jsp通過logic:iterate或html:optionsCollection迴圈顯示action中傳過來的對象List

 

action中代碼如下：<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)

http://www.CodeHighlighter.com/

-->        List allUser=this.getLoginServiceImpl().find();
        request.setAttribute("user", allUser);
        return mapping.findForward("listUser");

註：其中User對象有id和name屬性

jsp顯示：法一<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)

http://www.CodeHighlighter.com/

-->            <html:select property="school">
            <html:option value="">
                <bean:message key="login.select" />
            </html:option>
                <logic:present name="user">
                    <logic:iterate id="user" name="user" offset="0">
                        <option value="<bean:write name="user" property="id" />">
                            <bean:write name="user" property="name" />
                        </option>
                    </logic:iterate>
                </logic:present>
        </html:select>

jsp顯示：法二<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)

http://www.CodeHighlighter.com/

-->       <html:select property="school">
            <html:optionsCollection name="user" value="id" label="name"/>
       </html:select>

optionsCollection標籤用法：
與options標籤一樣，optionsCollection標籤可以從集合或者是包含集合的對象裡獲得選項的標籤/值對。在這兩種情況裡，集合或包含集合的對象必須是一個範圍對象，否則定製標籤將無法訪問它。

1.與包含集合的對象配合使用
舉例：userForm動作表單有一個如下所示的ArrayList類型的userList屬性，相應的set，get方法，通過在action中設定好userForm後，request.setAttribute("userForm",userForm)；
在jsp頁面：<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)

http://www.CodeHighlighter.com/

--><html:select property="school">
<html:optionsCollection name="userForm"
      property="userList"/>
</html:select>

2.與集合配合使用
action中<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)

http://www.CodeHighlighter.com/

-->ArrayList userList=new ArrayList();
userList.add(new LabelValueBean("1","haha"));
userList.add(new LabelValueBean("2","dada"));
userList.add(new LabelValueBean("3","xiaoxiao"));
request.setAttribute("userList",userList);

jsp頁面<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)

http://www.CodeHighlighter.com/

--><html:select property="school">
<html:optionsCollection name="userList"
      label="label" value="value"/>
</html:select>