【springboot__拦截器】Interceptor

LoginHandlerInterceptor

package k.component;

import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

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) {
            //未登陆，返回登陆页面
            request.setAttribute("msg", "没有权限请先登陆");
            request.getRequestDispatcher("/index.html").forward(request, response);
            return false;
        } else {
            //已登陆，放行请求
            return true;
        }
    }
}

MyMvcConfig

package k.config;

import k.component.LoginHandlerInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.*;

@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("login");
        registry.addViewController("/index.html").setViewName("login");
        registry.addViewController("/main.html").setViewName("dashboard");
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        //其他静态资源，与本文关系不大
        // registry.addResourceHandler("/upload/**").addResourceLocations("file:"+ TaleUtils.getUplodFilePath()+"upload/");

        //需要配置1：----------- 需要告知系统，这是要被当成静态文件的！
        //第一个方法设置访问路径前缀，第二个方法设置资源路径
        // registry.addResourceHandler("/asserts/**").addResourceLocations("classpath:/static/asserts");
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //super.addInterceptors(registry);
        //静态资源；  *.css , *.js
        // SpringBoot2.x静态资源映射 /asserts/**
        registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**")
                .excludePathPatterns("/index.html", "/", "/user/login", "/asserts/**");
    }
}