Java – 信任所有SSL證書 (解決 PKIX path building failed 問題)

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.TrustManager;
import javax.net.ssl.X509TrustManager;
  
public class SslUtils {private static void trustAllHttpsCertificates() throws Exception {
    TrustManager[] trustAllCerts = new TrustManager[1];
    TrustManager tm = new miTM();
    trustAllCerts[0] = tm;
    SSLContext sc = SSLContext.getInstance("SSL");
    sc.init(null, trustAllCerts, null);
    HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
}
  
static class miTM implements TrustManager,X509TrustManager {
    public X509Certificate[] getAcceptedIssuers() {
        return null;
    }
  
    public boolean isServerTrusted(X509Certificate[] certs) {
        return true;
    }
  
    public boolean isClientTrusted(X509Certificate[] certs) {
        return true;
    }
  
    public void checkServerTrusted(X509Certificate[] certs, String authType)
            throws CertificateException {
        return;
    }
  
    public void checkClientTrusted(X509Certificate[] certs, String authType)
            throws CertificateException {
        return;
    }
}
  
/**
 * 忽略HTTPS請求的SSL證書，必須在openConnection之前調用
 * @throws Exception
 */
public static void ignoreSsl() throws Exception{
    HostnameVerifier hv = new HostnameVerifier() {
        public boolean verify(String urlHostName, SSLSession session) {
            System.out.println("Warning: URL Host: " + urlHostName + " vs. " + session.getPeerHost());
            return true;
        }
    };
    trustAllHttpsCertificates();
    HttpsURLConnection.setDefaultHostnameVerifier(hv);
}
  
}