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import java.io.File;
import java.io.FileInputStream;
import java.security.KeyStore;
import java.security.cert.PKIXParameters;
import java.security.cert.TrustAnchor;
import java.security.cert.X509Certificate;
import java.util.Iterator;
public class Main {
public static void main(String[] argv) throws Exception {
String filename = System.getProperty("java.home")
+ "/lib/security/cacerts".replace('/', File.separatorChar);
FileInputStream is = new FileInputStream(filename);
KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
String password = "password";
keystore.load(is, password.toCharArray());
PKIXParameters params = new PKIXParameters(keystore);
Iterator it = params.getTrustAnchors().iterator();
for (; it.hasNext();) {
TrustAnchor ta = (TrustAnchor) it.next();
X509Certificate cert = ta.getTrustedCert();
System.out.println(cert.getSigAlgName());
}
}
}
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