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,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 = "";
}