HttpClientUitl工具类

public class HttpClient {

   private CloseableHttpClient httpClient;

   public HttpClient() {
      this.httpClient = HttpClients.createDefault();
   }

   /**
    * 带参数的get请求
    * 
    * @param url
    * @param map
    * @return
    * @throws Exception
    */
   public HttpResult doGet(String url, Map<String, Object> map) throws Exception {
      URIBuilder uriBuilder = new URIBuilder(url);
      if (map != null) {
         for (Map.Entry<String, Object> entry : map.entrySet()) {
            uriBuilder.setParameter(entry.getKey(), entry.getValue().toString());
         }
      }
      HttpGet httpGet = new HttpGet(uriBuilder.build());
      CloseableHttpResponse response = this.httpClient.execute(httpGet);
      HttpResult httpResult = null;
      if (response.getEntity() != null) {
         httpResult = new HttpResult(response.getStatusLine().getStatusCode(),
               EntityUtils.toString(response.getEntity(), "UTF-8"));
      } else {
         httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
      }
      return httpResult;
   }

   /**
    * 不带参数的get请求
    * 
    * @param url
    * @return
    * @throws Exception
    */
   public HttpResult doGet(String url) throws Exception {
      HttpResult httpResult = this.doGet(url, null);
      return httpResult;
   }

   /**
    * 带参数的post请求
    * 
    * @param url
    * @param map
    * @return
    * @throws Exception
    */
   public HttpResult doPost(String url, Map<String, Object> map) throws Exception {
      HttpPost httpPost = new HttpPost(url);
      if (map != null) {
         List<NameValuePair> params = new ArrayList<NameValuePair>();
         for (Map.Entry<String, Object> entry : map.entrySet()) {
            params.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
         }
         UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params, "UTF-8");
         httpPost.setEntity(formEntity);
      }
      CloseableHttpResponse response = this.httpClient.execute(httpPost);
      HttpResult httpResult = null;
      if (response.getEntity() != null) {
         httpResult = new HttpResult(response.getStatusLine().getStatusCode(),
               EntityUtils.toString(response.getEntity(), "UTF-8"));
      } else {
         httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
      }
      return httpResult;
   }

   /**
    * 不带参数的post请求
    * 
    * @param url
    * @return
    * @throws Exception
    */
   public HttpResult doPost(String url) throws Exception {
      HttpResult httpResult = this.doPost(url, null);
      return httpResult;
   }

   /**
    * 带参数的Put请求
    * 
    * @param url
    * @param map
    * @return
    * @throws Exception
    */
   public HttpResult doPut(String url, Map<String, Object> map) throws Exception {
      HttpPut httpPut = new HttpPut(url);
      if (map != null) {
         List<NameValuePair> params = new ArrayList<NameValuePair>();
         for (Map.Entry<String, Object> entry : map.entrySet()) {
            params.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
         }
         UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params, "UTF-8");
         httpPut.setEntity(formEntity);
      }
      CloseableHttpResponse response = this.httpClient.execute(httpPut);
      HttpResult httpResult = null;
      if (response.getEntity() != null) {
         httpResult = new HttpResult(response.getStatusLine().getStatusCode(),
               EntityUtils.toString(response.getEntity(), "UTF-8"));
      } else {
         httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
      }
      return httpResult;
   }

   /**
    * 带参数的Delete请求
    * 
    * @param url
    * @param map
    * @return
    * @throws Exception
    */
   public HttpResult doDelete(String url, Map<String, Object> map) throws Exception {
      URIBuilder uriBuilder = new URIBuilder(url);
      if (map != null) {
         for (Map.Entry<String, Object> entry : map.entrySet()) {
            uriBuilder.setParameter(entry.getKey(), entry.getValue().toString());
         }
      }
      HttpDelete httpDelete = new HttpDelete(uriBuilder.build());
      CloseableHttpResponse response = this.httpClient.execute(httpDelete);
      HttpResult httpResult = null;
      if (response.getEntity() != null) {
         httpResult = new HttpResult(response.getStatusLine().getStatusCode(),
               EntityUtils.toString(response.getEntity(), "UTF-8"));
      } else {
         httpResult = new HttpResult(response.getStatusLine().getStatusCode(), "");
      }
      return httpResult;
   }

   /**
    * post请求（用于请求json格式的参数）
    * @param url
    * @param params
    * @return
    */
   public static String doPostJson(String url, String params) throws Exception {

      CloseableHttpClient httpclient = HttpClients.createDefault();
      HttpPost httpPost = new HttpPost(url);// 创建httpPost
      httpPost.setHeader("Accept", "application/json");
      httpPost.setHeader("Content-Type", "application/json");
      String charSet = "UTF-8";
      StringEntity entity = new StringEntity(params, charSet);
      httpPost.setEntity(entity);
      CloseableHttpResponse response = null;

      try {

         response = httpclient.execute(httpPost);
         StatusLine status = response.getStatusLine();
         int state = status.getStatusCode();
         if (state == HttpStatus.SC_OK) {
            HttpEntity responseEntity = response.getEntity();
            String jsonString = EntityUtils.toString(responseEntity);
            return jsonString;
         }
         else{
            logger.error("请求返回:"+state+"("+url+")");
         }
      }
      finally {
         if (response != null) {
            try {
               response.close();
            } catch (IOException e) {
               e.printStackTrace();
            }
         }
         try {
            httpclient.close();
         } catch (IOException e) {
            e.printStackTrace();
         }
      }
      return null;
   }

}