登陆

开发期间模板引擎页面修改以后，要实时生效

1）、禁用模板引擎的缓存

# 禁用缓存

spring.thymeleaf.cache=false

2）、页面修改完成以后ctrl+f9：重新编译；

登陆错误消息的显示

<p style="color: red" th:text="${msg}" th:if="${not #strings.isEmpty(msg)}"></p>

login.html

<!DOCTYPE html>

<html lang="en"  xmlns:th="http://www.thymeleaf.org">

    <head>

        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

        <meta name="description" content="">

        <meta name="author" content="">

        <title>Signin Template for Bootstrap</title>

        <!-- Bootstrap core CSS -->

        <link href="asserts/css/bootstrap.min.css" th:href="@{/webjars/bootstrap/4.0.0/css/bootstrap.css}" rel="stylesheet">

        <!-- Custom styles for this template -->

        <link href="asserts/css/signin.css" th:href="@{/asserts/css/signin.css}" rel="stylesheet">

    </head>

    <body class="text-center">

        <form class="form-signin" action="dashboard.html" th:action="@{/user/login}" method="post">

            <img class="mb-4" th:src="@{/asserts/img/bootstrap-solid.svg}" src="asserts/img/bootstrap-solid.svg" alt="" width="72" height="72">

            <h1 class="h3 mb-3 font-weight-normal" th:text="#{login.tip}">Please sign in</h1>

            <!--判断-->

            <p style="color: red" th:text="${msg}" th:if="${not #strings.isEmpty(msg)}"></p>

            <label class="sr-only" th:text="#{login.username}">Username</label>

            <input type="text"  name="username" class="form-control" placeholder="Username" th:placeholder="#{login.username}" required="" autofocus="">

            <label class="sr-only" th:text="#{login.password}">Password</label>

            <input type="password" name="password" class="form-control" placeholder="Password" th:placeholder="#{login.password}" required="">

            <div class="checkbox mb-3">

                <label>

                      <input type="checkbox" value="remember-me"/> [[#{login.remember}]]

                </label>

            </div>

            <button class="btn btn-lg btn-primary btn-block" type="submit" th:text="#{login.btn}">Sign in</button>

            <p class="mt-5 mb-3 text-muted">© 2017-2018</p>

            <a class="btn btn-sm" th:href="@{/index.html(l='zh_CN')}">中文</a>

            <a class="btn btn-sm" th:href="@{/index.html(l='en_US')}">English</a>

        </form>

    </body>

</html>

4）、Controller层

LoginController:

package com.atguigu.springboot.controller;

import org.springframework.stereotype.Controller;

import org.springframework.util.StringUtils;

import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpSession;

import java.util.Map;

@Controller

public class LoginController {

//    @DeleteMapping

//    @PutMapping

//    @GetMapping

    //@RequestMapping(value = "/user/login",method = RequestMethod.POST)

    @PostMapping(value = "/user/login")

    public String login(@RequestParam("username") String username,

                        @RequestParam("password") String password,

                        Map<String,Object> map, HttpSession session){

        if(!StringUtils.isEmpty(username) && "123456".equals(password)){

            //登陆成功，防止表单重复提交，可以重定向到主页

            session.setAttribute("loginUser",username);

            return "redirect:/main.html";

        }else{

            //登陆失败

            map.put("msg","用户名密码错误");

            return  "login";

        }

    }

}

4）、拦截器进行登陆检查

拦截器

package com.atguigu.springboot.component;

import org.springframework.web.servlet.HandlerInterceptor;

import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * 登陆检查，

 */

public class LoginHandlerInterceptor implements HandlerInterceptor {

    //目标方法执行之前

    @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;

        }

    }

    @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 {

    }


}

注册拦截器：
package com.atguigu.springboot.config;

import com.atguigu.springboot.component.LoginHandlerInterceptor;
import com.atguigu.springboot.component.MyLocaleResolver;
import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer;
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
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.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

//使用WebMvcConfigurerAdapter可以来扩展SpringMVC的功能
//@EnableWebMvc   //不要接管SpringMVC
@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
       // super.addViewControllers(registry);
        //浏览器发送 /atguigu 请求来到 success
        registry.addViewController("/atguigu").setViewName("success");
    }

    //所有的WebMvcConfigurerAdapter组件都会一起起作用
    @Bean //将组件注册在容器
    public WebMvcConfigurerAdapter webMvcConfigurerAdapter(){
        WebMvcConfigurerAdapter adapter = new WebMvcConfigurerAdapter() {
            @Override
            public void addViewControllers(ViewControllerRegistry registry) {
                registry.addViewController("/").setViewName("login");
                registry.addViewController("/index.html").setViewName("login");
                registry.addViewController("/main.html").setViewName("dashboard");
            }

            //注册拦截器
            @Override
            public void addInterceptors(InterceptorRegistry registry) {
                //super.addInterceptors(registry);
                //静态资源；  *.css , *.js
                //SpringBoot已经做好了静态资源映射
                registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**")
                        .excludePathPatterns("/index.html","/","/user/login");
            }
        };
        return adapter;
    }

    @Bean
    public LocaleResolver localeResolver(){

        return new MyLocaleResolver();
    }

}

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