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Spring MVC框架：第六章：传统增删改查

传统CRUD

列表页面：
在这里插入图片描述
添加页面：

编辑页面：
在这里插入图片描述

删除操作：
在这里插入图片描述

导入SpringMVC jar包    
commons-logging-1.1.3.jar
spring-aop-4.0.0.RELEASE.jar
spring-beans-4.0.0.RELEASE.jar
spring-context-4.0.0.RELEASE.jar
spring-core-4.0.0.RELEASE.jar
spring-expression-4.0.0.RELEASE.jar
spring-web-4.0.0.RELEASE.jar
spring-webmvc-4.0.0.RELEASE.jar
taglibs-standard-impl-1.2.1.jar
taglibs-standard-spec-1.2.1.jar

创建SpringMVC配置文件：spring-mvc.xml
    配置自动扫描的包	
    <!-- 包扫描 -->
<context:component-scan base-package="com.*" />
    配置视图解析器
    <!-- 加前缀后缀 -->
<bean id="viewResolver"
	class="org.springframework.web.servlet.view.InternalResourceViewResolver">
	<property name="prefix" value="/WEB-INF/page/" />
	<property name="suffix" value=".jsp" />
</bean>
    配置静态资源访问（如果有）
    <!-- 保证常规资源可以访问 -->
<mvc:annotation-driven></mvc:annotation-driven>
<!-- 保证静态资源可以访问 -->
<mvc:default-servlet-handler />
    配置view-controller（如果有）这里我没有使用

配置web.xml
    DispatcherServlet
<!-- 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:spring-mvc.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>

创建实体类
    Employee
    Department

创建Dao
    DeptDao
    EmpDao

创建Service
    装配EmpDao
    装配DeptDao

创建Handler
    装配Service

创建index.jsp
    点一个超链接，到目标页面显示Employee的list

根据id删除Employee

创建Employee
    准备表单
    执行保存操作

更新Employee
    回显表单
    执行更新操作

1.实体类
Department 类

public class Department {

	private String deptId;
	private String deptName;
	public Department() {
		
	}
	public Department(String deptId, String deptName) {
		super();
		this.deptId = deptId;
		this.deptName = deptName;
	}
	public String getDeptId() {
		return deptId;
	}
	public void setDeptId(String deptId) {
		this.deptId = deptId;
	}
	public String getDeptName() {
		return deptName;
	}
	public void setDeptName(String deptName) {
		this.deptName = deptName;
	}
	@Override
	public String toString() {
		return "Department [deptId=" + deptId + ", deptName=" + deptName + "]";
	}	
}

Employee类：

public class Employee {

	private String empId;
	private String empName;
	private String ssn;
	private Department department;
	public Employee(String empId, String empName, String ssn, Department department) {
		super();
		this.empId = empId;
		this.empName = empName;
		this.ssn = ssn;
		this.department = department;
	}
	public Employee() {
	}
	public String getEmpId() {
		return empId;
	}
	public void setEmpId(String empId) {
		this.empId = empId;
	}
	public String getEmpName() {
		return empName;
	}
	public void setEmpName(String empName) {
		this.empName = empName;
	}
	public String getSsn() {
		return ssn;
	}
	public void setSsn(String ssn) {
		this.ssn = ssn;
	}
	public Department getDepartment() {
		return department;
	}
	public void setDepartment(Department department) {
		this.department = department;
	}
	@Override
	public String toString() {
		return "Employee [empId=" + empId + ", empName=" + empName + ", ssn=" + ssn + ", department=" + department
				+ "]";
	}
	
}

2.Dao
EmpDao：

package com.dao;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import org.springframework.stereotype.Repository;
import com.pojo.Department;
import com.pojo.Employee;
@Repository
public class EmpDao {
	private static Map<String, Employee> dataMap;
	static {
		dataMap = new HashMap<>();
		String empId = UUID.randomUUID().toString();
		dataMap.put(empId, new Employee(empId, "乔峰", "SSN001", DeptDao.getDeptByName("市场部")));
		
		empId = UUID.randomUUID().toString();
		dataMap.put(empId, new Employee(empId, "虚竹", "SSN002", DeptDao.getDeptByName("市场部")));
		
		empId = UUID.randomUUID().toString();
		dataMap.put(empId, new Employee(empId, "段誉", "SSN003", DeptDao.getDeptByName("市场部")));
		
		empId = UUID.randomUUID().toString();
		dataMap.put(empId, new Employee(empId, "鸠摩智", "SSN004", DeptDao.getDeptByName("技术部")));
		
		empId = UUID.randomUUID().toString();
		dataMap.put(empId, new Employee(empId, "萧远山", "SSN005", DeptDao.getDeptByName("技术部")));
		
		empId = UUID.randomUUID().toString();
		dataMap.put(empId, new Employee(empId, "慕容复", "SSN006", DeptDao.getDeptByName("技术部")));
		
		empId = UUID.randomUUID().toString();
		dataMap.put(empId, new Employee(empId, "段正淳", "SSN007", DeptDao.getDeptByName("公关部")));
		
		empId = UUID.randomUUID().toString();
		dataMap.put(empId, new Employee(empId, "段延庆", "SSN008", DeptDao.getDeptByName("公关部")));
		
		empId = UUID.randomUUID().toString();
		dataMap.put(empId, new Employee(empId, "丁春秋", "SSN009", DeptDao.getDeptByName("销售部")));
		
		empId = UUID.randomUUID().toString();
		dataMap.put(empId, new Employee(empId, "无崖子", "SSN010", DeptDao.getDeptByName("人事部")));
		
		empId = UUID.randomUUID().toString();
		dataMap.put(empId, new Employee(empId, "慕容博", "SSN011", DeptDao.getDeptByName("人事部")));
	}
	
	public void saveEmp(Employee employee) {
		
		String empId = UUID.randomUUID().toString();
		employee.setEmpId(empId);
		
		String deptId = employee.getDepartment().getDeptId();
		Department department = DeptDao.getDeptById(deptId);
		employee.setDepartment(department);
		
		dataMap.put(empId, employee);
	}
	
	public void removeEmp(String empId) {
		dataMap.remove(empId);
	}
	
	public void updateEmp(Employee employee) {
		
		String deptId = employee.getDepartment().getDeptId();
		Department department = DeptDao.getDeptById(deptId);
		employee.setDepartment(department);
		
		dataMap.put(employee.getEmpId(), employee);
	}
	
	public Employee getEmpById(String empId) {
		return dataMap.get(empId);
	}
	
	public List<Employee> getEmpList() {
		return new ArrayList<>(dataMap.values());
	}
}

DeptDao：

package com.dao;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import org.springframework.stereotype.Repository;
import com.pojo.Department;

@Repository
public class DeptDao {

	private static Map<String, Department> dataMap;
	private static Map<String, Department> namedMap;

	static {
		dataMap = new HashMap<>();
		namedMap = new HashMap<>();

		Department department = new Department(UUID.randomUUID().toString(), "市场部");
		dataMap.put(department.getDeptId(), department);
		namedMap.put(department.getDeptName(), department);

		department = new Department(UUID.randomUUID().toString(), "销售部");
		dataMap.put(department.getDeptId(), department);
		namedMap.put(department.getDeptName(), department);

		department = new Department(UUID.randomUUID().toString(), "行政部");
		dataMap.put(department.getDeptId(), department);
		namedMap.put(department.getDeptName(), department);

		department = new Department(UUID.randomUUID().toString(), "人事部");
		dataMap.put(department.getDeptId(), department);
		namedMap.put(department.getDeptName(), department);

		department = new Department(UUID.randomUUID().toString(), "技术部");
		dataMap.put(department.getDeptId(), department);
		namedMap.put(department.getDeptName(), department);

		department = new Department(UUID.randomUUID().toString(), "公关部");
		dataMap.put(department.getDeptId(), department);
		namedMap.put(department.getDeptName(), department);

	}

	public static Department getDeptByName(String deptName) {
		return namedMap.get(deptName);
	}

	public static Department getDeptById(String uuid) {
		return dataMap.get(uuid);
	}

	public List<Department> getDeptList() {
		return new ArrayList<>(dataMap.values());
	}
}

3.Services:

package com.services;

import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.dao.DeptDao;
import com.dao.EmpDao;
import com.pojo.Department;
import com.pojo.Employee;

@Service
public class Services {
	@Autowired
	private DeptDao deptDao;
	@Autowired
	private EmpDao empDao;
	
	public List<Department> deptDaoList(){
		return deptDao.getDeptList();
	};
	
	public List<Employee> empDaoList(){
		return empDao.getEmpList();
	}
	
	public void saveData(Employee employee) {
		empDao.saveEmp(employee);
	}
	
	public void delectData(String empId) {
		empDao.removeEmp(empId);
	}
	
	public Employee emdit(String empId) {
		Employee empById = empDao.getEmpById(empId);
		return empById;
	}
	
	public void updateEmp(Employee employee) {
		empDao.updateEmp(employee);
	}

}

4.handled:

package com.handled;

import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import com.pojo.Department;
import com.pojo.Employee;
import com.services.Services;

@Controller
public class Handled {

	@Autowired
	private Services services;
	
	@RequestMapping("/list")
	public String list(Model model) {
		List<Employee> empDaoList = services.empDaoList();
		model.addAttribute("list", empDaoList);
		return "dataList";
	}
	@RequestMapping("/addData")
	public String toAdd(Model model) {
		List<Department> deptDaoList = services.deptDaoList();
		model.addAttribute("deptList", deptDaoList);
		return "dataAdd";
	}
	@RequestMapping("/submitData")
	public String submit(Employee employee) {
		services.saveData(employee);
		return "redirect:/list";
	}
	@RequestMapping("/removeData")
	public String removeData(String empId) {
		services.delectData(empId);
		return "redirect:/list";
	}
	@RequestMapping("/emditData")
	public String emditData(String empId,Model model) {
		Employee emdit = services.emdit(empId);
		List<Department> deptDaoList = services.deptDaoList();
		model.addAttribute("emdit",emdit);
		model.addAttribute("deptList",deptDaoList);
		return "dataEdit";
	}
	
	@RequestMapping("/submitEmpData")
	public String submitEmp(Employee employee) {
		services.updateEmp(employee);
		return "redirect:/list";
	}
}

spring-mvc.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">
	<!-- 包扫描 -->
	<context:component-scan base-package="com.*" />
	<!-- 加前缀后缀 -->
	<bean id="viewResolver"
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/page/" />
		<property name="suffix" value=".jsp" />
	</bean>
	<!-- 保证常规资源可以访问 -->
	<mvc:annotation-driven></mvc:annotation-driven>
	<!-- 保证静态资源可以访问 -->
	<mvc:default-servlet-handler />
	
</beans>

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">

	<!-- 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:spring-mvc.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>

	<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>
</web-app>

index.jsp页面：

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!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="${pageContext.request.contextPath }/list">去列表</a>
</body>
</html>

dataList.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>Insert title here</title>
<script type="text/javascript" src="${pageContext.request.contextPath }/script/jquery-1.7.2.js"></script>
<script type="text/javascript">
	$(function(){
		$(".remove").click(function(){
			var data = $(this).parents("tr").children("td:eq(1)").text();
			var confirm = window.confirm("你确定要"+data+"删除吗？");
			if(!confirm){
				return false;
			}
		});
	});
</script>
</head>
<body>
	<center>
		<table>
			<c:if test="${empty requestScope.list }">
				<tr>
					<td>没有查询到数据</td>
				</tr>
			</c:if>
			<c:if test="${!empty requestScope.list }">
				<tr>
					<td>ID</td>
					<td>姓名</td>
					<td>SSN</td>
					<td>部门名称</td>
					<td colspan="2">操作</td>
				</tr>
				<c:forEach items="${requestScope.list }" var="list">
					<tr>
						<td>${list.empId}</td>
						<td>${list.empName}</td>
						<td>${list.ssn }</td>
						<td>${list.department.deptName }</td>
						<td><a href="${pageContext.request.contextPath }/removeData?empId=${list.empId }" class="remove">删除</a></td>
						<td><a href="${pageContext.request.contextPath }/emditData?empId=${list.empId}">编辑</a></td>
					</tr>
				</c:forEach>
			</c:if>
			<tr>
				<td colspan="6" align="center">
				<a href="${pageContext.request.contextPath }/addData">添加</a></td>
			</tr>
		</table>
	</center>
</body>
</html>

dataAdd.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>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/submitData" method="post">
		<table>
			<tr>
				<td>姓名</td>
				<td>
					<input type="text" name="empName"/>
				</td>
			</tr>
			<tr>
				<td>SSN</td>
				<td>
					<input type="text" name="ssn"/>
				</td>
			</tr>
			<tr>
				<td>所在部门</td>
				<td>
					<select name="department.deptId">
						<c:if test="${empty deptList }">
							<option>部门数据查询失败！！！</option>
						</c:if>
						<c:if test="${!empty deptList }">
							<c:forEach items="${requestScope.deptList}" var="dept">
								<option value="${dept.deptId }">${dept.deptName }</option>
							</c:forEach>
						</c:if>
					</select>
				</td>
			</tr>
			<tr>
				<td colspan="2">
					<input type="submit" value="保存"/>
				</td>
			</tr>
		</table>
	</form>
</body>
</html>

dataEdit.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>Insert title here</title>
</head>
<body>
	<form action="${pageContext.request.contextPath }/submitEmpData"
		method="post">
		<input type="hidden" name="empId" value="${requestScope.emdit.empId }"/>
		<table>
			<tr>
				<td>姓名</td>
				<td><input type="text" name="empName" value="${emdit.empName }" />
				</td>
			</tr>
			<tr>
				<td>SSN</td>
				<td><input type="text" name="ssn" value="${emdit.ssn }" /></td>
			</tr>
			<tr>
				<td>所在部门</td>
				<td><select name="department.deptId">
						<c:if test="${!empty deptList }">
							<c:forEach items="${requestScope.deptList}" var="dept">
								<c:if test="${dept.deptId==requestScope.emdit.department.deptId }">
									<option value="${dept.deptId }" selected="selected">${dept.deptName }</option>
								</c:if>
								<option value="${dept.deptId }" selected="selected">${dept.deptName }</option>
							</c:forEach>
						</c:if>
				</select></td>
			</tr>
			<tr>
				<td colspan="2"><input type="submit" value="保存" /></td>
			</tr>
		</table>
	</form>
</body>
</html>

在这里插入图片描述

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原文地址：https://www.cnblogs.com/javawxid/p/12812070.html

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