java中添加证书

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echo | openssl s_client -connect smtp.exmail.qq.com:465 2>/dev/null | openssl x509 > exmail.cert
./keytool -importcert -noprompt -trustcacerts -alias exmail -file ~/exmail.cert  -keystore ~/mykeystore
./keytool -importkeystore -srckeystore ~/mykeystore -destkeystore /usr/java/latest/jre/lib/security/cacerts
systemctl restart java_service