批量封装对象(Bean)
不知道大家是否遇过这种情况,在一个页面里同时提交几个对象。例如,在发布产品的页面,同时发布几个产品。我在之前一个项目就遇到过这种需求,当时用的是Struts 1.x。那是一个痛苦的经历,我在Google搜了很久都没有理想的结果。幸运的是,在Struts 2.0中这种痛苦将一去不复返。下面我就演示一下如何实现这个需求。
首先,在源代码文件夹下的tutorial包中新建Product.java文件,内容如下:
package tutorial;
import java.util.Date;
publicclass Product {
private String name;
privatedouble price;
private Date dateOfProduction;
public Date getDateOfProduction() {
return dateOfProduction;
}
publicvoid setDateOfProduction(Date dateOfProduction) {
this.dateOfProduction = dateOfProduction;
}
public String getName() {
return name;
}
publicvoid setName(String name) {
this.name = name;
}
publicdouble getPrice() {
return price;
}
publicvoid setPrice(double price) {
this.price = price;
}
}
然后,在同上的包下添加ProductConfirm.java类,代码如下:
package tutorial;
import java.util.List;
import com.opensymphony.xwork2.ActionSupport;
publicclass ProductConfirm extends ActionSupport {
public List<Product> products;
public List<Product> getProducts() {
return products;
}
publicvoid setProducts(List<Product> products) {
this.products = products;
}
@Override
public String execute() {
for(Product p : products) {
System.out.println(p.getName() + " | "+ p.getPrice() +" | " + p.getDateOfProduction());
}
return SUCCESS;
}
}
接看,在同上的包中加入ProductConfirm-conversion.properties,代码如下:
Element_products=tutorial.Product
再在struts.xml文件中配置ProductConfirm Action,代码片段如下:
<action name="ProductConfirm" uri="/struts-tags"%>
<html>
<head>
<title>Hello World</title>
</head>
<body>
<s:form action="ProductConfirm" theme="simple">
<table>
<tr style="background-color:powderblue; font-weight:bold;">
<td>Product Name</td>
<td>Price</td>
<td>Date of production</td>
</tr>
<s:iterator value="new int[3]" status="stat">
<tr>
<td><s:textfield name="%{'products['+#stat.index+'].name'}"/></td>
<td><s:textfield name="%{'products['+#stat.index+'].price'}"/></td>
<td><s:textfield name="%{'products['+#stat.index+'].dateOfProduction'}"/></td>
</tr>
</s:iterator>
<tr>
<td colspan="3"><s:submit /></td>
</tr>
</table>
</s:form>
</body>
</html>
在同样的文件夹下创建ShowProducts.jsp,内容如下:
<%@ page contentType="text/html; charset=UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>Hello World</title>
</head>
<body>
<table>
<tr style="background-color:powderblue; font-weight:bold;">
<td>Product Name</td>
<td>Price</td>
<td>Date of production</td>
</tr>
<s:iterator value="products" status="stat">
<tr>
<td><s:property value="name"/></td>
<td>$<s:property value="price"/></td>
<td><s:property value="dateOfProduction"/></td>
</tr>
</s:iterator>
</table>
</body>
</html>