springsecurity整合jwt具体怎么做

Spring Security 和 JWT(JSON Web Token)可以一起使用以实现安全认证和授权。下面是整合的一些步骤：

1. 添加依赖

在 pom.xml 文件中添加 Spring Security 和 JWT 的依赖。

<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-web</artifactId>
    <version>5.2.2.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-config</artifactId>
    <version>5.2.2.RELEASE</version>
</dependency>
<dependency>
    <groupId>io.jsonwebtoken</groupId>
    <artifactId>jjwt</artifactId>
    <version>0.9.1</version>
</dependency>

2. 配置 Spring Security

在 Spring Security 配置文件中添加对 JWT 的支持。

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
 
    @Autowired
    private JwtAuthenticationEntryPoint unauthorizedHandler;
 
    @Autowired
    private JwtTokenProvider jwtTokenProvider;
 
    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
 
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.cors().and().csrf().disable().
                authorizeRequests()
                .antMatchers("/api/auth/**").permitAll()
                .anyRequest().authenticated()
                .and()
                .exceptionHandling().authenticationEntryPoint(unauthorizedHandler).and()
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
 
        http.apply(new JwtTokenFilterConfigurer(jwtTokenProvider));
    }
 
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder(12);
    }
 
    @Bean
    public JwtTokenFilter jwtTokenFilter() {
        return new JwtTokenFilter();
    }
}

3. 创建 JWT 工具类

创建一个 JWT 工具类，用于生成和解析 JWT。

@Service
public class JwtTokenProvider {
 
    @Value("${app.jwtSecret}")
    private String jwtSecret;
 
    @Value("${app.jwtExpirationInMs}")
    private int jwtExpirationInMs;
 
    public String generateToken(Authentication authentication) {
        UserPrincipal userPrincipal = (UserPrincipal) authentication.getPrincipal();
 
        Date now = new Date();
        Date expiryDate = new Date(now.getTime() + jwtExpirationInMs);
 
        return Jwts.builder()
                .setSubject(Long.toString(userPrincipal.getId()))
                .setIssuedAt(new Date())
                .setExpiration(expiryDate)
                .signWith(SignatureAlgorithm.HS512, jwtSecret)
                .compact();
    }
 
    public Long getUserIdFromToken(String token) {
        Claims claims = Jwts.parser()
                .setSigningKey(jwtSecret)
                .parseClaimsJws(token)
                .getBody();
 
        return Long.parseLong(claims.getSubject());
    }
 
    public boolean validateToken(String authToken) {
        try {
            Jwts.parser().setSigningKey(jwtSecret).parseClaimsJws(authToken);
            return true;
        } catch (SignatureException ex) {
            System.out.println("Invalid JWT signature");
        } catch (MalformedJwtException ex) {
            System.out.println("Invalid JWT token");
        } catch (ExpiredJwtException ex) {
            System.out.println("Expired JWT token");
        } catch (UnsupportedJwtException ex) {
            System.out.println("Unsupported JWT token");
        } catch (IllegalArgumentException ex) {
            System.out.println("JWT claims string is empty.");
        }
        return false;
    }
}

4. 创建 JWT 过滤器

创建一个 JWT 过滤器，用于从 HTTP 请求中提取 JWT，并将它交给 Spring Security 进行认证和授权。

public class JwtTokenFilter extends OncePerRequestFilter {
 
    @Autowired
    private JwtTokenProvider jwtTokenProvider;
 
    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
                                    FilterChain filterChain) throws ServletException, IOException {
        String jwt = getJwtFromRequest(httpServletRequest);
 
        if (StringUtils.hasText(jwt) && jwtTokenProvider.validateToken(jwt)) {
            Long userId = jwtTokenProvider.getUserIdFromToken(jwt);
 
            UserDetails userDetails = userDetailsService.loadUserById(userId);
            UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
            authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(httpServletRequest));
 
            SecurityContextHolder.getContext().setAuthentication(authentication);
        }
        filterChain.doFilter(httpServletRequest, httpServletResponse);
    }
 
    private String getJwtFromRequest(HttpServletRequest request) {
        String bearerToken = request.getHeader("Authorization");
        if (StringUtils.hasText(bearerToken) && bearerToken.startsWith("Bearer ")) {
            return bearerToken.substring(7);
        }
        return null;
    }
}

5. 创建 JWT 认证入口

创建一个 JWT 认证入口，用于处理认证失败的情况。

@Component
public class JwtAuthenticationEntryPoint implements AuthenticationEntryPoint {
 
    @Override
    public void commence(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, AuthenticationException e) throws IOException, ServletException {
        httpServletResponse.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Unauthorized");
    }
}

6. 创建自定义用户详情服务

创建一个自定义用户详情服务，用于从数据库中获取用户信息。

@Service
public class CustomUserDetailsService implements UserDetailsService {
 
    @Autowired
    private UserRepository userRepository;
 
    @Override
    @Transactional
    public UserDetails loadUserByUsername(String usernameOrEmail) throws UsernameNotFoundException {
        User user = userRepository.findByUsernameOrEmail(usernameOrEmail, usernameOrEmail)
                .orElseThrow(() ->
                        new UsernameNotFoundException("User not found with username or email : " + usernameOrEmail)
                );
 
        return UserPrincipal.create(user);
    }
 
    @Transactional
    public UserDetails loadUserById(Long id) {
        User user = userRepository.findById(id).orElseThrow(
                () -> new ResourceNotFoundException("User", "id", id)
        );
 
        return UserPrincipal.create(user);
    }
}

这些步骤只是整合 Spring Security 和 JWT 的基本步骤，具体还需根据项目需求进行调整和完善。