一、 添加所有员工信息
- 显示添加页面
- URL：emp
- 请求方式：GET
- jsp页面
- 添加请求方式：POST
- 显示效果：完成添加，重定向到 list 页
二、展示所有员工信息
- URI：emps
- 请求方式：GET
- 显示效果
三、删除单个员工信息
URL：emp/{id}
- 请求方式：DELETE
- 删除后效果：对应记录从数据表中删除
四、更改单个员工信息
- 显示修改页面：
• URI：emp/{id}
• 请求方式：GET
• 显示效果：回显表单。 - 修改员工信息：
• URI：emp
• 请求方式：PUT
• 显示效果：完成修改，重定向到 list 页面。
为了方便数据的操作管理定义了两个类存储数据
- （Employee类和Department类）
具体介绍：
- 实体类：
- Employee、Department
- EmployeeHandler
- EmployeeDao、DepartmentDao
- 相关的页面
- list.jsp
- input.jsp
- edit.jsp
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;
@NotEmpty
private String lastName;
@Email
private String email;
//1 male, 0 female
private Integer gender;
private Department department;
@Past
@DateTimeFormat(pattern="yyyy-MM-dd")
private Date birth;
@NumberFormat(pattern="#,###,###.#")
private Float salary;
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 Date getBirth() {
return birth;
}
public void setBirth(Date birth) {
this.birth = birth;
}
public Float getSalary() {
return salary;
}
public void setSalary(Float salary) {
this.salary = salary;
}
@Override
public String toString() {
return "Employee [id=" + id + ", lastName=" + lastName + ", email="
+ email + ", gender=" + gender + ", department=" + department
+ ", birth=" + birth + ", salary=" + salary + "]";
}
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
}
}
package com.atguigu.springmvc.crud.entities;
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
+ "]";
}
}
其中DepartmentDao类和Employee类又初始化时自定义了五条初始数据
EmployeeDao 类
package com.atguigu.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.atguigu.springmvc.crud.entities.Department;
import com.atguigu.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(1, new Employee(1, "ZAS", "[email protected]", 1, new Department(101, "JAVA")));
employees.put(2, new Employee(2, "ZDS", "[email protected]", 0, new Department(102, "C++")));
employees.put(3, new Employee(3, "LSD", "[email protected]", 0, new Department(103, "C#")));
employees.put(4, new Employee(4, "FSD", "[email protected]", 0, new Department(104, "Python")));
employees.put(5, new Employee(5, "ERF", "[email protected]", 1, new Department(105, "Pycharm")));
}
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);
}
}
EmployeeDao类
package com.atguigu.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.atguigu.springmvc.crud.entities.Department;
import com.atguigu.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(1, new Employee(1, "ZAS", "[email protected]", 1, new Department(101, "JAVA")));
employees.put(2, new Employee(2, "ZDS", "[email protected]", 0, new Department(102, "C++")));
employees.put(3, new Employee(3, "LSD", "[email protected]", 0, new Department(103, "C#")));
employees.put(4, new Employee(4, "FSD", "[email protected]", 0, new Department(104, "Python")));
employees.put(5, new Employee(5, "ERF", "[email protected]", 1, new Department(105, "Pycharm")));
}
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);
}
}
index.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<script type="text/javascript" src="scripts/jquery-1.9.1.min.js"></script>
<script type="text/javascript">
$(function(){
$("#testJson").click(function(){
var url = this.href;
var args = {
};
$.post(url, args, function(data){
alert(1);
for(var i = 0; i < data.length; i++){
var id = data[i].id;
var lastName = data[i].lastName;
alert(id + ": " + lastName);
}
});
return false;
});
})
</script>
<a href="testJson" id="testJson">Test Json</a>
<br><br>
<a href="emps">List All Employees</a>
<br>
<br>
input.jsp输入页面展示
<%@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>
<br>
<br>
<!-- el表达式
${pageContext.request.contextPath }获取 localhost:8080/
获取绝对路径
-->
<form:form action="${pageContext.request.contextPath }/emp"
method="POST" modelAttribute="employee">
<form:errors path="*"></form:errors>
<br>
<c:if test="${employee.id == null }">
<!-- path 属性对应 html 表单标签的 name 属性值 -->
LastName: <form:input path="lastName" />
<form:errors path="lastName"></form:errors>
</c:if>
<c:if test="${employee.id != null }">
<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"/>
--%>
</c:if>
<br>
Email: <form:input path="email" />
<form:errors path="email"></form:errors>
<br>
<%
Map<String, String> genders = new HashMap();
genders.put("1", "Male");
genders.put("0", "Female");
request.setAttribute("genders", genders);
%>
Gender:
<br>
<form:radiobuttons path="gender" items="${genders }" delimiter="<br>" />
<br>
Department: <form:select path="department.id" items="${departments }"
itemLabel="departmentName" itemValue="id"></form:select>
<br>
<input type="submit" value="Submit" />
</form:form>
</body>
</html>
使用SpringMVC多个表单组件标签目的
- form 标签
一般情况下，通过 GET 请求获取表单页面，而通过POST 请求提交表单页面，因此获取表单页面和提交表单 页面的 URL
是相同的。只要满足该最佳条件的契约，<form:form > 标签就无需通过 action 属性指定表单提交的 URL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
- 表单标签
SpringMVC 提供了多个表单组件标签，如 < form:input/>、
< form:select/>
等，用以绑定表单字段的属性值，它们的共有属性如下：
– path：表单字段，对应 html 元素的 name 属性，支持级联属性
–htmlEscape：是否对表单值的 HTML 特殊字符进行转换，默认值 为 true
– cssClass：表单组件对应的 CSS
样式类名
– cssErrorClass：表单组件的数据存在错误时，采取的 CSS 样式form:input、form:password、form:hidden、form:textarea ：对应 HTML 表单的
text、password、hidden、textarea 标签 • form:radiobutton：单选框组件标签，当表单 bean
对应的 属性值和 value 值相等时，单选框被选中 • form:radiobuttons：单选框组标签，用于构造多个单选 框–
items：可以是一个 List、String[] 或 Map – itemValue：指定 radio 的 value 值。可以是集合中
bean 的一个 属性值 – itemLabel：指定 radio 的 label 值 – delimiter：多个单选框可以通过
delimiter 指定分隔符
form:checkbox：复选框组件。用于构造单个复选框 • form:checkboxs：用于构造多个复选框。使用方式同
form:radiobuttons 标签
• form:select：用于构造下拉框组件。使用方式同
form:radiobuttons 标签
• form:option：下拉框选项组件标签。使用方式同
form:radiobuttons 标签
• form:errors：显示表单组件或数据校验所对应的错误 – <form:errors path= “ ” /> ：显示表单所有的错误
– <form:errors path= “ user” /> ：显示所有以 user 为前缀的属性对应
的错误
– <form:errors path= “ username” /> ：显示特定表单对象属性的错误
- 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。
<%@ 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>
<!--
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(){
$(".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>
<br><br>
<a href="emp">Add New Employee</a>
</body>
</html>
package com.atguigu.springmvc.crud.entities;
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.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.springmvc.crud.dao.DepartmentDao;
import com.atguigu.springmvc.crud.dao.EmployeeDao;
import com.atguigu.springmvc.crud.entities.Employee;
@Controller
public class EmployeeHandler {
@Autowired
private EmployeeDao employeeDao;
@Autowired
private DepartmentDao departmentDao;
@ModelAttribute
public void GetElement(@RequestParam(value = "id", required = false) Integer id, Map<String, Object> map) {
if (id != null) {
map.put("employee", employeeDao.get(id));
}
}
// 更新数据
@RequestMapping(value = "/emp", method = RequestMethod.PUT)
public String Update(Employee employee) {
employeeDao.save(employee);
return "redirect:/emps";
}
//根据id显示数据
@RequestMapping(value = "/emp/{id}", method = RequestMethod.GET)
public String input(@PathVariable("id") Integer id, Map<String, Object> map) {
map.put("employee", employeeDao.get(id));
map.put("departments", departmentDao.getDepartments());
return "input";
}
//根据id删除数据
@RequestMapping(value = "/emp/{id}", method = RequestMethod.DELETE)
public String delete(@PathVariable("id") Integer id) {
employeeDao.delete(id);
System.out.println("删除成功");
return "redirect:/emps";
}
//校验数据
@RequestMapping(value = "/emp", method = RequestMethod.POST)
public String save(@Valid Employee employee, Errors result, Map<String, Object> map) {
System.out.println("save: " + employee);
if (result.getErrorCount() > 0) {
System.out.println("god,出错了!");
for (FieldError error : result.getFieldErrors()) {
System.out.println(error.getField() + ":" + error.getDefaultMessage());
}
// 若验证出错, 则转向定制的页面
map.put("departments", departmentDao.getDepartments());
return "input";
}
employeeDao.save(employee);
return "redirect:/emps";
}
@RequestMapping(value = "/emp", method = RequestMethod.GET)
public String input(Map<String, Object> map) {
System.out.println("测试get方法");
map.put("departments", departmentDao.getDepartments());
map.put("employee", new Employee());
return "input";
}
@RequestMapping("/emps")
public String list(Map<String, Object> map) {
map.put("employees", employeeDao.getAll());
return "list";
}
}
配置文件
- 导入jar包
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"
xmlns:c="http://www.springframework.org/schema/c"
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">
<!-- 配置自动扫描的包 -->
<context:component-scan
base-package="com.atguigu.springmvc,com.qst,com.qsaat.list"></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>
<mvc:default-servlet-handler />
<mvc:annotation-driven></mvc:annotation-driven>
<!-- 配置国际化资源文件 -->
<bean id="messageSource"
class="org.springframework.context.support.ResourceBundleMessageSource">
<property name="basename" value="i18n"></property>
</bean>
</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">
<!-- 配置 SpringMVC 的 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: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>
<!-- 配置 HiddenHttpMethodFilter: 把 POST 请求转为 DELETE、PUT 请求 -->
<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>
/**
* ___====-_ _-====___
* _--^^^#####// \\#####^^^--_
* _-^##########// ( ) \\##########^-_
* -############// |\^^/| \\############-
* _/############// (@::@) \\############\_
* /#############(( \\// ))#############\
* -###############\\ (oo) //###############-
* -#################\\ / VV \ //#################-
* -###################\\/ \//###################-
* _#/|##########/\######( /\ )######/\##########|\#_
* |/ |#/\#/\#/\/ \#/\##\ | | /##/\#/ \/\#/\#/\#| \|
* ` |/ V V ` V \#\| | | |/#/ V ' V V \| '
* ` ` ` ` / | | | | \ ' ' ' '
* ( | | | | )
* __\ | | | | /__
* (vvv(VVV)(VVV)vvv)
* 神兽保佑
* 代码无BUG!
*/