springboot简单项目(4) 登录拦截器

在登录控制类实现变成session

package com.jie.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpSession;

@Controller
public class LoginController {
    @RequestMapping("/usr/login")
    public String login(@RequestParam("username") String username, @RequestParam("password") String password, Model model, HttpSession session){
        //具体的业务:
        if("123456".equals(password)){
            session.setAttribute("loginUser",username);
            return "redirect:/main.html";
        }
        else {
            model.addAttribute("msg","用户名密码错误!");
            return "index";
        }
    }
}

编写一个拦截器类

package com.jie.config;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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 {
        //登录成功之后,应该有用户的session
        Object loginUser=request.getSession().getAttribute("loginUser");
        if(null==loginUser) {
            request.setAttribute("msg", "你未登录,请先登录!");
            request.getRequestDispatcher("/index.html").forward(request, response);
            return false;
        }
        else {
            return true;
        }
    }

}

在配置类加入自定义的拦截器类

同时设置静态资源,登录页面不被拦截

package com.jie.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("index");
        registry.addViewController("/index.html").setViewName("index");
        registry.addViewController("/main.html").setViewName("dashboard");
    }
    @Bean
    public LocaleResolver localeResolver(){
        return new MyLocaleResolver();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginHandlerInterceptor())
                .addPathPatterns("/**").excludePathPatterns("/index.html","/","/usr/login","/static/*");
    }
}