Spring Cloud Security：Oauth2实现单点登录

在Spring Cloud Security中实现OAuth2单点登录的核心步骤如下：

1. 使用Spring Security和Spring Security OAuth2依赖。
2. 配置一个AuthorizationServer，定义如何认证用户并发放令牌。
3. 配置一个ResourceServer，验证令牌并提供受保护资源的访问。
4. 创建一个WebSecurityConfigurerAdapter配置类来定义其他的安全设置，例如CSRF保护等。
5. 实现用户的登录和注销逻辑。

以下是一个简化的例子：

pom.xml依赖（部分）:

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-oauth2</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-security</artifactId>
</dependency>

AuthorizationServerConfig.java:

@Configuration
@EnableAuthorizationServer
public class AuthorizationServerConfig extends AuthorizationServerConfigurerAdapter {
 
    @Autowired
    private AuthenticationManager authenticationManager;
 
    @Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        clients.inMemory()
            .withClient("my-client")
            .secret("my-secret")
            .authorizedGrantTypes("password", "refresh_token")
            .scopes("read", "write")
            .accessTokenValiditySeconds(600); // 10 minutes
    }
 
    @Override
    public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
        endpoints.authenticationManager(authenticationManager);
    }
}

ResourceServerConfig.java:

@Configuration
@EnableResourceServer
public class ResourceServerConfig extends ResourceServerConfigurerAdapter {
 
    @Override
    public void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
            .anyRequest().authenticated();
    }
}

SecurityConfig.java:

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {
 
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable(); // Temporarily disable CSRF for simple demo
    }
}

SecurityConfig.java:

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {
 
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable(); // Tem