Spring Boot — JWT Token based resource authentication & JavaMailSender

SAURABH SHARMA
2 min readNov 26, 2020

The idea behind that sending JWT token to the developer email while working in the development phase.

TechShareZone — Spring-boot-jwt and email

Problem
In the current trend of running with the crowd, I have experienced that when any secure microservices module is in the development phase the developer’s pain is hitting a controller that gets generate the JWT token, Why don’t set the MAX_EXPIRE 24hrs or 8hrs and send it to the developer’s email address.

Implementation
Here is explanation of the implementation. See the gradle.build for required dependencies from below link.

https://github.com/saurabhshcs/bootifyjpajwt/blob/main/build.gradle

JWTService

We need to create an utility class or service that will be responsible to following functionalities-
1- generateToken
2- validateToken
3- extractClaim
4- extractExpiration
5- extractUserName
6- extractAllClaims

Please refer following link for looking of the implementation of these methods.

Request Filter — that validate every request

Filter that is used for inspecting every request of the user and extract the userName from the JWT token and validate that JWT token

{
“jwt”: “eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJmb28iLCJleHAiOjE2MDYzOTU0ODMsImlhdCI6MTYwNjM1OTQ4M30.bmWzebUtCos1a-eTQK7c28XIMos46_qjqvL5YwUSLCk”
}
https://github.com/saurabhshcs/bootifyjpajwt/blob/main/src/main/java/com/techsharezone/bootifyjpajwt/filter/JwtRequestFilter.java

AuthenticateController

This controller is used to generateToken and send that token to the developer’s email address. (as of now hard coded but we can pick it from IDE configurations)

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SAURABH SHARMA

Technology Enthusiast and Open Source Technology advocate