Flex实现QQ网页提取天气信息

以前用C#实现了从QQ天气网页提取天气信息显示，最近了解Flex，随便测试了一下Flex版的QQ天气抓取，效果还不错。

1、预备知识

Flex是Adobe提供的基于Flash环境的RIA展现技术，主要采用MXML+Action Script来编写程序、界面，然后通过编译器编译成flash格式的SWF文件发布到网站上。

实现该功能需要安装Flex SDK，可以从Adobe网站上面下载，或者安装Flex Builder plugin+Eclipse来开发。

同时需要具备简单的正则表达式知识。

2、界面布局、代码实现

文件：QQWeather.mxml

<?
xml version=”1.0″ encoding=”utf-8″
?>

<
mx:Application
xmlns:mx
=”http://www.adobe.com/2006/mxml”
layout
=”absolute”
width
=”213″
height
=”234″
  creationComplete
=”initApp()”
backgroundGradientAlphas
=”[1.0, 1.0]”
backgroundGradientColors
=”[#F6FBFC, #3FEEDC]”
>


<
mx:Style
>

        .myfont{font-size:12pt;font-family:’宋体’;}

</
mx:Style
>


<
mx:Script
source
=”QQWeather.as”
></
mx:Script
>


<
mx:Label
x
=”10″
y
=”53″
text
=”选择城市:”
styleName
=”myfont”
/>


<
mx:ComboBox
id
=”cmbCity”
x
=”66″
y
=”49″
width
=”133″
rowCount
=”6″
change
=”changeHandler(event);”
styleName
=”myfont”
></
mx:ComboBox
>


<
mx:Image
x
=”10″
y
=”10″
source
=”@Embed(‘../title.gif’)”
width
=”189″

/>


<
mx:Image
x
=”10″
y
=”106″
source
=”@Embed(‘../tem1.png’)”
width
=”57″
height
=”13″
/>


<
mx:Image
x
=”10″
y
=”132″
source
=”@Embed(‘../tem2.png’)”
width
=”57″
height
=”13″
/>


<
mx:Image
x
=”10″
y
=”178″
source
=”@Embed(‘../tem3.png’)”
width
=”57″
height
=”13″
/>


<
mx:Image
x
=”10″
y
=”154″
source
=”@Embed(‘../tem5.png’)”
width
=”57″
height
=”13″
/>


<
mx:Label
x
=”75″
y
=”103.5″
text
=” Flex实现QQ网页提取天气信息

“
width
=”110″
styleName
=”myfont”
id
=”t1″
/>

<
mx:Label
x
=”75″
y
=”129.5″
text
=” Flex实现QQ网页提取天气信息

“
width
=”110″
styleName
=”myfont”
id
=”t2″
/>

<
mx:Label
x
=”75″
y
=”151.5″
text
=” Flex实现QQ网页提取天气信息

“
width
=”110″
styleName
=”myfont”
id
=”t3″
/>

<
mx:Label
x
=”75″
y
=”175.5″
text
=” Flex实现QQ网页提取天气信息

“
width
=”110″
styleName
=”myfont”
id
=”t4″
/>


<
mx:Label
x
=”34″
y
=”202″
text
=”Label”
width
=”169″
styleName
=”myfont”
textAlign
=”right”
id
=”lbToday”
/>


<
mx:Label
x
=”10″
y
=”80″
width
=”193″
id
=”t0″
styleName
=”myfont”
fontWeight
=”normal”
/>



</
mx:Application
>

后台脚本：QQWeather.as

1
//
ActionScript file

2
import
flash.events.Event;

3
import
flash.events.SecurityErrorEvent;

4

5
import
mx.collections.ArrayCollection;

6
import
mx.controls.Alert;

7
import
mx.utils.Base64Encoder;

8

9
private
var loader:URLStream;

10
private
var htmldata:String;

11
private
var ifloaded:Boolean
=
false
;

12
private
var dataUrl:String
=
“
http://weather.qq.com/inc/ss*.htm
“
;

13

14
public
function initApp():
void
{

15
    var t:Date
=
new
Date();

16
    lbToday.text
=
t.fullYear
+
“
–
“
+
(t.month
+
1
)
+
“
–
“
+
t.date
+
“

“
+
t.hours
+
“
:
“
+
t.minutes
+
“
:
“
+
t.seconds;

17
    loadUrl(
“
125
“
,parseCityInfo);

18
}

19
private
function loadUrl(cityno:String,callback:Function):
void
{

20
    loader
=

new
URLStream();

21
    loader.addEventListener(Event.COMPLETE, callback);

22
    loader.addEventListener(
“
securityError
“
,onSecurityError );

23
    var addr:String
=
dataUrl.replace(
/
\
*/
,cityno);

24
    trace(
“
Loading
“
,addr);

25
    var request:URLRequest
=

new
URLRequest(addr);

26

//
var enc:Base64Encoder=new Base64Encoder();

27

//
enc.encodeUTFBytes(addr);

28

//
var request:URLRequest = new URLRequest(“
http://localhost/httpproxy/webservlet?data=
“+enc.toString());

29

try
{

30
        loader.load(request);

31
    }
catch
(error:Error) {

32
        Alert.show(
“
不能连接服务器：
“
+
addr,
“
Tips
“
);

33
    }

34
}

35
private
function onSecurityError(event:SecurityErrorEvent):
void
{

36
    Alert.show(
“
安全错误：
“
+
event.text,
“
Tips
“
);

37
}

38
private
function parseCityInfo(event:Event):
void
{

39
    var sm:URLStream
=
event.target as URLStream;

40
    htmldata
=
sm.readMultiByte(sm.bytesAvailable,
“
gb2312
“
);

41
    trace(
“
completeHandler:
“

+
htmldata );

42

if
(
!
ifloaded){

43
        var pattern:RegExp
=
new
RegExp(
“
value=\
“
(\\d{

1
,
3
})\
“
>([^<]*)</option>
“
,
“
g
“
);

44
        var result:Object
=
pattern.exec(htmldata);

45
        var data:ArrayCollection
=

new
ArrayCollection();

46
        var item:Object;

47

while
(result
!=

null
) {

48
             trace(result[
1
],result[
2
]);

49
             item
=
new
Object();

50
             item.label
=
result[
2
];

51
             item.data
=
result[
1
];

52
             data.addItem(item);

53
             result
=
pattern.exec(htmldata);

54
         }

55
        cmbCity.dataProvider
=
data;

56
        ifloaded
=
true
;

57
    }

58
    parseWeather();

59
}

60
private
function parseWeather():
void
{

61

//
分析天气信息

62
    var item:Object
=
cmbCity.selectedItem;

63
    var pattern:RegExp
=
new
RegExp(
“
align=\
“
center\
“
>([^<]*)</td>
“
,
“
g
“
);

64
    var result:Object
=
pattern.exec(htmldata);

65
    var data:Array
=
new
Array();

66

while
(result
!=

null
) {

67
        data.push(trimString(result[
1
]));

68
        trace(result[
1
]);

69
        result
=
pattern.exec(htmldata);

70
    }

71
    t0.text
=
item.label
+
“
:
“
+
data[
0
];

72
    t1.text
=
data[
1
];

73
    t2.text
=
data[
2
];

74
    t3.text
=
data[
3
];

75
    t4.text
=
data[
4
];

76
}

77
private
function changeHandler(event:Event):
void
{

78
    var item:Object
=
ComboBox(event.target).selectedItem;

79
    trace(item.data);

80
    loadUrl(item.data,parseCityInfo);

81
}

82
private
function trimString(s:String):String{

83

return
s.replace(
/
(
^
\s
*
)
|
(\s
*
$)
/
g,
“”
);

84
}

用mxmlc命令编译之后，运行效果如下：

Flex实现QQ网页提取天气信息

3、注意事项

根据flash的sandbox安全模型要求，A域名下的flash文件只能从A域名中获取服务端数据，如果需要从B域名中提取数据，需要B域名配置一个crossdomain.xml的文件，允许A从B

下载数据，但是我们不可能有这样的公关能力要求腾讯在http://weather.qq.com/下面放一个xml文件，允许其他网站访问，因此只能另辟蹊径：

方案1：A域名下自己实现一个代理，从B域名网页下载数据返回，这样就回避了sandbox的安全性错误，Line 26-28注释的代码就是我用java Servlet实现的一个代理。

方案2：建立代理服务器，例如squid或者Apache代理

方案3：采用adobe提供的开源软件bladeDS,该软件采用J2EE War方式发布，可以提供RPC、HTTP Proxy的代理功能

方案4：采用Adobe的企业级解决方案Adobe LiveCycle ES ，这个东西试用版就2.5G，真是庞然大物，受不了了，没见过这样的软件，一个Oracle数据库也就几百M而已，想不通。

发布者：全栈程序员-站长，转载请注明出处：https://javaforall.net/111004.html原文链接：https://javaforall.net

Flex实现QQ网页提取天气信息

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