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:
1 for(int i=0;i<10;i++){ 2 //内容 3 }
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....
1 <s:bean name="org.apache.struts2.util.Counter" id="counter"> 2 <s:param name="first" value="1" /> //起始值 3 <s:param name="last" value="10" /> //循环控制变量 4 <s:iterator> 5 counter:<s:property/> //内容 6 </s:iterator> 7 </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!
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1 package org.apache.struts2.util; 2 3 import java.io.Serializable; 4 5 6 /** 7 * A bean that can be used to keep track of a counter. 8 * <p/> 9 * Since it is an Iterator it can be used by the iterator tag 10 * 11 */ 12 public class Counter implements java.util.Iterator, Serializable { 13 14 private static final long serialVersionUID = 2796965884308060179L; 15 16 boolean wrap = false; 17 18 // Attributes ---------------------------------------------------- 19 long first = 1; 20 long current = first; 21 long interval = 1; 22 long last = -1; 23 24 25 public void setAdd(long addition) { 26 current += addition; 27 } 28 29 public void setCurrent(long current) { 30 this.current = current; 31 } 32 33 public long getCurrent() { 34 return current; 35 } 36 37 public void setFirst(long first) { 38 this.first = first; 39 current = first; 40 } 41 42 public long getFirst() { 43 return first; 44 } 45 46 public void setInterval(long interval) { 47 this.interval = interval; 48 } 49 50 public long getInterval() { 51 return interval; 52 } 53 54 public void setLast(long last) { 55 this.last = last; 56 } 57 58 public long getLast() { 59 return last; 60 } 61 62 // Public -------------------------------------------------------- 63 public long getNext() { 64 long next = current; 65 current += interval; 66 67 if (wrap && (current > last)) { 68 current -= ((1 + last) - first); 69 } 70 71 return next; 72 } 73 74 public long getPrevious() { 75 current -= interval; 76 77 if (wrap && (current < first)) { 78 current += (last - first + 1); 79 } 80 81 return current; 82 } 83 84 public void setWrap(boolean wrap) { 85 this.wrap = wrap; 86 } 87 88 public boolean isWrap() { 89 return wrap; 90 } 91 92 public boolean hasNext() { 93 return ((last == -1) || wrap) ? true : (current <= last); 94 } 95 96 public Object next() { 97 return new Long(getNext()); 98 } 99 100 public void remove() { 101 // Do nothing 102 103 } 104 105 }
//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>${rs.f_courseId} </td> <td>${rs.f_coursename} </td> <td>${rs.f_term} </td> <td>${rs.f_week} </td> <td>${rs.f_credit} </td> <td>${rs.f_courseStart} </td> <td>${rs.f_courseEnd} </td> <td><a href="">查看</a> <a href="">删除</a></td> </tr> </s:iterator> </s:bean>