【Spring Security】分布式鉴权的使用

在Spring Security中使用分布式鉴权，通常涉及到多个微服务之间的认证和授权。以下是一个简化的例子，展示了如何配置一个使用JWT的分布式系统。

1. 引入依赖（以Maven为例）：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
    <groupId>io.jsonwebtoken</groupId>
    <artifactId>jjwt</artifactId>
    <version>0.9.1</version>
</dependency>

2. 配置Spring Security：

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
 
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .csrf().disable() // 禁用CSRF保护
            .authorizeRequests()
            .anyRequest().authenticated()
            .and()
            .addFilter(new JwtAuthenticationFilter(authenticationManager()));
    }
}

3. 创建JWT过滤器：

public class JwtAuthenticationFilter extends UsernamePasswordAuthenticationFilter {
 
    public JwtAuthenticationFilter(AuthenticationManager authenticationManager) {
        super(authenticationManager);
    }
 
    @Override
    public Authentication attemptAuthentication(HttpServletRequest request,
                                                HttpServletResponse response) throws AuthenticationException {
        // 从HTTP头信息中获取Token
        String token = request.getHeader("Authorization");
 
        // 如果token不为空，则进行鉴权
        if (token != null) {
            // 解析JWT并获取用户信息
            String user = Jwts.parser()
                    .setSigningKey("secretkey".getBytes())
                    .parseClaimsJws(token.replace("Bearer ", ""))
                    .getBody()
                    .getSubject();
 
            if (user != null) {
                return new UsernamePasswordAuthenticationToken(user, null, null);
            }
            return null;
        }
        return null;
    }
 
    @Override
    protected void successfulAuthentication(HttpServletRequest request,
                                            HttpServletResponse response,
                                            FilterChain chain,
                                            Authentication authentication) {
        // 认证成功后的处理
        super.successfulAuthentication(request, response, chain, authentication);
    }
}

4. 在服务提供者中验证和处理JWT：

@Re