java 通过Spring Security OAuth2 实现多人登录互踢下线 的功能代码、

以下是一个基于 Spring Security OAuth2 实现多人登录互踢下线的示例代码：

1. 配置 Spring Security OAuth2

在 Spring Boot 项目中，可以通过在 application.properties 或 application.yml 中配置以下内容来启用 Spring Security OAuth2：

spring.security.oauth2.client.registration.my-client-id.client-id=your-client-id
spring.security.oauth2.client.registration.my-client-id.client-secret=your-client-secret
spring.security.oauth2.client.registration.my-client-id.provider=my-provider
spring.security.oauth2.client.registration.my-client-id.redirect-uri=http://localhost:8080/login/oauth2/code/my-client-id
spring.security.oauth2.client.registration.my-client-id.scope=read,write

2. 配置 Token 存储方式为 Redis

可以通过在 application.properties 或 application.yml 中配置以下内容来启用 Redis 存储 Token：

spring.redis.host=your-redis-host
spring.redis.port=your-redis-port
spring.redis.password=your-redis-password
spring.redis.database=0
spring.security.oauth2.provider.token.store-type=redis

3. 在用户登录时生成唯一 Token 标识并存储到 Redis 中

可以通过编写一个自定义的 TokenStore 来实现在用户登录时生成唯一 Token 标识并存储到 Redis 中，以下是一个示例代码：

@Component
public class RedisTokenStore implements TokenStore {
 
    @Autowired
    private RedisTemplate<String, Object> redisTemplate;
 
    private static final String ACCESS_TOKEN_PREFIX = "access:";
    private static final String AUTH_TO_ACCESS_PREFIX = "auth_to_access:";
    private static final String AUTH_TO_REFRESH_PREFIX = "auth_to_refresh:";
    private static final String CLIENT_ID_TO_ACCESS_PREFIX = "client_id_to_access:";
    private static final String REFRESH_TOKEN_PREFIX = "refresh:";
 
    @Override
    public OAuth2AccessToken getAccessToken(OAuth2Authentication authentication) {
        // Implement this method
    }
 
    @Override
    public void storeAccessToken(OAuth2AccessToken token, OAuth2Authentication authentication) {
        // Generate a unique token id
        String tokenId = UUID.randomUUID().toString();
 
        // Store the token in Redis
        redisTemplate.opsForValue().set(ACCESS_TOKEN_PREFIX + tokenId, token);
        redisTemplate.opsForValue().set(AUTH_TO_ACCESS_PREFIX + authenticationKeyGenerator.extractKey(authentication), tokenId);
        redisTemplate.opsForValue().set(CLIENT_ID_TO_ACCESS_PREFIX + token.getClientId(), tokenId);
        if (token.getRefreshToken() != null && token.getRefreshToken().getValue() != null) {
            redisTemplate.opsForValue().set(AUTH_TO_REFRESH_PREFIX + authenticationKeyGenerator.extractKey(authentication), token.getRefreshToken().getValue());
            redisTemplate.opsForValue().set(REFRESH_TOKEN_PREFIX + token.getRefreshToken().getValue(), tokenId);
        }
    }
 
    // Implement other methods
}

4. 在用户退出登录时删除 Redis 中的 Token 标识

可以通过编写一个 LogoutHandler 来实现在用户退出登录时删除 Redis 中的 Token 标识，以下是一个示例代码：

@Component
public class RedisLogoutHandler implements LogoutHandler {
 
    @Autowired
    private RedisTemplate<String, Object> redisTemplate;
 
    private static final String ACCESS_TOKEN_PREFIX = "access:";
 
    @Override
    public void logout(HttpServletRequest request, HttpServletResponse response, Authentication authentication) {
        // Get the token from the request
        String token = extractToken(request);
 
        // Delete the token from Redis
        if (StringUtils.isNotBlank(token)) {
            redisTemplate.delete(ACCESS_TOKEN_PREFIX + token);
        }
    }
 
    private String extractToken(HttpServletRequest request) {
        // Implement this method
    }
}

5. 在用户登录时检查 Redis 中是否存在相同用户的 Token 标识

可以通过编写一个自定义的 ConcurrentSessionControlStrategy 来实现在用户登录时检查 Redis 中是否存在相同用户的 Token 标识，以下是一个示例代码：

@Component
public class RedisConcurrentSessionControlStrategy extends ConcurrentSessionControlStrategy {
 
    @Autowired
    private RedisTemplate<String, Object> redisTemplate;
 
    private static final String ACCESS_TOKEN_PREFIX = "access:";
 
    @Override
    public void onAuthentication(Authentication authentication, HttpServletRequest request, HttpServletResponse response) throws SessionAuthenticationException {
        // Get the user id from the authentication
        String userId = getUserId(authentication);
 
        // Get the token from the request
        String token = extractToken(request);
 
        // Check if there is another active session for this user
        if (StringUtils.isNotBlank(userId)) {
            String existingToken = (String) redisTemplate.opsForValue().get(userId);
            if (StringUtils.isNotBlank(existingToken) && !existingToken.equals(token)) {
                // Delete the existing token from Redis
                redisTemplate.delete(ACCESS_TOKEN_PREFIX + existingToken);
 
                // Throw an exception to indicate that the user has been logged out
                throw new ConcurrentSessionControlStrategy.SessionAuthenticationException("User " + userId + " has been logged out by another session.");
            }
 
            // Store the token in Redis
            if (StringUtils.isNotBlank(token)) {
                redisTemplate.opsForValue().set(userId, token);
            }
        }
 
        // Call the superclass method to continue the authentication process
        super.onAuthentication(authentication, request, response);
    }
 
    private String getUserId(Authentication authentication) {
        // Implement this method
    }
 
    private String extractToken(HttpServletRequest request) {
        // Implement this method
    }
}

通过以上代码，可以实现基于 Spring Security OAuth2 的多人登录互踢下线功能。需要注意的是，以上代码仅作为示例，实际应用中可能需要根据具体的业务需求进行修改和优化。