Implementing Single Sign-On (SSO) with OAuth2, JWT, and Spring Security in Spring Boot
This article provides a step‑by‑step guide on building a Single Sign‑On solution using OAuth2, JWT tokens, and Spring Security within a Spring Boot application, covering the underlying concepts, Maven dependencies, configuration files, server setup, client integration, and logout handling.
The author, a senior architect, shares a practical tutorial on implementing Single Sign‑On (SSO) by leveraging OAuth2, JWT, and Spring Security in a Spring Boot environment, starting with an overview of SSO concepts and the typical flow of token‑based authentication.
Key points include:
SSO works by issuing a token after user authentication, allowing subsequent services to access protected resources without re‑login.
OAuth2 provides the authorization framework, while JWT is used to carry the access token.
Spring Security handles permission checks and integrates with the token mechanism.
1. Maven Dependencies
<project xmlns="http://maven.apache.org/POM/4.0.0" ...>
...
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security.oauth.boot</groupId>
<artifactId>spring-security-oauth2-autoconfigure</artifactId>
<version>2.1.3.RELEASE</version>
</dependency>
...
</project>2. Application Configuration (application.yml)
spring:
datasource:
url: jdbc:mysql://localhost:3306/permission
username: root
password: 123456
driver-class-name: com.mysql.jdbc.Driver
jpa:
show-sql: true
session:
store-type: redis
redis:
host: 127.0.0.1
password: 123456
port: 6379
server:
port: 80803. Authorization Server Configuration
package com.cjs.sso.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.oauth2.config.annotation.web.configuration.EnableAuthorizationServer;
import org.springframework.security.oauth2.config.annotation.web.configuration.AuthorizationServerConfigurerAdapter;
@Configuration
@EnableAuthorizationServer
public class AuthorizationServerConfig extends AuthorizationServerConfigurerAdapter {
// configure token store, client details, and JWT converter
}4. Web Security Configuration
package com.cjs.sso.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
// form login, session management, CSRF disable
}5. Custom Login Page
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>...</head>
<body class="bg-dark">
<form th:action="@{/login}" method="post">
<input type="text" name="username" placeholder="Username"/>
<input type="password" name="password" placeholder="Password"/>
<button type="submit">登录</button>
</form>
</body>
</html>6. Client Application Setup
Two client projects (member and order) are defined with their own application.yml specifying client‑id, client‑secret, token endpoint URLs, and JWT key URI. Each client includes a WebSecurityConfig that enables @EnableOAuth2Sso and configures request authorization.
7. Logout Strategy
Logout clears the session on each business service; because JWT tokens are stateless, token revocation requires additional handling on the authorization server.
8. Project Structure and Demo
The repository layout is illustrated with diagrams, and a running demo shows the authentication flow and protected resources.
Overall, the guide walks readers through the complete SSO implementation, from conceptual understanding to concrete code and configuration, making it a valuable reference for backend developers building secure authentication systems.
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Top Architect
Top Architect focuses on sharing practical architecture knowledge, covering enterprise, system, website, large‑scale distributed, and high‑availability architectures, plus architecture adjustments using internet technologies. We welcome idea‑driven, sharing‑oriented architects to exchange and learn together.
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