springboot基础--实现默认登录页面-编程知识

1、搭建项目

依赖中多加入thymeleaf依赖

<dependencies><!--thymeleaf的依赖--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId></dependency><!--web工程的依赖--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--单元测试的依赖--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies>

application.properties

#关闭thymeleaf的缓存，避免开发过程中修改页面不生效的情况，在部署的时候可以取消
spring.thymeleaf.cache=false

2、导入静态资源

在这里插入图片描述

src/main/resources/templates/login.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>登陆页面</title><!-- jQuery文件。务必在bootstrap.min.js 之前引入 --><script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script><!-- 新 Bootstrap4 核心 CSS 文件 --><link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.1.0/css/bootstrap.min.css"><!-- popper.min.js 用于弹窗、提示、下拉菜单 --><script src="https://cdn.staticfile.org/popper.js/1.12.5/umd/popper.min.js"></script><!-- 最新的 Bootstrap4 核心 JavaScript 文件 --><script src="https://cdn.staticfile.org/twitter-bootstrap/4.1.0/js/bootstrap.min.js"></script>
</head>
<body><div class="container"><h2>登录</h2><form method="post" action="#" th:action="@{/user/login}"><div class="form-group has-feedback"><label for="用户名">用户名:</label><input th:value="${username}" type="text" name="username"  class="form-control" id="username" placeholder="请输入用户名"></div><div class="form-group has-feedback"><label for="pwd">密码:</label><input type="password" name="password" class="form-control" id="pwd" placeholder="请输入密码"><span th:text="${login_error}" class="glyphicon glyphicon-envelope form-control-feedback"></span></div><div class="form-check"><label class="form-check-label"><input class="form-check-input" type="checkbox"> 记住我</label></div><button type="submit" class="btn btn-primary">登录</button><button type="button" class="btn btn-primary">注册</button></form></div>
</body>
</html>

src/main/resources/templates/list.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>Title</title><title>登陆页面</title><!-- jQuery文件。务必在bootstrap.min.js 之前引入 --><script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script><!-- 新 Bootstrap4 核心 CSS 文件 --><link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.1.0/css/bootstrap.min.css"><!-- popper.min.js 用于弹窗、提示、下拉菜单 --><script src="https://cdn.staticfile.org/popper.js/1.12.5/umd/popper.min.js"></script><!-- 最新的 Bootstrap4 核心 JavaScript 文件 --><script src="https://cdn.staticfile.org/twitter-bootstrap/4.1.0/js/bootstrap.min.js"></script><script>$(function(){$("button:contains('删除')").click(function(){$.post("/user/delete",{"id":this.id});$(this).parent().parent().remove();});$("button:contains('修改')").click(function(){//弹出修改窗口$('#myModal').modal();//把User对象转成json对象var jsonObj = JSON.parse($(this).attr("id"));//为修改页面进行赋值$('#txt_id').val(jsonObj['id']);$('#txt_username').val(jsonObj['username']);$('#txt_password').val(jsonObj['password']);$('#txt_name').val(jsonObj['name']);$('#txt_userSex').val(jsonObj['userSex']);});})//添加的方法function add() {//弹出新建窗口$('#myModal1').modal();}</script>
</head>
<body>
<div class="container"><table class="table table-dark table-hover"><thead><tr><th>id</th><th>用户名</th><th>密码</th><th>真实姓名</th><th>性别</th><th>删除</th><th>修改</th></tr></thead><tbody><tr th:each="users:${list}"><td th:text="${users.id}"></td><td th:text="${users.username}"></td><td th:text="${users.password}"></td><td th:text="${users.name}"></td><td th:text="${users.userSex}"></td><th><button th:id="${users.id}" onclick="return confirm('你确定要删除这条数据吗？')">删除</button></th><th><button th:id="${users}">修改</button></th></tr></tbody></table><button onclick="add()">添加</button><!--添加页面--><div class="modal fade" id="myModal1" tabindex="-1" role="dialog" aria-labelledby="myModalLabel"><div class="modal-dialog" role="document"><div class="modal-content"><form method="post" action="#" th:action="@{/add.do}"><div class="modal-header"><button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button><h4 class="modal-title" id="myModalLabel1">添加</h4></div><div class="modal-body"><div class="form-group"><label for="txt_username">用户名</label><input type="text" name="username" class="form-control" placeholder="用户名"></div><div class="form-group"><label for="txt_password">密码</label><input type="password" name="password" class="form-control" placeholder="密码"></div><div class="form-group"><label for="txt_name">真实姓名</label><input type="text" name="name" class="form-control" placeholder="真实姓名"></div><div class="form-group"><label for="txt_userSex">性别</label><input type="text" name="userSex" class="form-control" placeholder="性别"></div></div><div class="modal-footer"><button type="button" class="btn btn-default" data-dismiss="modal"><span class="glyphicon glyphicon-remove" aria-hidden="true"></span>关闭</button><input type="submit" value="保存" id="btn_submit1" class="btn btn-primary" /><span class="glyphicon glyphicon-floppy-disk" aria-hidden="true"></span></div></form></div></div></div><!--修改页面--><div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel"><div class="modal-dialog" role="document"><div class="modal-content"><form method="post" action="#" th:action="@{/update.do}"><div class="modal-header"><button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button><h4 class="modal-title" id="myModalLabel">修改</h4></div><div class="modal-body"><input type="text" name="id" id="txt_id" hidden="true"><div class="form-group"><label for="txt_username">用户名</label><input type="text" name="username" class="form-control" id="txt_username" placeholder="用户名"></div><div class="form-group"><label for="txt_password">密码</label><input type="password" name="password" class="form-control" id="txt_password" placeholder="密码"></div><div class="form-group"><label for="txt_name">真实姓名</label><input type="text" name="name" class="form-control" id="txt_name" placeholder="真实姓名"></div><div class="form-group"><label for="txt_userSex">性别</label><input type="text" name="userSex" class="form-control" id="txt_userSex" placeholder="性别"></div></div><div class="modal-footer"><button type="button" class="btn btn-default" data-dismiss="modal"><span class="glyphicon glyphicon-remove" aria-hidden="true"></span>关闭</button><input type="submit" value="保存" id="btn_submit" class="btn btn-primary" /><span class="glyphicon glyphicon-floppy-disk" aria-hidden="true"></span></div></form></div></div></div>
</div>
</body>
</html>

127.0.0.1:8080/login.html 进行页面访问，但是无法访问，因为templates下的文件都是被保护的

只能通过controller的方式访问

在这里插入图片描述

通过control访问

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;@Controller
public class LoginController {@RequestMapping("/test")public String test(){return "login";}}

http://127.0.0.1:8080/test 访问测试成功

在这里插入图片描述

3、自定义mvc配置方式默认主页

src/main/java/com/franklin/springbootwebdemo/config/WebMvcConfig.java

通过修改WebMvcConfigure的默认设置来指定页面的默认访问方式
1、构建一个配置类,实现WebMvcConfigurer接口，重写addViewControllers方法;
2、添加自定义页面的默认主页映射: addViewController().setViewName()


import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configuration
public class WebMvcConfig implements WebMvcConfigurer {@Overridepublic void addViewControllers(ViewControllerRegistry registry) {//转发registry.addViewController("/").setViewName("login.html");
//        registry.addViewController("/main.html").setViewName("/list.do");//重定向
//        registry.addRedirectViewController("/main.html","list.do");}}

测试访问登录http://127.0.0.1:8080/

在这里插入图片描述

注意此时http://127.0.0.1:8080/test 还可以访问成功

4、升级controller

package com.franklin.springbootwebdemo.controller;import com.franklin.springbootwebdemo.entity.Users;
import com.franklin.springbootwebdemo.repository.UsersRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.thymeleaf.util.StringUtils;import javax.servlet.http.HttpSession;@Controller
public class LoginController {@Autowiredprivate UsersRepository usersRepository;@RequestMapping("/user/login")public String login(ModelMap map, Users users, HttpSession session){map.addAttribute("username",users.getUsername());//进行用户名密码的校验if(!StringUtils.isEmpty(users.getUsername())&&!StringUtils.isEmpty(users.getPassword())&&"zhangsan".equals(users.getUsername())&&"123456".equals(users.getPassword())){//登录成功，把当前user对象注入到session中，进入拦截器里配置session.setAttribute("userInfo",users);return "list";}else{map.addAttribute("login_error","用户名密码错误");return "login";}}}

5、 repository类

src/main/java/com/hckj/managersystemdemo/repository/UsersRepository.java


package com.franklin.springbootwebdemo.repository;import com.franklin.springbootwebdemo.entity.Users;import java.util.List;public interface UsersRepository {List<Users> findAll();int deleteUserById(int id);
}

src/main/java/com/hckj/managersystemdemo/repository/UserRepositoryImp.java

package com.franklin.springbootwebdemo.repository;import com.franklin.springbootwebdemo.entity.Users;
import org.springframework.stereotype.Repository;import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;@Repository
public class UserRepositoryImp implements UsersRepository {static List<Users> users = new ArrayList<>();static{Collections.addAll(users,new Users(1001,"zhangsan","123456","张三","男"),new Users(1002,"lisi","123456","李四","女"),new Users(1003,"wangwu","123456","王五","男"),new Users(1004,"zhaoliu","123456","赵柳","女"),new Users(1005,"wangba","123456","网吧","男"));}@Overridepublic List<Users> findAll() {return users;}@Overridepublic int deleteUserById(int id) {int num = 0;Iterator<Users> iterator = users.iterator();while(iterator.hasNext()){Users users = iterator.next();if (users.getId()==id){iterator.remove();num = 1;}}return num;}
}

登录http://127.0.0.1:8080/ 输入账号：admin 密码12345

在这里插入图片描述

登录http://127.0.0.1:8080/ 输入账号：zhangsan 密码123456

在这里插入图片描述

6、第二次升级controller

@Controller
public class LoginController {@Autowiredprivate UsersRepository usersRepository;@RequestMapping("/user/login")public String login(ModelMap map, Users users, HttpSession session){map.addAttribute("username",users.getUsername());//进行用户名密码的校验if(!StringUtils.isEmpty(users.getUsername())&&!StringUtils.isEmpty(users.getPassword())&&"zhangsan".equals(users.getUsername())&&"123456".equals(users.getPassword())){//登录成功，把当前user对象注入到session中，进入拦截器里配置session.setAttribute("userInfo",users);return "redirect:/user/list";}else{map.addAttribute("login_error","用户名密码错误");return "login.html";}}@RequestMapping("/user/list")public String show(ModelMap map){List<Users> list = usersRepository.findAll();map.addAttribute("list",list);return "list.html";}}

登录http://127.0.0.1:8080/ 输入账号：zhangsan 密码123456

外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传

7、数据展示和删除

    <script>$(function(){$("button:contains('删除')").click(function(){$.post("/user/delete",{"id":this.id});$(this).parent().parent().remove();});$("button:contains('修改')").click(function(){//弹出修改窗口$('#myModal').modal();//把User对象转成json对象var jsonObj = JSON.parse($(this).attr("id"));//为修改页面进行赋值$('#txt_id').val(jsonObj['id']);$('#txt_username').val(jsonObj['username']);$('#txt_password').val(jsonObj['password']);$('#txt_name').val(jsonObj['name']);$('#txt_userSex').val(jsonObj['userSex']);});})//添加的方法function add() {//弹出新建窗口$('#myModal1').modal();}</script>

8、第三次升级controller

src/main/java/com/hckj/managersystemdemo/controller/LoginController.java

加入

    @RequestMapping("/user/list")public String show(ModelMap map){List<Users> list = usersRepository.findAll();map.addAttribute("list",list);return "list.html";}  @RequestMapping("/user/delete")public String delete(int id){usersRepository.deleteUserById(id);return "list";}

9、拦截器

src/main/java/com/hckj/managersystemdemo/intercept/LoginHandlerIntercept.java

package com.franklin.springbootwebdemo.intercept;import com.franklin.springbootwebdemo.entity.Users;
import org.springframework.web.servlet.HandlerInterceptor;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class LoginHandlerIntercept implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {Users users = (Users) request.getSession().getAttribute("userInfo");if (users!=null){return true;}else{request.setAttribute("login_error","请先登录");request.getRequestDispatcher("/").forward(request,response);return false;}}
}

src/main/java/com/franklin/springbootwebdemo/config/WebMvcConfig.java

加入

@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(new LoginHandlerIntercept()).addPathPatterns("/**").excludePathPatterns("/","/eitilogin.html","/user/login","/css/**","js/**","img/**");}