编写POJO
Departmet：
1 package org.springmvc.curd.entity;
2
3 public class Department {
4 private int id;
5 private String departmentName;
6 public int getId() {
7 return id;
8 }
9 public void setId(int id) {
10 this.id = id;
11 }
12 public String getDepartmentName() {
13 return departmentName;
14 }
15 public void setDepartmentName(String departmentName) {
16 this.departmentName = departmentName;
17 }
18 @Override
19 public String toString() {
20 return "Department [id=" + id + ", departmentName=" + departmentName + "]";
21 }
22 public Department() {
23 }
24 public Department(int id, String departmentName) {
25 super();
26 this.id = id;
27 this.departmentName = departmentName;
28 }
29
30 }
Employee：
1 package org.springmvc.curd.entity;
2
3
4 public class Employee {
5 private Integer id;
6 private String lastName;
7 private String email;
8 private Integer gender;
9 private Department department = new Department();
10
11 public Department getDepartment() {
12 return department;
13 }
14 public void setDepartment(Department department) {
15 this.department = department;
16 }
17
18 public Integer getId() {
19 return id;
20 }
21 public void setId(Integer id) {
22 this.id = id;
23 }
24 public String getLastName() {
25 return lastName;
26 }
27 public void setLastName(String lastName) {
28 this.lastName = lastName;
29 }
30 public String getEmail() {
31 return email;
32 }
33 public void setEmail(String email) {
34 this.email = email;
35 }
36
37
38 public Integer getGender() {
39 return gender;
40 }
41 public void setGender(Integer gender) {
42 this.gender = gender;
43 }
44 @Override
45 public String toString() {
46 return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email + ", gender=" + gender + ", department="
47 + department + "]";
48 }
49
50 public Employee(int id, String lastName, String email, int i, Department department) {
51 super();
52 this.id = id;
53 this.lastName = lastName;
54 this.email = email;
55 this.gender = i;
56 this.department = department;
57 }
58 public Employee() {
59 }
60 }
编写Dao：
DepartmentDao：
1 package org.springmvc.crud.dao;
2
3 import java.util.Collection;
4 import java.util.HashMap;
5 import java.util.Map;
6
7 import org.springframework.stereotype.Repository;
8 import org.springmvc.curd.entity.Department;
9 @Repository
10 public class DepartmentDao {
11 private static Map departments;
12 static {
13 departments = new HashMap<Integer,Department>();
14 departments.put(101,new Department(101,"Depertment_101"));
15 departments.put(102,new Department(102,"Depertment_102"));
16 departments.put(103,new Department(103,"Depertment_103"));
17 departments.put(104,new Department(104,"Depertment_104"));
18 departments.put(105,new Department(105,"Depertment_105"));
19 }
20 public Collection<Department> getDepartments(){
21 return departments.values();
22 }
23 public Department getDepartment(Integer id) {
24
25 return (Department) departments.get(id);
26 }
27 }
EmployeeDao：
1 package org.springmvc.crud.dao;
2
3 import java.util.Collection;
4 import java.util.HashMap;
5 import java.util.Map;
6
7 import org.springframework.beans.factory.annotation.Autowired;
8 import org.springframework.stereotype.Repository;
9 import org.springmvc.curd.entity.Department;
10 import org.springmvc.curd.entity.Employee;
11
12 import com.sun.org.apache.regexp.internal.recompile;
13 import com.sun.org.apache.xml.internal.security.Init;
14 @Repository
15 public class EmployeeDao {
16 private static Map<Integer, Employee> employees;
17 private static Integer initId =1006;
18 @Autowired
19 private DepartmentDao departmentDao;
20 static {
21 employees = new HashMap<>();
22 employees.put(1001, new Employee(1001, "employee_1001","1001@163.com", 1,new Department()));
23 employees.put(1002, new Employee(1002, "employee_1002","1001@163.com", 0,new Department()));
24 employees.put(1003, new Employee(1003, "employee_1003","1001@163.com", 1,new Department()));
25 employees.put(1004, new Employee(1004, "employee_1004","1001@163.com", 0,new Department()));
26 employees.put(1005, new Employee(1005, "employee_1005","1001@163.com", 1,new Department()));
27 }
28 public void save(Employee employee){
29 if (employee.getId()==null) {
30 employee.setId(initId++);
31 }
32 employee.setDepartment(departmentDao.getDepartment(employee.getDepartment().getId()));
33 employees.put(employee.getId(), employee);
34 }
35 public Collection<Employee> getAll(){
36 return employees.values();
37 }
38 public Employee get(Integer id) {
39 return employees.get(id);
40 }
41 public void delete(Integer id) {
42 employees.remove(id);
43 }
44 }
45
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:
1 <%@ page language="java" contentType="text/html; charset=UTF-8"
2 pageEncoding="UTF-8"%>
3 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
5 <html>
6 <head>
7 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
8 <title>Insert title here</title>
9 <!--
10 springmvc 处理静态资源
11 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
12 而在dipatcherServlet中并没有配置有过相关映射处理
13 1、配置<mvc:default-servlet-handler/> 处理被映射过的url
14 2、配置<mvc:annotation-driven></mvc:annotation-driven>
15
16 -->
17 <script type="text/javascript" src="js/jquery-3.1.1.min.js"></script>
18 <script type="text/javascript">
19 /* 先将delete的url发送到form 在由form进行delete类型请求*/
20 $(function(){
21 $(".delete").click(function(){
22 var href = $(this).attr("href");
23 $("form").attr("action", href).submit();
24 return false;
25 });
26 })
27 </script>
28 </head>
29 <body>
30 员工信息如下：
31 <c:if test="${empty requestScope.employees}">
32 没有任何员工信息
33 </c:if>
34 <c:if test="${!empty requestScope.employees}">
35
36 <table border="1" cellpadding="10" cellspacing="0">
37 <tr>
38 <th>ID</th>
39 <th>LastName</th>
40 <th>Gender</th>
41 <th>Department</th>
42 <th>Edit</th>
43 <th>Delete</th>
44 </tr>
45 <c:forEach items="${requestScope.employees}" var="emp" >
46 <tr>
47 <td>${emp.id}</td>
48 <td>${emp.lastName}</td>
49 <td>${emp.gender==0?‘female‘:‘male‘}</td>
50 <td>${emp.department.departmentName}</td>
51 <td><a href="">Edit</a></td>
52 <td><a class="delete" href="emp/${emp.id}">Delete</a></td>
53
54 </tr>
55 </c:forEach>
56 </table>
57 <br><br>
58 <a href="addEmployee">addEmployee</a>
59 <!-- 只能由post请求转化为Delete请求 而默认的超链接是get请求
60 只能编写表单指定为post在进行转化
61 表单要求： name="_method" value="DELETE"
62 -->
63 <form action="" method="POST">
64 <input type="hidden" name="_method" value="DELETE"/>
65 </form>
66 </c:if>
67 </body>
68 </html>
input.jsp:
1 <%@page import="org.springmvc.curd.entity.Department"%>
2 <%@page import="java.util.Map"%>
3 <%@page import="java.util.HashMap"%>
4 <%@ page language="java" contentType="text/html; charset=UTF-8"
5 pageEncoding="UTF-8"%>
6 <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
7 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
8 <html>
9 <head>
10 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
11 <title>Insert title here</title>
12 </head>
13 <body>
14 <!-- 使用form标签 更方便得进行表单值得回显-->
15 <form:form action="save" method="POST" modelAttribute="employee">
16 <!--path 属性对应 HTML 表单name -->
17 lastName:<form:input path="lastName"/>
18 <br>
19 email:<form:input path="email"/>
20 <br>
21 <% Map<String, String> genders = new HashMap<String, String>();
22 genders.put("0","female");
23 genders.put("1","male");
24 request.setAttribute("genders", genders);
25 %>
26 gender:<form:radiobuttons path="gender" items="${genders}" />
27
28 <br>
29 department:<form:select path="department.id"
30 items="${departments}"
31 itemLabel="departmentName"
32 itemValue="id" ></form:select>
33
34 <input type="submit" value="submit">
35 </form:form>
36 </body>
37 </html>
编写SpringMVC.xml
1 <?xml version="1.0" encoding="UTF-8"?>
2 <beans xmlns="http://www.springframework.org/schema/beans"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xmlns:context="http://www.springframework.org/schema/context"
5 xmlns:mvc="http://www.springframework.org/schema/mvc"
6 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
7 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
8 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
9 <context:component-scan base-package="org.springmvc"></context:component-scan>
10 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
11 <property name="prefix" value="/WEB-INF/views/"></property>
12 <property name="suffix" value=".jsp"></property>
13 </bean>
14 <mvc:default-servlet-handler/>
15 <mvc:annotation-driven></mvc:annotation-driven>
16 </beans>
编写Handler
1 package org.springmvc.curd.handlers;
2
3 import java.util.Map;
4
5 import org.springframework.beans.factory.annotation.Autowired;
6 import org.springframework.stereotype.Controller;
7 import org.springframework.web.bind.annotation.PathVariable;
8 import org.springframework.web.bind.annotation.RequestMapping;
9 import org.springframework.web.bind.annotation.RequestMethod;
10 import org.springmvc.crud.dao.DepartmentDao;
11 import org.springmvc.crud.dao.EmployeeDao;
12 import org.springmvc.curd.entity.Department;
13 import org.springmvc.curd.entity.Employee;
14
15 import com.fasterxml.jackson.annotation.JsonFormat.Value;
16 import com.sun.org.apache.bcel.internal.generic.NEW;
17 import com.sun.org.apache.regexp.internal.recompile;
18
19 @Controller
20 public class EmployeeHandler {
21 @Autowired
22 private EmployeeDao employeeDao;
23 @Autowired
24 private DepartmentDao departmentDao;
25
26 @RequestMapping("emps")
27 public String list(Map<String,Object>map) {
28 map.put("employees",employeeDao.getAll());
29 return "list";
30 }
31 @RequestMapping(value="addEmployee",method=RequestMethod.GET)
32 public String input(Map<String,Object> map) {
33 map.put("departments",departmentDao.getDepartments());
34 map.put("employee", new Employee());
35 return "input";
36 }
37 //@PathVariable可用于获取随url发送过来的变量 匹配到参数
38 @RequestMapping(value="save", method = RequestMethod.POST)
39 public String save(Employee employee) {
40 employeeDao.save(employee);
41 return "redirect:emps";
42 }
43 @RequestMapping(value="/emp/{id}",method=RequestMethod.DELETE)
44 public String delete(@PathVariable("id")Integer id) {
45 employeeDao.delete(id);
46 return "redirect:emps";
47 }
48 }
