ParseException | IOException e) {
			e.printStackTrace();
		} 
	}

在pom.xml中加入依赖

		<dependency>
			<groupId>org.apache.httpcomponents</groupId>
			<artifactId>httpclient</artifactId>
			<version>4.5.7</version>
		</dependency>

		<dependency>
			<groupId>com.google.http-client</groupId>
			<artifactId>google-http-client</artifactId>
			<version>1.22.0</version>
		</dependency>

工具类中的数据推送方法

/**
	 * HttpClient 推送数据
	 * 
	 * @param url 接口地址
 	 * @param json 传入的参数 
	 * @return String 
	 */
	public static String sendPut(String url, JSONObject putData, String encoding) throws ParseException, IOException {
		String body = "";
		System.err.println(putData.toJSONString());//打印了一下我推送的json数据
		CloseableHttpResponse response = null;
		CloseableHttpClient client = HttpClients.createDefault();
		
		//向指定资源位置上传内容
		HttpPost httpPost = new HttpPost(url);
		httpPost.addHeader("Content-Type", "application/json;charset=utf-8");
		httpPost.setEntity(new StringEntity(JSONObject.toJSONString(putData)));
		try {
			response = client.execute(httpPost);
			System.err.println("status" + response.getStatusLine().getStatusCode());
			
			//通过response中的getEntity()方法获取返回值
			HttpEntity entity = response.getEntity();
			if (entity != null) {
				body = EntityUtils.toString(entity, encoding);
			}   
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
	   	} finally {
			httpPost.abort();
			if (response != null) {
				EntityUtils.consumeQuietly(response.getEntity());
			}
		}

		System.err.println("body:" + body);
		return body;
	}