针对不同的http客户端，有不同的配置方式，但总的来说，就是配置SSLSocketFactory和HostnameVerifier。
一、okhttp
可以参考：https://blog.csdn.net/u014752325/article/details/73185351
二、httpclient

这里又分为连接池和非连接池，配置稍有不同。

连接池：

public final CloseableHttpClient getCustomClient() {
    try {
        HttpClientBuilder builder = HttpClientBuilder.create().useSystemProperties();
        SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null,
                (TrustStrategy) (X509Certificate[] arg0, String arg1) -> true).build();
        builder.setSSLContext(sslContext);
        HostnameVerifier hostnameVerifier = new NoopHostnameVerifier();
        SSLConnectionSocketFactory sslSocketFactory = new SSLConnectionSocketFactory(sslContext, hostnameVerifier);
        Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory>create()
                .register("http", PlainConnectionSocketFactory.getSocketFactory())
                .register("https", sslSocketFactory)
                .build();
        PoolingHttpClientConnectionManager connMgr = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
        builder.setConnectionManager(connMgr);
        return builder.build();
    } catch (Exception ex) {
        LOG.log(Level.SEVERE, ex.getMessage(), ex);
    }
    return getSystemClient();
}

非连接池：

CloseableHttpClient configureHttpClient(boolean enableSslVerify) {

    HttpClientBuilder builder = HttpClientBuilder.create();

    if (enableSslVerify) {
      return builder.build();
    }

    SSLContext sslContext = null;
    try {
      sslContext =
          new SSLContextBuilder().loadTrustMaterial(null, (x509Certificates, s) -> true).build();
    } catch (NoSuchAlgorithmException | KeyStoreException | KeyManagementException e) {
      LOG.error("Could not create ssl context", e);
    }

    builder.setSSLHostnameVerifier(new NoopHostnameVerifier()).setSSLContext(sslContext);

    return builder.build();
  }

可以参考以下文档，几乎包括了所有可能的配置：https://www.programcreek.com/java-api-examples/?api=org.apache.http.conn.ssl.NoopHostnameVerifier
三、feignclient

@Bean
    public Client feignClient() {
        SSLContext context = buildCertificateIgnoringSslContext();
        Client trustSSLSockets = new Client.Default(context.getSocketFactory(), new NoopHostnameVerifier());
        return trustSSLSockets;
    }
public static SSLContext buildCertificateIgnoringSslContext() {
        try {
            return new SSLContextBuilder()
                .loadTrustMaterial(null, (x509Certificates, s) -> true)
                .build();
        }
        catch (KeyManagementException | NoSuchAlgorithmException | KeyStoreException e) {
            throw new IllegalStateException("Unexpected exception while building the certificate-ignoring SSLContext.", e);
        }
    }