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>