Flex's HTTPService与JAVA 数据交互实例

Flex(XML格式): 

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">

<mx:Script>
<![CDATA[
import mx.rpc.events.ResultEvent;
import mx.rpc.events.FaultEvent;
import mx.controls.Alert;

        public function handleXML(event:ResultEvent):void
            {
                shippingInfo = event.result.option as XML;
            }

        public function handleFault(event:FaultEvent):void
        {
           Alert.show(event.fault.faultString, "Error");
        }
]]>
</mx:Script>

    <mx:HTTPService result="handleXML(event);" fault="handleFault(event);" id="xmlRPC" resultFormat="e4x"
    method="POST"  url="http://yourserver.com/xml/xmlHttpService.jsp" useProxy="false">
    <mx:request xmlns="">
        <zipcode>{zipcode.text}</zipcode>
        <pounds>{weight_lb.text}</pounds>
    </mx:request>
</mx:HTTPService>

<mx:Label x="56" y="32" text="Zip Code" width="55" height="18" textAlign="right" fontWeight="bold"/>
<mx:Label x="56" y="58" text="Weight" width="55" height="18" textAlign="right" fontWeight="bold"/>
<mx:TextInput x="130" y="32" id="zipcode" width="160" height="22"/>
<mx:TextInput x="130" y="58" id="weight_lb" width="160" height="22"/>
<mx:Button x="130" y="95" label="Get Shipping Options" click="xmlRPC.send();" width="160" height="22"/>
<mx:DataGrid
dataProvider="{shippingInfo}"
x="80" y="141" width="262" height="92" id="shippingOptionsList" editable="false" enabled="true">
    <mx:columns>
        <mx:DataGridColumn headerText="Service" dataField="service" />
        <mx:DataGridColumn headerText="Price" dataField="price" />
    </mx:columns>
</mx:DataGrid>

</mx:Application>
-------------------------------------------
JAVA代码
xmlHttpService.JSP

<%@page import="quickstart.ShippingCalculator,
                quickstart.ShippingOption,
                java.util.List" %>

<?xml version="1.0" encoding="utf-8"?>
<options>
<%
    ShippingCalculator calc = new ShippingCalculator();
    List    options;
    int     zipcode;
    double  pounds;

    zipcode = Integer.parseInt(request.getParameter("zipcode"));
    pounds = Double.parseDouble(request.getParameter("pounds"));

    options = calc.getShippingOptions(zipcode, pounds);

    for (int i = 0; i < options.size(); i++) {
        ShippingOption option = (ShippingOption) options.get(i);
%>
    <option>
        <service><%= option.getService() %></service>
        <price><%= option.getPrice() %></price>
    </option>
<%
    }
%>
</options>
ShippingCalculator.java

package quickstart;

import java.util.ArrayList;
import java.util.List;
import java.lang.Math;

public class ShippingCalculator {

    /*  Returns a list of made-up ShippingOptions.
    */
    public List getShippingOptions(int zipcode, double pounds) {

        List        options = new ArrayList();
        double      baseCost;

        baseCost = Math.round(zipcode / 10000) + (pounds * 5);

        options.add(new ShippingOption("Next Day", baseCost * 4));
        options.add(new ShippingOption("Two Day Air", baseCost * 2));
        options.add(new ShippingOption("Saver Ground", baseCost));

        return options;
    }
}
ShippingOption.java

package quickstart;

public class ShippingOption {

    private String  service;
    private double  price;

    public ShippingOption() {
    }

    public ShippingOption(String aService, double aPrice) {
        this.service = aService;
        this.price = aPrice;
    }

    public void setService(String value) {
        this.service = value;
    }

    public void setPrice(double value) {
        this.price = value;
    }

    public String getService() { return this.service; }

    public double getPrice() { return this.price; }
}
------------------------------------------

代码是在网上看到的，以前总是很纳闷儿Flex到底怎么和其他语言交互的，看了这段代码总算明白了，简单的说，也就是
后台语言先把要显示的数据用XML的形式表示出来，然后Flex再利用TTPService组件读取这个XML

，这样就达到了语言互通的作用，可能我的理解有点浅显，还望高手赐教