Struts2 DoubleSelect标签的使用
Struts2本身提供了级联下拉选择框标签，这对简化诸如省份/城市这样的典型需求的操作是大有好处的，同时也有利于架构的统一，没有必要引入一大堆的javascript代码，使用方法如下：
1、Action层
DoubleListAction.java
package com.mobilesoft.esales.webapp.action;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.apache.log4j.Logger;
import com.mobilesoft.framework.tree.model.FileWrapper;
import com.mobilesoft.framework.tree.model.OssCategory;
import com.mobilesoft.framework.tree.service.TreeService;
public class DoubleListAction extends BaseAction {
/**
* Logger for this class
*/
private static final Logger logger = Logger.getLogger(DoubleListAction.class);
public String execute() {
Map map=new HashMap();
ArrayList list1=new ArrayList();
list1.add("11");
list1.add("12");
list1.add("13");
map.put("1", list1);
ArrayList list2=new ArrayList();
list2.add("21");
list2.add("22");
list2.add("23");
map.put("2", list2);
ArrayList list3=new ArrayList();
list3.add("31");
list3.add("32");
list3.add("33");
map.put("3", list3);
getRequest().setAttribute("map", map);
return SUCCESS;
}
public String doubleSelectTest(){
Map map=new HashMap();
ArrayList list1=new ArrayList();
list1.add("11");
list1.add("12");
list1.add("13");
map.put("1", list1);
ArrayList list2=new ArrayList();
list2.add("21");
list2.add("22");
list2.add("23");
map.put("2", list2);
ArrayList list3=new ArrayList();
list3.add("31");
list3.add("32");
list3.add("33");
map.put("3", list3);
getRequest().setAttribute("map", map);
return SUCCESS;
}
public String doubleSelectPost(){
Map map=getRequest().getParameterMap();
Set set=map.entrySet();
Iterator iterator=set.iterator();
while(iterator.hasNext()){
Map.Entry mapEntry=(Map.Entry)iterator.next();
logger.fatal("The key is: "+mapEntry.getKey()+",value is :"+mapEntry.getValue());
}
getRequest().setAttribute("map", map);
return SUCCESS;
}
}2、页面
doubleslect.jsp
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ page language="java" errorPage="/error.jsp" pageEncoding="GBK" contentType="text/html;charset=GBK" %>
<html>
<head>
<title>Struts 2 Cool Tags - <s:doubeselect/ ></title>
<s:head />
</head>
<body>
<h2>Doubleselect Tag Example</h2>
<s:form action="doubleSelectPost" name="form1">
Doubleselect演示1
<s:set name="technology"
value="#{
'Java': {'Spring', 'Hibernate', 'Struts 2'},
'.Net': {'Linq', ' ASP.NET 2.0'},
'Database': {'Oracle', 'SQL Server', 'DB2', 'MySQL'}
}" />
<s:doubleselect label="技术选择"
list="#technology.keySet()"
name="doubleselect1"
doubleName="techdetail"
formName="form1"
doubleList="#technology[top]" />
<br/><br/>
Doubleselect演示数据演示2：
<s:set name="mymap" value="#request.map"/>
<s:doubleselect list="#request.map.keySet()"
doubleName="mymap1"
name="doubleselect2"
formName="form1"
doubleList="#request.map[top]"
label="Map Test" />
<s:submit/>
</s:form>
</body>
</html>doubleselectpost.jsp
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ page language="java" errorPage="/error.jsp" pageEncoding="GBK" contentType="text/html;charset=GBK" %>
<html>
<head>
<title>Struts 2 Cool Tags - <s:doubeselect/ ></title>
<s:head />
</head>
<body>
<h2>Doubleselect Tag Example</h2>
<s:form name="form1">
<table border="0" cellspacing="0" cellpadding="1">
<tr>
<th>参数值</th>
</tr>
<s:iterator value="#request.map.keySet()" status="keys">
<tr>
<td><s:property/></td>
</tr>
</s:iterator>
</s:form>
</body>
</html>3、struts.xml配置文件
<action name="doubleSelectTest" method="doubleSelectTest" class="com.mobilesoft.esales.webapp.action.DoubleListAction">
<result name="success">test/doubleselect.jsp</result>
</action>
<action name="doubleSelectPost" method="doubleSelectPost" class="com.mobilesoft.esales.webapp.action.DoubleListAction">
<result name="success">test/doubleselectpost.jsp</result>
</action>4、级联下拉框间的换行<br >问题
缺省情况下，两个级联下拉框间是换行的，Struts2采用Freemarker来做模板，可以通过修改模板来定制标签缺省的树形。参看“Struts2中Datetimepicker控件的中文问题”中的方法，也即：
◦修改struts.mxl，增加如下内容。
<constant name=”struts.serve.static” value=”false” />
<constant name=”struts.ui.templateDir” value=”struts” />
注意在struts2-core-2.0.11.jar/org/apache/struts2/default.properties中有几个与Freemarker对应的配置参数：
struts.ui.theme=xhtml
struts.ui.templateDir=template
#sets the default template type. Either ftl, vm, or jsp
struts.ui.templateSuffix=ftl
◦覆盖缺省的静态文件
在resource目录（与WEB-INF同级或WEB-INF下）创建struts目录,并：
解压struts2-core-2.0.11.jar:/org/apache/struts2/static/ to /struts/
解压struts2-core-2.0.11.jar:/template/simple/ to /struts/simple/
解压struts2-core-2.0.11.jar:/template/xhtml/ to /struts/xhtml/
解压struts2-core-2.0.11.jar:/template/css_xhtml/ to /struts/css_xhtml/
解压struts2-core-2.0.11.jar:/template/ajax/ to /struts/ajax/
解压struts2-core-2.0.11.jar:/template/archive/ to /struts/archive
最后的目录结构如下：
struts/
- ajax/
- archive/
- css_xhtml/
- dojo/
- nls/
- src/
- animation/
- …
- xml/
- struts/
- widget/
- widgets/
- niftycorners/
- simple/
- xhtml/
◦修改doubleselect的模板doubleselect.ftl
修改struts/simple/doubleselect.ftl去除其中的<br />
1、Action层
DoubleListAction.java
package com.mobilesoft.esales.webapp.action;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.apache.log4j.Logger;
import com.mobilesoft.framework.tree.model.FileWrapper;
import com.mobilesoft.framework.tree.model.OssCategory;
import com.mobilesoft.framework.tree.service.TreeService;
public class DoubleListAction extends BaseAction {
/**
* Logger for this class
*/
private static final Logger logger = Logger.getLogger(DoubleListAction.class);
public String execute() {
Map map=new HashMap();
ArrayList list1=new ArrayList();
list1.add("11");
list1.add("12");
list1.add("13");
map.put("1", list1);
ArrayList list2=new ArrayList();
list2.add("21");
list2.add("22");
list2.add("23");
map.put("2", list2);
ArrayList list3=new ArrayList();
list3.add("31");
list3.add("32");
list3.add("33");
map.put("3", list3);
getRequest().setAttribute("map", map);
return SUCCESS;
}
public String doubleSelectTest(){
Map map=new HashMap();
ArrayList list1=new ArrayList();
list1.add("11");
list1.add("12");
list1.add("13");
map.put("1", list1);
ArrayList list2=new ArrayList();
list2.add("21");
list2.add("22");
list2.add("23");
map.put("2", list2);
ArrayList list3=new ArrayList();
list3.add("31");
list3.add("32");
list3.add("33");
map.put("3", list3);
getRequest().setAttribute("map", map);
return SUCCESS;
}
public String doubleSelectPost(){
Map map=getRequest().getParameterMap();
Set set=map.entrySet();
Iterator iterator=set.iterator();
while(iterator.hasNext()){
Map.Entry mapEntry=(Map.Entry)iterator.next();
logger.fatal("The key is: "+mapEntry.getKey()+",value is :"+mapEntry.getValue());
}
getRequest().setAttribute("map", map);
return SUCCESS;
}
}2、页面
doubleslect.jsp
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ page language="java" errorPage="/error.jsp" pageEncoding="GBK" contentType="text/html;charset=GBK" %>
<html>
<head>
<title>Struts 2 Cool Tags - <s:doubeselect/ ></title>
<s:head />
</head>
<body>
<h2>Doubleselect Tag Example</h2>
<s:form action="doubleSelectPost" name="form1">
Doubleselect演示1
<s:set name="technology"
value="#{
'Java': {'Spring', 'Hibernate', 'Struts 2'},
'.Net': {'Linq', ' ASP.NET 2.0'},
'Database': {'Oracle', 'SQL Server', 'DB2', 'MySQL'}
}" />
<s:doubleselect label="技术选择"
list="#technology.keySet()"
name="doubleselect1"
doubleName="techdetail"
formName="form1"
doubleList="#technology[top]" />
<br/><br/>
Doubleselect演示数据演示2：
<s:set name="mymap" value="#request.map"/>
<s:doubleselect list="#request.map.keySet()"
doubleName="mymap1"
name="doubleselect2"
formName="form1"
doubleList="#request.map[top]"
label="Map Test" />
<s:submit/>
</s:form>
</body>
</html>doubleselectpost.jsp
<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ page language="java" errorPage="/error.jsp" pageEncoding="GBK" contentType="text/html;charset=GBK" %>
<html>
<head>
<title>Struts 2 Cool Tags - <s:doubeselect/ ></title>
<s:head />
</head>
<body>
<h2>Doubleselect Tag Example</h2>
<s:form name="form1">
<table border="0" cellspacing="0" cellpadding="1">
<tr>
<th>参数值</th>
</tr>
<s:iterator value="#request.map.keySet()" status="keys">
<tr>
<td><s:property/></td>
</tr>
</s:iterator>
</s:form>
</body>
</html>3、struts.xml配置文件
<action name="doubleSelectTest" method="doubleSelectTest" class="com.mobilesoft.esales.webapp.action.DoubleListAction">
<result name="success">test/doubleselect.jsp</result>
</action>
<action name="doubleSelectPost" method="doubleSelectPost" class="com.mobilesoft.esales.webapp.action.DoubleListAction">
<result name="success">test/doubleselectpost.jsp</result>
</action>4、级联下拉框间的换行<br >问题
缺省情况下，两个级联下拉框间是换行的，Struts2采用Freemarker来做模板，可以通过修改模板来定制标签缺省的树形。参看“Struts2中Datetimepicker控件的中文问题”中的方法，也即：
◦修改struts.mxl，增加如下内容。
<constant name=”struts.serve.static” value=”false” />
<constant name=”struts.ui.templateDir” value=”struts” />
注意在struts2-core-2.0.11.jar/org/apache/struts2/default.properties中有几个与Freemarker对应的配置参数：
struts.ui.theme=xhtml
struts.ui.templateDir=template
#sets the default template type. Either ftl, vm, or jsp
struts.ui.templateSuffix=ftl
◦覆盖缺省的静态文件
在resource目录（与WEB-INF同级或WEB-INF下）创建struts目录,并：
解压struts2-core-2.0.11.jar:/org/apache/struts2/static/ to /struts/
解压struts2-core-2.0.11.jar:/template/simple/ to /struts/simple/
解压struts2-core-2.0.11.jar:/template/xhtml/ to /struts/xhtml/
解压struts2-core-2.0.11.jar:/template/css_xhtml/ to /struts/css_xhtml/
解压struts2-core-2.0.11.jar:/template/ajax/ to /struts/ajax/
解压struts2-core-2.0.11.jar:/template/archive/ to /struts/archive
最后的目录结构如下：
struts/
- ajax/
- archive/
- css_xhtml/
- dojo/
- nls/
- src/
- animation/
- …
- xml/
- struts/
- widget/
- widgets/
- niftycorners/
- simple/
- xhtml/
◦修改doubleselect的模板doubleselect.ftl
修改struts/simple/doubleselect.ftl去除其中的<br />