第二种采用HttpService与服务器数据交互
其实WebService也可以返回Json数据给Flex,至于.net中使用Json我在这里用到了Newtonsoft.Json 而Flex端用到了as3corelib.swc,网上都可以下,哪下,用法就不在这里说了,没有的,不会用的google一下,很多相关文章.
1.新建一个.net页面和一般处理程序(如果想用两个.net页面,或两个一般处理程序都可以),
我会用.net页面来返回字符串,用一般处理程序来返回Json
选看.net页面下的代码
{
public partial class ForFlexData : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//提供两种请求方法数据
Response.Write(ReutrnStringByRequestType(Request.RequestType));
}
//创建数据
private string ReutrnStringByRequestType(string rt)
{
DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("Name"));
dt.Columns.Add(new DataColumn("Sex"));
dt.Columns.Add(new DataColumn("Age"));
dt.Columns.Add(new DataColumn("Address"));
string name = string.Empty;
int age = 0;
if (rt.ToLower() == "get") //Get请求方式
{
name = Request.QueryString["name"].ToString();
age = Convert.ToInt32(Request.QueryString["age"]);
}
else if (Request.RequestType.ToLower() == "post")// //Post请求方式
{
name = Request.Form["name"].ToString();
age = Convert.ToInt32(Request.Form["age"]);
}
for (int i = 0; i < 10; i++)
{
dt.Rows.Add(new object[] { name, i % 2 == 0 ? "女" : "男", age, rt });
}//添加十行数据
DataSet ds = new DataSet();
ds.Tables.Add(dt);
return ds.GetXml();
}
}
}
再看看一般处理程序下的代码,它是用来返回Json数据的
{
/// <summary>
/// Summary description for $codebehindclassname$
/// </summary>
public class ForFlexJsonData : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
JsonSerializer json = new JsonSerializer();
json.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
json.NullValueHandling = NullValueHandling.Ignore;
json.ObjectCreationHandling = ObjectCreationHandling.Replace;
json.MissingMemberHandling = MissingMemberHandling.Ignore;
json.Converters.Add(new DataTableJson());
StringWriter sw = new StringWriter();
JsonTextWriter writer = new JsonTextWriter(sw);
writer.Formatting = Formatting.Indented;
writer.QuoteChar = '"';
json.Serialize(writer,GetData(context.Request));
string output = sw.ToString();
writer.Close();
sw.Close();
context.Response.Write(sw.ToString());
}
//创建数据源
private DataTable GetData(HttpRequest hr)
{
DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("Name"));
dt.Columns.Add(new DataColumn("Sex"));
dt.Columns.Add(new DataColumn("Age"));
dt.Columns.Add(new DataColumn("Address"));
for (int i = 0; i < 10; i++)
{
dt.Rows.Add(new object[] { "Dy" + i.ToString(), i % 2 == 0 ? "女" : "男", i * 10, hr.RequestType.ToLower()});
}//添加十行数据
return dt;
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
下面新建一个Flex项目
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/halo" minWidth="1024" minHeight="768">
<s:layout>
<s:BasicLayout/>
</s:layout>
<fx:Script>
<![CDATA[
import com.adobe.serialization.json.JSONDecoder;
import mx.collections.ArrayCollection;
import mx.controls.Alert;
import mx.rpc.events.FaultEvent;
import mx.rpc.events.ResultEvent;
import mx.rpc.http.HTTPService;
//写义一个HttpService请求s
private var httpservice:HTTPService;
private function InitHttpService():void
{
httpservice=new HTTPService();
httpservice.url="http://192.168.2.8:80/ForFlexData.aspx"
httpservice.contentType="application/x-www-form-urlencoded";
httpservice.useProxy=false;
}
protected function btnCallGet_clickHandler(event:MouseEvent):void
{
if(httpservice==null)
{
InitHttpService();
}
httpservice.addEventListener(FaultEvent.FAULT,OnFault);
httpservice.addEventListener(ResultEvent.RESULT,OnResult);
httpservice.method="get";
var obj:URLVariables=new URLVariables();
obj.name="louja";
obj.age="24";
httpservice.request=obj;
httpservice.send();
}
protected function btnCallPost_clickHandler(event:MouseEvent):void
{
if(httpservice==null)
{
InitHttpService();
}
httpservice.addEventListener(FaultEvent.FAULT,OnFault);
httpservice.addEventListener(ResultEvent.RESULT,OnResult);
httpservice.method="post";
var postData:URLVariables=new URLVariables();
postData.name="dy";
postData.age="21";
httpservice.request=postData;
httpservice.send();
}
private function OnFault(event:FaultEvent):void
{
mx.controls.Alert.show("失败了!","失败");
}
private function OnResult(event:ResultEvent):void
{
//返回结果
dgData.dataProvider=event.result.NewDataSet.Table1;
httpservice.removeEventListener(FaultEvent.FAULT,OnFault);
httpservice.removeEventListener(ResultEvent.RESULT,OnResult);
httpservice.logout();
}
//发出http请求,返回Json
protected function btnJson_clickHandler(event:MouseEvent):void
{
var httpJson:HTTPService=new HTTPService();
运行Flex项目,呵呵,Get,Post和Json数据都交互成功了!
有表达不清的地方，望大家指出，谢谢！
作者：Louja
出处：http://loujady.cnblogs.com
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