struts2、webwork 循环的使用,实现for功能
在struts2及webwork中要实现如:
for(int i=0;i<10;i++){}
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....
jsp代码
<s:bean id="counter" name="org.apache.struts2.util.Counter"><s:iterator>- <s:bean name="org.apache.struts2.util.Counter" id="counter">
- <s:param name="first" value="1" />
- <s:param name="last" value="10" />
- <s:iterator>
- counter:<s:property/>
- </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!
/* * $Id: Counter.java 471756 2006-11-06 15:01:43Z husted $ * * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ package org.apache.struts2.util; import java.io.Serializable; /** * A bean that can be used to keep track of a counter. * * 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 } }</s:iterator>
</s:bean>
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