PostMethod和HttpPost的区别

老版：PostMethod

 public class HttpTests {

     /**
      * @param args
      * @throws Exception
      */
     public static void main(String[] args) throws Exception {
         HttpClient httpclient = new HttpClient();
         PostMethod httpPost =new PostMethod("******/abc");
         NameValuePair[] param = { new NameValuePair("username", "vip")};
         httpPost.setRequestBody(param);
         httpclient.executeMethod(httpPost);
     }

 }

新版：HttpPost

	public static String getMes(String url, String params) {
		CloseableHttpClient client = HttpClients.createDefault();
		HttpPost htPost = new HttpPost(url);
		String backMes = null;
		try {
			htPost.setHeader("content-type", "application/json");
			StringEntity reqEntity = new StringEntity(params);
			htPost.setEntity(reqEntity);
			HttpResponse httpResponse = client.execute(htPost);
			HttpEntity entity = httpResponse.getEntity();
			backMes = EntityUtils.toString(entity, "UTF-8").toString();
		} catch (ClientProtocolException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			try {
				client.close();
				client = null;
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		return backMes;
	}