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The last thing you need to do before using XmlRpcServlet is to configure it in web.xml. Add the following entries to the file:
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<servlet> <servlet-name>XmlRpcServlet</servlet-name> <servlet-class>org.apache.xmlrpc. webserver.XmlRpcServlet</servlet-class> <init-param> <param-name>enabledForExtensions</param-name> <param-value>true</param-value> <description> Sets, whether the servlet supports vendor extensions for XML-RPC. </description> </init-param> </servlet> <servlet-mapping> <servlet-name>XmlRpcServlet</servlet-name> <url-pattern>/xmlrpc</url-pattern>
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</servlet-mapping>
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The XML-RPC server is now http://127.0.0.1:8080/xmlrpc.
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endpoint:
The assumption is that the server is running locally and Tomcat is listening for HTTP on port 8080. Next, you do the following:
1. Create a client application able to communicate over XML-RPC. 2. Make the Flex client and the Java server talk to each other over XML-RPC.
To create the Flex client, the idea is again to avoid reinventing the wheel. So an obvious choice is to use an existing open source library such as as3-rpclib (http://code.google.com/p/as3-rpclib/), which seems the most robust open source library achieving this functionality for Flex (although at the time of writing it still claims to be in beta). The library implements HTTPService-based support for RPC over AMF0 (binary original AMF format), XML-RPC, and JSON-RPC (which is discussed next). The first step is to download the library and get the SWC file. Next, as with any Flex application (with Flex Builder), you create a Flex project and go with the defaults Then you add the as3-rpclib.swc file to the library path as shown in Figure 7-9.
Figure 7-9. Adding as3-rpclib.swc to the Flex project library path
When all of the setup is done, you create the Flex application code that uses XML-RPC to communicate with the server you created a short while back. The server exposes the two string manipulation methods over the channel, and that s what your Flex application invokes. The following is the Flex application code:
< xml version="1.0" encoding="utf-8" > <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/halo" xmlns:as3rpclib="com.ak33m.rpc.xmlrpc.*" minWidth="1024" minHeight="768"> <s:creationComplete> <![CDATA[ callFunction(); ]]> </s:creationComplete> <fx:Script> <![CDATA[ import mx.controls.Alert; var firstString:String; var secondString:String; var output:String; function callFunction () { output = xmlrpctojava.joinString(firstString,secondString); trace(output); output = xmlrpctojava.reverseString(firstString); trace(output); } ]]> </fx:Script> <fx:Declarations> <!-- Place non-visual elements (e.g., services, value objects) here --> <as3rpclib:XMLRPCObject id="xmlrpctojava" endpoint="http:// 127.0.0.1:8080/xmlrpc" destination="xmlrpcendpoint" fault="Alert.show(event. fault.faultString,event.fault.faultCode)"> </as3rpclib:XMLRPCObject > </fx:Declarations> </s:Application>
The XMLRPCObject is the key component of the as3-rpclib library that provides the XML-RPC client functionality. The XMLRPCObject indirectly inherits from mx.rpc.AbstractService, which is the base class for both WebService and RemoteObject.
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That s all we ll say here about XML-RPC. To use XML-RPC in real-life situations, you should study as3rpclib thoroughly and understand how different method invocation types and different data types work with XML-RPC.
Walking Through a JSON-RPC Example
JavaScript Object Notation (JSON) is a lightweight data interchange format. It s based on a subset of the ECMA standard that JavaScript implements but is language-independent and uses a simple text-based format that is easy to parse and generate. The official web site for JSON is http://www.json.org. AS3 Core Library (http://code.google.com/p/as3corelib/), an open source and well-supported library for AS3, has utility classes to serialize and parse JSON messages. If your remote Java source publishes data in JSON format and is accessible over a URL, you could get the data and consume it with the help of this library. A simple application might look like the following:
< xml version="1.0" encoding="utf-8" > <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/halo" minWidth="1024" minHeight="768"> <fx:Script> <![CDATA[ import mx.collections.ArrayCollection; import mx.rpc.events.ResultEvent; import com.adobe.serialization.json.JSON; private function onJSONLoad(event:ResultEvent):void { //get the raw JSON data and cast to String var rawData:String = String(event.result); //decode the data to ActionScript using the JSON API //in this case, the JSON data is a serialize Array of Objects. var arr:Array = (JSON.decode(rawData) as Array); //create a new ArrayCollection passing the de-serialized Array //ArrayCollections work better as DataProviders, as they can //be watched for changes. var dp:ArrayCollection = new ArrayCollection(arr); //pass the ArrayCollection to the DataGrid as its dataProvider. grid.dataProvider = dp; } ]]> </fx:Script> <fx:Declarations> <!-- Place non-visual elements (e.g., services, value objects) here -->
<mx:HTTPService id="service" resultFormat="text" url=" ttp://someurl.com/somedata.json" h result="onJSONLoad(event)" /> </fx:Declarations> <s:SkinnableContainer> <s:layout> <s:VerticalLayout horizontalAlign="center" paddingLeft="40" paddingTop="40" /> </s:layout> <mx:DataGrid id="grid" right="10" left="10" top="10" bottom="10"> <mx:columns> <mx:DataGridColumn headerText="Service" dataField="src"/> <mx:DataGridColumn headerText="Title" dataField="title"/> </mx:columns> </mx:DataGrid> </s:SkinnableContainer> </s:Application>
JSON-RPC is a lightweight Remote Procedure Call specification that uses the simple but powerful JSON message scheme. JSON-RPC defines communication between two peers. The specification does not limit the type of protocol for communication but recommends persistent communication over TCP/IP-based socket connections. JSON-RPC can also use HTTP with a few workarounds. The peers can send two types of messages:
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