// aps_development.cer 转化成pem
openssl x509 -in aps_development.cer -inform der -out PushChatCert.pem

// p12 转化成pem
openssl pkcs12 -nocerts -out PushChatKey.pem -in Push.p12

// Java服务器所需的证书为p12格式
openssl pkcs12 -export -in PushChatCert.pem -inkey PushChatKey.pem -out Weather.p12 -name "apns-cert"

// PHP服务器所需证书为pem格式
cat PushChatCert.pem PushChatKey.pem > pushCert.pem