Difference between keytool and openssl?

问题

We can generate certificate through keytool like this

keytool -genkey -alias initcert  -keyalg  RSA  -keystore keycloak.jks  -validity 365  -keysize 2048

and through openssl also like this

Openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/CN=nginxsvc/O=nginxsvc"

What is the difference between these two technique and which we should use?

来源：https://stackoverflow.com/questions/48472764/difference-between-keytool-and-openssl