Flex使用JSON格式与Java通信
Flex使用JSON格式与Java通信
在使用Flex,Java，Json更新Mysql数据【高级篇】 中我记得Flex界面中数据是使用一个JsonArray封装了JsonObject之后传给Java后台的。可是今天发现，如果你的数据只有一个JsonObject，那么是否直接传JsonObject也可以呢？试试看：
Xml代码 <>- <?xml version="1.0" encoding="utf-8"?>
- <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="initApp()">
- <mx:Script>
- <![CDATA[
- import mx.rpc.events.ResultEvent;
- import mx.collections.ArrayCollection;
- import com.adobe.serialization.json.JSON;
- [Bindable]
- private var stuMarkDataArray:ArrayCollection;
- private function initApp():void{
- stuMarkDataArray = new ArrayCollection();
- }
- public function sendStuInfo():void{
- var stuFaculty:String = facultyxt.text;
- var stuMajor:String = majortxt.text;
- var stuInfo:Object = new Object;
- stuInfo.faculty = stuFaculty;
- stuInfo.major = stuMajor;
- var stuStr:String = JSON.encode(stuInfo);
- sendInfo.getStuMarks(stuStr);
- }
- public function showStuMark(event:ResultEvent):void{
- note.text = "Success....";
- var rawArray:Array;
- var rawData:String = event.result as String;
- rawArray = JSON.decode(rawData) as Array;
- stuMarkDataArray = new ArrayCollection(rawArray);
- }
- public function getTotalMarks():void
- {
- getTotal.getTotalMarks();
- note.text="I am searching...";
- }
- public function showTotalMark(event:ResultEvent):void{
- note.text = event.result as String;
- }
- ]]>
- </mx:Script>
- <mx:RemoteObject id="sendInfo" destination="getStuMark" showBusyCursor="true" result="showStuMark(event)"/>
- <mx:RemoteObject id="getTotal" destination="getTotalMark" showBusyCursor="true" result="showTotalMark(event)"/>
- <mx:Panel x="39" y="31" width="346" height="301" layout="absolute">
- <mx:Label x="27" y="25" text="Faculty"/>
- <mx:TextInput x="72" y="23" id="facultyxt"/>
- <mx:TextInput x="72" y="64" id="majortxt"/>
- <mx:Label x="27" y="66" text="Major"/>
- <mx:Button x="27" y="92" label="各科成绩" width="109" click="sendStuInfo()"/>
- <mx:DataGrid x="10" y="140" height="79" width="304" dataProvider="{stuMarkDataArray}">
- <mx:columns>
- <mx:DataGridColumn headerText="Math" dataField="math"/>
- <mx:DataGridColumn headerText="Chinese" dataField="chn"/>
- <mx:DataGridColumn headerText="English" dataField="eng"/>
- </mx:columns>
- </mx:DataGrid>
- <mx:Label x="10" y="227" width="304" id="note" height="24"/>
- <mx:Button x="192" y="94" label="总成绩" click="getTotalMarks()"/>
- </mx:Panel>
- </mx:Application>
后台JSonTestJava.java
Java代码- package test;
- import net.sf.json.JSONArray;
- import net.sf.json.JSONObject;
- public class JsonTestJava {
- public String getStuMarks(String info){
- String result = new String();
- JSONObject jsonObject = JSONObject.fromObject(info);
- String faculty = jsonObject.getString("faculty");
- String major = jsonObject.getString("major");
- JSONArray stuMarksArray = new JSONArray();
- if(faculty.equals("IT") && major.equals("SE")){
- for(int i=0;i<3;i++){
- JSONObject stuObj = new JSONObject();
- stuObj.put("math", 100-i*2);
- stuObj.put("eng", 80+2*i);
- stuObj.put("chn", 90-i);
- stuMarksArray.add(stuObj);
- }
- }
- result = stuMarksArray.toString();
- return result;
- }
- public String getTotalMarks(){
- JSONObject stuObj = new JSONObject();
- stuObj.put("name", "leyond");
- stuObj.put("mark","344");
- return stuObj.toString();
- }
- }
使用的方法跟JSONArray差不多，只不过使用JsonArray的时候，需要先把每个jsonObject解析出来。所以比较方便的。但是 现在有一个问题，如果你在后台传给的前台Flex中的是一个JSONObject的数据，请问如何在前台解析出来的。就是这里的代码该如何写呢：
Js代码- public function showTotalMark(event:ResultEvent):void{
- var marks:Object= JSON.decode(event.result as String);
- note.text = marks.name + marks.mark;
- }
这样就可以了，marks.name 和marks.mark就可以分别解析出name和mark。是不是很方便呢。当然如果你的数据很多，就需要用到JSAONArray了。这里就不多讲了。这个是这个例子的效果实例：
Reference:
