Flex使用JSON格式与Java通信

关键字: 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 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>    

<?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
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();    
   }    
}   

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
Java代码
public function showTotalMark(event:ResultEvent):void{    
    var marks:Object= JSON.decode(event.result as String);    
     note.text = marks.name + marks.mark;        
}   

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：