SpringBoot 之 实现登录功能及登录拦截器

增加登录退出控制器：

# src/main/java/com/wu/controller/LoginController.java

@Controller
public class LoginController {
    @RequestMapping("/user/login")
    public String login(
        @RequestParam("username") String username,
        @RequestParam("password") String password,
        Model model,
        HttpSession session) {
        if (!StringUtils.isEmpty(username) && "123456".equals(password)) {
            session.setAttribute("loginUser", username);
            return "redirect:/main.html";
        } else {
            model.addAttribute("msg", "用户名或密码错误！");
            return "index";
        }
    }

    @RequestMapping("/user/logout")
    public String logout(HttpSession session) {
        session.invalidate();
        return "redirect:/index.html";
    }
}

增加登录拦截器：

# src/main/java/com/wu/interceptor/LoginHandlerInterceptor .java

public class LoginHandlerInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object user = request.getSession().getAttribute("loginUser");
        if (user == null) {
            request.setAttribute("msg", "无权限请先登录");
            request.getRequestDispatcher("/index.html").forward(request, response);
            return false;
        } else {
            return true;
        }
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

将登录拦截器配置到容器中：

# src/main/java/com/wu/config/MyMvcConfig.java

@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
    // 将登录拦截器配置到容器中
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginHandlerInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/", "/index.html", "/user/login", "/css/**", "/js/**", "/img/**");
    }

    // 配置视图跳转
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("index");
        registry.addViewController("/index.html").setViewName("index");
        registry.addViewController("/main.html").setViewName("dashboard");
    }

    // 将本地化解析器配置到容器中
    @Bean
    public LocaleResolver localeResolver() {
        return new MyLocaleResolver();
    }

    // 将视图解析器配置到容器中
    @Bean
    public ViewResolver myViewResolver() {
        return new MyViewResolver();
    }
    
    // 自定义一个视图解析器
    public static class MyViewResolver implements ViewResolver {
        @Override
        public View resolveViewName(String viewName, Locale locale) throws Exception {
            return null;
        }
    }
}