大家好，又见面了，我是你们的朋友全栈君。
我有file.pfx文件,还有一个私钥.如何在
Java中读取file.pfx中的证书？
我用过这段代码：
import java.security.*;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.security.cert.CertificateException;
import javax.crypto.SecretKey;
import javax.security.auth.callback.*;
//These packages I have used.
public String readFile(String fn) {
String thisLine, ret = “”;
KeyStore ks = KeyStore.getInstance(“pkcs12”, “SunJSSE”);
ks.load(new FileInputStream(fn),”password”.toCharArray());
try {
Key key = ks.getKey(“1”, “password”.toCharArray());
Certificate[] cc = ks.getCertificateChain(“1”);
X509Certificate certificate1 = (X509Certificate) cc[0];//Here it throws java.lang.NullPointerException
ret += certificate1.getNotAfter();
ret += certificate1.getNotBefore();
} catch(Exception e) {
ret = “Cannot load, exception!”;
}
return ret;
}
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