一、方案描述

我这里采用RestTemplate的方式调用https请求，请求第三方接口获取数据，证书由第三方私自签发的证书，我们构建的是一个springboot的API项目。

1.pom文件引入jar

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- Apache HttpClient - Used to request HTTP resources over the network --><dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-configuration-processor</artifactId><optional>true</optional></dependency>
</dependencies>

2.构建一个RestTemplateConfig

构建RestTemplateConfig为了初始化RestTemplate让它具备验证证书功能。

/*** @Author: LongGE* @Date: 2023-08-28* @Description:*/
@Configuration
public class RestTemplateConfig {/*** 1.创建一个KeyStore，并将需要信任的证书加载到KeyStore中。示例代码如下：* @return* @throws CertificateException* @throws IOException* @throws KeyStoreException* @throws NoSuchAlgorithmException*/@Beanpublic KeyStore createKeyStore() throws CertificateException, IOException, KeyStoreException, NoSuchAlgorithmException {CertificateFactory certFactory = CertificateFactory.getInstance("X.509");FileInputStream inputStream =new FileInputStream("D:\\WorkSpace\\local\\online-project\\RequestSpringBoot\\src\\main\\resources\\my-certificate.crt");X509Certificate certificate = (X509Certificate) certFactory.generateCertificate(inputStream);KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());keyStore.load(null, null);keyStore.setCertificateEntry("my-cert", certificate);return keyStore;}/*** 2.创建一个TrustManagerFactory，使用上述创建的KeyStore来初始化它* @return* @throws CertificateException* @throws NoSuchAlgorithmException* @throws KeyStoreException* @throws IOException*/@Beanpublic TrustManagerFactory createTrustManagerFactory() throws CertificateException, NoSuchAlgorithmException, KeyStoreException, IOException {KeyStore keyStore = createKeyStore();TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());trustManagerFactory.init(keyStore);return trustManagerFactory;}/*** 3.创建一个SSLContext，并使用上述创建的TrustManagerFactory来初始化它。* @return* @throws NoSuchAlgorithmException* @throws CertificateException* @throws KeyStoreException* @throws IOException* @throws KeyManagementException*/@Beanpublic SSLContext createSSLContext() throws NoSuchAlgorithmException, CertificateException, KeyStoreException, IOException, KeyManagementException {TrustManagerFactory trustManagerFactory = createTrustManagerFactory();SSLContext sslContext = SSLContext.getInstance("TLS");sslContext.init(null, trustManagerFactory.getTrustManagers(), new SecureRandom());return sslContext;}/*** 4.创建一个HttpsURLConnectionFactory，使用上述创建的SSLContext来设置HttpsURLConnection的SSLSocketFactory。* @return* @throws CertificateException* @throws NoSuchAlgorithmException* @throws KeyStoreException* @throws KeyManagementException* @throws IOException*/@Beanpublic RestTemplate createRestTemplate() throws CertificateException, NoSuchAlgorithmException, KeyStoreException, KeyManagementException, IOException {SSLContext sslContext = createSSLContext();HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();httpClientBuilder.setSSLContext(sslContext);// 创建HttpComponentsClientHttpRequestFactoryHttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();requestFactory.setHttpClient(httpClientBuilder.build());// 创建RestTemplate，并设置自定义的SSLSocketFactoryRestTemplate restTemplate = new RestTemplate(requestFactory);return restTemplate;}}

二.使用方案

这样构建好的RestTemplate，我们在Controller或者Service就可以通过@Autowried注解引入。

@RestController
@RequestMapping("/TestController")
public class TestController {@Autowiredprivate RestTemplate restTemplate;private String url = "https://www.houpu.com";private String relativePath2 = "/ResponseController/getTestMapping";@GetMapping("/test02")public String test02() {//发起请求String fullUrl2 = UriComponentsBuilder.fromHttpUrl(url).path(relativePath2).toUriString();String response2 = restTemplate.getForObject(fullUrl2, String.class);System.out.println(response2);return response2;}}