Flex3 CRUD 与Java后台交互 完整Demo

Flex3 CRUD 与Java后台交互 完整Demo

网上关于flex java curd的例子很少,官方的文档不全且有错误.今天自己做的个crud的例子,
不带分页(分页网上有很多例子了).
上图:


mxml:

< mx:Application
     xmlns:mx ="http://www.adobe.com/2006/mxml"
    layout ="absolute" >

    < mx:Script >
         <![CDATA[
            include "product.as";
         ]]>
     </ mx:Script >

     < mx:HTTPService
         id ="productService"
        url ="http://localhost:8888/flex2/productServlet"
        resultFormat ="e4x"
        useProxy ="false"   />    <!-- url改成您的数据请求地址 -->

     < mx:ViewStack  id ="viewstack1"  width ="731"  height ="473"   x ="86.5"  y ="10" >
     <!-- index 0  -->
         < mx:Canvas  label ="Form View"  width ="100%"  height ="100%" >
             < mx:Form  horizontalCenter ="0"  verticalCenter ="0"
                backgroundColor ="#18E1CC"  width ="124"  height ="56" >
                     < mx:Button  label ="进入"  click ="fill()"  width ="100" />
             </ mx:Form >
         </ mx:Canvas >
     <!-- index 1 -->     
         < mx:Panel  label ="AdvancedDataGrid 显示"  width ="100%"  height ="100%"   layout ="absolute" >
             < mx:AdvancedDataGrid  id ="grid1"  width ="666"  height ="380"  dataProvider ="{_result.product}"   editable ="true"  itemEditEnd ="updateHandler(event)"    x ="10"  y ="10" >
                   < mx:columns >
                      < mx:AdvancedDataGridColumn   dataField ="id"  headerText ="ID"   editable ="false" />
                     < mx:AdvancedDataGridColumn   dataField ="productName"  headerText ="产品名称"   />
                     < mx:AdvancedDataGridColumn   dataField ="remark"  headerText ="备注"   />
                   </ mx:columns >
             </ mx:AdvancedDataGrid >
            
             < mx:Button  x ="60"  y ="401"  label ="添加"  click ="{viewstack1.selectedIndex = 2}" />
             < mx:Button  label ="删除"    x ="180"  y ="401"  click ="remove()" />     
         </ mx:Panel >
     <!-- index 2 -->
         < mx:Canvas  label ="添加新记录"  width ="100%"  height ="100%"  id ="canvas3"   >
             < mx:Form
                     backgroundColor ="#FFFFFF"   verticalCenter ="-91"  horizontalCenter ="-138" >
                    
                 < mx:FormItem  label =""  width ="189"  height ="20" >
                     < mx:Button   label ="返回"  click ="this.viewstack1.selectedIndex=1" />
                     < mx:TextInput  id ="hidden_id"   visible ="false"   />
                 </ mx:FormItem >     
                
                 < mx:FormItem  label ="产品名称" >
                     < mx:TextInput  id ="productName" />
                 </ mx:FormItem >
                
                 < mx:FormItem  label ="备注" >
                     < mx:TextInput  id ="remark" />
                 </ mx:FormItem >
                
                 < mx:Button  label ="保存"  click ="insertProduct()"  id ="btn"   />
             </ mx:Form >
         </ mx:Canvas >
        
     </ mx:ViewStack >

   
</ mx:Application >

as:

import  mx.collections.XMLListCollection;
import  mx.controls.Alert;
import  mx.controls.TextInput;
import  mx.events.AdvancedDataGridEvent;
import  mx.events.CloseEvent;
import  mx.rpc.events.ResultEvent;

private  var params:Object  =   new  Object();

// private var ld:XMLListCollection; 官方文档的XMLListCollection并不能用,例子有问题郁闷
[Bindable]
private  var _result : XML ;  // 注意文件名防止冲突
/** */ /**
 * xml数据的渲染
 * */
public  function resultHandler(event:ResultEvent): void  
{
    _result = XML(event.result);
}
/** */ /**
 * 查询所有产品的按钮事件
 * */
public  function insertItemHandler(event:ResultEvent): void  
{
    fill();
}
/** */ /**
 * 查询所有产品的方法 
 * */
public  function fill(): void
{
    //为productService(HTTPService) 重新绑定监听器(查询)
    productService.removeEventListener(ResultEvent.RESULT,insertItemHandler);
    productService.addEventListener(ResultEvent.RESULT,resultHandler);
    productService.method = "GET";
    //要传递的参数
    params['method'] = "findAll";
    productService.cancel();
    productService.send(params);
    //切换到Grid视图
    viewstack1.selectedIndex=1;
}
/** */ /**
 * 插入产品
 * */
public  function insertProduct(): void
{
    //绑定新的监听器(插入)
    productService.removeEventListener(ResultEvent.RESULT,resultHandler);
    productService.addEventListener(ResultEvent.RESULT,insertItemHandler);
    productService.method = "POST";
    //传递Form表单参数
    params = {"method": "save", "id": NaN, "productName": productName.text,
                 "remark": remark.text};
    productService.cancel();
    productService.send(params);
    clearInputFields();
}
/** */ /**
 * 
 * 更新记录的事件处理函数
 * 
 * */
public  function updateHandler(event:AdvancedDataGridEvent): void
{
    //取消的话不更新
    if(event.reason == "cancelled")
    {
        return;
    }
    //重新注册
    productService.removeEventListener(ResultEvent.RESULT,resultHandler);
    productService.addEventListener(ResultEvent.RESULT,insertItemHandler);
     //得到输入后的新数据    
     var newData:String = (TextInput(event.currentTarget.itemEditorInstance)).text;
     //得到输入前的三个数据
     var _id : int  = this.grid1.selectedItem["id"];
     var _productName :String = this.grid1.selectedItem["productName"];
     var _remark :String = this.grid1.selectedItem["remark"];
     //第二列为产品名称
     if(event.columnIndex == 1)
     {
         _productName = newData;
     }
     //第三列为备注
     if(event.columnIndex == 2)
     {
         _remark = newData;
     }
     params = {"method": "update", "id": _id,"productName":_productName,"remark":_remark};
     productService.cancel();
     productService.send(params);
}

/** */ /**
 * 删除的方法
 * */
public  function remove() :  void
{
    var index:int = this.grid1.selectedIndex;
    if(index == -1)
    {
         Alert.show("您没有选择任何记录","提示");
         return;
    }
     Alert.yesLabel = "确定";
     Alert.cancelLabel = "取消";
     Alert.show("确定要删除吗?","提示",Alert.YES|Alert.CANCEL,this,defaultCloseHandler);
}
/** */ /**
 * 处理选择是否删除后的事件
 * 
 * */
public  function defaultCloseHandler(event:CloseEvent): void
{
     //如果点击了确定
     if(event.detail == Alert.YES)
     {
          productService.removeEventListener(ResultEvent.RESULT,resultHandler);
         productService.addEventListener(ResultEvent.RESULT,insertItemHandler);
          var id : String  = this.grid1.selectedItem["id"];
         params = {"method": "remove", "id": id};
         productService.cancel();
         productService.send(params);
     }
}
/** */ /**
 * 清除form中的属性值
 * */
private  function clearInputFields(): void
{
    productName.text = "";
    remark.text = "";
}

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