struts2.0标签应用–for循环的实现

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Java代码

								
										<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 value="current-1"/>
								  </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-1

Counter类源码

								
										/*
								
										 * $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.
								
										 * <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
								    }
								}