struts与flex通过xml交互模型

struts与flex通过xml交互模型

示例代码下载： flex-struts.rar
该代码包含两个项目，一个是web项目，一个是flex项目，使用workshop+flex builder2开发，主要演示了如下几个特征：
(1).flex获取远程url的xml数据，加载到DataGrid中。在解释数据的时候，使用了actionscript的class.
actionscript class文件代码：

  package org.c2ome.flex.xml
{ 
 public class XmlDoc
 {
  private var headStr :String = 
   "<?xml version='1.0' ?>" + 
   "<Msg>" + 
   "<data>";
  private var footStr: String =
   "</data>" + 
   "</Msg>";
  private var contentStr: String = "";

  public function addData(key : String, value: String) : void {
   var nodeStr: String = 
    "<entry><key>" + key + "</key><value>" + value +"</value>" + "</entry>";
   contentStr +=nodeStr;
  }
  public function toXml() : XML {
   return new XML(headStr + contentStr + footStr);
  }
  public function toString() :String {
   return headStr + contentStr + footStr;
  } 
 }
}

flexj.mxml代码：

<? xml version="1.0" encoding="utf-8" ?>
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"  layout ="absolute" >
  < mx:Script >
   <![CDATA[
  import org.c2ome.flex.xml.XmlDoc;
  import mx.rpc.events.ResultEvent;
  import mx.controls.Alert;
  import flash.events.Event;
  import flash.net.URLLoader;
  import flash.net.URLRequest;
        private function loadApp():void {
   var loader:URLLoader = new URLLoader();
   var request:URLRequest = new URLRequest("http://localhost:8080/flexLogic.do?method=getBooks");
   var variables:URLVariables = new URLVariables();
   var x : XmlDoc = new XmlDoc();
   x.addData("name","c2one");
   x.addData("password","123456");
   variables.xmlDoc = x.toString();
   request.data = variables;
   request.method = "POST";
   loader.load(request);
   loader.addEventListener(Event.COMPLETE, onComplete);
        }
  private function onComplete(event:Event):void
  {
      var loader:URLLoader = event.target as URLLoader;
      if (loader != null) {
          var externalXML:XML = new XML(loader.data);
          bookdg.dataProvider = externalXML.data.entry.(key=="cc").value.Book;
       sysReturn.text = externalXML.data.entry.(key=="name").value.valueOf();
      }
      else {
          Alert.show("loader is not a URLLoader!");
      }
  }
   ]]>
  </ mx:Script >
  < mx:DataGrid  x ="78.5"  y ="93"  id ="bookdg" >
   < mx:columns >
    < mx:DataGridColumn  headerText ="name"  dataField ="@name" />
    < mx:DataGridColumn  headerText ="price"  dataField ="@price" />
   </ mx:columns >
  </ mx:DataGrid >
  < mx:Button  x ="78.5"  y ="292"  label ="Button"  click ="loadApp();" />
  < mx:TextArea  x ="78"  y ="256"  height ="28"  width ="202.5"  id ="sysReturn" />
</ mx:Application >

(2).在web端根目录配置跨域访问控制：建文件crossdomain.xml

<? xml version="1.0" ?>  
<! DOCTYPE cross-domain-policy
SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd" >
< cross-domain-policy >
     < allow-access-from  domain ="*"   />
</ cross-domain-policy >

(3).在web端使用了betwixt来处理xml与对象，看com.c2one.util.XMLUtil

package  com.c2one.util;

import  java.beans.IntrospectionException;
import  java.io.IOException;
import  java.io.StringReader;
import  java.io.StringWriter;
import  java.util.Map;

import  org.apache.commons.betwixt.io.BeanReader;
import  org.apache.commons.betwixt.io.BeanWriter;
import  org.xml.sax.SAXException;

public   class  XMLUtil  {

    public static String beanParser(String info, String exeCode,
            Map<String, Object> data) throws IOException, SAXException,
            IntrospectionException {
        String result = "";
        StringWriter outputWriter = new StringWriter();
        outputWriter.write("<?xml version='1.0' ?>");
        BeanWriter beanWriter = new BeanWriter(outputWriter);
        beanWriter.getXMLIntrospector().getConfiguration()
                .setAttributesForPrimitives(true);
        beanWriter.getBindingConfiguration().setMapIDs(false);
        beanWriter.enablePrettyPrint();
        ResponseEntity entity = new ResponseEntity(info, exeCode, data);
        beanWriter.write("Msg", entity);
        result = outputWriter.toString();
        outputWriter.close();
        return result;
    }

    public static RequestEntity stringParser(String str)
            throws IntrospectionException, IOException, SAXException {
        StringReader xmlReader = new StringReader(str);
        BeanReader beanReader = new BeanReader();
        beanReader.getXMLIntrospector().getConfiguration()
                .setAttributesForPrimitives(true);
        beanReader.getBindingConfiguration().setMapIDs(false);
        beanReader.registerBeanClass("Msg", RequestEntity.class);
        RequestEntity obj = (RequestEntity) beanReader.parse(xmlReader);
        return obj;
    }
}