注意
- 如果静态资源放到了静态资源文件夹下却无法访问，请检查一下是不是在自定义的配置类上加了@EnableWebMvc注解
- templete文件夹不是静态资源的文件夹，默认是无法访问的，所以要添加视图映射
package cn.xxxxxx.hellospringbootweb.config;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 MyMvcConfig implements WebMvcConfigurer {@Overridepublic void addViewControllers(ViewControllerRegistry registry) {registry.addViewController("/").setViewName("login");registry.addViewController("/index").setViewName("login");registry.addViewController("/index.html").setViewName("login");}
}i18n国际化
-
编写国际化配置文件，抽取页面需要显示的国际化消息
创建i18n文件夹存放配置文件，文件名格式为
基础名(login)+语言代码(zh)+国家代码(CN)
-
在配置文件中添加国际化文件的位置和基础名，如果配置文件中没有配置基础名，就在类路径下找基础名为
message的配置文件spring.messages.basename=i18n.login- 点击切换语言 修改页面，点击连接携带语言参数
<a class="btn btn-sm" href="?l=zh_CN">中文</a> <a class="btn btn-sm" href="?l=en_US">English</a>
实现登陆功能
1，提供登陆的Controller
@Controller
public class UserController {@PostMapping("/user/login")public String login(@RequestParam String username, @RequestParam String password, HttpSession session, Model model) {if (!StringUtils.isEmpty(username) && "123456".equals(password)) {//登录成功，把用户信息方法哦session中，防止表单重复提交，重定向到后台页面session.setAttribute("loginUser", username);return "redirect:/main.html";}//登录失败,返回到登录页面model.addAttribute("msg", "用户名或密码错误！");return "login";}
}
2，修改表单的提交地址，输入框添加name值与参数名称相对应
<form class="form-signin" action="dashboard.html" th:action="@{/user/login}" method="post"><img class="mb-4" 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><label class="sr-only">Username</label><input type="text" name="username" class="form-control" th:placeholder="#{login.username}" placeholder="Username" autofocus=""><label class="sr-only">Password</label><input type="password" name="password" class="form-control" th:placeholder="#{login.password}" placeholder="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" href="?l=zh_CN">中文</a><a class="btn btn-sm" href="?l=en_US">English</a></form>
3，由于登陆失败是转发，所以得修改静态资源的请求路径，在其中添加模版引擎
<link href="asserts/css/bootstrap.min.css" th:href="@{/asserts/css/bootstrap.min.css}" rel="stylesheet">
<!-- Custom styles for this template -->
<link href="asserts/css/signin.css" th:href="@{/asserts/css/signin.css}" rel="stylesheet">4，添加登陆页面的显示，将msg传回主页面
<h1 class="h3 mb-3 font-weight-normal" th:text="#{login.tip}">Please sign in</h1>
<!--msg存在才显示该p标签-->
<p th:text="${msg}" th:if="${not #strings.isEmpty(msg)}" style="color: red"></p>修改页面使其立即生效
在配置文件里面添加如下的命令，在页面修改完成之后，按快捷键ctrl+f9，重新编译
# 禁用缓存
spring.thymeleaf.cache=false拦截器进行登陆检查
1，实现拦截器
package cn.xxxxxx.hellospringbootweb.interceptor;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 {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {Object loginUser = request.getSession().getAttribute("loginUser");if (loginUser == null) {//未登录，拦截，并转发到登录页面request.setAttribute("msg", "您还没有登录，请先登录！");request.getRequestDispatcher("/index").forward(request, response);return false;}return true;}@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {}
}2，注册拦截器
package cn.clboy.hellospringbootweb.config;import cn.clboy.hellospringbootweb.interceptor.LoginHandlerInterceptor;
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 {//定义不拦截路径private static final String[] excludePaths = {"/", "/index", "/index.html", "/user/login", "/asserts/**"};@Overridepublic void addViewControllers(ViewControllerRegistry registry) {registry.addViewController("/").setViewName("login");registry.addViewController("/index").setViewName("login");registry.addViewController("/index.html").setViewName("login");registry.addViewController("/main.html").setViewName("dashboard");}@Beanpublic LocaleResolver localeResolver() {return new MyLocaleResolver();}@Overridepublic void addInterceptors(InterceptorRegistry registry) {//添加不拦截的路径，SpringBoot已经做好了静态资源映射，所以我们不用管registry.addInterceptor(new LoginHandlerInterceptor()).excludePathPatterns(excludePaths);}
}注意：在spring2.0+的版本中，只要用户自定义了拦截器，则静态资源会被拦截。但是在spring1.0+的版本中，是不会拦截静态资源的。因此我们需要将静态资源排除到拦截器的拦截路径之外
案例，实现员工的增删改查
| 实验功能 | 请求URI | 请求方式 |
|---|---|---|
| 查询所有员工 | emps | GET |
| 查询某个员工(来到修改页面) | emp/1 | GET |
| 来到添加页面 | emp | GET |
| 添加员工 | emp | POST |
| 来到修改页面（查出员工进行信息回显） | emp/1 | GET |
| 修改员工 | emp | PUT |
| 删除员工 | emp/1 | DELETE |
-
为了页面结构清晰，在template文件夹下新建emp文件夹，将list.html移动到emp文件夹下
-
将dao层和实体层java代码复制到项目中
dao，entities -
添加员工controller，实现查询员工列表的方法
@Controller public class EmpController {@Autowiredprivate EmployeeDao employeeDao;@GetMapping("/emps")public String emps(Model model) {Collection<Employee> empList = employeeDao.getAll();model.addAttribute("emps", empList);return "emp/list";}} - 修改后台页面，更改左侧的侧边栏，并修改请求路径
<li class="nav-item"><a class="nav-link" th:href="@{/emps}"><svg .....>......</svg>员工列表</a> </li>
thymeleaf公共页面元素抽取（参考官方文档）
- ~{templatename::selector}：模板名::选择器
- ~{templatename::fragmentname}:模板名::片段名
/*公共代码片段*/
<footer th:fragment="copy">© 2011 The Good Thymes Virtual Grocery
</footer>/*引用代码片段*/
<div th:insert="~{footer :: copy}"></di/*（〜{...}包围是完全可选的，所以上⾯的代码 将等价于：*/
<div th:insert="footer :: copy"></di三种引入公共片段的th属性：
th:insert：将公共片段整个插入到声明引入的元素中th:replace：将声明引入的元素替换为公共片段th:include：将被引入的片段的内容包含进这个标签中
后台页面的抽取
1，将后台主页中的顶部导航栏作为片段，在list中引入
<nav th:fragment="topbar" class="navbar navbar-dark sticky-top bg-dark flex-md-nowrap p-0"><a class="navbar-brand col-sm-3 col-md-2 mr-0" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">Company name</a><input class="form-control form-control-dark w-100" type="text" placeholder="Search" aria-label="Search"><ul class="navbar-nav px-3"><li class="nav-item text-nowrap"><a class="nav-link" href="http://getbootstrap.com/docs/4.0/examples/dashboard/#">Sign out</a></li></ul></nav>2，list.html
<body><div th:replace="dashboard::topbar"></div>......3，使用选择器的方式抽取左侧边栏的代码，就是我们将不同html文件的公共部分抽取出来，作为一个模版，其余需要的html文件只需要引入即可使用。比如现在我们将名称为sidebar的模版放在dashboard.html里面，而在list.html里面进行复用。
<!--dashboard.html-->
<div class="container-fluid"><div class="row"><nav id="sidebar" class="col-md-2 d-none d-md-block bg-light sidebar" ......<!--list.html-->
<div class="container-fluid"><div class="row"><div th:replace="dashboard::#sidebar"></div>......4，显示员工数据，添加增删改按钮
<main role="main" class="col-md-9 ml-sm-auto col-lg-10 pt-3 px-4"><h2><button class="btn btn-sm btn-success">添加员工</button></h2><div class="table-responsive"><table class="table table-striped table-sm"><thead><tr><th>员工号</th><th>姓名</th><th>邮箱</th><th>性别</th><th>部门</th><th>生日</th><th>操作</th></tr></thead><tbody><tr th:each="emp:${emps}"><td th:text="${emp.id}"></td><td th:text="${emp.lastName}"></td><td th:text="${emp.email}"></td><td th:text="${emp.gender}==1?'男':'女'"></td><td th:text="${emp.department.departmentName}"></td><td th:text="${#dates.format(emp.birth,'yyyy-MM-dd')}"></td><td><button class="btn btn-sm btn-primary">修改</button><button class="btn btn-sm btn-danger">删除</button></td></tr></tbody></table></div></main>5，员工添加页面 add.html
......
<body>
<div th:replace="commons/topbar::topbar"></div><div class="container-fluid"><div class="row"><div th:replace="commons/sidebar::#sidebar(currentURI='emps')"></div><main role="main" class="col-md-9 ml-sm-auto col-lg-10 pt-3 px-4"><form><div class="form-group"><label>LastName</label><input name="lastName" type="text" class="form-control" placeholder="zhangsan"></div><div class="form-group"><label>Email</label><input name="email" type="email" class="form-control" placeholder="zhangsan@atguigu.com"></div><div class="form-group"><label>Gender</label><br/><div class="form-check form-check-inline"><input class="form-check-input" type="radio" name="gender" value="1"><label class="form-check-label">男</label></div><div class="form-check form-check-inline"><input class="form-check-input" type="radio" name="gender" value="0"><label class="form-check-label">女</label></div></div><div class="form-group"><label>department</label><select name="department.id" class="form-control"><option th:each="dept:${departments}" th:text="${dept.departmentName}" th:value="${dept.id}"></option></select></div><div class="form-group"><label>Birth</label><input name="birth" type="text" class="form-control" placeholder="zhangsan"></div><button type="submit" class="btn btn-primary">添加</button></form></main></div>
</div>
......6，点击链接，跳转到添加页面
<a href="/emp" th:href="@{/emp}" class="btn btn-sm btn-success">添加员工</a>7，EmpController添加映射方法
@Autowiredprivate DepartmentDao departmentDao;@GetMapping("/emp")public String toAddPage(Model model) {//准备部门下拉框数据Collection<Department> departments = departmentDao.getDepartments();model.addAttribute("departments",departments);return "emp/add";}8， 修改页面遍历添加下拉选项
<select class="form-control"><option th:each="dept:${departments}" th:text="${dept.departmentName}"></option>
</select>9，表单提交，添加员工
<form th:action="@{/emp}" method="post"> @PostMapping("/emp")public String add(Employee employee) {System.out.println(employee);//模拟添加到数据库employeeDao.save(employee);//添加成功重定向到列表页面return "redirect:/emps";}10，日期格式的修改
表单提交的格式必须是yyyy/MM/dd的格式，可以在配置文件中修改格式
spring.mvc.date-format=yyyy-MM-dd员工修改
- 点击按钮跳转到编辑页面
<a th:href="@{/emp/}+${emp.id}" class="btn btn-sm btn-primary">修改</a> - 添加编辑页面，将表单的提交方式设置为post方式，提供_method参数
<body> <div th:replace="commons/topbar::topbar"></div><div class="container-fluid"><div class="row"><div th:replace="commons/sidebar::#sidebar(currentURI='emps')"></div><main role="main" class="col-md-9 ml-sm-auto col-lg-10 pt-3 px-4"><form th:action="@{/emp}" method="post"><!--员工id--><input type="hidden" name="id" th:value="${emp.id}"><!--http请求方式--><input type="hidden" name="_method" value="put"><div class="form-group"><label>LastName</label><input name="lastName" th:value="${emp.lastName}" type="text" class="form-control" placeholder="zhangsan"></div><div class="form-group"><label>Email</label><input name="email" th:value="${emp.email}" type="email" class="form-control" placeholder="zhangsan@atguigu.com"></div><div class="form-group"><label>Gender</label><br/><div class="form-check form-check-inline"><input class="form-check-input" type="radio" name="gender" value="1" th:checked="${emp.gender==1}"><label class="form-check-label">男</label></div><div class="form-check form-check-inline"><input class="form-check-input" type="radio" name="gender" value="0" th:checked="${emp.gender==0}"><label class="form-check-label">女</label></div></div><div class="form-group"><label>department</label><select name="department.id" class="form-control"><option th:each="dept:${departments}" th:value="${dept.id}" th:selected="${dept.id}==${emp.department.id}" th:text="${dept.departmentName}"></option></select></div><div class="form-group"><label>Birth</label><input name="birth" type="text" class="form-control" placeholder="zhangsan" th:value="${#dates.format(emp.birth,'yyyy-MM-dd')}"></div><button type="submit" class="btn btn-primary">添加</button></form></main></div> </div>...... - controller转发到编辑页面，回显员工信息
@GetMapping("/emp/{id}")public String toEditPage(@PathVariable Integer id, Model model) {Employee employee = employeeDao.get(id);//准备部门下拉框数据Collection<Department> departments = departmentDao.getDepartments();model.addAttribute("emp", employee).addAttribute("departments", departments);return "emp/edit";} - 提交表单修改员工的信息
@PutMapping("/emp")public String update(Employee employee) {employeeDao.save(employee);return "redirect:/emps";}
员工删除
- 点击删除提交发出delete请求
@DeleteMapping("/emp/{id}")public String delete(@PathVariable String id){employeeDao.delete(id);return "redirect:/emps";} - 如果提示不支持POST请求，在确保代码无误的情况下查看是否配置启动
HiddenHttpMethodFilter -
这个好像是2.0版本以后修改的 spring.mvc.hiddenmethod.filter.enabled=true
-
如果删除不掉，请修改
EmployeeDao，把String转为Integer类型public void delete(String id) {employees.remove(Integer.parseInt(id));}
