Struts2標簽實現for循環

感悟：但是不建議使用這種方法，按照MVC框架的思想 ，應該把業務更多放在后台。前台盡量只進行數據展示。

 

轉自：http://blog.csdn.net/guandajian/article/details/7334756

 

在struts2及webwork中要實現如：

for(int i=0;i<10;i++){
       //內容  
}

 

還是需要一些技巧的，我在做分頁條的時候，要輸出頁碼，怪了，用迭代器不行的，看了一下struts2的文檔及例子也沒發現用計數器的地方，偶然看了一下bea標簽，哦，原來如此....

<s:bean name="org.apache.struts2.util.Counter" id="counter">
   <s:param name="first" value="1" />  //起始值
   <s:param name="last" value="10" />  //循環控制變量
   <s:iterator>
     counter:<s:property/>   //內容
   </s:iterator>
</s:bean>

 

其中first屬性指定循環起始值，last指定循環終止值，其它相關屬性可以查看org.apache.struts2.util.Counter類源碼。在下面迭代器中輸入循環的當前值，即：current

干脆把源碼貼出來吧！

-----------------------------------------------------------------------------------------------------------------------------

package org.apache.struts2.util;

import java.io.Serializable;


/**
* A bean that can be used to keep track of a counter.
* <p/>
* Since it is an Iterator it can be used by the iterator tag
*
*/
public class Counter implements java.util.Iterator, Serializable {

     private static final long serialVersionUID = 2796965884308060179L;

     boolean wrap = false;

     // Attributes ----------------------------------------------------
     long first = 1;
     long current = first;
     long interval = 1;
     long last = -1;


     public void setAdd(long addition) {
         current += addition;
     }

     public void setCurrent(long current) {
         this.current = current;
     }

     public long getCurrent() {
         return current;
     }

     public void setFirst(long first) {
         this.first = first;
         current = first;
     }

     public long getFirst() {
         return first;
     }

     public void setInterval(long interval) {
         this.interval = interval;
     }

     public long getInterval() {
         return interval;
     }

     public void setLast(long last) {
         this.last = last;
     }

     public long getLast() {
         return last;
     }

     // Public --------------------------------------------------------
     public long getNext() {
         long next = current;
         current += interval;

         if (wrap && (current > last)) {
             current -= ((1 + last) - first);
         }

         return next;
     }

     public long getPrevious() {
         current -= interval;

         if (wrap && (current < first)) {
             current += (last - first + 1);
         }

         return current;
     }

     public void setWrap(boolean wrap) {
         this.wrap = wrap;
     }

     public boolean isWrap() {
         return wrap;
     }

     public boolean hasNext() {
         return ((last == -1) || wrap) ? true : (current <= last);
     }

     public Object next() {
         return new Long(getNext());
     }

     public void remove() {
         // Do nothing

　　}

}

 

    

 

//項目中的應用

<s:bean name="org.apache.struts2.util.Counter" id="counter">
      <s:param name="first" value="1" />
      <s:param name="last" value="#request.num" />
      <s:iterator>
                    <tr bgcolor="ffffff" align="center">
                        <td>${rs.f_courseId}&nbsp;</td>
                        <td>${rs.f_coursename}&nbsp;</td>
                        <td>${rs.f_term}&nbsp;</td>
                        <td>${rs.f_week}&nbsp;</td>
                        <td>${rs.f_credit}&nbsp;</td>
                        <td>${rs.f_courseStart}&nbsp;</td>
                        <td>${rs.f_courseEnd}&nbsp;</td>
                        <td><a href="">查看</a> <a href="">刪除</a></td>
                    </tr>
      </s:iterator>
</s:bean>