使用flex中的httpservice方法与java进行交互

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地球已经调至震动状态使用flex中的httpservice方法与java进行交互：

一、写服务器:
1.在myeclipse中建立web项目
2.写一个用来打印xml的servlet
3.当使用httpservice与java进行交互的时候不用改写remoting-config.xml文件
4.web.xml文件中配置servlet的访问地址(一般不用配置，当一个servlet建好之后myeclipse就会自动配置好web.xml文件，不用去改动，但是需要注意的是，当你在导入blazeds开发文件的时候他会改动web.xml文件，这时候你一定要将web.xml文件改过来，要不然flex在访问服务器的时候则反问不到你的servlet)。
5.当你的服务器端的servlet写好之后再去建立flex 项目，并且根据你之前建好的servlet项目在flex项目的属性项中配置flex服务器的访问地址。
6.写flex的mxml文件。

二、一个简单案例：
1.servlet源代码

复制代码代码如下:

 
package com.wle.flex.HttpService.java文件源代码 

package com.wle.flex; 

import java.io.IOException; 
import java.io.Writer; 

import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 

public class HttpService01 extends HttpServlet { 

public void doGet(HttpServletRequest request, HttpServletResponse response) 
throws ServletException, IOException { 

response.setContentType("text/xml;charset=utf-8"); 
Writer out = response.getWriter(); 
out.write("<?xml version='1.0' encoding='utf-8'?>"); 
out.write("<item>"); 
out.write("<student name='林冲' age='23' class='水泊梁山一班'/>"); 
out.write("<student name='李逵' age='24' class='水泊梁山二班'/>"); 
out.write("<student name='扈三娘' age='23' class='水泊梁山一班'/>"); 
out.write("<student name='时迁' age='24' class='水泊梁山二班'/>"); 
out.write("<student name='武松' age='23' class='水泊梁山一班'/>"); 
out.write("<student name='燕青' age='24' class='水泊梁山二班'/>"); 
out.write("</item>"); 
} 
public void doPost(HttpServletRequest request, HttpServletResponse response) 
throws ServletException, IOException { 
this.doGet(request, response); 
} 
} 

2.servlet对应的web.xml文件

复制代码代码如下:

 
<?xml version="1.0" encoding="UTF-8"?> 
<web-app version="3.0" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> 
<display-name></display-name> 
<servlet> 
<description>This is the description of my J2EE component</description> 
<display-name>This is the display name of my J2EE component</display-name> 
<servlet-name>HttpService01</servlet-name> 
<servlet-class>com.wle.flex.HttpService01</servlet-class> 
</servlet> 

<servlet-mapping> 
<servlet-name>HttpService01</servlet-name> 
<url-pattern>/wl/HttpService01</url-pattern> 
</servlet-mapping> 

</web-app> 

3.在webroot目录下导入blazeds文件

4.发布servlet项目
比如讲servlet项目发布到D:\Tomcat 6.0\webapps\flex_service_HttpService这个文件下

5.建立flex项目
建好flex项目之后，在项目上右键单击选择属性，在属性中的flex服务器选项中设置flex服务器的地址
配置信息如下:
文件根目录:D:\Tomcat 6.0\webapps\flex_service_HttpService
根URL(U)：http://localhost:8089/flex_service_HttpService
上下文根目录:/flex_service_HttpService
6.配置好flex项目的服务器之后就开始写flex源文件，如下：

复制代码代码如下:

 
<?xml version="1.0" encoding="utf-8"?> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
layout="vertical" 
fontSize="12" viewSourceURL="srcview/index.html" xmlns:s="library://ns.adobe.com/flex/spark"> 

<!--<mx:Style source="DGtoExcel.css"/>--> 


<mx:Script> 
<![CDATA[ 
import mx.collections.ArrayCollection; 
import mx.controls.Alert; 
import mx.events.FlexEvent; 
import mx.events.ItemClickEvent; 
import mx.rpc.events.FaultEvent; 

[Bindable] 
private var myAC:ArrayCollection; 

private function faultHandler(event:FaultEvent):void 
{ 
Alert.show(event.fault.faultString, event.fault.message); 
} 

// Function to filter out all items with gender 
private function maleFilterFunc(item:Object):Boolean { 
return item.gender == 1; 
} 

// Function to apply the filter function the ICollectionView. 
private function filterMale():void { 
myAC.filterFunction = maleFilterFunc; 
//Refresh the collection view to apply the filter. 
myAC.refresh(); 
} 

// Function to filter out all items with gender 
private function femaleFilterFunc(item:Object):Boolean { 
return item.gender == 0; 
} 

// Function to apply the filter function the ICollectionView. 
private function filterFemale():void { 
myAC.filterFunction = femaleFilterFunc; 
//Refresh the collection view to apply the filter. 
myAC.refresh(); 
} 

// Function to Reset the view to its original state. 
private function resetAC():void { 
myAC.filterFunction = null; 
//Refresh the collection view. 
myAC.refresh(); 
} 


// Event handler function to display the selected button 
private function filterHandler(event:ItemClickEvent):void { 
switch(event.currentTarget.selectedValue){ 
case 1: 
filterMale(); 
break; 
case 0: 
filterFemale(); 
break; 
case 2: 
resetAC(); 
break; 
default: 
break; 
} 

} 

protected function bt1_clickHandler():void 
{ 
myService.send(); 
} 

]]> 
</mx:Script> 
<mx:HTTPService id="myService" 
showBusyCursor="true" 
url="http://localhost:8089/flex_service_HttpService/wl/HttpService01" 
result="myAC = event.result.item.student" 
fault="faultHandler(event)" 
contentType="application/xml" 
/> 
<mx:HBox> 
<mx:RadioButtonGroup id="gendertype" itemClick="filterHandler(event);"/> 
<mx:RadioButton groupName="gendertype" id="rbMale" value="1" label="男" /> 
<mx:RadioButton groupName="gendertype" id="rbFemale" value="0" label="女" /> 
<mx:RadioButton groupName="gendertype" id="rbAll" value="2" label="所有" /> 
</mx:HBox> 
<mx:DataGrid id="myDG" width="100%" rowCount="20" 
dataProvider="{myAC}" > 
<mx:columns> 
<mx:DataGridColumn headerText="姓名" dataField="name"/> 
<mx:DataGridColumn headerText="年龄" dataField="age" /> 
<mx:DataGridColumn headerText="班级" dataField="class"/> 
</mx:columns> 
</mx:DataGrid> 
<mx:HBox> 
<s:Button id="bt1" label="提交" click="bt1_clickHandler()"/> 
</mx:HBox> 
</mx:Application> 