今天遇到一个接口调用的问题，我在调用这个接口的时候一直报502的错误，后来发现这个接口是https的请求，必须要跳过ssl认证才能访问，下面做一下记录：
1.封装跳过ssl认证的方法 /** * 忽略ssl认证方法 * @throws Exception */ public static void ignoreSsl() throws Exception { HostnameVerifier hv = (urlHostName, session) -> { System.out.println("Warning: URL Host: " + urlHostName + " vs. " + session.getPeerHost()); return true; }; trustAllHttpsCertificates(); HttpsURLConnection.setDefaultHostnameVerifier(hv); } /** * 信任所有,创建SSLContext对象，并使用我们指定的信任管理器初始化 * @throws Exception */ private static void trustAllHttpsCertificates() throws Exception { TrustManager[] trustAllCerts = new TrustManager[1]; TrustManager tm = new MyX509TrustManager(); trustAllCerts[0] = tm; SSLContext sc = SSLContext.getInstance("SSL"); sc.init(null, trustAllCerts, null); System.setProperty("https.protocols", "TLSv1.2,TLSv1.1,SSLv3"); HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory()); } /** * 在JSSE中，实现证书信任管理器X509TrustManager接口，让它信任我们指定的证书 */ static class MyX509TrustManager implements X509TrustManager { /** * 返回受信任的X509证书数组 * @return */ @Override public X509Certificate[] getAcceptedIssuers() { return null; } /** * 该方法检查服务端的证书，若不信任该证书则抛出异常 * @param certs * @param authType * @throws CertificateException */ @Override public void checkServerTrusted(X509Certificate[] certs, String authType) throws CertificateException { } /** * 该方法检查客户端的证书，若不信任该证书则抛出异常 * @param certs * @param authType * @throws CertificateException */ @Override public void checkClientTrusted(X509Certificate[] certs, String authType) throws CertificateException { } } 2.调用接口并把响应结果以json对象的方式返回 public JSONObject restTemplateTransferFile(String imgUrlStr){ final String url = "https://localhost:10111"; RestTemplate restTemplate = new RestTemplate(); // 设置请求头 HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.valueOf(MediaType.MULTIPART_FORM_DATA_VALUE)); // 设置请求体，注意是LinkedMultiValueMap MultiValueMap<String, Object> form = new LinkedMultiValueMap<>(); form.add("interface",5); form.add("business","csig_cloud_video_str"); byte[] b=null; try { URL imgUrl = new URL(imgUrlStr); HttpURLConnection conn = (HttpURLConnection) imgUrl.openConnection(); conn.setRequestMethod("GET"); conn.setConnectTimeout(10 * 1000); // 通过输入流获取图片数据 InputStream inStream = conn.getInputStream(); // 得到图片的二进制数据 b = readInputStream(inStream); } catch (Exception e) { return new JSONObject(); }// BASE64Encoder encoder = new BASE64Encoder();// String str = encoder.encode(b); form.add("myfile",b); // 用HttpEntity封装整个请求报文 HttpEntity<MultiValueMap<String, Object>> files = new HttpEntity<>(form, headers); try { URL realUrl = new URL(url); if ("https".equalsIgnoreCase(realUrl.getProtocol())) { try { RestOcrUtil.ignoreSsl(); } catch (Exception e) { e.printStackTrace(); } } } catch (MalformedURLException e) { e.printStackTrace(); } restTemplate.getMessageConverters().set(1, new StringHttpMessageConverter(StandardCharsets.UTF_8)); String s = restTemplate.postForObject(url, files, String.class); return JSONObject.parseObject(s); } 3.其中有一个远程访问图片并转成二进制数据的需求 /** * 把流转换成二进制数据 * @param inStream * @return * @throws Exception */ public static byte[] readInputStream(InputStream inStream) throws Exception { ByteArrayOutputStream outStream = new ByteArrayOutputStream(); byte[] buffer = new byte[10*1024]; int len = 0; while ((len = inStream.read(buffer)) != -1) { outStream.write(buffer, 0, len); } inStream.close(); return outStream.toByteArray(); }更多详细内容见：https://blog.csdn.net/paradise003/article/details/72876153