SpringSecurity+登录功能+jwt校验过滤器+redis配置

一、思路分析

1.登录

①自定义登录接口  

			调用ProviderManager的方法进行认证 如果认证通过生成jwt

			把用户信息存入redis中

②自定义UserDetailsService 

			在这个实现类中去查询数据库

注意配置passwordEncoder为BCryptPasswordEncoder

2.校验：

①定义Jwt认证过滤器

			获取token

			解析token获取其中的userid

			从redis中获取用户信息

			存入SecurityContextHolder

二、登录接口代码实现（第一次登陆获取jwt）

1.业务代码

	@Autowired
    private AuthenticationManager authenticationManager;

    @Autowired
    private RedisCache redisCache;

	@Override
    public ResponseResult login(User user) {
        //1,使用springsecurity功能认证,把用户名密码存入令牌
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(user.getUserName(),user.getPassword());
        //2.1,默认使用UserDetailService去内存中找user用户，需要定义Impl实现类来重写查询方法，改成从数据库查询
        //2.2,UserDetailServiceImpl从数据库查询出user返回到authenticate这里。具体查看a类
        Authentication authenticate = authenticationManager.authenticate(authenticationToken);
        //2.3，判断是否认证通过
        if(Objects.isNull(authenticate)){
            throw new RuntimeException("用户名或密码错误");
        }
        //3.1,获取userid 生成token
        LoginUser loginUser = (LoginUser) authenticate.getPrincipal();
        String userId = loginUser.getUser().getId().toString();
        //3.2,生成jwt 
        String jwt = JwtUtil.createJWT(userId);
        //3.3,把用户信息存入redis
        redisCache.setCacheObject("bloglogin:"+userId,loginUser);

        //4.1,把token和userinfo封装 返回
        //4.2,把User转换成UserInfoVo
        UserInfoVo userInfoVo = BeanCopyUtils.copyBean(loginUser.getUser(), UserInfoVo.class);
        BlogUserLoginVo vo = new BlogUserLoginVo(jwt,userInfoVo);
        return ResponseResult.okResult(vo);
    }

2.a类:UserDetailsServiceImpl

@Service
public class UserDetailsServiceImpl implements UserDetailsService {

    @Autowired
    private UserMapper userMapper;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        //根据用户名查询用户信息
        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(User::getUserName,username);
        User user = userMapper.selectOne(queryWrapper);
        //判断是否查到用户  如果没查到抛出异常
        if(Objects.isNull(user)){
            throw new RuntimeException("用户不存在");
        }
        //返回用户信息
        // TODO 查询权限信息封装
        return new LoginUser(user);
    }
}

3.SecurityConfig配置类

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Bean
    public PasswordEncoder passwordEncoder(){
        return new BCryptPasswordEncoder();
    }
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                //关闭csrf
                .csrf().disable()
                //不通过Session获取SecurityContext
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                // 对于登录接口 允许匿名访问
                .antMatchers("/login").anonymous()
                // 除上面外的所有请求全部不需要认证即可访问
                .anyRequest().permitAll();


        http.logout().disable();
        //允许跨域
        http.cors();
    }
    @Override
    @Bean
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
}

三、登录校验过滤器代码实现（校验jwt）

1.登录校验过滤器

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    @Autowired
    private RedisCache redisCache;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterCh