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
    
      map) throws Exception {
        URIBuilder uriBuilder = new URIBuilder(url);       if (map != null) {
           for (Map.Entry
     
       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
      
        map) throws Exception {
        HttpPost httpPost = new HttpPost(url);       if (map != null) {
           List
       
         params = new ArrayList
        
         ();          for (Map.Entry
         
           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
          
            map) throws Exception { HttpPut httpPut = new HttpPut(url); if (map != null) { List
           
             params = new ArrayList
            
             (); for (Map.Entry
             
               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
              
                map) throws Exception { URIBuilder uriBuilder = new URIBuilder(url); if (map != null) { for (Map.Entry
               
                 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; } }