/**   * post提交工具类   *   * @param url     访问的url   * @param map     post参数   * @param charset 编码   * @return 响应结束的返回字符串   */  public static String doPost(String url, Map<String, String> map, String charset) throws Exception {      HttpClient httpClient = null;      HttpPost httpPost = null;      String result = null;      httpPost = new HttpPost(url);      SSLContext ctx = SSLContext.getInstance("TLS");      X509TrustManager tm = new X509TrustManager() {          @Override          public void checkClientTrusted(X509Certificate[] chain,                                         String authType) throws CertificateException {          }             @Override          public void checkServerTrusted(X509Certificate[] chain,                                         String authType) throws CertificateException {          }             @Override          public X509Certificate[] getAcceptedIssuers() {              return null;          }      };      ctx.init(null, new TrustManager[]{tm}, null);      SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(              ctx,              SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);      httpClient = HttpClients.custom().setSSLSocketFactory(sslsf).build();      //设置参数      List<NameValuePair> list = new ArrayList<NameValuePair>();      Iterator iterator = map.entrySet().iterator();      while (iterator.hasNext()) {          Entry<String, String> elem = (Entry<String, String>) iterator.next();          list.add(new BasicNameValuePair(elem.getKey(), elem.getValue()));      }      if (list.size() > 0) {          UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, charset);          httpPost.setEntity(entity);      }      HttpResponse response = httpClient.execute(httpPost);      if (response != null) {          HttpEntity resEntity = response.getEntity();          if (resEntity != null) {              result = EntityUtils.toString(resEntity, charset);          }      }      return result;     }