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7. Test single sign-on:
At this point, we have completed the development of the single sign-on system. We can run the application and log in by accessing the login page (http:\/\/localhost:8080\/login) through the browser. After successful login, we can access other protected resources by adding Access Token in the request header. <\/p>\n

Conclusion:
This article introduces how to use Java to develop a single sign-on system based on Spring Security OAuth2, and provides specific code examples. By using a single sign-on system, users can easily access multiple websites and applications without having to authenticate repeatedly. I hope this article can help readers better understand and apply the relevant knowledge of Spring Security OAuth2. <\/p>"}

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How to use Java to develop a single sign-on system based on Spring Security OAuth2

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Sep 20, 2023 pm 01:06 PM

java oauth spring security

如何使用Java開發(fā)一個基于Spring Security OAuth2的單點登錄系統(tǒng)

How to use Java to develop a single sign-on system based on Spring Security OAuth2

Introduction:
With the rapid development of the Internet, more and more websites and applications require users to log in, but users do not want to remember an account and password for each website or application. The Single Sign-On (SSO) system can solve this problem, allowing users to access multiple websites and applications without repeated authentication after logging in once. This article will introduce how to use Java to develop a single sign-on system based on Spring Security OAuth2 and provide specific code examples.

1. Preparation work:
Before starting development, we need to prepare some basic tools and environments:

JDK 1.8 and above;
Maven 3.0 and above;
Development IDE, such as Eclipse, IntelliJ IDEA, etc.;
An available MySQL database.

2. Create a Spring Boot project:
First, we need to create a Spring Boot project and add the required dependencies. Open Eclipse or IntelliJ IDEA, click "New", select "Spring Starter Project", and fill in the necessary information (such as project name, package name, etc.). Then, add the following dependencies to the project's pom.xml file:

<dependencies>
   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-web</artifactId>
   </dependency>
   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-security</artifactId>
   </dependency>
   <dependency>
       <groupId>org.springframework.security.oauth</groupId>
       <artifactId>spring-security-oauth2</artifactId>
       <version>2.3.4.RELEASE</version>
   </dependency>
   <!-- 添加其他需要的依賴 -->
</dependencies>

3. Configure Spring Security OAuth2:
Next, we need to configure the Spring Security OAuth2 module. Create a file named application.yml in the src/main/resources directory and add the following configuration information:

spring:
   security:
       oauth2:
           client:
               registration:
                   custom:
                       client-id: {your-client-id}
                       client-secret: {your-client-secret}
                       provider: custom
                       auth-uri: {authorization-uri}
                       token-uri: {token-uri}
                       user-info-uri: {user-info-uri}
                       redirect-uri: {redirect-uri}
                       scope: {scope-list}
               provider:
                   custom:
                       authorization-uri: {authorization-uri}
                       token-uri: {token-uri}
                       user-info-uri: {user-info-uri}
           resource:
               user-info-uri: {user-info-uri}

In the above configuration, {your-client-id}, {your-client-secret} , {authorization-uri}, {token-uri}, {user-info-uri}, {redirect-uri} and {scope-list} need to be replaced with actual values ??respectively.

4. Create a login page:
Next, we need to create a login page for user login. Create a file named login.html in the src/main/resources/templates directory and add the following code:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Login</title>
</head>
<body>
    <h2>Login</h2>
    <form method="post" action="/login">
        <div>
            <label for="username">Username:</label>
            <input type="text" id="username" name="username" />
        </div>
        <div>
            <label for="password">Password:</label>
            <input type="password" id="password" name="password" />
        </div>
        <button type="submit">Login</button>
    </form>
</body>
</html>

5. Create an authentication and authorization server:
Next, we need to create an An authentication server (Authorization Server) and an authorization server (Resource Server) handle user authentication and authorization. Create a Java class named SecurityConfig and add the following code:

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
   
   @Override
   protected void configure(HttpSecurity http) throws Exception {
      http.authorizeRequests().antMatchers("/login").permitAll().anyRequest().authenticated()
           .and().formLogin().loginPage("/login").permitAll()
           .and().logout().logoutSuccessUrl("/login?logout").permitAll();

      http.csrf().disable();
   }
   
   @Override
   protected void configure(AuthenticationManagerBuilder auth) throws Exception {
      auth.inMemoryAuthentication()
           .withUser("admin").password("{noop}admin").roles("ADMIN");
   }
}

6. Create a resource server:
Next, we need to create a resource server to protect our API. Create a Java class named ResourceServerConfig and add the following code:

@Configuration
@EnableResourceServer
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class ResourceServerConfig extends ResourceServerConfigurerAdapter {
   
   @Override
   public void configure(HttpSecurity http) throws Exception {
      http.authorizeRequests().antMatchers("/api/**").authenticated();
   }

}

7. Test single sign-on:
At this point, we have completed the development of the single sign-on system. We can run the application and log in by accessing the login page (http://localhost:8080/login) through the browser. After successful login, we can access other protected resources by adding Access Token in the request header.

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