springmvc运算-基础练手项目(5)-项目代码小结

一、项目代码概览

二、配置文件

1、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">
  <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>
  <servlet>
    <servlet-name>dispatcherServlet</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>
  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

2、转发配置器

在web.xml中已经取了名字叫: 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">

	<!-- 配置自动扫描的包 -->
	<context:component-scan base-package="com.test.springmvc"></context:component-scan>

	<!-- 配置视图解析器 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/views/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>

   <!--  
		default-servlet-handler 将在 SpringMVC 上下文中定义一个 DefaultServletHttpRequestHandler,
		它会对进入 DispatcherServlet 的请求进行筛查, 如果发现是没有经过映射的请求, 就将该请求交由 WEB 应用服务器默认的 
		Servlet 处理. 如果不是静态资源的请求,才由 DispatcherServlet 继续处理

		一般 WEB 应用服务器默认的 Servlet 的名称都是 default.
		若所使用的 WEB 服务器的默认 Servlet 名称不是 default,则需要通过 default-servlet-name 属性显式指定
		
	-->
	<mvc:default-servlet-handler/>
	<!-- 前面的 mvc:default-servlet-handler 可以解决静态资源了,但是让其他经过handler的请求,又失效了,所以配置了下面的 mvc:annotation-driven 来解决问题 -->
	<mvc:annotation-driven></mvc:annotation-driven>	
	

</beans>

三、处理逻辑

1、handler

EmployeeHandler.java

package com.test.springmvc.crud.handlers;

import java.util.Map;

import javax.validation.Valid;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.Errors;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.DeleteMapping;
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.test.springmvc.crud.dao.DepartmentDao;
import com.test.springmvc.crud.dao.EmployeeDao;
import com.test.springmvc.crud.entities.Employee;



@Controller
public class EmployeeHandler {

	@Autowired
	private EmployeeDao employeeDao;
	
	@Autowired
	private DepartmentDao departmentDao;
	
	//该控制器中,运行所有方法前的预处理
	//【这里主要是为了在修改修改雇员信息中,率先创建pojo并进行赋值,
	//避免表单因为缺少一些字段导致赋值给pojo的属性一些为空,当然pojo是同一个】
	@ModelAttribute
	public void getEmployee(@RequestParam(value="id",required=false) Integer id,
			Map<String, Object> map){
		if(id != null){
			map.put("employee", employeeDao.get(id));
		}
	}

	//利用pojo更新雇员信息
	@RequestMapping(value="/emp",method=RequestMethod.PUT)
	public String updateEmp(Employee employee){
		employeeDao.save(employee);
		return "redirect:/emps";
	}
	
	//跳转到更新雇员信息页面
	@RequestMapping(value="/emp/{id}",method=RequestMethod.GET)
	public String doUpdateEmp(@PathVariable("id") Integer id,Map<String, Object> map){
		map.put("employee", employeeDao.get(id));
		map.put("departments", departmentDao.getDepartments());
		return "updateEmp";
	}

	
	
	//在所有雇员信息页,进行删除雇员操作  //跳转部分不需要了,本身就是跳转到显示有雇员信息页
	@RequestMapping(value="/emp/{id}",method=RequestMethod.DELETE)
	public String deleteEmp(@PathVariable("id") Integer id){
        employeeDao.delete(id);	
        System.out.println("hello delete");
		return "redirect:/emps";
	}

	
	//跳转到添加雇员信息页面
    @RequestMapping("/doAddEmp")
	public String doAddEmp(Map<String, Object> map){
    	//为了提供在添加页面,部门列表
    	map.put("departments",departmentDao.getDepartments());
    	//为了提供雇员信息的回显值,添加一个空的雇员信息
    	map.put("employee", new Employee());
    	return "addEmp";
    }
	
    //处理添加雇员请求,并重定向到 	@RequestMapping("/emps")
    @RequestMapping(value="emp", method=RequestMethod.POST)
    public String addEmp(Employee employee) {
    	employeeDao.save(employee);
    	return "redirect:/emps";
		
	}
	
	//跳转到查看所有雇员信息页
    @RequestMapping("doGetEmps")
	public String doGetEmps(){
    	return "getEmps";
    }
    
	//查看所有雇员信息,采用默认的get方法,属于crud操作
	@RequestMapping("/emps")
	public String getEmps(Map<String, Object> map){
		map.put("employees", employeeDao.getAll());
		return "showGetEmps";
	}


	
}

2、bean

Employee.java

package com.test.springmvc.crud.entities;

import java.util.Date;

import javax.validation.constraints.Past;

import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.NotEmpty;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.format.annotation.NumberFormat;

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
	}
}

Department.java

package com.test.springmvc.crud.entities;

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
				+ "]";
	}
	
}

3、dao

EmployeeDao.java

package com.test.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 com.test.springmvc.crud.entities.Department;
import com.test.springmvc.crud.entities.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", "[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")));
	}
	
	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);
	}
}

DepartmentDao.java

package com.test.springmvc.crud.dao;

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

import org.springframework.stereotype.Repository;

import com.test.springmvc.crud.entities.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);
	}
	
}

四、jsp页面

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/fmt" %>

<!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="doGetEmps">转到请求所有雇员信息页</a>
<br>
<a href="doAddEmp">转到添加雇员信息页</a>

</body>
</html>

getEmps.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/fmt" %>

<!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">请求所有雇员信息(超链接属于get请求)</a>

</body>
</html>

showGetEmps.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>Get All</title>


<!--  
	SpringMVC 处理静态资源:
	1. 为什么会有这样的问题:
	优雅的 REST 风格的资源URL 不希望带 .html 或 .do 等后缀
	若将 DispatcherServlet 请求映射配置为 /, 
	则 Spring MVC 将捕获 WEB 容器的所有请求, 包括静态资源的请求, SpringMVC 会将他们当成一个普通请求处理, 
	因找不到对应处理器将导致错误。
	2. 解决: 在 SpringMVC 的配置文件中配置 <mvc:default-servlet-handler/>
-->
<script type="text/javascript" src="scripts/jquery-1.9.1.min.js"></script>
<script type="text/javascript">
	$(function(){
		alert("hello jquery");
		$(".delete").click(function(){
			var href = $(this).attr("href");
			$("form").attr("action", href).submit();			
			return false;
		});
	})
</script>


</head>
<body>

    <form action="" method="POST">
		<input type="hidden" name="_method" value="DELETE"/>
	</form>

	<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>Email</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.email}</td>	            
			<td>${emp.gender==0? "Female":"Male"}</td>					
			<td>${emp.department.departmentName}</td>			
			<td><a href="emp/${emp.id}">Edit</a></td>
			<td><a class="delete" href="emp/${emp.id}">Delete</a></td>			
			</tr>
			</c:forEach>
		</table>
	</c:if>


</body>
</html>

addEmp.jsp

<%@ page import="java.util.HashMap"%>
<%@ page import="java.util.Map"%>
<%@ 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>

	<!--  
		1. WHY 使用 form 标签呢 ?
		可以更快速的开发出表单页面, 而且可以更方便的进行表单值的回显
		2. 注意:
		可以通过 modelAttribute 属性指定绑定的模型属性,
		若没有指定该属性,则默认从 request 域对象中读取 command 的表单 bean
		如果该属性值也不存在,则会发生错误。
		
		大白话:form:form 表单标签,在springmvc中是一定要回显的,哪怕是第一次也要支持回显。
		所以第一次请求时,form:form 表单标签会从 request域中的 关键字中查找 默认值是command(如果 form:form标签 指定modelAttribute="XXX",则按照XXX关键字来)  查看属性值,用来填充表单值。
	
	-->
	
    <!-- 表单 路径也可以是  action="emp" -->
	<form:form action="${pageContext.request.contextPath }/emp" method="post" modelAttribute="employee">
		<!-- path标签对应 html表单标签的 name属性值,支持级联 如 path="department.id" -->
       LastName:<form:input path="lastName"  />
		<br>
       Email:<form:input path="email" />
		<%
			Map<String, String> genders = new HashMap();
				genders.put("1", "Male");
				genders.put("0", "Female");
				request.setAttribute("genders", genders);
		%>
		<br>
     Gender:<form:radiobuttons path="gender" items="${genders}" />
     <br>
     Department:<form:select path="department.id" items="${departments}" itemLabel="departmentName" itemValue="id"></form:select>
     <br>
		<input type="submit" value="submit" />
	</form:form>

</body>
</html>

updateEmp.jsp

<%@ page import="java.util.HashMap"%>
<%@ page import="java.util.Map"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ 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>

	<!--  
		1. WHY 使用 form 标签呢 ?
		可以更快速的开发出表单页面, 而且可以更方便的进行表单值的回显
		2. 注意:
		可以通过 modelAttribute 属性指定绑定的模型属性,
		若没有指定该属性,则默认从 request 域对象中读取 command 的表单 bean
		如果该属性值也不存在,则会发生错误。
		
		大白话:form:form 表单标签,在springmvc中是一定要回显的,哪怕是第一次也要支持回显。
		所以第一次请求时,form:form 表单标签会从 request域中的 关键字中查找 默认值是command(如果 form:form标签 指定modelAttribute="XXX",则按照XXX关键字来)  查看属性值,用来填充表单值。
	
	-->
    <!-- 表单 路径不可以是  action="emp" ,因为是 相对路径 只会在最后一个 目录 替换文件
    比如 http://localhost:8080/springmvc-2/emp/1003 提交后 变成 http://localhost:8080/springmvc-2/emp/emp  -->
	<form:form action="${pageContext.request.contextPath }/emp" method="post" modelAttribute="employee">
	<!-- pageContext.request.contextPath 如果项目放在根目录,就返回 -> ""  (空字符串)   如果不是就返回-> "/项目名" -->
       
       <c:if test="${employee.id == null }">
			<!-- 这个lastName的属性是不会出现的,
			这里用 if条件是因为 updateEmp.jsp 和 addEmp.jsp 本来混在一起用if 作为判断区分的 -->
			<!-- path标签对应 html表单标签的 name属性值,支持级联 如 path="department.id" -->		
			LastName: <form:input path="lastName"/>
		</c:if>
		<br>
       
       Email:<form:input path="email" />
       
		<form:hidden path="id"/>
		<input type="hidden" name="_method" value="PUT"/>
			<%-- 对于 _method 不能使用 form:hidden 标签, 因为 modelAttribute 对应的 bean 中没有 _method 这个属性 --%>
			<%-- <form:hidden path="_method" value="PUT"/> --%>
		
		<%
			Map<String, String> genders = new HashMap <String, String>() ;
				genders.put("1", "Male");
				genders.put("0", "Female");
				request.setAttribute("genders", genders);
		%>
		<br>
     Gender:<form:radiobuttons path="gender" items="${genders}" />
     <br>
     Department:<form:select path="department.id" items="${departments}" itemLabel="departmentName" itemValue="id"></form:select>
     <br>
		<input type="submit" value="submit" />
	</form:form>

</body>
</html>

 

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