Java X.509和IBM X.509都是數(shù)字證書標準，用于證明網(wǎng)絡安全通信的身份驗證和數(shù)據(jù)完整性。

Java X.509是基于Java編程語言的標準實現(xiàn)，支持在Java平臺上開發(fā)應用程序，提供數(shù)字證書驗證和管理功能。

import java.security.cert.*;
import java.io.*;
public class X509Example {
public static void main(String[] args) {
try {
//打開證書文件
FileInputStream certificateFile = new FileInputStream("certificate.crt");
//解析證書
CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
X509Certificate certificate = (X509Certificate) certificateFactory.generateCertificate(certificateFile);
//證書信息
System.out.println("Subject Name:\t" + certificate.getSubjectDN().getName());
System.out.println("Issuer Name:\t" + certificate.getIssuerDN().getName());
System.out.println("Valid From:\t" + certificate.getNotBefore());
System.out.println("Valid To:\t" + certificate.getNotAfter());
} catch (Exception e) {
e.printStackTrace();
}
}
}

IBM X.509是由IBM公司開發(fā)的數(shù)字證書標準，主要用于IBM的服務器和軟件產(chǎn)品，提供數(shù)據(jù)安全保護和身份驗證功能。

import com.ibm.security.x509.*;
public class X509Example {
public static void main(String[] args) {
try {
//打開證書文件
String certificateFile = "certificate.crt";
X509CertImpl certificate = new X509CertImpl(certificateFile);
//證書信息
System.out.println("Subject Name:\t" + certificate.getSubjectDN().toString());
System.out.println("Issuer Name:\t" + certificate.getIssuerDN().toString());
System.out.println("Valid From:\t" + certificate.getNotBefore());
System.out.println("Valid To:\t" + certificate.getNotAfter());
} catch (Exception e) {
e.printStackTrace();
}
}
}

無論是Java X.509還是IBM X.509，都提供了簡單易用的API和工具，以便開發(fā)人員在應用程序中對數(shù)字證書進行驗證和管理。