使用CloseableHttpClient 訪問 http 和https 的get請求

public class HttpClientUtil {

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

/**
     * 帶引數的get請求
     *
     * @param url
     * @param param
     * @return String
     */
    public static String doGet(String url, Map<String, String> param) {
        // 建立Httpclient物件
        CloseableHttpClient httpclient = HttpClients.createDefault();

        String resultString = "";
        CloseableHttpResponse response = null;
        try {
            // 建立uri
            URIBuilder builder = new URIBuilder(url);
            if (param != null) {
                for (String key : param.keySet()) {
                    builder.addParameter(key, param.get(key));
                }
            }
            URI uri = builder.build();
            // 建立http GET請求
            HttpGet httpGet = new HttpGet(uri);
            // 執行請求
            response = httpclient.execute(httpGet);
            // 判斷返回狀態是否為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帶引數的get請求  忽略證書
     *
     * @param url
     * @param param
     * @return String
     */
    public static String httpsDoGet(String url, Map<String, String> param) throws Exception {
        // 建立Httpclient物件
        // 建立SSL上下文，忽略證書驗證
        SSLContextBuilder sslContextBuilder = SSLContexts.custom().loadTrustMaterial((chain, authType) -> true);
        SSLConnectionSocketFactory sslSocketFactory = new SSLConnectionSocketFactory(sslContextBuilder.build(), NoopHostnameVerifier.INSTANCE);


        // 建立 CloseableHttpClient 物件
        CloseableHttpClient httpclient = HttpClients.custom()
                .setSSLSocketFactory(sslSocketFactory)
                .build();

        String resultString = "";
        CloseableHttpResponse response = null;
        try {
            // 建立uri
            URIBuilder builder = new URIBuilder(url);
            if (param != null) {
                for (String key : param.keySet()) {
                    builder.addParameter(key, param.get(key));
                }
            }
            URI uri = builder.build();
            // 建立http GET請求
            HttpGet httpGet = new HttpGet(uri);
            // 執行請求
            response = httpclient.execute(httpGet);
            // 判斷返回狀態是否為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;
    }
}