Struts2_CRUD
1 搭建环境：
eclipase：Luna Release (4.4.0)
sturts2：2.3.28 下载地址：http://download.csdn.net/detail/chuck_kui/9513090
2. 类：
模拟DAO : Dao.java
package com.baidu.struts2.CRUD;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
// DAO
public class Dao {
private static Map<Integer,Employee> empls = new LinkedHashMap<Integer,Employee>(); // 使用 LinkedHashMap 是为了使显示看起来的更有顺序
// 使用静态 模拟 数据库
static {
empls.put(1001,new Employee(1001, "Li", "Ming"));
empls.put(1002,new Employee(1002, "Liu", "Ming"));
empls.put(1003,new Employee(1003, "Zhang", "Ming"));
empls.put(1004,new Employee(1004, "Wang", "Ming"));
empls.put(1005,new Employee(1005, "Gong", "Ming"));
}
public List<Employee> getEmployees(){
return new ArrayList<>(empls.values());
}
public void save(Employee e){
long time = -System.currentTimeMillis();
e.setEmplId((int)time);
empls.put(e.getEmplId(), e );
}
public void delete(Integer emplId){
empls.remove(emplId);
}
public void update(Employee e ){
empls.put(e.getEmplId(),e);
}
public Employee get(Integer emplId){
return empls.get(emplId);
}
}
实体类 :Employee.java
package com.baidu.struts2.CRUD;
// 提供实体类
public class Employee {
private Integer emplId;
private String firstName;
private String lastName;
public Employee() {
super();
}
public Employee(Integer emplId, String firstName, String lastName) {
super();
this.emplId = emplId;
this.firstName = firstName;
this.lastName = lastName;
}
public Integer getEmplId() {
return emplId;
}
public void setEmplId(Integer emplId) {
this.emplId = emplId;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
Action ：EmployeeAction.java
package com.baidu.struts2.CRUD;
import java.util.Map;
import org.apache.struts2.interceptor.RequestAware;
import com.opensymphony.xwork2.ModelDriven;
import com.opensymphony.xwork2.Preparable;
public class EmployeeAction implements RequestAware,ModelDriven<Employee>,Preparable{
private Dao dao = new Dao();
private Integer emplId;
public void setEmplId(Integer emplId) {
this.emplId = emplId;
}
public String list(){
request.put("empls", dao.getEmployees());
return "list";
}
public String save(){
dao.save(employee);
return "success";
}
public void prepareSave(){
// 为save 定制的prepare方法
employee = new Employee();
}
public String delete(){
dao.delete(emplId);
return "success";
}
/**
* edit()更新时需要回显，如何回显， 就是下面的三步
* 1. 获取传入的employeeId； employee.getEmployeeId()
* 2. 更加emplId 数据库中获取Employee 对象emp
* 3. 把栈顶的employee 对象装配好
*
* Employee emp = dao.get(employee.getEmplId());
* employee.setFirstName(emp.getFirstName());
* employee.setLastName(emp.getLastName());
*
* 现在被 ModelDriven 和 Preparable 却需要在Struts.xml 中配置 paramsPrepareParamsStack 为默认值栈
*/
public String edit(){
return "edit";
}
public void prepareEdit(){
// 为edit 定制的prepare方法
employee = dao.get(emplId);
}
public String update(){
dao.update(employee);
return "success";
}
public void prepareUpdate(){
// 为update 定制的prepare方法
employee = new Employee();
}
// 为save() 准备request
private Map<String, Object> request;
@Override
public void setRequest(Map<String, Object> arg0) {
this.request = arg0;
}
// 为edit()回显准备
private Employee employee ;
@Override
public Employee getModel() {
return employee;
}
// 为getModel() 通过model
@Override
public void prepare() throws Exception {
System.out.println("prepare....");
}
}
3. 页面：JSP
index.jsp
<%@ 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="emp-list">Employee All List </a>
</body>
</html>
emp-list.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!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>
<s:debug></s:debug>
<center>
<br><br>
<s:form action="emp-save" >
<s:textfield name="firstName" label="FirstName"></s:textfield>
<s:textfield name="lastName" label="LastName"></s:textfield>
<s:submit></s:submit>
</s:form>
<br><br>
<hr>
<table border="1" cellpadding="10" cellspacing="0">
<thead>
<tr>
<td>EmployeeID</td>
<td>FirstName</td>
<td>LastName</td>
<td>Edit</td>
<td>Delete</td>
</tr>
</thead>
<tbody>
<s:iterator value="#request.empls" var="emp">
<tr>
<td>${emplId }</td>
<td>${firstName}</td>
<td>${lastName }</td>
<td><a href="emp-edit?emplId=${emplId }">Edit</a></td>
<td><a href="emp-delete?emplId=${emplId }">Delete</a></td>
</tr>
</s:iterator>
</tbody>
</table>
</center>
</body>
</html>
emp-edit.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!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>
<s:debug></s:debug>
<center>
<br><br>
<s:form action="emp-update" >
<s:hidden name="emplId"></s:hidden>
<s:textfield name="firstName" label="FirstName"></s:textfield>
<s:textfield name="lastName" label="LastName"></s:textfield>
<s:submit></s:submit>
</s:form>
</center>
</body>
</html>
struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<package name="default" namespace="/" extends="struts-default">
<!-- 修改PrepareInterceptor 拦截器的 alwaysInvokePrepare 属性置为 false -->
<interceptors>
<!-- ① 为需要修改的拦截器栈起个名字 baiduStack -->
<interceptor-stack name="baiduStack">
<!-- ② baiduStack 拦截器栈 指向 paramsPrepareParamsStack-->
<interceptor-ref name="paramsPrepareParamsStack">
<!--③ 把 paramsPrepareParamsStack 拦截器栈的 prepare 拦截器 的alwaysInvokePrepare 属性值 修改为false-->
<param name="prepare.alwaysInvokePrepare">false</param>
</interceptor-ref>
</interceptor-stack>
</interceptors>
<!--④ 启用修改后的拦截器栈 baiduStack-->
<default-interceptor-ref name="baiduStack" />
<!-- 配置使用 paramsPrepareParamsStack 作为默认的拦截器栈
<default-interceptor-ref name="paramsPrepareParamsStack"></default-interceptor-ref>
-->
<action name="emp-*" class="com.baidu.struts2.CRUD.EmployeeAction"
method="{1}">
<result name="{1}">/emp-{1}.jsp</result>
<result name="success" type="redirectAction">emp-list</result>
</action>
</package>
</struts>
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_3_0.xsd" id="WebApp_ID" version="3.0"> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
index.jsp
emp-list.jsp
emp-edit.jsp
