一个简单的主从表的增删改，采用 struts+hibernate

         网上有关主从表提交的资料非常的少，可怜我刚刚入门，一切都得自己想办法解决，经过N天的努力，总算是搞定了。程序写的有点徒省事，所以请别见笑。
        本来想用struts-nested标签来实现的，折腾了7个小时都搞不定，最后还是用jstl的方式搞定，最然笨了点，但是看着比较容易懂。
         下面的代码是主要部分，完整代码请送附件下载(注意编码为utf-8)
用了以下包 dom4j,hibernate3,struts1.2,junit,几个常用apache-commons包，cglib,ehcache,mysql-connector，附件代码里面没有把这些库打包，如果要运行请自己网上下载吧，反正都是开源的

参考文章 www.learntechnology.net/struts-nested.do

这是CustomerAction的部分代码

java 代码

public class CustomerAction extends DispatchAction {
    /**
     * 打开客户增加页面
     * @param mapping
     * @param form
     * @param request
     * @param response
     * @return
     * @throws Exception
     */
    public ActionForward openAddCustomer(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
        CustomerValueObject customer = new CustomerValueObject();
        request.setAttribute(Constants.customerBean, customer);
        return mapping.findForward("toAddCustomer");
    }

    /**
     * 保存客户信息
     * @param mapping
     * @param form
     * @param request
     * @param response
     * @return
     * @throws Exception
     */
    public ActionForward saveCustomer(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
        CustomerForm customerForm = (CustomerForm)form;
        Customers customer = null;
        long customerId = customerForm.getCustomer().getId();
        //根据customers.id是否为空判断是插入还是更新
        if (customerForm.getCustomer().getId() == 0){
            customer = this.customerValueObject2Customers(customerForm.getCustomer());
        }else if (customerForm.getCustomer().getId() > 0){
            String hqlString = "select c from Customers c left join fetch c.orderses o where c.id = ?";
            customer = customerDao.getObject(hqlString, new Object[]{new Long(customerId)});
            //或许这里可以用BeanUtils.copyProperty来复制bean的属性，但我试过了，总是报错，索性自己赋值了
            customer.setName(customerForm.getCustomer().getName());
            customer.getOrderses().clear();
            for(Iterator it = customerForm.getCustomer().getOrderses().iterator(); it.hasNext();){
                OrderValueObject orderVo = it.next();
                Orders o = new Orders();
                BeanUtils.copyProperties(o, orderVo);
                customer.getOrderses().add(o);
                o.setCustomers(customer);
            }
        }
        customerDao.saveObject(customer);
        return mapping.findForward("toList");
    }

<ordervalueobject>

下面是用于接收客户信息的值对象的完整代码

</ordervalueobject>

java 代码

package demo.struts.valueobjects;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.collections.Factory;
import org.apache.commons.collections.ListUtils;
/**
 * 客户值对象，用于接收表单提交的客户和订单信息
 * @author Administrator
 *
 */
public class CustomerValueObject implements java.io.Serializable {
    private static final long serialVersionUID = -5142724257544817298L;

    private long id;

    private String name;

    /**
     * 这是关键的一部分，也是和hibernate所用的pojo的唯一区别，这样做是为了解决在没有列表项目的时候，前端页面会报获取第0个元素失败的异常，
     * 这个工具类很好的解决了这个问题，它可以在你访问越界下标元素的时候动态的填充越界的部分，这样就不会报异常了。
     * 下面是这个LazyList的关键代码
     *     public Object get(int index) {
        int size = getList().size();
        if (index < size) {
            // within bounds, get the object
            Object object = getList().get(index);
            if (object == null) {
                // item is a place holder, create new one, set and return
                object = factory.create();
                getList().set(index, object);
                return object;
            } else {
                // good and ready to go
                return object;
            }
        } else {
            // we have to grow the list
            for (int i = size; i < index; i++) {
                getList().add(null);
            }
            // create our last object, set and return
            Object object = factory.create();
            getList().add(object);
            return object;
        }
    }
      */
    @SuppressWarnings("unchecked")
    private List orderses = (List)ListUtils.lazyList(new ArrayList(), new Factory(){
        public OrderValueObject create() {
            return new OrderValueObject();
        }
    });

    public CustomerValueObject() {
    }

    public long getId() {
        return this.id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public List getOrderses() {
        return this.orderses;
    }

    public void setOrderses(List orderses) {
        this.orderses = orderses;
    }
}

<ordervalueobject><ordervalueobject>
下面是表单bean的完整代码，我不知道用动态bean能不能实现，如果你试成功了，请不要忘了告诉我一声。
</ordervalueobject></ordervalueobject>

java 代码

package demo.struts.forms;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.*;
import demo.struts.valueobjects.*;

/**
 * ActionForm的代码，里面负责维护一个客户的值对象
 */
public class CustomerForm extends ActionForm {
    private static final long serialVersionUID = -2128506741766449352L;

    private CustomerValueObject customer;

    public CustomerValueObject getCustomer() {
        return this.customer;
    }

    public void setCustomer(CustomerValueObject customer) {
        this.customer = customer;
    }

    /**
     * 必须在reset中创建客户对象
     */
    @Override
    public void reset(ActionMapping mapping, HttpServletRequest request) {
        customer = new CustomerValueObject();
        super.reset(mapping, request);
    }

    @Override
    public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) {
        return super.validate(mapping, request);
    }
}

这是创建客户信息的jsp页面

xml 代码

<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
<%@ taglib uri="http://struts.apache.org/tags-nested" prefix="nested"%>

>
<html>
    <head>
        <html:base />

        <title>新客户和订单<!---->title>

        <meta http-equiv="pragma" content="no-cache">
        <meta http-equiv="cache-control" content="no-cache">
        <meta http-equiv="expires" content="0">
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="This is my page">
        <!---->
        <script type="text/javascript">
        function onAddOrder(url){
            frmCustomer.action = url;
            frmCustomer.target = "_self";
            frmCustomer.submit();
        }

        function onDeleteOrder(url){
            frmCustomer.action = url;
            frmCustomer.submit();
        }

        function onSaveCustomer(url){
            frmCustomer.action = url;
            frmCustomer.submit();
        }
    <!---->script>
    <!---->head>
    <body>
        <table>
            <form name="frmCustomer" method="post">
                <input type="hidden" name="customer.id" value="${customer.id}" />
                <table>
                    <tr>
                        <td>
                            客户名
                        <!---->td>
                        <td>
                            <input name="customer.name" value="${customer.name}" />
                        <!---->dh>
                    <!---->tr>
                    <tr>
                        <td colspan="2">
                            订单列表
                        <!---->td>
                    <!---->tr>
                    <tr>
                        <div id="orderList">
                            <table bgcolor="#C0C0C0" width="250px">
                                <tr>
                                    <td>

                                    <!---->td>
                                    <td>
                                        订单号
                                    <!---->td>
                                <!---->tr>
                                    <c:forEach items="${customer.orderses}" var="order" varStatus="orderItems">
                                        <tr>
                                            <td>
                                                <input type="hidden" name="customer.orderses[${orderItems.index}].id" value="${order.id}" />
                                            <!---->td>
                                            <td>
                                                <input type="text" name="customer.orderses[${orderItems.index}].orderNumber" value="${order.orderNumber}" />
                                            <!---->td>
                                            <td>
                                                <c:url var="deleteOrderUrl" value="/customers.do?method=deleteOrder">
                                                    <c:param name="index" value="${orderItems.index}" />
                                                    <c:param name="action" value="add" />
                                                <!---->c:url>
                                                <a href="javascript:onDeleteOrder('${deleteOrderUrl}');">删除订单<!---->a>
                                            <!---->td>
                                        <!---->tr>
                                    <!---->c:forEach>
                                <tr>
                                    <td align="right" colspan="2">
                                        <c:url var="addOrderUrl" value="/customers.do?method=addOrder">
                                            <c:param name="action" value="add" />
                                        <!---->c:url>
                                        <a href="javascript:onAddOrder('${addOrderUrl}');">添加订单<!---->a>
                                    <!---->td>
                                <!---->tr>
                            <!---->table>
                        <!---->div>
                    <!---->tr>
                <!---->table>
            <!---->form>
            <tr>
                <td colspan="2">
                    <c:url var="saveCustomerUrl"
                        value="/customers.do?method=saveCustomer" />
                    <html:link href="javascript:onSaveCustomer('${saveCustomerUrl}');">保存客户表单<!---->html:link>
                <!---->td>
            <!---->tr>
        <!---->table>
    <!---->body>
<!---->html>

<c:url var="saveCustomerUrl">
</c:url>

评论

1 楼 wshcdr 2012-06-24  

MARK一记