使用json方式POST提交

如标题所示，这是一个方法 :-)

	/**
	 * json参数方式POST提交
	 *
	 * @param url需要访问的路径
	 * @param params传入的json格式的参数
	 * @return
	 */
	public static String doPostJson(String url, JSONObject params) {
		String strResult = "";
		// 1. 获取默认的client实例
		CloseableHttpClient client = HttpClients.createDefault();
		// 2. 创建httppost实例
		HttpPost httpPost = new HttpPost(url);
		httpPost.addHeader("Content-Type", "application/json;charset=utf-8"); //添加请求头
		try {
			httpPost.setEntity(new StringEntity(params.toJSONString(), "utf-8"));
			CloseableHttpResponse resp = client.execute(httpPost);
			try {
				// 7. 获取响应entity
				HttpEntity respEntity = resp.getEntity();
				strResult = EntityUtils.toString(respEntity, "UTF-8");
			} finally {
				resp.close();
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				client.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return strResult;
	}