一、默认访问首页

  1、方式一:在 controller 中添加一个方法来进行映射处理

    @RequestMapping(value = {"/", "/index.html"}, method = RequestMethod.GET)
    public String login() {
        return "login";
    }

 

  2、方式二:在配置类中添加视图映射 view-controller

@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {

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

}

 

 

二、国际化

  SpringMVC 国际化:

  (1)编写国际化配置文件;

  (2)使用ResourceBundleMessageSource管理国际化资源文件;

  (3)在页面使用fmt:message取出国际化内容;

  1、编写国际化配置文件,编写国际化配置文件,抽取页面需要显示的国际化消息

    

 

    login.properties

login.btn=登陆
login.password=密码
login.remember=记住我
login.tip=请登陆
login.username=用户名

 

   login_zh_CN.properties

login.btn=登陆
login.password=密码
login.remember=记住我
login.tip=请登陆
login.username=用户名

 

   login_en_US.properties

login.btn=Sign in
login.password=Password
login.remember=Remember me
login.tip=Please sign in
login.username=Username

 

  2、SpringBoot自动配置好了管理国际化资源文件的组件;

@ConfigurationProperties(prefix = "spring.messages")
public class MessageSourceAutoConfiguration {
    
    /**
     * Comma-separated list of basenames (essentially a fully-qualified classpath
     * location), each following the ResourceBundle convention with relaxed support for
     * slash based locations. If it doesn't contain a package qualifier (such as
     * "org.mypackage"), it will be resolved from the classpath root.
     */
    private String basename = "messages";  
    //我们的配置文件可以直接放在类路径下叫 messages.properties;
    
    @Bean
    public MessageSource messageSource() {
        ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
        if (StringUtils.hasText(this.basename)) {
            //设置国际化资源文件的基础名(去掉语言国家代码的)
            messageSource.setBasenames(StringUtils.commaDelimitedListToStringArray(
                    StringUtils.trimAllWhitespace(this.basename)));
        }
        if (this.encoding != null) {
            messageSource.setDefaultEncoding(this.encoding.name());
        }
        messageSource.setFallbackToSystemLocale(this.fallbackToSystemLocale);
        messageSource.setCacheSeconds(this.cacheSeconds);
        messageSource.setAlwaysUseMessageFormat(this.alwaysUseMessageFormat);
        return messageSource;
    }
}

 

    去配置文件中指定basename:

#https://blog.csdn.net/weixin_44606513/article/details/105962383
#国际化配置文件(包名.基础名)或者(包名/基础名)
spring.messages.basename=i18n/login

 

  3、去页面获取国际化的值;

<!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">
            <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>
            <label class="sr-only" th:text="#{login.username}">Username</label>
            <input type="text" class="form-control" placeholder="Username" th:placeholder="#{login.username}" required="" autofocus="">
            <label class="sr-only" th:text="#{login.password}">Password</label>
            <input type="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">中文</a>
            <a class="btn btn-sm">English</a>
        </form>

    </body>

</html>

 

    效果:根据浏览器语言设置的信息切换了国际化;

    原理:国际化Locale(区域信息对象);LocaleResolver(获取区域信息对象);

        @Bean
        @ConditionalOnMissingBean
        @ConditionalOnProperty(prefix = "spring.mvc", name = "locale")
        public LocaleResolver localeResolver() {
            if (this.mvcProperties
                    .getLocaleResolver() == WebMvcProperties.LocaleResolver.FIXED) {
                return new FixedLocaleResolver(this.mvcProperties.getLocale());
            }
             //默认的就是根据请求头带来的区域信息获取Locale进行国际化
            AcceptHeaderLocaleResolver localeResolver = new AcceptHeaderLocaleResolver();
            localeResolver.setDefaultLocale(this.mvcProperties.getLocale());
            return localeResolver;
        }

 

  4、点击链接切换国际化

    通过页面传递参数:

<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>

 

    自定义一个国际化解析器,并加入到容器中:

/**
 * 可以在连接上携带区域信息
 */
public class MyLocaleResolver implements LocaleResolver {
    
    @Override
    public Locale resolveLocale(HttpServletRequest request) {
        String l = request.getParameter("l");
        Locale locale = Locale.getDefault();
        if(!StringUtils.isEmpty(l)){
            String[] split = l.split("_");
            locale = new Locale(split[0],split[1]);
        }
        return locale;
    }

    @Override
    public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {

    }
}

//自定义区域化解析器
@Bean
public LocaleResolver localeResolver(){
  return new MyLocaleResolver();
}

 

三、登录

  1、登录表单

    <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,判断条件成立标签才生效-->
            <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" class="form-control" name="username" th:placeholder="#{login.username}" placeholder="Username" required="" autofocus="">
            <label class="sr-only" th:text="#{login.password}">Password</label>
            <input type="password" class="form-control" name="password" 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" 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>

 

  2、登录的控制器

@Controller
public class LoginController {


    //@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) {

        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
            return "redirect:/main.html";
        } else {
            //登陆失败
            map.put("msg", "用户名或密码错误!");
            return "login";
        }
    }
}

    添加到主页的视图映射

@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {

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

 

  3、禁用模板引擎的缓存

# 禁用缓存
spring.thymeleaf.cache=false 

 

  4、登陆错误消息的显示

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

  

四、拦截器进行登陆检查

  1、修改登录控制器方法

@Controller
public class LoginController {

    //@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)) {
            session.setAttribute("loginUser", username);
            //登陆成功,防止表单重复提交,可以重定向到主页
            return "redirect:/main.html";
        } else {
            //登陆失败
            map.put("msg", "用户名或密码错误!");
            return "login";
        }
    }
}

 

  2、新增登录拦截器

/**
 * 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 loginUser = request.getSession().getAttribute("loginUser");
        if (loginUser == null) {
            //未登录,返回登陆页面
            //转发到登录页面
            request.setAttribute("msg", "没有权限请先登录");
            request.getRequestDispatcher("/").forward(request, response);
            return false;
        } else {
            //已登录,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 {

    }
}

 

  3、把拦截器添加到容器中

@Configuration
public class MyMvcConfig extends WebMvcConfigurerAdapter {

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

    //区域化解析器
    @Bean
    public LocaleResolver localeResolver(){
        return new MyLocaleResolver();
    }


}

 

 

五、Restful 案例

  1、实验要求

    (1)Restful CRUD

      URI/资源名称/资源标识 HTTP请求方式区分对资源CRUD操作

操作普通CRUD(uri来区分操作)RestfulCRUD
查询 getEmp emp---GET
添加 addEmp?xxx emp---POST
修改 updateEmp?id=xxx&xxx=xx emp/{id}---PUT
删除 deleteEmp?id=1 emp/{id}---DELETE

 

    (2)请求架构

      

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

      

  2、员工列表

    (1)页面请求

<a class="nav-link" href="#" th:href="@{/emps}">员工列表</a>

 

    (2)控制器方法

    //查询所有员工信息返回列表页面
    @GetMapping(value = "/emps")
    public String list(Model model) {
        Collection<Employee> emps = employeeDao.getAll();

        //放在请求与中
        model.addAttribute("emps", emps);

        //Thymeleaf 默认就会拼串  public static final String DEFAULT_PREFIX = "classpath:/templates/";
        // classpath:/templates/emp/list.html
        return "emp/list";
    }

 

    (3)页面遍历显示(emp/list.html)

<div class="table-responsive">
    <table class="table table-striped table-sm">
        <thead>
            <tr>
                <th>Id</th>
                <th>LastName</th>
                <th>Email</th>
                <th>Gender</th>
                <th>Deptment</th>
                <th>Birth</th>
                <th>操作</th>
            </tr>
        </thead>
        <tbody>
            <tr th:each="emp : ${emps}">
                <td th:text="${emp.id}"></td>
                <td>[[${emp.lastName}]]</td>
                <td th:text="${emp.email}"></td>
                <td th:text="${emp.gender} == 0 ? '女' : '男'"></td>
                <td th:text="${emp.department.departmentName}"></td>
                <td th:text="${#dates.format(emp.birth, 'yyyy-MM-dd HH:mm')}"></td>
                <td>
                    <button class="btn btn-sm btn-primary">编辑</button>
                    <button class="btn btn-sm btn-danger">删除</button>
                </td>
            </tr>
        </tbody>
    </table>
</div>

 

    (4)thymeleaf公共页面元素抽取

1、抽取公共片段
<div th:fragment="copy">
&copy; 2011 The Good Thymes Virtual Grocery
</div>

2、引入公共片段
<div th:insert="~{footer :: copy}"></div>
~{templatename::selector}:模板名::选择器
~{templatename::fragmentname}:模板名::片段名

3、默认效果:
insert的公共片段在div标签中
如果使用th:insert等属性进行引入,可以不用写~{}:
行内写法可以加上:[[~{}]];[(~{})];

 

     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

    

    示例:

<footer th:fragment="copy">
&copy; 2011 The Good Thymes Virtual Grocery
</footer>

引入方式
<div th:insert="footer :: copy"></div>
<div th:replace="footer :: copy"></div>
<div th:include="footer :: copy"></div>

效果
<div>
    <footer>
    &copy; 2011 The Good Thymes Virtual Grocery
    </footer>
</div>

<footer>
&copy; 2011 The Good Thymes Virtual Grocery
</footer>

<div>
&copy; 2011 The Good Thymes Virtual Grocery
</div>

 

    引用片段的时候传入参数:

<nav class="col-md-2 d-none d-md-block bg-light sidebar" id="sidebar">
    <div class="sidebar-sticky">
        <ul class="nav flex-column">
            <li class="nav-item">
                <a class="nav-link active"
                   th:class="${activeUri=='main.html'?'nav-link active':'nav-link'}"
                   href="#" th:href="@{/main.html}">
                    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-home">
                        <path d="M3 9l9-7 9 7v11a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z"></path>
                        <polyline points="9 22 9 12 15 12 15 22"></polyline>
                    </svg>
                    Dashboard <span class="sr-only">(current)</span>
                </a>
            </li>

<!--引入侧边栏;传入参数-->
<div th:replace="commons/bar::#sidebar(activeUri='emps')"></div>

 

 

  3、员工添加

    (1)跳转至添加页面

      页面请求:

<a class="btn btn-sm btn-success" href="emp" th:href="@{/emp}">添加</a>

 

      控制器方法:

    //跳转到添加页面
    @GetMapping(value = "/emp")
    public String toAddPage(Model model) {
        Collection<Department> departments = departmentDao.getDepartments();

        //把部门信息放在请求域中
        model.addAttribute("depts", departments);

        return "emp/add";
    }

 

    (2)添加页面

<form>
    <div class="form-group">
        <label>LastName</label>
        <input type="text" class="form-control" placeholder="zhangsan">
    </div>
    <div class="form-group">
        <label>Email</label>
        <input 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 class="form-control">
            <option>1</option>
            <option>2</option>
            <option>3</option>
            <option>4</option>
            <option>5</option>
        </select>
    </div>
    <div class="form-group">
        <label>Birth</label>
        <input type="text" class="form-control" placeholder="zhangsan">
    </div>
    <button type="submit" class="btn btn-primary">添加</button>
</form>

 

    (3)添加方法

    //SpringMVC 自动将请求参数的入参对象的属性进行一一绑定,要求了请求参数的名字和JavaBean入参的对象里面属性名一致
    @PostMapping(value = "/emp")
    public String addEmp(Employee employee) {
        System.out.println("保存的员工信息:" + employee);
        employeeDao.save(employee);

        //redirect: 重定向到一个地址  / 代表当前项目路径
        //forward: 转发到一个地址
        return "redirect:/emps";
    }

 

    (4)细节问题

      提交的数据格式不对:生日:日期;

      日期格式有很多种:如2017-12-12;2017/12/12;2017.12.12;

      默认日期是按照 / 的方式;

      日期的格式化;SpringMVC将页面提交的值需要转换为指定的类型;

      在 WebMvcAutoConfiguration 类中可以看到装配的日期格式化器:

      

 

       来到 WebMvcProperties 类中看到默认的日期格式:

      

      如果想要使用 - 的方式来使用日期,如 2017-12-12---Date; 类型转换,格式化;

      可以在配置文件中进行配置:

#配置springMVC的提交时的日期格式
spring.mvc.date-format=yyyy-MM-dd

  

  4、员工修改

    (1)复用添加页面

      页面请求:

<td>
    <a class="btn btn-sm btn-primary" th:href="@{/emp/}+${emp.id}">编辑</a>
    <a class="btn btn-sm btn-danger">删除</a>
</td>

 

      控制器方法:

    //跳转到修改页面,先查询当前员工,在页面回显
    @GetMapping(value = "/emp/{id}")
    public String toAddPage(@PathVariable(value = "id") Integer id, Model model) {
        Employee emp = employeeDao.get(id);
        model.addAttribute("emp", emp);

        Collection<Department> departments = departmentDao.getDepartments();
        model.addAttribute("depts", departments);

        //回到修改页面(修改添加二合一的页面)
        return "emp/add";
    }

 

    (2)页面显示

<main role="main" class="col-md-9 ml-sm-auto col-lg-10 pt-3 px-4">
    <!--需要区分是员工修改还是添加-->
    <form th:action="@{/emp}" method="post">
        <!--发送put请求修改员工数据-->
        <!--
            1、SpringMVC 中配置 HiddenHttpMethodFilter  SpringBoot 自动配置
            2、页面创建一个 post 表单
            3、创建一个隐藏域, name="_method" ,值就是指定的请求方式
        -->
        <input type="hidden" name="_method" value="PUT" th:if="${emp != null}">
        <input type="hidden" name="id" th:value="${emp != null} ? ${emp.id}">
        <div class="form-group">
            <label>LastName</label>
            <input type="text" class="form-control" placeholder="zhangsan" name="lastName" th:value="${emp != null} ? ${emp.lastName}">
        </div>
        <div class="form-group">
            <label>Email</label>
            <input type="email" class="form-control" placeholder="zhangsan@atguigu.com" name="email" th:value="${emp != null} ? ${emp.email}">
        </div>
        <div class="form-group">
            <label>Gender</label><br/>
            <div class="form-check form-check-inline">
                <input class="form-check-input" type="radio" name="gender"  value="1" th:checked="${emp != null} ? ${emp.gender} == 1">
                <label class="form-check-label"></label>
            </div>
            <div class="form-check form-check-inline">
                <input class="form-check-input" type="radio" name="gender"  value="0" th:checked="${emp != null} ? ${emp.gender} == 0">
                <label class="form-check-label"></label>
            </div>
        </div>
        <div class="form-group">
            <label>department</label>
            <select class="form-control" name="department.id">
                <option th:each="dept : ${depts}"
                        th:text="${dept.departmentName}"
                        th:value="${dept.id}"
                        th:selected="${emp != null} ? ${dept.id == emp.department.id}"></option>
            </select>
        </div>
        <div class="form-group">
            <label>Birth</label>
            <input type="text" class="form-control" placeholder="zhangsan" name="birth" th:value="${emp != null} ? ${#dates.format(emp.birth, 'yyyy-MM-dd')}">
        </div>
        <button type="submit" class="btn btn-primary" th:text="${emp!=null} ? '修改' : '添加'">添加</button>
    </form>
</main>

 

    (3)控制器方法

    //员工修改,根据员工id进行修改
    @PutMapping(value = "/emp")
    public String updateEmp(Employee employee) {
        System.out.println("修改的员工信息:" + employee);
        employeeDao.save(employee);

        return "redirect:/emps";
    }

 

  5、员工删除

    (1)页面请求

<td>
    <a class="btn btn-sm btn-primary" th:href="@{/emp/}+${emp.id}">编辑</a>
    <button class="btn btn-sm btn-danger delBtn" th:attr="del_uri=@{/emp/}+${emp.id}">删除</button>
</td>

<form action="" method="post" id="del_form">
    <input type="hidden" name="_method" value="delete">
</form>

<script>
    $(".delBtn").click(function () {
        if (confirm("确认删除吗?")) {
            $("#del_form").attr("action", $(this).attr('del_uri')).submit();
        }
        return false;
    });
</script>

 

    (2)控制器方法

    @DeleteMapping(value = "/emp/{id}")
    public String delEmp(@PathVariable(value = "id") Integer id) {
        System.out.println(id);
        employeeDao.delete(id);

        return "redirect:/emps";
    }

 

 

 

posted on 2021-11-29 09:24  格物致知_Tony  阅读(52)  评论(0编辑  收藏  举报