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&nbsp;<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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1 楼 Neoman 2012-07-05  

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