Struts2标签实现for循环

感悟：但是不建议使用这种方法，按照MVC框架的思想 ，应该把业务更多放在后台。前台尽量只进行数据展示。

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

在struts2及webwork中要实现如：

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

还是需要一些技巧的，我在做分页条的时候，要输出页码，怪了，用迭代器不行的，看了一下struts2的文档及例子也没发现用计数器的地方，偶然看了一下bea标签，哦，原来如此....

<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" />  //循环控制变量
   <s:iterator>
     counter:<s:property/>   //内容
   </s:iterator>
</s:bean>

其中first属性指定循环起始值，last指定循环终止值，其它相关属性可以查看org.apache.struts2.util.Counter类源码。在下面迭代器中输入循环的当前值，即：current

干脆把源码贴出来吧！

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

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

　　}

}

    

//项目中的应用

<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="">删除</a></td>
                    </tr>
      </s:iterator>
</s:bean>