package com.yiibai.common.action;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.opensymphony.xwork2.ActionSupport;
 
public class MergeTagAction extends ActionSupport{
 
	private List<String> list1 = new ArrayList<String>();
	private List<String> list2 = new ArrayList<String>();
	private List<String> list3 = new ArrayList<String>();

	private Map<String,String> map1 = new HashMap<String,String>();
	private Map<String,String> map2 = new HashMap<String,String>();
	private Map<String,String> map3 = new HashMap<String,String>();
	
	public String execute() {
		
		list1.add("List1 - 1");
		list1.add("List1 - 2");
		list1.add("List1 - 3");
		
		list2.add("List2 - 1");
		list2.add("List2 - 2");
		list2.add("List2 - 3");
		
		list3.add("List3 - 1");
		list3.add("List3 - 2");
		list3.add("List3 - 3");
		
		map1.put("map1-key1", "map1-value1");
		map1.put("map1-key2", "map1-value2");
		map1.put("map1-key3", "map1-value3");
		
		map2.put("map2-key1", "map2-value1");
		map2.put("map2-key2", "map2-value2");
		map2.put("map2-key3", "map2-value3");
		
		map3.put("map3-key1", "map3-value1");
		map3.put("map3-key2", "map3-value2");
		map3.put("map3-key3", "map3-value3");
		
		return SUCCESS;
	}

	//getter methods...
}

2. Merge 標(biāo)簽示例

JSP頁面使用merge標(biāo)記為3個ArrayList/3個HashMap/1個ArrayList+1個HashMap合并成一個迭代器，循環(huán)它的值，并把打印出來。

merge.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>
 <html>
<head><title>Generator 標(biāo)簽示例 -  www.yiibai.com</title> </head>
 
<body>
<h1>Struts 2 Merge tag example</h1>

1. Merge 3 ArrayList into a single iterator.
<s:merge var="customListIterator">
     <s:param value="%{list1}" />
     <s:param value="%{list2}" />
     <s:param value="%{list3}" />
</s:merge>
<ol>
<s:iterator value="%{#customListIterator}">
     <li><s:property /></li>
</s:iterator>
</ol>

2. Merge 3 HashMap into a single iterator.
<s:merge var="customMapIterator">
     <s:param value="%{map1}" />
     <s:param value="%{map2}" />
     <s:param value="%{map3}" />
</s:merge>
<ol>
<s:iterator value="%{#customMapIterator}">
     <li><s:property /></li>
</s:iterator>
</ol>

3. Merge ArrayList and HashMap into a single iterator.
<s:merge var="customMixedIterator">
     <s:param value="%{list1}" />
     <s:param value="%{map1}" />
</s:merge>
<ol>
<s:iterator value="%{#customMixedIterator}">
     <li><s:property /></li>
</s:iterator>
</ol>

</body>
</html>

3. struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
 
<struts>

 	<constant name="struts.devMode" value="true" />
	
	<package name="default" namespace="/" extends="struts-default">
	
		<action name="mergeTagAction" 
			class="com.yiibai.common.action.MergeTagAction" >
			<result name="success">pages/merge.jsp</result>
		</action>
		
	</package>
		
</struts>

4. 示例

http://localhost:8080/struts2mergetag/mergeTagAction.action

在瀏覽器打開上面的網(wǎng)址，輸出以下結(jié)果：

Struts 2 Merge tag example

1. Merge 3 ArrayList into a single iterator.

  1. List1 - 1
  2. List2 - 1
  3. List3 - 1
  4. List1 - 2
  5. List2 - 2
  6. List3 - 2
  7. List1 - 3
  8. List2 - 3
  9. List3 - 3

2. Merge 3 HashMap into a single iterator.

  1. map1-key3=map1-value3
  2. map2-key2=map2-value2
  3. map3-key3=map3-value3
  4. map1-key1=map1-value1
  5. map2-key3=map2-value3
  6. map3-key1=map3-value1
  7. map1-key2=map1-value2
  8. map2-key1=map2-value1
  9. map3-key2=map3-value2

3. Merge ArrayList and HashMap into a single iterator.

  1. List1 - 1
  2. map1-key3=map1-value3
  3. List1 - 2
  4. map1-key1=map1-value1
  5. List1 - 3
  6. map1-key2=map1-value2

參考

Struts 2 Merge 標(biāo)簽文檔

代碼下載 - http://pan.baidu.com/s/1c0dnNcW

上一篇：Struts2 + Hibernate使用“Full Hibernate Plugin"插件集成下一篇：Struts2 值棧/OGNL

Struts2 &lt;s:merge&gt;標(biāo)簽示例

1. 動作

2. Merge 標(biāo)簽示例

3. struts.xml

4. 示例

參考

Struts2 <s:merge>標(biāo)簽示例