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  • 第四章:(5)Web开发 之 Restful 实验

    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";
        }

     

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  • 原文地址:https://www.cnblogs.com/niujifei/p/15617946.html
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