openssl 如何查看 der 和 pem格式的证书

One way to verify if "keytool" did export my certificate using DER and PEM formats correctly or not is to use "OpenSSL" to view those certificate files. To do this, I used the "openssl x509" command to view keytool_crt.der and keytool_crt.pem:

>openssl x509 -in keytool_crt.pem -inform pem -noout -text

Certificate:
Data:
Version: 3 (0x2)
Serial Number: 1185636568 (0x46ab60d8)
Signature Algorithm: dsaWithSHA1
Issuer: C=CA, ST=Herong State, L=Herong City, ...
...

>openssl x509 -in keytool_crt.der -inform der -noout -text

Certificate:
Data:
Version: 3 (0x2)
Serial Number: 1185636568 (0x46ab60d8)
Signature Algorithm: dsaWithSHA1
Issuer: C=CA, ST=Herong State, L=Herong City, ...
O=Herong Company, OU=Heron
...