@RequestMapping(value="/student",method=RequestMethod.GET)
 public ModelAndView toAddPage(){
  ModelAndView mView=new ModelAndView();
  mView.addObject("employee",new Employee());
  mView.setViewName("add-stu");
  mView.addObject("departments", departmentDao.getDepartments());
  return mView;
 }

@RequestMapping(value="/student",method=RequestMethod.POST)
 public String addStu(Employee employee){
  employeeDao.save(employee);
  return "redirect:/show" ;
 }

@RequestMapping(value="/student/{id}",method=RequestMethod.DELETE)
 public String deleteStu(@PathVariable(value="id") Integer id){
  employeeDao.delete(id);
  return "redirect:/show" ;
 }

@RequestMapping(value="/student",method=RequestMethod.PUT)
 public String Update(@RequestParam(value="id")Integer id,Employee employee){
  employeeDao.save(employee);
  return "redirect:/show" ;
 }

<!-- HiddenHttpMethodFilter过滤器可以将POST请求转化为put请求和delete请求! -->
　　 <filter>
 　　 <filter-name>hiddenHttpMethodFilter</filter-name>
 　　 <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
 　　 </filter>
 　　 <filter-mapping>
 　　 <filter-name>hiddenHttpMethodFilter</filter-name>
 　　 <url-pattern>/*</url-pattern>
 　　</filter-mapping>

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

<form:form action="${pageContext.request.contextPath}/student" method="post" modelAttribute="employee">
  <c:if test="${empty employee.id }">
   姓名：<form:input path="lastName"/><br>
  </c:if>
  <c:if test="${!empty employee.id }">
   姓名：<form:input path="lastName" readonly="true"/><br>
    <form:hidden path="id"/>
    <input type="hidden" name="_method" value="put">
  </c:if>
  邮箱：<form:input path="email"/><br>
  <%
   Map<String,Object>map=new HashMap<String,Object>();
   map.put("1","Male");
   map.put("0", "Female");
   request.setAttribute("genders", map);
  %>
  性别：<form:radiobuttons path="gender" items="${genders}"/><br>
  部门：<form:select path="department.id" items="${departments}" itemValue="id" itemLabel="departmentName"></form:select><br>
  <input type="submit" value="提交">
 </form:form>