Flex 动态加载树 (测试)

最新推荐文章于 2025-05-15 08:56:35 发布

wendred

最新推荐文章于 2025-05-15 08:56:35 发布

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文章标签： Flex Java JDBC DAO XML

本文介绍了一个使用Flex和BlazeDS实现的动态加载树形结构的例子。通过RemoteObject调用后端服务获取节点数据，并根据数据动态更新树结构。具体展示了mxml文件的编写方式以及Java后端服务的实现。

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最近在看Flex,用RemoteObject方法(Blazeds)做了个动态加载树的小例子,不是很好,以后再慢慢改进吧.
mxml文件如下：


<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
	<mx:Script >
 	<![CDATA[
 		import mx.events.ListEvent;
 		import mx.events.TreeEvent;
 	        import mx.controls.Alert;
 	        import mx.rpc.events.ResultEvent;
 		import mx.collections.ArrayCollection;
 		import mx.collections.XMLListCollection;
 	         private var _node:XML;

 		  [Bindable]
 		  private var xmlTree:XML = <node nodename="root" id="0" is_parent="1" parentnode="" action="">
 		  <nodetemp nodename="" id="" is_parent="" parentnode="" action=""></nodetemp>
 		  </node>;

 		private function   addNewNode(treenode:XML,resultList:ArrayCollection):void{
 			if(null==resultList){
 				return ;
 			}
 			 for(var i:Number=0;i<resultList.length;i++){
 			 	  var newNode:XML = <node/>;
 			 	   newNode.@id=resultList[i]["node"];
 			 	   newNode.@is_parent=resultList[i]["is_parent"];
 			 	   newNode.@nodename=resultList[i]["nodename"];
 			 	   newNode.@parentnode=resultList[i]["parentnode"];
 			 	   newNode.@action=resultList[i]["action"];
 			 	   right_tree.dataDescriptor.addChildAt(treenode, newNode, i, treenode);
 			//如果有子节点就创建临时节点,让这个节点有itemOpen的方法	  
                   if("1"==resultList[i]["is_parent"]){
                      	var nodetemp:XML = <nodetemp/>;
 	               	    right_tree.dataDescriptor.addChildAt(newNode, nodetemp, 0, newNode);
 	               }
 			 }	  
 		}

         private  function getRightByParntResult(event:ResultEvent):void{
           	  var resultList:ArrayCollection =event.result as ArrayCollection;
 			  addNewNode(_node,resultList);
           }

         private function tree_itemOpen(evt:TreeEvent):void {
                 var t:Tree = evt.currentTarget as Tree;           
                 _node= evt.itemRenderer.data as XML;
                 var hasload:Boolean = false;
                 var xmllist:XMLList = _node.elements("nodetemp");
                //删除拥有子节点的临时节点
 			     if(null != xmllist && xmllist.length() >0 ){
 			     	for(var i:Number=0;i<xmllist.length();i++){
 			     	var temp:XML = xmllist[i] as XML
 			     		 right_tree.dataDescriptor.removeChildAt(_node,temp,i,_node);	
 			     	}
 			     }
 			      xmllist  =_node.elements("node");
                             //如果这个节点已经取过子节点就返回，不需要再取
 			      if(null!=xmllist&&xmllist.length()>0){  
 			    	return;
 			      }
                  rightHandler.endpoint="messagebroker/amf";
                  var nodeid:String=_node.@id ;
 			      rightHandler.getRightByParent(nodeid);
          }   

 	]]>
 </mx:Script>

	<mx:RemoteObject id="rightHandler" destination="rightHandler"  >
	     <mx:method  name="getRightByParent"  result="getRightByParntResult(event)" />
	</mx:RemoteObject>

	     <mx:Tree id="right_tree" 
	     dataProvider="{xmlTree}" 
	     itemOpen="tree_itemOpen(event)"
	     labelField="@nodename"
	     bottom="0" top="25" right="0" left="0">
	     </mx:Tree>
</mx:Application>

Java代码


package com.cpk.service;

import java.util.List;
import java.util.Map;

import com.cpk.dao.RightDao;
public class RightHandler {

	 public List<Map<String,String>> getRightByParent(String parentID){
		 RightDao dao=new RightDao();
        return dao.query(parentID);

	 }

}


package com.cpk.dao;

import java.util.List;
import java.util.Map;

import com.caipk.newjdbc.sql.Finder;
import com.caipk.newjdbc.template.Jdbc;

public class RightDao extends Jdbc {

  public List<Map<String,String>> query(String parentid){		
	return this.query(
		Finder.create("select node,parentnode,nodename,action,title,closeimg,openimg,")
		.append(" decode( (select node from right t where node in(select distinct parentnode from right  where status='0') and t.node=right.node and  parentnode=?),null,'0','1') as is_parent ")
		.append(" from right")
		.append(" where parentnode=?")
		.setParam(parentid)
		.setParam(parentid)
		);
  }

}

remoting-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<service id="remoting-service" 
    class="flex.messaging.services.RemotingService">

    <adapters>
        <adapter-definition id="java-object" class="flex.messaging.services.remoting.adapters.JavaAdapter" default="true"/>
    </adapters>

    <default-channels>
        <channel ref="my-amf"/>
    </default-channels>
 <!--  
    <destination id="GenericDestination">
        <properties>
            <source>*</source>
        </properties>
    </destination>
   -->
    <destination id="EmployeeHandler">
        <properties>
            <source>com.cpk.service.EmployeeHandler</source>
        </properties>
    </destination>

     <destination id="rightHandler">
        <properties>
            <source>com.cpk.service.RightHandler</source>
        </properties>
    </destination>


</service>