SpringMVC学习（五）-RESTFUl_CRUD操作

使用SpringMVC静态模仿从数据提取数据完成CRUD操作

重点知识详解：

1.将post请求改为DELETE和PUT请求（将GET请求，通过JQUERY完成转化为DELETE请求）

2.使用配置文件将get请求转换为post请求

3.静态资源问题的处理

1.Employee.java封装类

package com.springmvc.crud.entiry;public class Employee {    private Integer id;    private String lastname;    private String email;    //1 male 0 female    private Integer gender;    private Department department;    public Employee() {        super();        // TODO Auto-generated constructor stub    }    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getLastname() {        return lastname;    }    public void setLastname(String lastname) {        this.lastname = lastname;    }    public String getEmail() {        return email;    }    public void setEmail(String email) {        this.email = email;    }    public Integer getGender() {        return gender;    }    public void setGender(Integer gender) {        this.gender = gender;    }    public Department getDepartment() {        return department;    }    public void setDepartment(Department department) {        this.department = department;    }    public Employee(Integer id,String lastname, String email, Integer gender, Department department) {        super();        this.id=id;        this.lastname = lastname;        this.email = email;        this.gender = gender;        this.department = department;    }}

2.Department.java封装类

package com.springmvc.crud.entiry;public class Department {    private Integer id;    private String departmentName;    public Department() {        super();        // TODO Auto-generated constructor stub    }    public Department(Integer id, String departmentName) {        super();        this.id = id;        this.departmentName = departmentName;    }    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getDepartmentName() {        return departmentName;    }    public void setDepartmentName(String departmentName) {        this.departmentName = departmentName;    }}

3.EmployeeDao.java Dao层实现

package com.springmvc.crud.dao;import java.util.Collection;import java.util.HashMap;import java.util.Map;import org.springframework.stereotype.Repository;import com.springmvc.crud.entiry.Department;@Repositorypublic class DepartmentDao {    private static Map<Integer, Department> departments = null;    static{        departments = new HashMap<>();        departments.put(101, new Department(101,"D-AA"));        departments.put(102, new Department(102,"D-BB"));        departments.put(103, new Department(103,"D-CC"));        departments.put(104, new Department(104,"D-DD"));        departments.put(105, new Department(105,"D-EE"));    }    public Collection<Department> getDepartment() {        return departments.values();    }    public Department getDepartment(Integer id){        return departments.get(id);    }}

4.DepartmentDao.java Dao层实现

package com.springmvc.crud.dao;import java.util.Collection;import java.util.HashMap;import java.util.Map;import org.springframework.stereotype.Repository;import com.springmvc.crud.entiry.Department;@Repositorypublic class DepartmentDao {    private static Map<Integer, Department> departments = null;    static{        departments = new HashMap<>();        departments.put(101, new Department(101,"D-AA"));        departments.put(102, new Department(102,"D-BB"));        departments.put(103, new Department(103,"D-CC"));        departments.put(104, new Department(104,"D-DD"));        departments.put(105, new Department(105,"D-EE"));    }    public Collection<Department> getDepartment() {        return departments.values();    }    public Department getDepartment(Integer id){        return departments.get(id);    }}

5.EmployeeHandler.java实现类

package com.springmvc.crud.handler;import java.util.Map;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.ModelAttribute;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import com.springmvc.crud.dao.DepartmentDao;import com.springmvc.crud.dao.EmployeeDao;import com.springmvc.crud.entiry.Employee;@Controllerpublic class EmployeeHandler {    @Autowired    private EmployeeDao employeeDao;    @Autowired    private DepartmentDao departmentDao;    @RequestMapping("/emps")    public String list(Map<String,Object> map) {        map.put("employees",employeeDao.getAll());        return "list";    }    @RequestMapping(value="/emp",method=RequestMethod.GET)    public String inputAdd(Map<String,Object> map) {        map.put("departments", departmentDao.getDepartment());        map.put("employee", new Employee());        return "input";    }    @RequestMapping(value="/emp",method=RequestMethod.POST)    public String add(Employee employee) {        employeeDao.save(employee);        return "redirect:/emps";    }    @RequestMapping(value="/emp/{id}",method=RequestMethod.DELETE)      public String delete(@PathVariable("id")Integer id){          employeeDao.delete(id);           return "redirect:/emps";      }    @RequestMapping(value="/emp/{id}",method=RequestMethod.GET)    public String inputEdit(@PathVariable("id") Integer id,Map<String,Object> map) {        map.put("employee", employeeDao.get(id));        map.put("departments", departmentDao.getDepartment());        return "input";    }    @RequestMapping(value="/emp",method=RequestMethod.PUT)    public String update(Employee employee) {        employeeDao.save(employee);        return "redirect:/emps";    }    @ModelAttribute    public void getEmployee(@RequestParam(value="id",required=false) Integer id,Map<String,Object> map) {        if(id!=null) {            map.put("employee", employeeDao.get(id));        }    }}

6.web.xml配置

<?xml version="1.0" encoding="utf-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">    <!--          配置org.springframework.web.filter.HiddenHttpMethodFilter：        把POST请求转为DELETE或POST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>    <!-- 配置DispatcherServlet -->    <!-- 配置DispatcherServlet的作用是：如果在某个方法上配置了@RequestMapping("/helloworld")，         当浏览器访问helloworld时，DispatcherServlet会将这个请求发送给@RequestMapping("/helloworld")         所在的方法上，执行这个方法 -->    <servlet>        <servlet-name>SpringDispatcherServlet</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <!-- 配置DispatcherServlet的一个初始化参数：配置springMVC配置文件的位置和名称 -->        <init-param>            <param-name>contextConfigLocation</param-name>            <param-value>classpath:springmvc.xml</param-value>        </init-param>    <!--SpringDispatcherServlet在当前web应用被加载的时候被创建，而不是等第一次请求的时候被创建  -->        <load-on-startup>1</load-on-startup>    </servlet>    <servlet-mapping>        <servlet-name>SpringDispatcherServlet</servlet-name>        <url-pattern>/</url-pattern>  <!-- 可以应答所有请求 -->    </servlet-mapping></web-app>

7.springmvc.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xmlns:context="http://www.springframework.org/schema/context"    xmlns:mvc="http://www.springframework.org/schema/mvc"    xsi:schemaLocation="http://www.springframework.org/schema/beans                            http://www.springframework.org/schema/beans/spring-beans-3.2.xsd                           http://www.springframework.org/schema/context                            http://www.springframework.org/schema/context/spring-context-3.2.xsd                           http://www.springframework.org/schema/mvc                            http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">    <!-- 配置自动扫描的包 -->    <context:component-scan base-package="com.springmvc"></context:component-scan>    <!-- 配置视图 BeanNameViewResolver解析器：使用视图的名字来解析视图        order属性越低优先级越高    -->    <bean class="org.springframework.web.servlet.view.BeanNameViewResolver">          <property name="order" value="10" />      </bean>    <!-- 配置视图解析器：如何把handler方法返回值解析为实际视图 -->    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <property name="prefix" value="/WEB-INF/views/"/>        <property name="suffix" value=".jsp"/>    </bean>    <!-- 配置国际化资源文件 -->    <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">    <property name="basename" value="i18n"></property></bean><!--  --><mvc:default-servlet-handler/><mvc:annotation-driven></mvc:annotation-driven></beans>

8.index.jsp页面

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"    pageEncoding="ISO-8859-1"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body>    <a href="emps">listAllEmployees</a></body></html>

9.list.jsp页面

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"    pageEncoding="ISO-8859-1"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title><!-- SpringMVC处理静态--><script type="text/javascript" src="scripts/jquery-1.9.1.min.js"></script>      <script type="text/javascript">          $(function(){              $(".delete").click(function(){                  var href=$(this).attr("href");                  $("form").attr("action",href).submit();                  return false;              });          })        </script>  </head><body> <form action="" method="post">    <input type="hidden" name="_method" value="DELETE">    </form>    <h1>hello world</h1>    <c:if test="${empty requestScope.employees }">        <h1>no employee</h1>    </c:if>    <c:if test="${!empty requestScope.employees }">        <table border="1" cellpadding="10" cellspacing="0">            <tr>                <th>ID</th>                <th>LastName</th>                <th>Email</th>                <th>Gender</th>                <th>Department</th>                <th>Edit</th>                <th>Delete</th>            </tr>            <c:forEach items="${requestScope.employees }" var="emp">                <tr>                    <td>${emp.id }</td>                    <td>${emp.lastname }</td>                    <td>${emp.email }</td>                    <td>${emp.gender == 0 ? "Female" : "Male" }</td>                    <td>${emp.department.departmentName }</td>                    <td><a href="emp/${emp.id}">Edit</a></td>                    <td><a href="emp/${emp.id  }">Delete</a></td>                </tr>                            </c:forEach>        </table>    </c:if>    <br><br>    <a href="emp">Add New Employee</a></body></html>

10.input.jsp页面

<%@page import="java.util.HashMap"%><%@page import="java.util.Map"%><%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><form:form action="${pageContext.request.contextPath }/emp" method="POST"     modelAttribute="employee"/>    <!-- path 属性对应html表单标签的name属性 -->    <form:form action="springmvc/add" method="POST" modelAttribute="employee">      <c:if test="${employee.id==null }">          LastName:<form:input path="lastname"/> <br>      </c:if>      <c:if test="${employee.id!=null }">          <form:hidden path="id"/>          <%--对于_method不能使用form：hidden标签，因为modelAttribute对应的bean中没有_method这个属性 --%>        <input type="hidden" name="_method" value="PUT">      </c:if>     Email:<form:input path="email"></form:input><br>    <%        Map<String, String> genders = new HashMap<String, String>();        genders.put("1", "male");        genders.put("0", "female");        request.setAttribute("genders", genders);    %>    Gender:<form:radiobuttons path="gender" items="${genders }"/><br>    Department:<form:select path="department"         items="${departments }" itemLabel="departmentName" itemValue="id"></form:select><br>    <input type="submit" value="Submit"/> </form:form></body></html>