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 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
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:
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: