SpringMVC-RestfulCRUD || 员工信息表增删改查操作的具体实现

其他 2020-03-23 21:03:32 阅读次数: 0

SpringMVC-RestfulCRUD

利用SpringMVC做一个CRUD（增删改查）符合Rest风格的；

C：Create：创建

R：Retrieve：查询

U：Update：更新

D：Delete：删除

数据库：保存数据；

使用Map，List保存数据之类

员工列表展示；查询所有员工；

     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

     员工添加：

          在list页面点击“”员工添加“”----（查询出所有的部门信息要展示在页面）----来到添加页面（add.jsp）--------输入员工数据--------点击保存（/emp ）------处理器收到员工保存请求（保存员工）--------保存完成以后还是来到列表页面；

员工列表展示 

员工添加

原生的form表单

用了表单标签的页面可能会报这个错误；

请求域中没有一个command类型的对象；

来到页面之前一定要给请求域中放这个对象；

Department.java

package com.atguigu.bean;

public class Department {

	private Integer id;
	private String departmentName;

	public Department() {
	}
	
	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 + "]";
	}
	
}

Employee.java

package com.atguigu.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;
	}

	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() {
	}

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

DepartmentDao.java

package com.atguigu.dao;

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

import org.springframework.stereotype.Repository;

import com.atguigu.bean.Department;

/**
 * 操作部门的dao
 */
@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"));
	}
	
	/**
	 * 返回所有的部门
	 * @return
	 */
	public Collection<Department> getDepartments(){
		return departments.values();
	}
	
	/**
	 * 按照部门id查询部门
	 * @param id
	 * @return
	 */
	public Department getDepartment(Integer id){
		return departments.get(id);
	}
	
}

EmployeeDao.java

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


/**
 * EmployeeDao：操作员工
 */
@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", "[email protected]", 1, new Department(101, "D-AA")));
		employees.put(1002, new Employee(1002, "E-BB", "[email protected]", 1, new Department(102, "D-BB")));
		employees.put(1003, new Employee(1003, "E-CC", "[email protected]", 0, new Department(103, "D-CC")));
		employees.put(1004, new Employee(1004, "E-DD", "[email protected]", 0, new Department(104, "D-DD")));
		employees.put(1005, new Employee(1005, "E-EE", "[email protected]", 1, new Department(105, "D-EE")));
	}
	
	//初始id
	private static Integer initId = 1006;
	
	/**
	 * 员工保存/更新二合一方法；
	 * @param employee
	 */
	public void save(Employee employee){
		if(employee.getId() == null){
			employee.setId(initId++);
		}
		
		//根据部门id单独查出部门信息设置到员工对象中，页面提交的只需要提交部门的id
		employee.setDepartment(departmentDao.getDepartment(employee.getDepartment().getId()));
		employees.put(employee.getId(), employee);
	}
	
	/**
	 * 查询所有员工
	 * @return
	 */
	public Collection<Employee> getAll(){
		return employees.values();
	}
	
	/**
	 * 按照id查询某个员工
	 * @param id
	 * @return
	 */
	public Employee get(Integer id){
		return employees.get(id);
	}
	
	/**
	 * 删除某个员工
	 * @param id
	 */
	public void delete(Integer id){
		employees.remove(id);
	}
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--suppress ALL -->
<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>7.SpringMVC_crud</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <!-- 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>
	
	<!-- 字符编码Filter -->
	<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>
		<init-param>
			<param-name>forceEncoding</param-name>
			<param-value>true</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>CharacterEncodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	
	<!-- 支持Rest风格转换的filter -->
	<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>
</web-app>

springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--suppress ALL -->
<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"></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>

	<!-- 默认前端控制器是拦截所有资源（除过jsp），js文件就404了；要js文件的请求是交给tomcat处理的
	http://localhost:8080/7.SpringMVC_crud/scripts/jquery-1.9.1.min.js -->
	<!-- 告诉SpringMVC，自己映射的请求就自己处理，不能处理的请求直接交给tomcat -->
	<!-- 静态资源能访问，动态映射的请求就不行 -->
	<mvc:default-servlet-handler/>
	<!-- springmvc可以保证动态请求和静态请求都能访问 -->
	<mvc:annotation-driven></mvc:annotation-driven>

</beans>

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!-- 访问项目就要展示员工列表页面 -->
<jsp:forward page="/emps"></jsp:forward>

EmployeeController.java

package com.atguigu.controller;

import java.util.Collection;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
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.atguigu.bean.Department;
import com.atguigu.bean.Employee;
import com.atguigu.dao.DepartmentDao;
import com.atguigu.dao.EmployeeDao;

@Controller
public class EmployeeController {

	@Autowired
	EmployeeDao employeeDao;

	@Autowired
	DepartmentDao departmentDao;

	/**
	 * 查询所有员工
	 * 
	 * @return
	 */
	@RequestMapping("/emps")
	public String getEmps(Model model) {
		Collection<Employee> all = employeeDao.getAll();
		model.addAttribute("emps", all);
		return "list";
	}
	/**
	 * 删除员工
	 *
	 * @return
	 */
	@RequestMapping(value="/emp/{id}",method=RequestMethod.DELETE)
	public String deleteEmp(@PathVariable("id")Integer id){
		employeeDao.delete(id);
		return "redirect:/emps";
	}

	/**
	 * 查询员工，来到修改页面回显
	 * 
	 * @param id
	 * @param model
	 * @return
	 */
	@RequestMapping(value = "/emp/{id}", method = RequestMethod.GET)
	public String getEmp(@PathVariable("id") Integer id, Model model) {
		// 1、查出员工信息
		Employee employee = employeeDao.get(id);
		// 2、放在请求域中
		model.addAttribute("employee", employee);
		// 3、继续查出部门信息放在隐含模型中
		Collection<Department> departments = departmentDao.getDepartments();
		model.addAttribute("depts", departments);
		return "edit";
	}

	@RequestMapping(value = "/emp/{id}", method = RequestMethod.PUT)
	public String updateEmp(@ModelAttribute("employee")Employee employee/* ,@PathVariable("id")Integer id */) {
		System.out.println("要修改的员工：" + employee);
		// xxxx 更新保存二合一；
		employeeDao.save(employee);
		return "redirect:/emps";
	}

	@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);
		}
		System.out.println("hahha ");
	}

	/**
	 * 保存员工
	 * 
	 * @param employee
	 * @return
	 */
	@RequestMapping(value = "/emp", method = RequestMethod.POST)
	public String addEmp(Employee employee) {
		System.out.println("要添加的员工：" + employee);
		employeeDao.save(employee);
		// 返回列表页面；重定向到查询所有员工的请求
		return "redirect:/emps";
	}

	/**
	 * 去员工添加页面，去页面之前需要查出所有部门信息，进行展示的
	 * 
	 * @return
	 */
	@RequestMapping("/toaddpage")
	public String toAddPage(Model model) {
		// 1、先查出所有部门
		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

<%@ 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>

<%
		pageContext.setAttribute("ctp", request.getContextPath());
%>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>员工列表</title>

<script type="text/javascript" src="${ctp}/scripts/jquery-1.9.1.min.js"></script>

</head>
<body>
	
	<h1>员工列表</h1>
	<%-- cellpadding：单元格里面文字到单元格边框的距离
	  	 cellspacing：单元格之间的距离
	--%>
	<table border="1" cellpadding="5" cellspacing="0">
		<tr>
			<th>ID</th>
			<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><a href="${ctp}/emp/${emp.id}">edit</a></td>
				<td><a href="${ctp}/emp/${emp.id}" class="delBtn">delete</a></td>
			</tr>
		</c:forEach>

	</table>

	<a href="${ctp}/toaddpage">添加员工</a>
	
	<form id="deleteForm" action="" method="post">
		<input type="hidden" name="_method" value="DELETE" /> 
	</form>

	<script type="text/javascript">
		$(function(){
			$(".delBtn").click(function(){
				//0、确认删除？
				//1、改变表单的action指向
				$("#deleteForm").attr("action",this.href);
				//2、提交表单
				$("#deleteForm").submit();
				return false;
			});
		});
	</script>
</body>
</html>

add.jsp

<%@ 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>
<h1>员工添加</h1>

<%
	pageContext.setAttribute("ctp", request.getContextPath());
%>
<%--@elvariable id="employee" type=""--%>
<form:form action="${ctp}/emp" modelAttribute="employee" method="POST">

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

	<input type="submit" value="保存"/>

</form:form>

</body>
</html>

edit.jsp

<%@ 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>
<%
	pageContext.setAttribute("ctp", request.getContextPath());
%>
</head>
<body>
<h1>员工修改页面</h1>
<!-- modelAttribute：这个表单的所有内容显示绑定的是请求域中 employee的值-->
<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"/><br/>
	gender:&nbsp;&nbsp;&nbsp;
		男:<form:radiobutton path="gender" value="1"/>&nbsp;&nbsp;&nbsp;
		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>

</body>
</html>

小草dym
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