java.security.UnrecoverableKeyException: Cannot recover key 处理
This exception may result from the fact that you had provided a key password that was different from the keystore password
此错误由调用getKey（alias,aliaspassword）函数抛出。
可能原因为aliaspassword的密码不正确，
注意aliaspassword必须是aias数字证书的密码。而不是keystore的密码。