struts2批量封装到set/list元素（转载）
这个应该是属于Struts2类型转换的话题，本篇主要是讨论如何将页面上表单的值批量封装到一个Set集合中去，因为项目中用的是Hibernate，基本上所有的集合类型用的都是Set类型。至于如何批量封装数据到其它的集合类型如(List，Map)可以参看这篇文章，说的很详细了：http://hi.baidu.com/wava/blog/item/01d58926c42dac158b82a134.html。如何给这个Set属性赋值花费了我相当的时间，下面直接贴例子吧。
CustomerInserterAction.java：处理请求，含有一个Set类型的属性orders
package test.web;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import test.persistence.Customer;
import test.persistence.Order;
import test.service.ICustomerService;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ActionContext;
/**
* @author zhukai 2007-8-31
*
*/
public class CustomerInserterAction extends ActionSupport {
private Customer customer;
private Set<Order> orders=new HashSet();
private ICustomerService customerService;
public Customer getCustomer() {
return customer;
}
public void setCustomer(Customer customer) {
//customer.setOrders(orders);
this.customer = customer;
}
public String execute() {
customer.setOrders(orders);
for(Order order:orders)
order.setCustomer(customer);
customerService.addCustomer(customer);
return SUCCESS;
}
public Set getOrders() {
return orders;
}
public void setOrders(Set orders) {
this.orders = orders;
}
public ICustomerService getCustomerService() {
return customerService;
}
public void setCustomerService(ICustomerService customerService) {
this.customerService = customerService;
}
}
Customer.java和Order.java：两个实体类，分别代表一个消费者和一个订单，并且一个消费
者可以有多个订单，而一个订单只属于一个消费者。
package test.persistence;
import java.io.Serializable;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
/**
* @author zhukai
*/
public class Customer implements Serializable {
private Long id;
private String name;
private String email;
private String password;
private String phone;
private boolean married;
private String address;
private char sex;
private String description;
private Date birthday;
private Date registeredTime;
private Set orders = new HashSet();
/**
* hibernate要求持久化类必须提供一个不带参数的默认构造方法
*/
public Customer() {
// TODO Auto-generated constructor stub
}
public Customer(String name) {
super();
this.name = name;
}
public Customer(String name, Set orders) {
super();
this.name = name;
this.orders = orders;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;//
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public Date getRegisteredTime() {
return registeredTime;
}
public void setRegisteredTime(Date registeredTime) {
this.registeredTime = registeredTime;
}
public char getSex() {
return sex;
}
public void setSex(char sex) {
this.sex = sex;
}
public Set getOrders() {
return orders;
}
public void setOrders(Set orders) {
this.orders = orders;
}
public boolean isMarried() {
return married;
}
public void setMarried(boolean married) {
this.married = married;
}
}
reg.jsp：前台页面，用于输入数据
<%@ page language="java" contentType="text/html; charset=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></title>
</head>
<body>
<div style="color:red">
<s:fielderror />
</div>
<form action="register.action" method="post">
<table width="389" border="1" align="center">
<tr>
<th height="30" colspan="4" scope="col"></th>
</tr>
<tr>
<td width="65" height="30">姓名</td>
<td width="68"><input name="customer.name" type="text" id="customer.name" size="10"></td>
<td width="75">电子邮箱</td>
<td width="153"><input name="customer.email" type="text" id="customer.email" size="10"></td>
</tr>
<tr>
<td height="30">地址</td>
<td><input name="customer.address" type="text" id="customer.address" size="10"></td>
<td>电话</td>
<td><input name="customer.phone" type="text" id="customer.phone" size="10"></td>
</tr>
<tr>
<td height="30">密码</td>
<td><input name="customer.password" type="text" id="customer.address" size="10"></td>
<td>性别</td>
<td><input name="customer.sex" type="radio" id="customer.sex" size="10" value="M" checked="checked">男 <input name="customer.sex" type="radio" id="customer.sex" size="10" value="F">女</td>
</tr>
<tr>
<td height="30">出生日期</td>
<td><input name="customer.birthday" type="text" id="customer.address" size="10"></td>
<td>注册日期</td>
<td><input name="customer.registerTime" type="text" id="customer.phone" size="10"></td>
</tr>
<tr>
<td height="30" colspan="4">订单一</td>
</tr>
<tr>
<td height="30">订单号</td>
<td><input name="orders.makeNew[0].orderNumber" type="text" size="10"></td>
<td>配送地址</td>
<td><input name="orders.makeNew[0].address" type="text" size="10"></td>
</tr>
<tr>
<td height="30" colspan="4">订单二</td>
</tr>
<tr>
<td height="30">订单号</td>
<td><input name="orders.makeNew[1].orderNumber" type="text" size="10"></td>
<td>配送地址</td>
<td><input name="orders.makeNew[1].address" type="text" size="10"></td>
</tr>
<tr>
<td height="30" colspan="4">订单三</td>
</tr>
<tr>
<td height="30">订单号</td>
<td><input name="orders.makeNew[2].orderNumber" type="text" size="10"></td>
<td>配送地址</td>
<td><input name="orders.makeNew[2].address" type="text" size="10"></td>
</tr>
<tr>
<td height="30" colspan="4"><input type="submit" value="提交"><input type="reset" value="重置"> </td>
</tr>
<tr>
</table>
</form>
</body>
</html>
CustomerInserterAction-conversion.properties：类型转换的配置文件，我的内容如下
KeyProperty_orders=id
Element_orders=test.persistence.Order
CreateIfNull_orders=true
有几个要说明的地方，这时封装Set集合时必须要注意的：
1．CustomerInserterAction.java中对orders必须要初始化，如下所示：
private Set<Order> orders=new HashSet();
2．在jsp页面中给变量命名时必须要按照如下的格式：
<input name="orders.makeNew[0].orderNumber" type="text" size="10">
必须要使用makeNew运算符，这样ognl才能帮我创建新的对象，否则orders会为空。当时如果集合类型是List，就不必这样，直接name="orders[0].orderNumber"就可以了。
3．在Class-conversion.properties文件中加上KeyProperty_orders=id，这是封装Set时必须的。这个主要是用来设置检索集合中元素时的索引，具体含义可以参看http://wiki.javascud.org/display/ww2cndoc/Type%20Conversion，它里面对类型转换配置文件做了详细的介绍。
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