JAVA代码（GET方式）请求URL（HTTP，HTTPS）

/**
 *
 * @param url 这个只支持http地址，不支持https
 * @param request
 * @return
 */

public static String sendMessage(String url, HttpServletRequest request) {
   CloseableHttpClient httpClient = HttpClientBuilder.create().build();
   HttpGet httpGet = new HttpGet(url);  //url:请求地址 get请求
   httpGet.addHeader(HTTP.CONTENT_TYPE, "application/json;charset=UTF-8");
   try {
      HttpResponse res = httpClient.execute(httpGet);
      String rtn = EntityUtils.toString(res.getEntity());
      return rtn;
   } catch (Exception e) {
      e.printStackTrace();
   } finally {
      httpGet.releaseConnection();
   }
   return null;
}

/**
 *
 *
 * @param url  支持https格式 get请求
 * @return  返回json格式
 */

public static JSONObject getHttps(String hsUrl) {
    try {
        URL url;

        url = new URL(hsUrl);
        HttpsURLConnection con = (HttpsURLConnection) url.openConnection();
        X509TrustManager xtm = new X509TrustManager() {
            @Override
            public X509Certificate[] getAcceptedIssuers() {
                // TODO Auto-generated method stub
                return null;
            }

            @Override
            public void checkServerTrusted(X509Certificate[] arg0, String arg1)
                    throws CertificateException {
                // TODO Auto-generated method stub

            }

            @Override
            public void checkClientTrusted(X509Certificate[] arg0, String arg1)
                    throws CertificateException {
                // TODO Auto-generated method stub

            }
        };

        TrustManager[] tm = {xtm};

        SSLContext ctx = SSLContext.getInstance("TLS");
        ctx.init(null, tm, null);

        con.setSSLSocketFactory(ctx.getSocketFactory());
        con.setHostnameVerifier(new HostnameVerifier() {
            @Override
            public boolean verify(String arg0, SSLSession arg1) {
                return true;
            }
        });

        InputStream inStream = con.getInputStream();
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        while ((len = inStream.read(buffer)) != -1) {
            outStream.write(buffer, 0, len);
        }
        byte[] b = outStream.toByteArray();//网页的二进制数据
        outStream.close();
        inStream.close();
        String rtn = new String(b, "utf-8");
        if (StringUtils.isNotBlank(rtn)) {
            JSONObject object = JSONObject.fromObject(rtn);
            return object;
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}