10.1 登录功能

---

登录的太好写了，对于我们 已经 写过 很多 这种 请求的代码的人来说。不要太简单了。。

1. 首先为 表单 设置上 请求
   
2. 编写 Controller

package top.muquanyu.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.thymeleaf.util.StringUtils;

@Controller
public class LoginController {
    @RequestMapping("/user/login")
    public String login(@RequestParam("username") String username,
                        @RequestParam("password") String password,
                        Model model
                        ){

        // 写死一个测试的假数据
        if(!StringUtils.isEmpty(username) && "123456".equals(password)){
            return "dashboard";
        }else{
            // 告诉 用户，你登录失败了
            model.addAttribute("msg","用户名或者密码错误！");
            return "index";
        }

    }
}
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我们这个地方 也可以 用 工具类 string.isEmpty()。但实际上 是不需要的。

3. 隐藏请求的资源文件为其他的名字

---

10.2 登录拦截器

做 Filter 过滤嘛。哈哈。因为 我们现在 开发的 也是依赖于 MVC 的。所以直接 写 一个 拦截器就行。

1. 先 设置一个 Session

2. 写一个 MVC 的拦截器

package top.muquanyu.config;

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

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

public class LoginHandlerIntercepter implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //return HandlerInterceptor.super.preHandle(request, response, handler);

        HttpSession session = request.getSession();
        Object userInfo = session.getAttribute("userInfo");

        if(userInfo != null){
            return true;
        }

        request.setAttribute("msg","没有权限，请先登录");
        request.getRequestDispatcher("/index.html").forward(request,response);

        return false;

    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
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3. 在 MVC 拓展配置那里，我们 添加 这个拦截器

package top.muquanyu.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.HandlerInterceptor;
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 MvcConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //WebMvcConfigurer.super.addInterceptors(registry);
        registry.addInterceptor(new LoginHandlerIntercepter()).
                addPathPatterns("/**").
                excludePathPatterns("/index.html","/","/user/login","/css/**","/js/**","/img/**");
    }

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        //WebMvcConfigurer.super.addViewControllers(registry);
        registry.addViewController("/").setViewName("index");
        registry.addViewController("/index.html").setViewName("index");
        registry.addViewController("/main.html").setViewName("dashboard.html");
    }



    // 自定义 的 国际化 组件 就 生效了
    @Bean
    public LocaleResolver localeResolver(){
        return new MyLocaleResolver();
    }
}
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核心 代码 就是下面这条 语句：

registry.addInterceptor(拦截器对象).addPathPatterns("拦截的url请求").excludePathPatterns("不拦截的请求A","不拦截的请求B");