Struts1.2应用－批量封装对象

1. 批量发布产品信息效果图：

上图为批量发布产品页面。



上图为显示刚批量发布的产品页面。

2. 具体实现：

2.1. 域模型对象：Product.java

package org.qiujy.domain; import java.sql.Date; /** * 产品---实体域模型类 * @author qiujy * @version 1.0 */ public class Product { private Long id; private String name; private double price; private Date pubTime = new Date(new java.util.Date().getTime()); public Product() { } public Product(Long id, String name, double price, Date pubTime) { this.id = id; this.name = name; this.price = price; this.pubTime = pubTime; } /** * @return the id */ public Long getId() { return id; } /** * @param id * the id to set */ public void setId(Long id) { this.id = id; } /** * @return the name */ public String getName() { return name; } /** * @param name * the name to set */ public void setName(String name) { this.name = name; } /** * @return the price */ public double getPrice() { return price; } /** * @param price * the price to set */ public void setPrice(double price) { this.price = price; } /** * @return the pubTime */ public Date getPubTime() { return pubTime; } /** * @param pubTime * the pubTime to set */ public void setPubTime(Date pubTime) { this.pubTime = pubTime; } }

在这个类中日期的类型用的是java.sql.Date，而不是java.util.Date。这是因为Struts 1.x不支持请求参数到java.util.Date的转换，归根到底是由于org.apache.commons.beanutils.ConvertUtilsBean.convert()不支持关于java.util.Date的转换。另外，值得注意的是common-beanutils是通过java.sql.Date.valueOf()方法工作的，所以在页面输入的字符串的格式必须为“yyyy-MM-dd”。

2.2. 创建一个自定义列表集合：

它继承自LinkedList类，重写get()方法，作用就是在Struts 1.x框架调用这个方法时，如果index超出列表大小，则会实例化新项放到列表中，避免出现(IndexOutOfBoundsException)异常。

package org.qiujy.common; import java.util.LinkedList; /** * 类说明: 供ActionForm中使用，以避免OutOfIndexException * 注意：不要在其他地方使用本类 * @author qiujy * @version 1.0 */ public class AutoInitArrayList extends LinkedList{ /** 容器内保存的类 */ private Class clazz; /**私有构造函数，保证外界无法直接实例化*/ private AutoInitArrayList() { } public AutoInitArrayList(Class clazz) { this.clazz = clazz; } /** * save the updates of customer types. */ public Object get(int index) { try { if (super.size() < index + 1) { int cnt = index + 1 - super.size(); for (int i = 0; i < cnt; i++) { super.add(clazz.newInstance()); } } } catch (InstantiationException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } return super.get(index); } }

2.3. Struts-config.xml：

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd"> <struts-config> <data-sources /> <form-beans > <form-bean name="batchWrappingForm" type="org.qiujy.web.struts.form.BatchWrappingForm" /> </form-beans> <global-exceptions /> <global-forwards /> <action-mappings > <action attribute="batchWrappingForm" input="/batchWrapping.jsp" name="batchWrappingForm" path="/batchWrapping" scope="request" parameter="method" type="org.qiujy.web.struts.action.BatchWrappingAction"> <forward name="toCurrent" path="/batchWrapping.jsp"/> <forward name="toList" path="/displayinfo.jsp"/> </action> </action-mappings> <message-resources parameter="org.qiujy.web.struts.ApplicationResources" /> </struts-config>

2.4. Form Bean：

package org.qiujy.web.struts.form; import java.util.List; import org.apache.struts.action.ActionForm; import org.qiujy.common.AutoInitArrayList; import org.qiujy.domain.Product; /** * 批量封装示例Form Bean * @author qiujy * @version 1.0 */ public class BatchWrappingForm extends ActionForm { private int optId; //操作ID private List products = new AutoInitArrayList(Product.class); public BatchWrappingForm(){ } /** * @return the products */ public List getProducts() { return products; } /** * @param products the products to set */ public void setProducts(List products) { this.products = products; } /** *往List中新增一个Product对象 */ publicvoid addItem(){ this.products.add(new Product()); } /** *从List中删除指定索引的Product对象 *@paramindex */ publicvoid deleteItem(int index){ int size = products == null ? 0 : products.size(); if(index >=0 && index < size){ this.products.remove(index); } } /** * @return the optId */ public int getOptId() { return optId; } /** * @param optId the optId to set */ public void setOptId(int optId) { this.optId = optId; } }

2.5. Action类：

package org.qiujy.web.struts.action; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.actions.DispatchAction; import org.qiujy.web.struts.form.BatchWrappingForm; /** * 批量封装示例Action * @author qiujy * @version 1.0 */ public class BatchWrappingAction extends DispatchAction { /** * 保存所有的产品 * @param mapping * @param form * @param request * @param response * @return */ public ActionForward saveAll(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { BatchWrappingForm batchWrappingForm = (BatchWrappingForm) form; List temp = batchWrappingForm.getProducts(); request.setAttribute("products", temp); return mapping.findForward("toList"); } /** * 新增一项 * @param mapping * @param form * @param request * @param response * @return */ public ActionForward addItem(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { BatchWrappingForm batchWrappingForm = (BatchWrappingForm) form; batchWrappingForm.addItem(); return mapping.findForward("toCurrent"); } /** * 删除当前项 * @param mapping * @param form * @param request * @param response * @return */ public ActionForward deleteItem(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { BatchWrappingForm batchWrappingForm = (BatchWrappingForm) form; batchWrappingForm.deleteItem(batchWrappingForm.getOptId()); return mapping.findForward("toCurrent"); } }

2.6. 输入页面：batchWrapping.jsp

<%@ page language="java" pageEncoding="utf-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%> <html> <head> <title>批量封装对象示例</title> <script type="text/javascript"> <!-- function setParamValue(parameter, value) { if (document.getElementById(parameter) != undefined) { document.getElementById(parameter).value = value; } } //--> </script> </head> <body> <h2 align="center">批量封装对象示例</h2> <hr/> <form action="batchWrapping.do" method="post"> <input type="hidden" name="method" value="saveAll"> <input type="hidden" name="optId"> <table border="0" width="680px" align="center"> <tr style="background-color: powderblue; font-weight: bold;"> <td width="30%">产品名</td> <td width="20%">价格</td> <td width="30%">生产日期</td> <td width="20%">操作</td> </tr> <c:forEach var="prod" items="${batchWrappingForm.products}" varStatus="status"> <tr> <td > <input name="products[${status.index}].name" value="${prod.name}"/> </td> <td> <input name="products[${status.index}].price" value="${prod.price}"/> </td> <td> <input name="products[${status.index}].pubTime" value="<fmt:formatDate value='${prod.pubTime}' type='date'/>"/> </td> <td> <input type="button" value="删除此列" onclick="javascript:setParamValue('optId', '${status.index }');setParamValue('method', 'deleteItem'); this.form.submit();"/> </td> </tr> </c:forEach> <tr style="background-color: powderblue;"> <td colspan="4" align="center"> <input type="submit" value=" 提交 " />  <input type="submit" value=" 重置 " />   <input align="center" type="button" value="新增一列" onclick="javascript:setParamValue('method', 'addItem'); this.form.submit();"/> </td> </tr> </table> </form> </body> </html>

本页面中，最关键的地方是组装<input>的元素名称，Struts 1.2对名称格式类似“xxx[9].xx”的请求，会进行封装。

2.7. 最终显示页面：displayinfo.jsp

<%@ page language="java" pageEncoding="utf-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%> <html> <head> <title>显示批量封装的对象</title> </head> <body> <h2 align="center">显示批量封装的对象</h2> <hr /> <table border="0" width="680px" align="center"> <tr style="background-color: powderblue; font-weight: bold;"> <td width="10%">序号</td> <td width="35%">产品名</td> <td width="20%">价格</td> <td width="35%">生产日期</td> </tr> <c:forEach var="prod" items="${products}" varStatus="status"> <tr> <td><c:out value="${status.count}" /></td> <td><c:out value="${prod.name}" /></td> <td><c:out value="${prod.price}" /></td> <td><fmt:formatDate value='${prod.pubTime}'/></td> </tr> </c:forEach> </table> </body> </html>

3. 参考文档：

http://www.blogjava.net/max/archive/2006/12/08/86439.html

4. 本例源代码：