<input type="checkbox" name="user.lockedOut" value="true"/>如果用戶選中這複選框,瀏覽器在查詢串中將會送出"user.lockedOut=true",此時OGNL執行了action.getUser().setLockedOut(true)。如果用戶不選中複選框,瀏覽器將不會送出查詢串,因此,在開始,應確保已經初始化lockedOut 爲false:
private boolean m_lockedOut = false;
public void setLockedOut(boolean lockedOut) { m_lockedOut = lockedOut; }
但更多情況下,我們是把它當做複選(多項選擇)來用,這有兩種情況用checkbox來設置集合:
一.checkbox name相同
在一個String 類型的Set 集合裏面存放許多權限,用checkbox的HTML如下:
<input type="checkbox" name="user.priv" value="boss"/>
<input type="checkbox" name="user.priv" value="admin"/>
<input type="checkbox" name="user.priv" value="manager"/>
比方說,一個用戶選中前面的兩項,瀏覽器將會送出這查詢串: user.priv=boss&user.priv=admin。
OGNL將會處理查詢串:action.getUser().setPriv(String[] {"boss", "admin"})。
Action裏面的方法將會是這樣:
Set m_privileges = new HashSet();
public void setPriv(String[] privs) {
for (int i = 0; i < privs.length; i++) {
m_privileges.add(privs[i]);
}
}
二.checkbox name不同
有三種處理方式:
I.
<input type="checkbox" name="xlist[0].id" value="444">
<input type="checkbox" name="xlist[1].id" value="443">
<input type="checkbox" name="xlist[2].id" value="442">
* Action中用List集合來處理:private List xlist = new XWorkList(User.class)
public List getXlist(){
return xlist;
}
II.
<input type="checkbox" name="xmap['0'].id" value="444">
<input type="checkbox" name="xmap['1'].id" value="443">
<input type="checkbox" name="xmap['2'].id" value="442">
* Action中用Map集合來處理:private Map xmap = new XWorkMap(User.class)
public List getXmap(){
return xmap;
}
III.
<input type="checkbox" name="xarray[0]." value="444">
<input type="checkbox" name="xarray[1]" value="443">
<input type="checkbox" name="xarray[2]" value="442">
*Action中用Object[]數組來處理(注意數組的長度必須事先確定,不可以動態改動數組的大小):
private Object[] xarray = new Object[3]
public Object[] getXarray(){
return xarray;
}
下面用一個稍爲複雜一點的例子來加深對List集合處理方式的理解,其它處理方式都是異曲同工。
multiSelect.jsp文件
<%@page pageEncoding="gb2312" contentType="text/html;charset=gb2312"%>
<%@taglib prefix="ww" uri="webwork" %>
<html>
<body>
<form name="multi" method="post" action="multiSelect.action">
<%int i = 0; %>
<ww:iterator value="ulist">
<%
String cName = "xlist["+i+"].id";
i++;
%>
<input type="checkbox" name="<%=cName%>" value="<ww:property value="id"/>">
<ww:property value="username"/>
<br>
</ww:iterator>
<input type="hidden" name="actionEvent" value="viewSelect">
<input type="submit" value="選擇">
</form>
</body>
</html>
multiSelect_result.jsp文件
<%@page pageEncoding="gb2312" contentType="text/html;charset=gb2312"%>
<%@taglib prefix="ww" uri="webwork" %>
<html>
<body>你的選擇是:<br>
<ww:iterator value="xlist">
<ww:property value="id"/>
<br>
</ww:iterator>
</body>
</html>
MultiSelectAction.java文件
package com.wzj.rbac.webwork.action;
import java.util.List;
import com.opensymphony.xwork.Action;
import com.opensymphony.xwork.util.XWorkList;
import com.wzj.framework.spring.resource.BeanLocator;
import com.wzj.rbac.ServiceFacade.UserService;
import com.wzj.rbac.domain.object.User;
/**
* @desc 複選框 選擇提交Action類
* @author chikai<br>
* @link <a href="chikaimailto:[email protected]">chikai</a>
* @version $ MultiSelectAction.java 2004-12-5 19:11:54 $
* @version $ Project xwork
*/
public class MultiSelectAction implements Action {
private final static String PRE_SUCCESS = "pre_success";
//用戶列表
private List ulist;
//選擇的用戶
private List xlist = new XWorkList(User.class);
private UserService uService;
//頁面執行動作判斷
private String actionEvent;
public String execute() throws Exception {
if(actionEvent!=null&&actionEvent.equals("viewSelect"))
{
for(int s=0;s<xlist.size();s++){
if(((User)xlist.get(s)).getId()==null){
xlist.remove(s);
s--;
}
}
return SUCCESS;
}
//獲取用戶業務服務
uService = BeanLocator.getGlobalServiceLocator().getUserService();
ulist = uService.getAllUser();
return PRE_SUCCESS;
}
public List getUlist(){
return ulist;
}
public List getXlist(){
return xlist;
}
public void setActionEvent(String ae){
actionEvent = ae;
}
}
xwork.xml文件:
<!DOCTYPE xwork PUBLIC "-//OpenSymphony Group//XWork 1.0//EN" "http://www.opensymphony.com/xwork/xwork-1.0.dtd">
<xwork>
<include file="webwork-default.xml" />
<include file="config-browser.xml" />
<package name="pklogin" extends="webwork-default">
<interceptors>
<interceptor-stack name="modelParamsStack">
<interceptor-ref name="model-driven" />
<interceptor-ref name="params" />
</interceptor-stack>
</interceptors>
<action name="multiSelect" class="com.wzj.rbac.webwork.action.MultiSelectAction">
<result name="success" type="dispatcher">
<param name="location">/multiSelect_result.jsp</param>
</result>
<result name="pre_success" type="dispatcher">
<param name="location">/multiSelect.jsp</param>
</result>
<interceptor-ref name="modelParamsStack" />
</action>
</package>
</xwork>