如何使用带有ssl证书的https客户端从Java调用API

Question

我正在使用 HttpClient 从 Java 文件调用 Rest API。通过使用它，我可以调用 http API，但不能调用 https API。

我在调用 httpsapi 时遇到以下错误。

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
        at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
        at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1946)
        at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:316)
        at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:310)
        at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1639)
        at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:223)
        at sun.security.ssl.Handshaker.processLoop(Handshaker.java:1037)
        at sun.security.ssl.Handshaker.process_record(Handshaker.java:965)
        at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1064)
        at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1367)
        at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1395)
        at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1379)

我想使用

CloseableHttpClient

调用 https API。

我有带有私钥的证书文件。 请告诉我如何使用这个私钥来调用API？

Answer 1

要使用

https

调用 API，您需要配置

SSLContext

并将其设置为您的

HttpClient

。请参阅下面的示例代码。这只是示例，您可以以不同的方式加载密钥库和信任库，例如从类路径、表单文件系统等..，进行相应的更改。

    KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());

    KeyStore identity = KeyStore.getInstance(KeyStore.getDefaultType());
    TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
    trustManagerFactory.init(trustStore);
    KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
    keyManagerFactory.init(identity, "password".toCharArray());
    SSLContext sslContext = SSLContext.getInstance("TLSv1.3");
    sslContext.init(
        keyManagerFactory.getKeyManagers(), 
        trustManagerFactory.getTrustManagers(), 
        null
    );
    HttpClient httpClient = HttpClients.custom()
            .setSSLContext(sslContext)
            .setSSLHostnameVerifier(new DefaultHostnameVerifier())
            .build();