使用CloseableHttpClient 访问 http 和https 的get请求

public class HttpClientUtil {

private static Logger logger = LoggerFactory.getLogger(HttpClientUtil.class);

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<br>/**      * 带参数的get请求      *      * @param url      * @param param      * @return String      */     public static String doGet(String url, Map<String, String> param) {         // 创建Httpclient对象         CloseableHttpClient httpclient = HttpClients.createDefault();           String resultString = "";         CloseableHttpResponse response = null;         try {             // 创建uri             URIBuilder builder = new URIBuilder(url);             if (param != null) {                 for (String key : param.keySet()) {                     builder.addParameter(key, param.get(key));                 }             }             URI uri = builder.build();             // 创建http GET请求             HttpGet httpGet = new HttpGet(uri);             // 执行请求             response = httpclient.execute(httpGet);             // 判断返回状态是否为200             if (response.getStatusLine().getStatusCode() == 200) {                 resultString = EntityUtils.toString(response.getEntity(), "UTF-8");             }         } catch (Exception e) {             e.printStackTrace();         } finally {             try {                 if (response != null) {                     response.close();                 }                 httpclient.close();             } catch (IOException e) {                 e.printStackTrace();             }         }         return resultString;     }       /**      * https带参数的get请求  忽略证书      *      * @param url      * @param param      * @return String      */     public static String httpsDoGet(String url, Map<String, String> param) throws Exception {         // 创建Httpclient对象         // 创建SSL上下文，忽略证书验证         SSLContextBuilder sslContextBuilder = SSLContexts.custom().loadTrustMaterial((chain, authType) -> true);         SSLConnectionSocketFactory sslSocketFactory = new SSLConnectionSocketFactory(sslContextBuilder.build(), NoopHostnameVerifier.INSTANCE);             // 创建 CloseableHttpClient 对象         CloseableHttpClient httpclient = HttpClients.custom()                 .setSSLSocketFactory(sslSocketFactory)                 .build();           String resultString = "";         CloseableHttpResponse response = null;         try {             // 创建uri             URIBuilder builder = new URIBuilder(url);             if (param != null) {                 for (String key : param.keySet()) {                     builder.addParameter(key, param.get(key));                 }             }             URI uri = builder.build();             // 创建http GET请求             HttpGet httpGet = new HttpGet(uri);             // 执行请求             response = httpclient.execute(httpGet);             // 判断返回状态是否为200             if (response.getStatusLine().getStatusCode() == 200) {                 resultString = EntityUtils.toString(response.getEntity(), "UTF-8");             }         } catch (Exception e) {             e.printStackTrace();         } finally {             try {                 if (response != null) {                     response.close();                 }                 httpclient.close();             } catch (IOException e) {                 e.printStackTrace();             }         }         return resultString;     }<br>}