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Tham khảo tài liệu 'flex 3 with java- p5', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 8 In the following example we will use some third-party open source libraries to encode and decode JSON objects in Flex and JSP. They are as follows json-simple http code.google.com p json-simple A Java open source library for encoding and decoding JSON objects in Java as3corelib http code.google.com p as3corelib An ActionScript open source library for encoding and decoding JSON objects in Flex ActionScript Before we start writing code we will have to copy the as3corelib.swc file into our project s libs folder. This ensures that all JSON-related API classes are available during coding and compilation. So make sure that you have downloaded AS3CoreLib from the URL specified above. The .swc files are library files used in Flex or ActionScript programming. Think of them as Java s .jar files which contain all your compiled class files. Similarly the .swc files contain all your precompiled definitions which can be referenced by your .swf application. To know more about .SWC visit http livedocs.adobe.com flex 3 html help. html content compilers_30.html. We will start with writing the Flex MXML code which will use HTTPService to invoke a JSP page that builds and returns a JSON object. The MXML code xml version 1.0 encoding utf-8 mx Application xmlns mx http www.adobe.com 2006 mxml creationComp lete init mx Script CDATA import com.adobe.serialization.json.JSONDecoder import mx.rpc.events.FaultEvent import mx.controls.Alert import mx.rpc.events.ResultEvent private function init void httpSrv.send private function resultHandler event ResultEvent void var jd JSONDecoder new JSONDecoder String event.result dgGrid.dataProvider jd.getValue 187 Communicating with Server-side Java private function faultHandler event FaultEvent void Alert.show event.fault.message mx Script mx HTTPService id httpSrv url http 192.168.0.2 8180 JSONService.jsp result resultHandler event fault faultHandler event mx DataGrid id dgGrid width 100 height 100 mx Application In the above code we have .
