在Struts2中，選項選擇組件是兩個「updownselect」選擇部件在左，右側對齊，在它們中間，包含按鈕來移動自己的選擇選項。通過<s:optiontransferselect>標籤這可以創建。

這裏創建一個Web工程：strut2updownselect，來演示在多個複選框如何設置的默認值，整個項目的結構如下圖所示：

Struts2

<s:optiontransferselect
label="Lucky Numbers"
name="leftNumber"
list="{'1 - One ', '2 - Two', '3 - Three', '4 - Four', '5 - Five'}"
doubleName="rightNumber"
doubleList="{'10 - Ten','20 - Twenty','30 - Thirty','40 - Forty','50 - Fifty'}"
/>

「name」和「list」是指向左選擇組件;而「doubleName」和「doubleList」是指在正確的選擇組。

產生下面的HTML，兩個「updownselect」組件，按鈕和JavaScript來自己動(默認的XHTML主題)之間的選擇選項。

Lucky Numbers:

Struts2 <s:optiontransferselect> 示例

一個完整的全面的 <s:optiontransferselect> 標籤例子，表明使用OGNL和Java列出來填充數據到「選項中選擇轉移」的組件。

1. 動作類

Action類來生成並存儲左右選擇選項。

OptionTransferSelectAction.java

package com.yiibai.common.action;

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

import com.opensymphony.xwork2.ActionSupport;

public class OptionTransferSelectAction extends ActionSupport{

private List<String> leftAntivirusList = new ArrayList<String>();
private List<String> rightAntivirusList = new ArrayList<String>();

private String leftAntivirus;
private String rightAntivirus;

private String leftNumber;
private String rightNumber;

public OptionTransferSelectAction(){

    leftAntivirusList.add("Norton 360 Version 4.0");
    leftAntivirusList.add("McAfee Total Protection 2010");
    leftAntivirusList.add("Trend Micro IS Pro 2010");
    leftAntivirusList.add("BitDefender Total Security 2010");

    rightAntivirusList.add("Norton Internet Security 2010");
    rightAntivirusList.add("Kaspersky Internet Security 2010");
    rightAntivirusList.add("McAfee Internet Security 2010");
    rightAntivirusList.add("AVG Internet Security 2010");
    rightAntivirusList.add("Trend Micro Internet Security 2010");
    rightAntivirusList.add("F-Secure Internet Security 2010");

}

public String getLeftNumber() {
    return leftNumber;
}

public void setLeftNumber(String leftNumber) {
    this.leftNumber = leftNumber;
}

public String getRightNumber() {
    return rightNumber;
}

public void setRightNumber(String rightNumber) {
    this.rightNumber = rightNumber;
}

public List<String> getLeftAntivirusList() {
    return leftAntivirusList;
}

public void setLeftAntivirusList(List<String> leftAntivirusList) {
    this.leftAntivirusList = leftAntivirusList;
}

public List<String> getRightAntivirusList() {
    return rightAntivirusList;
}

public void setRightAntivirusList(List<String> rightAntivirusList) {
    this.rightAntivirusList = rightAntivirusList;
}

public String getLeftAntivirus() {
    return leftAntivirus;
}

public void setLeftAntivirus(String leftAntivirus) {
    this.leftAntivirus = leftAntivirus;
}

public String getRightAntivirus() {
    return rightAntivirus;
}

public void setRightAntivirus(String rightAntivirus) {
    this.rightAntivirus = rightAntivirus;
}

public String execute() throws Exception{

    return SUCCESS;
}

public String display() {
    return NONE;
}

}

2. 結果頁面

通過「<s:optiontransferselect>」選項轉移選擇組件標籤渲染，並通過Java和OGNL列表產生左側和右側選擇選項。

optiontransferselect.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>

Struts 2 optiontransferselect 示例

<s:form action="resultAction" namespace="/" method="POST" >

<s:optiontransferselect
label="Favourite Antivirus"
name="leftAntivirus"
leftTitle="Left Antivirus Title"
rightTitle="Right Antivirus Title"
list="leftAntivirusList"
multiple="true"
headerKey="-1"
headerValue="--- Please Select ---"
doubleList="rightAntivirusList"
doubleName="rightAntivirus"
doubleHeaderKey="-1"
doubleHeaderValue="--- Please Select ---"
/>

<s:submit value="submit" name="submit" />

result.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>

Struts 2 optiontransferselect example

Left AntiVirus :

Right AntiVirus :

Left Numbers :

Right Numbers :

3. struts.xml

/pages/optiontransferselect.jsp

/pages/result.jsp

4. 實例

http://localhost:8080/struts2optiontransferselect/optionTransferSelectAction.action