SpringMVC_RESTRUL_CRUD

编写POJO

　　Departmet：

 package org.springmvc.curd.entity;

 public class Department {
 private int id;
 private String departmentName;
 public int getId() {
     return id;
 }
 public void setId(int id) {
     this.id = id;
 }
 public String getDepartmentName() {
     return departmentName;
 }
 public void setDepartmentName(String departmentName) {
     this.departmentName = departmentName;
 }
 @Override
 public String toString() {
     return "Department [id=" + id + ", departmentName=" + departmentName + "]";
 }
 public Department() {
 }
 public Department(int id, String departmentName) {
     super();
     this.id = id;
     this.departmentName = departmentName;
 }

 }

　　Employee：

 package org.springmvc.curd.entity;

 public class Employee {
 private Integer id;
 private String lastName;
 private String email;
 private Integer gender;
 private Department department = new Department();

 public Department getDepartment() {
     return department;
 }
 public void setDepartment(Department department) {
     this.department = department;
 }

 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;
 }
 @Override
 public String toString() {
     return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email + ", gender=" + gender + ", department="
             + department + "]";
 }

 public Employee(int id, String lastName, String email, int i, Department department) {
     super();
     this.id = id;
     this.lastName = lastName;
     this.email = email;
     this.gender = i;
     this.department = department;
 }
 public Employee() {
 }
 }

编写Dao：

　　DepartmentDao：

 package org.springmvc.crud.dao;

 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;

 import org.springframework.stereotype.Repository;
 import org.springmvc.curd.entity.Department;
 @Repository
 public class DepartmentDao {
 private static Map departments;
 static {
     departments = new HashMap<Integer,Department>();
     departments.put(101,new Department(101,"Depertment_101"));
     departments.put(102,new Department(102,"Depertment_102"));
     departments.put(103,new Department(103,"Depertment_103"));
     departments.put(104,new Department(104,"Depertment_104"));
     departments.put(105,new Department(105,"Depertment_105"));
 }
 public Collection<Department> getDepartments(){
     return departments.values();
 }
 public Department getDepartment(Integer id) {

     return (Department) departments.get(id);
 }
 }

　　EmployeeDao：

 package org.springmvc.crud.dao;

 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Repository;
 import org.springmvc.curd.entity.Department;
 import org.springmvc.curd.entity.Employee;

 import com.sun.org.apache.regexp.internal.recompile;
 import com.sun.org.apache.xml.internal.security.Init;
 @Repository
 public class EmployeeDao {
 private static Map<Integer, Employee> employees;
 private static Integer initId =1006;
 @Autowired
 private  DepartmentDao departmentDao;
 static {
     employees = new HashMap<>();
     employees.put(1001, new Employee(1001, "employee_1001","1001@163.com", 1,new Department()));
     employees.put(1002, new Employee(1002, "employee_1002","1001@163.com", 0,new Department()));
     employees.put(1003, new Employee(1003, "employee_1003","1001@163.com", 1,new Department()));
     employees.put(1004, new Employee(1004, "employee_1004","1001@163.com", 0,new Department()));
     employees.put(1005, new Employee(1005, "employee_1005","1001@163.com", 1,new Department()));
 }
 public void save(Employee employee){
     if (employee.getId()==null) {
         employee.setId(initId++);
     }
     employee.setDepartment(departmentDao.getDepartment(employee.getDepartment().getId()));
     employees.put(employee.getId(), employee);
 }
 public Collection<Employee> getAll(){
     return employees.values();
 }
 public  Employee get(Integer id) {
     return employees.get(id);
 }
 public void delete(Integer id) {
     employees.remove(id);
 }
 }
  

编写jsp：

　　index.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ 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=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <a href="emps" >list all emps</a>

</body>
</html>

　　list.jsp:

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
 <%@ 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=UTF-8">
 <title>Insert title here</title>
 <!--
     springmvc 处理静态资源
     dispatcherServlet  设置默认拦截了所有请求 包括页面中对图片 ，css，js文件等的加载
     而在dipatcherServlet中并没有配置有过相关映射处理
     1、配置<mvc:default-servlet-handler/> 处理被映射过的url
     2、配置<mvc:annotation-driven></mvc:annotation-driven>

  -->
 <script type="text/javascript" src="js/jquery-3.1.1.min.js"></script>
 <script type="text/javascript">
     /*    先将delete的url发送到form 在由form进行delete类型请求*/
     $(function(){
         $(".delete").click(function(){
             var href = $(this).attr("href");
             $("form").attr("action", href).submit();
             return false;
         });
     })
 </script>
 </head>
 <body>
     员工信息如下：
     <c:if test="${empty requestScope.employees}">
         没有任何员工信息
     </c:if>
     <c:if test="${!empty requestScope.employees}">

         <table border="1" cellpadding="10" cellspacing="0">
             <tr>
                 <th>ID</th>
                 <th>LastName</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.gender==0?'female':'male'}</td>
                     <td>${emp.department.departmentName}</td>
                     <td><a href="">Edit</a></td>
                     <td><a class="delete" href="emp/${emp.id}">Delete</a></td>

                 </tr>
             </c:forEach>
         </table>
             <br><br>
     <a href="addEmployee">addEmployee</a>
     <!-- 只能由post请求转化为Delete请求   而默认的超链接是get请求
         只能编写表单指定为post在进行转化
         表单要求： name="_method"    value="DELETE"
     -->
     <form action="" method="POST">
         <input type="hidden" name="_method" value="DELETE"/>
     </form>
     </c:if>
 </body>
 </html>

　　input.jsp:

 <%@page import="org.springmvc.curd.entity.Department"%>
 <%@page import="java.util.Map"%>
 <%@page import="java.util.HashMap"%>
 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
 <%@ 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>
 <!-- 使用form标签  更方便得进行表单值得回显-->
     <form:form action="save" method="POST" modelAttribute="employee">
         <!--path 属性对应 HTML 表单name  -->
         lastName:<form:input path="lastName"/>
         <br>
         email:<form:input path="email"/>
         <br>
         <%  Map<String, String> genders = new HashMap<String, String>();
             genders.put("0","female");
             genders.put("1","male");
             request.setAttribute("genders", genders);
         %>
         gender:<form:radiobuttons path="gender" items="${genders}" />

         <br>
          department:<form:select path="department.id"
                  items="${departments}"
                  itemLabel="departmentName"
                   itemValue="id" ></form:select> 

         <input type="submit" value="submit">
     </form:form>
 </body>
 </html>

编写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.xsd
         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
         http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
 <context:component-scan base-package="org.springmvc"></context:component-scan>
 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
     <property name="prefix" value="/WEB-INF/views/"></property>
     <property name="suffix" value=".jsp"></property>
 </bean>
     <mvc:default-servlet-handler/>
     <mvc:annotation-driven></mvc:annotation-driven>
 </beans>

编写Handler

 package org.springmvc.curd.handlers;

 import java.util.Map;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springmvc.crud.dao.DepartmentDao;
 import org.springmvc.crud.dao.EmployeeDao;
 import org.springmvc.curd.entity.Department;
 import org.springmvc.curd.entity.Employee;

 import com.fasterxml.jackson.annotation.JsonFormat.Value;
 import com.sun.org.apache.bcel.internal.generic.NEW;
 import com.sun.org.apache.regexp.internal.recompile;

 @Controller
 public 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="addEmployee",method=RequestMethod.GET)
 public String input(Map<String,Object> map) {
     map.put("departments",departmentDao.getDepartments());
     map.put("employee", new Employee());
     return "input";
 }
 //@PathVariable可用于获取随url发送过来的变量 匹配到参数
 @RequestMapping(value="save", method = RequestMethod.POST)
 public String save(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";
 }
 }