SpringMVC-RestfulCRUD
文章目录
-
- 回顾helloword基本配置
- 员工列表展示
- 添加
- 修改
- 删除
回顾helloword基本配置
web.xml
<servlet>
<servlet-name>SpringMVC_crudservlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
<load-on-startup>1load-on-startup>
servlet>
<servlet-mapping>
<servlet-name>SpringMVC_crudservlet-name>
<url-pattern>/url-pattern>
servlet-mapping>
<filter>
<filter-name>CharacterEncodingFilterfilter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
<init-param>
<param-name>encodingparam-name>
<param-value>UTF-8param-value>
init-param>
<init-param>
<param-name>forceEncodingparam-name>
<param-value>trueparam-value>
init-param>
filter>
<filter-mapping>
<filter-name>CharacterEncodingFilterfilter-name>
<url-pattern>/*url-pattern>
filter-mapping>
<filter>
<filter-name>HiddenHttpMethodFilterfilter-name>
<filter-class>org.springframework.web.filter.HiddenHttpMethodFilterfilter-class>
filter>
<filter-mapping>
<filter-name>HiddenHttpMethodFilterfilter-name>
<url-pattern>/*url-pattern>
filter-mapping>
xxxx-sevlet.xml
<context:component-scan base-package="com.jh">context:component-scan>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/">property>
<property name="suffix" value=".jsp">property>
bean>
@Controller
public class helloController {
@RequestMapping("/hello")
public String hello(){
return "success";
}
}
员工列表展示
访问index.jsp---->直接发送/emps---->控制器查询所有员工---->放在请求域中---->转发到list页面展示
@Controller
public class EmployeeController {
@Autowired
EmployeeDao employeeDao;
/*
* 查询所有员工
*/
@RequestMapping("/emps")
public String getEmps(Model model){
Collection<Employee> all = employeeDao.getAll();
model.addAttribute("emps", all);
return "list";
}
index.jsp
<!-- 访问项目就要展示员工列表页面 -->
<jsp:forward page="/emps"></jsp:forward>
list.jsp
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<title>员工列表</title>
</head>
<body>
<h1>员工列表页面</h1>
<table border="1" cellpadding="5px" cellspacing="0">
<tr>
<td>ID</td>
<th>lastName</th>
<th>email</th>
<th>gender</th>
<th>departmentName</th>
<th>edit</th>
<th>delete</th>
</tr>
<c:forEach items="${emps }" var="emp">
<tr>
<td>${emp.id }</td>
<td>${emp.lastName }</td>
<td>${emp.email }</td>
<td>${emp.gender==0?"女":"男" }</td>
<td>${emp.department.departmentName }</td>
<td>edit</td>
<td>delete</td>
</tr>
</c:forEach>
</table>
</body>
添加
1、list.jsp点击“员工添加”---->2、查询出所有的部门信息要展示在页面---->3、来到add.jsp---->4、输入员工数据---->5、点击保存---->6、处理器收到员工保存请求（保存员工）---->7、保存完成后来到list.jsp
/*
* 去员工添加页面，去之前查出所有部门信息进行展示
*/
@RequestMapping("/toaddpage")
public String toAddPage(Model model){
//1.查出所有部门
Collection<Department> departments = departmentDao.getDepartments();
//2.放在请求域中
model.addAttribute("depts", departments);
model.addAttribute("employee", new Employee());
//3.去添加页面
return "add";
}
list.jsp
<a href="toaddpage">添加员工</a>
add.jsp
<%@taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<h1>员工添加</h1>
<!-- 表单标签
通过springMVC的表单标签可以实现将模型数据中的属性和HTML表单元素绑定，
以实现表单数据更便捷编辑和表单值的回显
1）SpringMVC认为，表单数据中的每一项最终都是要回显的
path指定的是一个属性，这个属性是从隐含模型（请求域中取出的某个对象的属性）；
path指定的每一个属性，请求域中必须有一个对象，拥有这个属性；这个对象就是请求域中的command；
modelAttribute=""
1）、以前我们变淡标签会从请求域中获取一个command对象；把这个对象中的每一个属性对应的显示出来
2）、可以告诉springmvc不要去取command的值，我放了一个modelAttribute指定的值
去对象用的key就用我modelAttribute指定的
-->
<form:form action="" modelAttribute="employee">
lastName:<form:input path="lastName"/><br>
email:<form:input path="email"/><br>
gender:<br>
男：<form:radiobutton path="gender" value="1"/><br>
女：<form:radiobutton path="gender" value="0"/><br>
dept:
<!--
items="",指定要遍历的集合，自动遍历，遍历出的每一个元素都是一个department对象
itemLabel="属性"，指定遍历出的这个对象的哪个属性时作为option标签体的值
itemValue="属性名"，指定刚才遍历出来的这个对象的哪个属性时作为要提交的value值
-->
<form:select path="department.id" items="${depts }" itemLabel="departmentName" itemValue="id"></form:select><br>
<input type="submit" value="保存">
</form:form>
联系
5、点击保存
/*
* 保存员工
*/
@RequestMapping(value="/emp",method=RequestMethod.POST)
public String addEmp(Employee employee){
System.out.println("要添加的员工；"+employee);
employeeDao.save(employee);
return "redirect:/emps";
}
add.jsp
<!-- 绝对路径 -->
<%
pageContext.setAttribute("ctp", request.getContextPath());
%>
<form:form action="${ctp }/emp" modelAttribute="employee" method="POST">
联系：
运行结果
修改
/*
* 修改
*/
@RequestMapping(value="/emp/{id}",method=RequestMethod.PUT)
public String updateEmp(@ModelAttribute("employee")Employee employee){
System.out.println("要修改的员工"+employee);
//更新保存二合一
employeeDao.save(employee);
return "redirect:/emps";
}
/*
* 提前查询员工
*/
@ModelAttribute
public void myModelAttribute(@RequestParam(value="id",required=false)Integer id,Model model){
if(id!=null){
Employee employee = employeeDao.get(id);
model.addAttribute("employee", employee);
}
}
list.jsp
为edit加链接
<%
pageContext.setAttribute("ctp", request.getContextPath());
%>
<td>
<a href="${ctp }/emp/${emp.id }">edit</a>
</td>
<td>delete</td>
</tr>
</c:forEach>
</table>
<a href="${ctp }/toaddpage">添加员工</a>
edit.jsp
<%
pageContext.setAttribute("ctp", request.getContextPath());
%>
<h1>员工修改页面</h1>
<form:form action="${ctp }/emp/${employee.id }" modelAttribute="employee" method="post">
<input type="hidden" name="_method" value="put">
<input type="hidden" name="id" value="${employee.id }">
email:<form:input path="email"/>
gender:
男：<form:radiobutton path="gender" value="1"/>
女：<form:radiobutton path="gender" value="0"/><br>
dept:
<form:select path="department.id" items="${depts }"
itemLabel="departmentName" itemValue="id"></form:select>
<br>
<input type="submit" value="修改">
</form:form>
删除
/*
* 删除
*/
@RequestMapping(value="/emp/{id}",method=RequestMethod.DELETE)
public String deleteEmp(@PathVariable("id")Integer id){
employeeDao.delete(id);
return "redirect:/emps";
}
list.jsp
<td>
<form action="${ctp }/emp/${emp.id }" method="post">
<input type="hidden" name="_method" value="DELETE">
<input type="submit" value="删除">
</form>
</td>