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SpringMVC | REST CRUD

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REST CRUD案例

1.项目目录

2.导入上图中的所有jar包
3.配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>RestEmp</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
  <filter>
    <filter-name>CharacterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>CharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  
  <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>
  
  <!-- The front controller of this Spring Web application, responsible for handling all application requests -->
    <servlet>
        <servlet-name>springDispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springMVC.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!-- Map all requests to the DispatcherServlet for handling -->
    <servlet-mapping>
        <servlet-name>springDispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

4.配置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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        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">
    
    <context:component-scan base-package="com.atguigu.rest.crud"></context:component-scan>
    
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/view/"></property>
        <property name="suffix" value=".jsp"></property>
        <!-- <property name="order" value="1"></property> -->
    </bean>
    
    <!-- <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"></property>
        <property name="suffix" value=".jsp"></property>
        <property name="order" value="2"></property>
    </bean> -->
    
    <!-- 处理静态资源 -->
    <mvc:default-servlet-handler/>
    <mvc:annotation-driven></mvc:annotation-driven>
</beans>

5.准备项目所需要的bean、dao
5.1 Employee.java

package com.atguigu.rest.crud.bean;

public class Employee {

    private Integer id;
    private String lastName;

    private String email;
    //1 male, 0 female
    private Integer gender;
    
    private 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;
    }

    public Department getDepartment() {
        return department;
    }

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

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

    public Employee() {
        // TODO Auto-generated constructor stub
    }
}

5.2 Department.java

package com.atguigu.rest.crud.bean;

public class Department {

    private Integer id;
    private String departmentName;

    public Department() {
        // TODO Auto-generated constructor stub
    }
    
    public Department(int i, String string) {
        this.id = i;
        this.departmentName = string;
    }

    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;
    }

    @Override
    public String toString() {
        return "Department [id=" + id + ", departmentName=" + departmentName
                + "]";
    }
    
}

5.3 EmployeeDao.java

package com.atguigu.rest.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 com.atguigu.rest.crud.bean.Department;
import com.atguigu.rest.crud.bean.Employee;

@Repository
public class EmployeeDao {

    private static Map<Integer, Employee> employees = null;
    
    @Autowired
    private DepartmentDao departmentDao;
    
    static{
        employees = new HashMap<Integer, Employee>();

        employees.put(1001, new Employee(1001, "E-AA", "aa@163.com", 1, new Department(101, "D-AA")));
        employees.put(1002, new Employee(1002, "E-BB", "bb@163.com", 1, new Department(102, "D-BB")));
        employees.put(1003, new Employee(1003, "E-CC", "cc@163.com", 0, new Department(103, "D-CC")));
        employees.put(1004, new Employee(1004, "E-DD", "dd@163.com", 0, new Department(104, "D-DD")));
        employees.put(1005, new Employee(1005, "E-EE", "ee@163.com", 1, new Department(105, "D-EE")));
    }
    
    private static Integer initId = 1006;
    
    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);
    }
}

5.4 DepartmentDao.java

package com.atguigu.rest.crud.dao;

import java.util.Collection;

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

import org.springframework.stereotype.Repository;

import com.atguigu.rest.crud.bean.Department;


@Repository
public class DepartmentDao {

    private static Map<Integer, Department> departments = null;
    
    static{
        departments = new HashMap<Integer, Department>();
        
        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> getDepartments(){
        return departments.values();
    }
    
    public Department getDepartment(Integer id){
        return departments.get(id);
    }
    
}

6.准备项目需要的所有页面
6.1 list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!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>展示员工信息</title>
<%-- <link rel="stylesheet" href="${pageContext.servletContext.contextPath}/css/index_like.css"> --%>
<link rel="stylesheet" href="${pageContext.servletContext.contextPath}/css/index_work.css">
<script type="text/javascript" src="${pageContext.servletContext.contextPath}/js/jquery-1.8.2.min.js"></script>
<script type="text/javascript">
    $(function(){
        $(".del").click(function(){
            //submit()将所获得的form元素提交
            if(confirm("确认删除吗？")){
                $("form").attr("action", this.href).submit();//$(this).attr("href")
                return false;//将超链接的默认行为取消
            }
            return false;//将超链接的默认行为取消
        });
    });//预加载函数或文档就绪函数
</script>
</head>
<body>
    <table>
        <tr>
            <th>ID</th>
            <th>LASTNAME</th>
            <th>EMAIL</th>
            <th>GENDER</th>
            <th>DEPARTMENTNAME</th>
            <th>OPTION(<a href="emp">ADD</a>)</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>
                    <a href="emp/${emp.id}">UPDATE</a>
                    <a class="del" href="emp/${emp.id}">DELETE</a>
                </td>
            </tr>
        </c:forEach>
    </table>
    
    <form method="post">
        <input type="hidden" name="_method" value="DELETE">
    </form>
</body>
</html>

6.2 add.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!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>添加员工信息</title>
<link rel="stylesheet" href="${pageContext.servletContext.contextPath}/css/index_work.css">
</head>
<body>
    <form action="emp" method="post">
        <table>
        <tr>
            <th colspan="2">添加员工信息</th>
        </tr>
        <tr>
            <td>LASTNAME</td>
            <td>
                <input type="text" name="lastName">
            </td>
        </tr>
        <tr>
            <td>EMAIL</td>
            <td>
                <input type="text" name="email">
            </td>
        </tr>
        <tr>
            <td>GENDER</td>
            <td>
                <input type="radio" name="gender" value="1">男
                <input type="radio" name="gender" value="0">女
            </td>
        </tr>
        <tr>
            <td>DEPARTMENT</td>
            <td>
                <select name="department.id">
                    <option>-SELECT DEPARTMENT-</option>
                    <c:forEach items="${depts}" var="dept">
                        <option value="${dept.id}">${dept.departmentName}</option>
                    </c:forEach>
                    
                </select>
            </td>
        </tr>
        <tr>
            <td colspan="2">
                <input type="submit" name="ADD">
            </td>
        </tr>
    </table>
    </form>
</body>
</html>

6.3 update.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!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>修改员工信息</title>
<link rel="stylesheet" href="${pageContext.servletContext.contextPath}/css/index_work.css">
</head>
<body>
    <form action="${pageContext.servletContext.contextPath}/emp" method="post">
        <input type="hidden" name="_method" value="PUT">
        <input type="hidden" name="id" value="${emp.id}">
        <table>
        <tr>
            <th colspan="2">修改员工信息</th>
        </tr>
        <tr>
            <td>LASTNAME</td>
            <td>
                <input type="text" name="lastName" value="${emp.lastName}">
            </td>
        </tr>
        <tr>
            <td>EMAIL</td>
            <td>
                <input type="text" name="email" value="${emp.email}">
            </td>
        </tr>
        <tr>
            <td>GENDER</td>
            <td>
                <%-- <input type="radio" name="gender" value="1" <c:if test="${emp.gender==1}"> checked="checked"</c:if>>男
                <input type="radio" name="gender" value="0" <c:if test="${emp.gender==0}"> checked="checked"</c:if>>女 --%>
                <input type="radio" name="gender" value="1" ${emp.gender==1?'checked':''}>男
                <input type="radio" name="gender" value="0" ${emp.gender==0?'checked':''}>女
            </td>
        </tr>
        <tr>
            <td>DEPARTMENT</td>
            <td>
                <select name="department.id">
                    <option>-SELECT DEPARTMENT-</option>
                    <c:forEach items="${depts}" var="dept">
                        <option value="${dept.id}" ${dept.id==emp.department.id?'selected':''}>${dept.departmentName}</option>
                    </c:forEach>
                </select>
            </td>
        </tr>
        <tr>
            <td colspan="2">
                <input type="submit" name="UPDATE">
            </td>
        </tr>
    </table>
    </form>
</body>
</html>

6.4 edit.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="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>编辑员工信息</title>
<link rel="stylesheet" href="${pageContext.servletContext.contextPath }/css/index_work.css" />
</head>
<body>
    <!-- 使用SpringMVC from标签重构添加/修改页面 -->
    <!-- modelAttribute自定义回显对象的属性名 -->
    <form:form action="${pageContext.servletContext.contextPath }/emp" method="post" modelAttribute="emp">
        
        <c:if test="${empty emp.id}" var="flag"></c:if>
        <c:if test="${!flag}">
            <form:hidden path="id"/>
            <input type="hidden" name="_method" value="PUT" />
        </c:if>
        
        <table>
            <tr>
                <th colspan="2">
                    <c:if test="${flag }">添加员工信息</c:if>
                    <c:if test="${!flag }">修改员工信息</c:if>
                </th>
            </tr>
            <tr>
                <td>LASTNAME</td>
                <td>
                    <form:input path="lastName"/>
                </td>
            </tr>
            <tr>
                <td>EMAIL</td>
                <td>
                    <form:input path="email"/>
                </td>
            </tr>
            <tr>
                <td>GENDER</td>
                <td>
                    <form:radiobuttons path="gender" items="${genders}"/>
                </td>
            </tr>
            <tr>
                <td>DEPARTMENT</td>
                <td>
                    <form:select path="department.id" items="${depts}" itemLabel="departmentName" itemValue="id"></form:select>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <c:if test="${flag}">
                        <input type="submit" value="ADD" />
                    </c:if>
                    <c:if test="${!flag}">
                        <input type="submit" value="UPDATE" />
                    </c:if>
                </td>
            </tr>
        </table>
    </form:form>

</body>
</html>

7.EmpController_Old.java(实现添加修改的第一种方式，选择第二种方式时注释掉EmpController_Old类的@Controller注解)

package com.atguigu.rest.crud.controller;

import java.util.Collection;
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 com.atguigu.rest.crud.bean.Department;
import com.atguigu.rest.crud.bean.Employee;
import com.atguigu.rest.crud.dao.DepartmentDao;
import com.atguigu.rest.crud.dao.EmployeeDao;

//@Controller
public class EmpController_Old {
    //添加修改的第一种方式
    @Autowired
    private EmployeeDao employeeDao;
    
    @Autowired
    private DepartmentDao departmentDao;
    
    /**
     * 获取所有的员工信息
     */
    @RequestMapping(value="/emps")
    public String getAll(Map<String, Object> map){
        Collection<Employee> emps = employeeDao.getAll();
        map.put("emps", emps);
        return "list";
    }
    
    /**
     * 跳转到添加页面
     */
    @RequestMapping(value="/emp", method=RequestMethod.GET)
    public String toAdd(Map<String, Object> map){
        Collection<Department> depts = departmentDao.getDepartments();
        map.put("depts", depts);
        return "add";
    }
    
    /**
     * 添加员工信息
     */
    @RequestMapping(value="/emp", method=RequestMethod.POST)
    public String addEmp(Employee employee){
        employeeDao.save(employee);
        return "redirect:/emps";
    }
    
    /**
     * 获取要回显的数据，跳转到修改页面，并回显
     */
    @RequestMapping(value="/emp/{id}", method=RequestMethod.GET)
    public String toUpdate(@PathVariable("id")Integer id, Map<String, Object> map){
        //获取要修改的员工信息
        Employee emp = employeeDao.get(id);
        //所有的部门信息，供用户选择
        Collection<Department> depts = departmentDao.getDepartments();
        map.put("emp", emp);
        map.put("depts", depts);
        return "update";
    }
    
    @RequestMapping(value="/emp", method=RequestMethod.PUT)
    public String updateEmp(Employee employee){
        employeeDao.save(employee);//修改
        return "redirect:/emps";
    }
}

8.EmpController.java(实现添加修改的第二种方式，选择第一种方式时注释掉EmpController类的@Controller注解)

package com.atguigu.rest.crud.controller;

import java.util.Collection;

import java.util.HashMap;
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 com.atguigu.rest.crud.bean.Department;
import com.atguigu.rest.crud.bean.Employee;
import com.atguigu.rest.crud.dao.DepartmentDao;
import com.atguigu.rest.crud.dao.EmployeeDao;

@Controller
public class EmpController {
    //添加修改的第二种方式

    @Autowired
    private EmployeeDao employeeDao;
    
    @Autowired
    private DepartmentDao departmentDao;
    
    /**
     * 获取所有的员工信息
     * @param map
     * @return
     */
    @RequestMapping(value="/emps")
    public String getAll(Map<String, Object> map) {
        Collection<Employee> emps = employeeDao.getAll();
        map.put("emps", emps);
        return "list";
    }
    
    /**
     * 跳转到添加页面
     * @return
     */
    @RequestMapping(value="/emp", method=RequestMethod.GET)
    public String toAdd(Map<String, Object> map) {
        //获取所有的部门信息
        Collection<Department> depts = departmentDao.getDepartments();
        //创建存储性别gender的信息
        Map<String, String> genders = new HashMap<>();
        genders.put("0", "女");
        genders.put("1", "男");
        map.put("depts", depts);
        map.put("genders", genders);
        //form标签有自动回显的功能，会在页面中能够默认获取request作用于中command属性的值
        //map.put("command", new Employee());
        //若在<form:form>设置了modelAttribute，就可以自定义回显对象的属性名
        map.put("emp", new Employee());
        return "edit";
    }
    
    /**
     * 添加员工信息
     * @param employee
     * @return
     */
    @RequestMapping(value="/emp", method=RequestMethod.POST)
    public String addEmp(Employee employee) {
        employeeDao.save(employee);
        return "redirect:/emps";
    }
    
    /**
     * 获取要回显的数据，跳转到修改页面，并回显
     * @param id
     * @param map
     * @return
     */
    @RequestMapping(value="/emp/{id}", method=RequestMethod.GET)
    public String toUpdate(@PathVariable("id") Integer id, Map<String, Object> map) {
        //获取要修改的员工信息
        Employee emp = employeeDao.get(id);
        //所有的部门信息，供用户选择
        Collection<Department> depts = departmentDao.getDepartments();
        //设置存储性别的map集合
        Map<String, String> genders = new HashMap<>();
        genders.put("0", "女");
        genders.put("1", "男");
        map.put("emp", emp);
        map.put("depts", depts);
        map.put("genders", genders);
        return "edit";
    }
    
    /**
     * 修改员工信息
     */
    @RequestMapping(value="/emp", method=RequestMethod.PUT)
    public String updateEmp(Employee employee) {
        employeeDao.save(employee);//修改
        return "redirect:/emps";
    }
    
    @RequestMapping(value="/emp/{id}", method=RequestMethod.DELETE)
    public String deleteEmp(@PathVariable("id")Integer id){
        employeeDao.delete(id);
        return "redirect:/emps";
    }
}