解决Struts2中的s:optiontransferselect排序后的数据获取的问题 -

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解决Struts2中的s:optiontransferselect排序后的数据获取的问题

今天在学习struts2标签s:optiontransferselect的时候遇到一个问题,就是从新排序后的数据回传到action或后台的的问题,找了一个晚自习终于对这个很多程序猿眼中的bug解决了一点点,直接使用这个标签后运行时火狐的firebug会报错

<s:form action="orderBack" method="post">
		<s:optiontransferselect 
			leftTitle="未排序试题" name="leftList" list="list"
			listKey="id" listValue="name" headerKey="cnKey" 
			cssStyle="width:100px;height:200px"
			
			label="试题排序"
			addToLeftLabel="向左移动" addToRightLabel="向右移动"
			addAllToRightLabel="全部导入右侧" addAllToLeftLabel="全部导入左侧"
			selectAllLabel="选中所有" id="leftListId" 
			leftUpLabel="上移" leftDownLabel="下移"
			
			rightTitle="已排序试题"
			doubleList="orderList" doubleListKey="id" doubleListValue="name"
			doubleName="rightList" doubleHeaderKey="cnKey" doubleMultiple="true"
			doubleId="rightListId" 
			rightUpLabel="上移" rightDownLabel="下移"
			doubleCssStyle="width:100px;height:200px" >


		</s:optiontransferselect>
		<s:submit value="排序完成" />
	</s:form>

通过进入struts2内部的处理机制分析,是在加载util.js的时候出现的问题

解决办法就是将其解压出来从外部链接到页面,但是这里只用到了submit的提交的事件注册,所以

只用将以下代码引入就可以解决这个bug

<script type="text/javascript">
	var StrutsUtils = {};
	StrutsUtils.addEventListener = function(element, name, observer, capture) {
		if (element.addEventListener) {
			element.addEventListener(name, observer, false);
		} else if (element.attachEvent) {
			element.attachEvent('on' + name, observer);
		}
	};
</script>

这么说可能有点抽象,下面是我写的一个小事例希望能够帮助大家

index,jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>
<%@taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>所有试题</title>
</head>
<body>
	<table border="1" width="300px">
		<tr>
			<td>顺序</td>
			<td>试题名称</td>
		</tr>
		<s:iterator value="list">
			<tr>
				<td>题号:<s:property value="id" /></td>
				<td>试题:<s:property value="name" /></td>
			</tr>
		</s:iterator>
	</table>

	<s:a href="order">试题排序</s:a>
	<s:debug />
</body>
</html>

struts2.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
	<package name="exam" namespace="/" extends="struts-default">
		<action name="findAll" class="action.QuestionAction" method="findAll">
			<result name="success">/index.jsp</result>
		</action>
		
		<action name="order" class="action.QuestionAction" method="order">
			<result name="success">/order.jsp</result>
		</action>
		
		<action name="orderBack" class="action.QuestionAction" method="orderBack">
			<result name="success">/list.jsp</result>
		</action>
	</package>


	<!-- Add packages here -->

</struts>

model类

package model;

public class Question {

	private int id;
	private int order;
	private String name;

	public Question(int id, int order, String name) {
		this.id = id;
		this.order = order;
		this.name = name;
	}

	public int getId() {
		return id;
	}

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

	public int getOrder() {
		return order;
	}

	public void setOrder(int order) {
		this.order = order;
	}

	public String getName() {
		return name;
	}

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

}

action类

package action;

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

import model.Question;

import com.opensymphony.xwork2.ActionSupport;

public class QuestionAction extends ActionSupport {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	// 未排序的数组
	private List<Question> list = new ArrayList<Question>();

	// 已排序试题
	private List<Question> orderList = new ArrayList<Question>();

	// 排序后的数组,由于之前的页面提交后会在parameters域中存入
	// parameters
	// {__multiselect_rightList=[Ljava.lang.String;@1206cda0,
	// __multiselect_leftList=[Ljava.lang.String;@7ca5cc9e,
	// rightList=[Ljava.lang.String;@691cd900}
	// 其中的rightList就是s:optiontransferselect中设置的doubleName的值
	// 这个数据会跟随提交自动的传入到action类中的同名函数进行赋值
	
	
	
	//会得到一个右边的列表排序后的id的数组
	//普通的数据类型会自动转换类型将String转换为Integer
	private Integer[] rightList;

	private List<Question> getAll() {

		List<Question> list = new ArrayList<Question>();
		Question q1 = new Question(1, 0, "试题1");
		Question q2 = new Question(2, 0, "试题2");
		Question q3 = new Question(3, 0, "试题3");
		Question q4 = new Question(4, 0, "试题4");
		list.add(q1);
		list.add(q2);
		list.add(q3);
		list.add(q4);
		return list;
	}

	// 模拟数据库
	public String findAll() {
		list = getAll();
		return SUCCESS;
	}

	// 传递数据
	public String order() {
		list = getAll();
		return SUCCESS;
	}

	public List<Question> getList() {
		return list;
	}

	public void setList(List<Question> list) {
		this.list = list;
	}

	public List<Question> getOrderList() {
		return orderList;
	}

	public void setOrderList(List<Question> orderList) {
		this.orderList = orderList;
	}

	//获取前台传入的排序后的列表的ID列表
	public Integer[] getRightList() {
		return rightList;
	}

	public void setRightList(Integer[] rightList) {
		this.rightList = rightList;
	}

	public String orderBack() {
		//直接获取原始的数据
		list = getAll();
		//遍历
		for (int i = 0; i < rightList.length; i++) {
			//通过遍历
			//从原始数据中查询数据,按照排序后的id的查询
			//如果是Map的时候直接根据key进行查询
			//rightList[i]------------获取的是排序后数组中的一个id数据,
			//由于试题的原始数据是顺序的所以通过试题id-1可以得到当前的试题的所在的位置下标
			//list.get(index);--------获取指定下标的集合中的元素
			//orderList.add();-------向排序后的集合加入数据
			//从而得到排序后的集合
			orderList.add(list.get(rightList[i] - 1));
		}
		return SUCCESS;
	}

}

order.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>
<%@taglib prefix="s" uri="/struts-tags"%>
<%@taglib prefix="sx" uri="/struts-dojo-tags"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>排列试题</title>

<!-- 由于struts2的内部的bug必须进行手动加载util.js文件 -->
<!-- 这里只用到了StrutsUtils所以只用手动加载一下代码就可以直接用submit控件,将数据提交的后台, -->
<!-- 提交后的数据目前我只找到了doubleName指定名称的集合是重新排列 doubleListKey后的一个数组,
这个数组可以在后台通过同名函数获取-->
<script type="text/javascript">
	var StrutsUtils = {};
	StrutsUtils.addEventListener = function(element, name, observer, capture) {
		if (element.addEventListener) {
			element.addEventListener(name, observer, false);
		} else if (element.attachEvent) {
			element.attachEvent('on' + name, observer);
		}
	};
</script>




</head>

<body>

	<s:form action="orderBack" method="post">
		<s:optiontransferselect 
			leftTitle="未排序试题" name="leftList" list="list"
			listKey="id" listValue="name" headerKey="cnKey" 
			cssStyle="width:100px;height:200px"
			
			label="试题排序"
			addToLeftLabel="向左移动" addToRightLabel="向右移动"
			addAllToRightLabel="全部导入右侧" addAllToLeftLabel="全部导入左侧"
			selectAllLabel="选中所有" id="leftListId" 
			leftUpLabel="上移" leftDownLabel="下移"
			
			rightTitle="已排序试题"
			doubleList="orderList" doubleListKey="id" doubleListValue="name"
			doubleName="rightList" doubleHeaderKey="cnKey" doubleMultiple="true"
			doubleId="rightListId" 
			rightUpLabel="上移" rightDownLabel="下移"
			doubleCssStyle="width:100px;height:200px" >


		</s:optiontransferselect>
		<s:submit value="排序完成" />
	</s:form>
	<s:debug />
</body>
</html>

list.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>
<%@taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>所有试题</title>
</head>
<body>
	<table border="1" width="300px">
		<tr>
			<td>顺序</td>
			<td>试题名称</td>
		</tr>
		<s:iterator value="orderList">
			<tr>
				<td>题号:<s:property value="id" /></td>
				<td>试题:<s:property value="name" /></td>
			</tr>
		</s:iterator>
	</table>

	<s:a href="order">试题排序</s:a>
	<s:property value="#com.opensymphony.xwork2.ActionContext.parameters['leftList']"/>
	<s:debug />
</body>
</html>

web.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

    <display-name>Struts Blank</display-name>

    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

</web-app>

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