解決Struts2中的s:optiontransferselect排序後的數據獲取的問題

今天在學習struts2標籤s:optiontransferselect的時候遇到一個問題,就是從新排序後的數據回傳到action或後臺的的問題,找了一個晚自習終於對這個很多程序猿眼中的bug解決了一點點,直接使用這個標籤後運行時火狐的firebug會報錯

<s:form action="orderBack" method="post">
		<s:optiontransferselect 
			leftTitle="未排序試題" name="leftList" list="list"
			listKey="id" listValue="name" headerKey="cnKey" 
			cssStyle="width:100px;height:200px"
			
			label="試題排序"
			addToLeftLabel="向左移動" addToRightLabel="向右移動"
			addAllToRightLabel="全部導入右側" addAllToLeftLabel="全部導入左側"
			selectAllLabel="選中所有" id="leftListId" 
			leftUpLabel="上移" leftDownLabel="下移"
			
			rightTitle="已排序試題"
			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>

通過進入struts2內部的處理機制分析,是在加載util.js的時候出現的問題

解決辦法就是將其解壓出來從外部鏈接到頁面,但是這裏只用到了submit的提交的事件註冊,所以

只用將以下代碼引入就可以解決這個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>

這麼說可能有點抽象,下面是我寫的一個小事例希望能夠幫助大家

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>所有試題</title>
</head>
<body>
	<table border="1" width="300px">
		<tr>
			<td>順序</td>
			<td>試題名稱</td>
		</tr>
		<s:iterator value="list">
			<tr>
				<td>題號:<s:property value="id" /></td>
				<td>試題:<s:property value="name" /></td>
			</tr>
		</s:iterator>
	</table>

	<s:a href="order">試題排序</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類

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類

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;
	// 未排序的數組
	private List<Question> list = new ArrayList<Question>();

	// 已排序試題
	private List<Question> orderList = new ArrayList<Question>();

	// 排序後的數組,由於之前的頁面提交後會在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中設置的doubleName的值
	// 這個數據會跟隨提交自動的傳入到action類中的同名函數進行賦值
	
	
	
	//會得到一個右邊的列表排序後的id的數組
	//普通的數據類型會自動轉換類型將String轉換爲Integer
	private Integer[] rightList;

	private List<Question> getAll() {

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

	// 模擬數據庫
	public String findAll() {
		list = getAll();
		return SUCCESS;
	}

	// 傳遞數據
	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;
	}

	//獲取前臺傳入的排序後的列表的ID列表
	public Integer[] getRightList() {
		return rightList;
	}

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

	public String orderBack() {
		//直接獲取原始的數據
		list = getAll();
		//遍歷
		for (int i = 0; i < rightList.length; i++) {
			//通過遍歷
			//從原始數據中查詢數據,按照排序後的id的查詢
			//如果是Map的時候直接根據key進行查詢
			//rightList[i]------------獲取的是排序後數組中的一個id數據,
			//由於試題的原始數據是順序的所以通過試題id-1可以得到當前的試題的所在的位置下標
			//list.get(index);--------獲取指定下標的集合中的元素
			//orderList.add();-------向排序後的集合加入數據
			//從而得到排序後的集合
			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>排列試題</title>

<!-- 由於struts2的內部的bug必須進行手動加載util.js文件 -->
<!-- 這裏只用到了StrutsUtils所以只用手動加載一下代碼就可以直接用submit控件,將數據提交的後臺, -->
<!-- 提交後的數據目前我只找到了doubleName指定名稱的集合是重新排列 doubleListKey後的一個數組,
這個數組可以在後臺通過同名函數獲取-->
<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="未排序試題" name="leftList" list="list"
			listKey="id" listValue="name" headerKey="cnKey" 
			cssStyle="width:100px;height:200px"
			
			label="試題排序"
			addToLeftLabel="向左移動" addToRightLabel="向右移動"
			addAllToRightLabel="全部導入右側" addAllToLeftLabel="全部導入左側"
			selectAllLabel="選中所有" id="leftListId" 
			leftUpLabel="上移" leftDownLabel="下移"
			
			rightTitle="已排序試題"
			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>所有試題</title>
</head>
<body>
	<table border="1" width="300px">
		<tr>
			<td>順序</td>
			<td>試題名稱</td>
		</tr>
		<s:iterator value="orderList">
			<tr>
				<td>題號:<s:property value="id" /></td>
				<td>試題:<s:property value="name" /></td>
			</tr>
		</s:iterator>
	</table>

	<s:a href="order">試題排序</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>

解決Struts2中的s:optiontransferselect排序後的數據獲取的問題

公司剛入職了一名 Java 中級開發，短短 4 行代碼居然湊齊了 3 個 bug！我哭了~~

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