ThreadLocal stores the current login user information

ThreadLocal User information can be saved in the thread , When the request is over, we are clearing the saved information . In this way, when we develop, we can directly from the overall situation ThreadLocal It is very convenient to obtain user information in

/** *  Save the name of the user object ThreadLocal * * @author wangql */
@Component
public class UserInfoThreadHolder {
    

    private static final ThreadLocal<SysUser> userThreadLocal = new ThreadLocal<>();

    /** *  Add the currently logged in user method  */
    public static void addCurrentUser() {
    

        // The login object is obtained from here and set Into the ThreadLocal
        // According to the business logic 
        SysUser sysUser = new SysUser();


        userThreadLocal.set(sysUser);
    }

    public static SysUser getCurrentUser() {
    
        return userThreadLocal.get();
    }

    /** *  Prevent memory leaks  */
    public static void remove() {
    
        userThreadLocal.remove();
    }

}

Interceptors can be used to operate

/** *  Save the login user into ThreadLocal * @author wangql */
@Component
public class LoginInterceptor implements HandlerInterceptor {
    

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    
        UserInfoThreadHolder.addCurrentUser();
        return true;
    }

    /** *  Avoid memory leaks  */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    
        UserInfoThreadHolder.remove();
    }
}

Register interceptors

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
    

    @Autowired
    private LoginInterceptor loginInterceptor;


    // Register interceptors 
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
    

        registry.addInterceptor(loginInterceptor).addPathPatterns("/**");
    }

    private CorsConfiguration buildConfig() {
    
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addAllowedMethod("*");
        corsConfiguration.addExposedHeader("Authorization");
        return corsConfiguration;
    }

    /** *  Configure cross domain  * @return */
    @Bean
    public CorsFilter corsFilter() {
    
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig());
        return new CorsFilter(source);
    }

    @Override
    public void addCorsMappings(CorsRegistry registry) {
    
        registry.addMapping("/**")
                .allowedOriginPatterns("*")
                .allowCredentials(true)
                .allowedMethods("GET", "POST", "DELETE", "PUT")
                .maxAge(3600);
    }

}