接上篇，用java代码实现一下获取远程服务端证书，还是拿新浪首页测试，上代码：
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package org.test;
import java.net.URL;
import java.security.MessageDigest;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import javax.net.ssl.HttpsURLConnection;
public class Application {
public static void main(String[] args) throws Exception {
URL url = new URL("https://www.sina.com.cn");
HttpsURLConnection conn = (HttpsURLConnection)url.openConnection();
conn.connect();
Certificate[] certs = conn.getServerCertificates(); //会拿到完整的证书链
X509Certificate cert = (X509Certificate)certs[0]; //cert[0]是证书链的最下层
System.out.println("序号：" + cert.getSerialNumber());
System.out.println("颁发给：" + cert.getSubjectDN().getName());
System.out.println("颁发者：" + cert.getIssuerDN().getName());
System.out.println("起始：" + cert.getNotBefore());
System.out.println("过期：" + cert.getNotAfter());
System.out.println("算法：" + cert.getSigAlgName());
System.out.println("指纹：" + getThumbPrint(cert));
conn.disconnect();
}
private static String getThumbPrint(X509Certificate cert) throws Exception {
MessageDigest md = MessageDigest.getInstance("SHA-1");
byte[] der = cert.getEncoded();
md.update(der);
byte[] digest = md.digest();
return bytesToHexString(digest);
}
private static String bytesToHexString(byte[] src) {
StringBuilder stringBuilder = new StringBuilder("");
if (src == null || src.length <= 0) {
return null;
}
for (int i = 0; i < src.length; i++) {
int v = src[i] & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
return stringBuilder.toString();
}
} |
运行看效果，得到的输出：
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序号：78653003708979598891221754220386804014 颁发给：CN=sina.com, OU="Sina.com Technology(China)Co.,ltd", O="Sina.com Technology(China)Co.,ltd", L=Beijing, ST=Beijing, C=CN 颁发者：CN=GeoTrust SSL CA - G3, O=GeoTrust Inc., C=US 起始：Tue Feb 21 08:00:00 CST 2017 过期：Tue Nov 26 07:59:59 CST 2019 算法：SHA256withRSA 指纹：6ce7b869e4d6f77a31a967af2dc1b904fd059aa3 |
与之前是一样的。
本文转自 BoyTNT 51CTO博客，原文链接：http://blog.51cto.com/boytnt/2052616，如需转载请自行联系原作者