大家帮我看看这是怎么回事？？
在做Struts2 OptionTransferSelect标签使用练习时，想实现一个“双向选择器”，并找到了一段这样的代码：
1. Action层
TransferSelect.java
package com.mobilesoft.esales.webapp.action;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.log4j.Logger;
public class TransferSelect extends BaseAction {
private static final Logger logger = Logger.getLogger(DoubleListAction.class);
String[] leftRoles;
String[] rightRoles;
public String execute(){
return SUCCESS;
}
public String transferSelect(){
ArrayList<Roles> leftList=new ArrayList<Roles> ();
Roles leftRoles1=new Roles();
leftRoles1.setRoleId(1);
leftRoles1.setRoleName("角色1");
Roles leftRoles2=new Roles();
leftRoles2.setRoleId(2);
leftRoles2.setRoleName("角色2");
Roles leftRoles3=new Roles();
leftRoles3.setRoleId(3);
leftRoles3.setRoleName("角色3");
Roles leftRoles4=new Roles();
leftRoles4.setRoleId(4);
leftRoles4.setRoleName("角色4");
leftList.add(leftRoles1);
leftList.add(leftRoles2);
leftList.add(leftRoles3);
leftList.add(leftRoles4);
ArrayList<Roles> rightList=new ArrayList();
Roles rightRoles1=new Roles();
rightRoles1.setRoleId(1);
rightRoles1.setRoleName("角色5");
Roles rightRoles2=new Roles();
rightRoles2.setRoleId(2);
rightRoles2.setRoleName("角色6");
Roles rightRoles3=new Roles();
rightRoles3.setRoleId(3);
rightRoles3.setRoleName("角色7");
Roles rightRoles4=new Roles();
rightRoles4.setRoleId(4);
rightRoles4.setRoleName("角色8");
rightList.add(rightRoles1);
rightList.add(rightRoles2);
rightList.add(rightRoles3);
rightList.add(rightRoles4);
getRequest().setAttribute("rightList", rightList);
getRequest().setAttribute("leftList", leftList);
return SUCCESS;
}
public String transferSelectPost(){
Map map=getRequest().getParameterMap();
Set set=map.entrySet();
Iterator iterator=set.iterator();
while(iterator.hasNext()){
Map.Entry mapEntry=(Map.Entry)iterator.next();
if(mapEntry.getValue() instanceof String[]){
String[] selectValues=(String[])mapEntry.getValue();
for(int i=0;i<selectValues.length;i++){
logger.fatal("For map test，The key is: "+mapEntry.getKey()+",value is :"+selectValues[i]);
}
}
}
for(int i=0;i<leftRoles.length;i++){
logger.fatal("For Array test,The leftRoles roleName is: "+leftRoles[i]);
}
for(int i=0;i<rightRoles.length;i++){
logger.fatal("For Array test,The rightRoles roleName is: "+rightRoles[i]);
}
getRequest().setAttribute("map", map);
return SUCCESS;
}
public void setLeftRoles(String[] leftRoles) {
this.leftRoles = leftRoles;
}
public void setRightRoles(String[] rightRoles) {
this.rightRoles = rightRoles;
}
}
Roles.java
package com.mobilesoft.esales.webapp.action;
public class Roles {
private Integer roleId;
private String roleName;
public Roles(){
}
public Integer getRoleId() {
return roleId;
}
public void setRoleId(Integer roleId) {
this.roleId = roleId;
}
public String getRoleName() {
return roleName;
}
public void setRoleName(String roleName) {
this.roleName = roleName;
}
}
2. Web层
transferselect.jsp
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ page language="java" errorPage="/error.jsp" pageEncoding="GBK" contentType="text/html;charset=GBK" %>
<html>
<head>
<title>Struts 2 Cool Tags - OptionTransferSelect</title>
<s:head theme="ajax"/>
</head>
<body>
<h2>用户角色授权</h2>
<s:form action="transferSelectPost" name="form1" >
<s:optiontransferselect
label="测试-Action数据"
name="leftRoles"
leftTitle="用户已授权角色"
list="#request.leftList"
listKey="roleId"
listValue="roleName"
multiple="true"
headerKey="headerKey"
headerValue="--- 请选择用户角色 ---"
emptyOption="false"
allowUpDownOnLeft="false"
cssStyle="width:200px;height:300px;"
rightTitle="用户未授权的角色"
doubleList="#request.rightList"
doubleListKey="roleId"
doubleListValue="roleName"
doubleName="rightRoles"
doubleHeaderKey="doubleHeaderKey"
doubleHeaderValue="--- 请选择用户角色 ---"
doubleEmptyOption="false"
doubleMultiple="true"
allowUpDownOnRight="false"
doubleCssStyle="width:200px;height:300px;"
/>
<s:submit align="left"/>
</s:form>
</body>
</html>
transferselectpost.jsp
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ page language="java" errorPage="/error.jsp" pageEncoding="GBK" contentType="text/html;charset=GBK" %>
<html>
<head>
<title>Struts 2 Cool Tags - OptionTransferSelect</title>
<s:head />
</head>
<body>
<h2>选择结果</h2>
<s:form action="transferSelect" name="form1" >
<s:iterator value="#request.map" status="mystatus">
<tr>
<td>
<s:property value="key" />:<s:property value="value" />,
</td>
</tr>
</s:iterator>
<s:submit align="left"/>
</s:form>
</body>
</html>
3. struts.xml
<action name="transferSelect" method="transferSelect" class="com.mobilesoft.esales.webapp.action.TransferSelect">
<result name="success">test/transferselect.jsp</result>
</action>
<action name="transferSelectPost" method="transferSelectPost" class="com.mobilesoft.esales.webapp.action.TransferSelect">
<result name="success">test/transferselectpost.jsp</result>
</action>
我试了一下，报如下错误：
1."BaseAction cannot be resolved to a type."
2."SUCCESS cannot be resolved."
3."getRequest() is undefined."
到底是怎么回事啊，是我缺少什么库吗？
[解决办法]
[解决办法]
public class TransferSelect extends ActionSupport