如何在spring应用程序中验证证书是否附加在rest模板中。我已经在下面的代码中添加了证书。但是当我运行应用程序时，不管我的证书是否附加

@Bean
    public RestTemplate restTemplate(RestTemplateBuilder builder) throws Exception {
        char[] password = "password".toCharArray();

        SSLContext sslContext = SSLContextBuilder
                .create()
                .loadTrustMaterial(ResourceUtils.getFile("C:\\test\\testCer.pem"), password,
                        new TrustSelfSignedStrategy())
                .build();

        HttpClient client = HttpClients.custom().setSSLContext(sslContext).build();
        return builder.requestFactory(new HttpComponentsClientHttpRequestFactory(client))
                .build();
    }