resttemplate 无视ssl证书

要使RestTemplate忽略SSL证书，你可以创建一个自定义的SimpleClientHttpRequestFactory，并覆盖其createRequest方法。在这个方法中，你可以使用自定义的SSLContext和HostnameVerifier来创建HttpsURLConnection，并绕过证书验证。以下是一个示例代码：

import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;

public class SSL extends SimpleClientHttpRequestFactory {
    
    @Override
    protected void prepareConnection(HttpURLConnection connection, String httpMethod) throws IOException {
        if (connection instanceof HttpsURLConnection) {
            // Create a custom SSLContext that trusts all certificates
            SSLContext sslContext;
            try {
                sslContext = SSLContext.getInstance("TLS");
                sslContext.init(null, new TrustManager[] { new X509TrustManager() {
                    @Override
                    public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {}

                    @Override
                    public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {}

                    @Override
                    public X509Certificate[] getAcceptedIssuers() { return null; }
                }}, null);
            } catch (Exception e) {
                throw new IOException("Failed to create SSLContext", e);
            }

            SSLSocketFactory socketFactory = sslContext.getSocketFactory();
            ((HttpsURLConnection) connection).setSSLSocketFactory(socketFactory);

            // Bypass hostname verification
            ((HttpsURLConnection) connection).setHostnameVerifier(new HostnameVerifier() {
                @Override
                public boolean verify(String hostname, SSLSession session) {
                    return true;
                }
            });
        }

        super.prepareConnection(connection, httpMethod);
    }
}

// 使用自定义的SSL类创建RestTemplate
RestTemplate restTemplate = new RestTemplate(new SSL());

// 现在，你可以使用这个RestTemplate进行无视SSL证书的请求了

通过使用这个自定义的SSL类创建RestTemplate，你可以使其忽略SSL证书验证，并且可以安全地发送请求。请注意，这样做会增加潜在的安全风险，因为它不验证服务器的身份。所以在生产环境中使用时需谨慎。