使用base64 对图像进行 转换的小程序。附上对视频进行截图的功能程序。

java端，对jpeg图像转码成 base64字串

/*

* Created on 2008-9-25

*

* 徐泽宇 roamer

*/

package tester;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import sun.misc.BASE64Decoder;

import sun.misc.BASE64Encoder;

public class Image2Base64

{

public static void main(String[] args)

{

String strImg = GetImageStr();

GenerateImage(strImg);

}

public static String GetImageStr()

{//将图片文件转化为字节数组字符串，并对其进行Base64编码处理

String imgFile = "d://1.jpg";//待处理的图片

InputStream in = null;

byte[] data = null;

//读取图片字节数组

try

{

in = new FileInputStream(imgFile);

data = new byte[in.available()];

in.read(data);

in.close();

}

catch (IOException e)

{

e.printStackTrace();

}

//对字节数组Base64编码

BASE64Encoder encoder = new BASE64Encoder();

System.out.print(encoder.encode(data));

return encoder.encode(data);//返回Base64编码过的字节数组字符串

}

public static boolean GenerateImage(String imgStr)

{//对字节数组字符串进行Base64解码并生成图片

if (imgStr == null) //图像数据为空

return false;

BASE64Decoder decoder = new BASE64Decoder();

try

{

//Base64解码

byte[] b = decoder.decodeBuffer(imgStr);

for(int i=0;i<b.length;++i)

{

if(b[i]<0)

{//调整异常数据

b[i]+=256;

}

}

//生成jpeg图片

String imgFilePath = "d://2.jpg";//新生成的图片

OutputStream out = new FileOutputStream(imgFilePath);

out.write(b);

out.flush();

out.close();

return true;

}

catch (Exception e)

{

return false;

}

}

}

flex 这端对base64编码 转换成图片

<?xml version="1.0" encoding="utf-8"?>

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

layout="vertical"

verticalAlign="middle"

backgroundColor="white"

creationComplete="init();">

<mx:Script>

<![CDATA[

import mx.utils.Base64Decoder;

private var base64Dec:Base64Decoder;

private function decode():void{

}

private function load():void{

mx.controls.Alert.show(this.textArea.text);

var byteArr:ByteArray;

base64Dec = new Base64Decoder();

base64Dec.decode(this.textArea.text);

byteArr = base64Dec.toByteArray();

img.load(byteArr);

}

private function init():void {

}

]]>

</mx:Script>

<mx:Form width="100%" height="100%">

<mx:FormItem label="image:">

<mx:Image id="img" />

</mx:FormItem>

<mx:FormItem label="source:"

width="100%"

height="100%">

<mx:TextArea id="textArea"

text=""

editable="true"

width="100%"

height="100%" />

</mx:FormItem>

</mx:Form>

<mx:Button label="显示" click="load()">

</mx:Button>

</mx:Application>

对视频进行截图。然后生成base64字符串传递给RO的小程序。

<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="388" height="454" creationComplete="initApp()">

<mx:Style>

Alert{font-size:12px;}

</mx:Style>

<mx:Script>

<![CDATA[

import mx.events.CloseEvent;

import mx.rpc.events.FaultEvent;

import mx.rpc.events.ResultEvent;

import mx.controls.Alert;

import mx.rpc.remoting.RemoteObject;

import mx.graphics.ImageSnapshot;

private static const DEFAULT_CAMERA_WIDTH:Number = 160; //摄像头显示宽度

private static const DEFAULT_CAMERA_HEIGHT:Number = 120; //摄像头显示高度

private static const DEFAULT_WEBSERVICE_URL:String = "http://localhost:1888/Web/TestWebService.asmx?WSDL"; //WebService地址

private var m_camera:Camera; //定义一个摄像头

private var m_localVideo:Video; //定义一个本地视频

private var m_pictureBitmapData:BitmapData //定义视频截图

[Bindable]

private var m_pictureData:String;

[Bindable]

private var base64String:String="";

private function initApp():void

{

t_btn_Shooting.enabled = false;

t_ban_Save.enabled = false;

initCamera();

}

//初始化摄像头

private function initCamera():void

{

m_camera = Camera.getCamera();

if(m_camera != null)

{

m_camera.addEventListener(StatusEvent.STATUS,__onCameraStatusHandler);

m_camera.setMode(DEFAULT_CAMERA_WIDTH,DEFAULT_CAMERA_HEIGHT,30);

m_localVideo = new Video();

m_localVideo.width = DEFAULT_CAMERA_WIDTH;

m_localVideo.height = DEFAULT_CAMERA_HEIGHT;

m_localVideo.attachCamera(m_camera);

t_vd_Video.addChild(m_localVideo);

}

else

{

Alert.show("没有找到摄像头，是否重新查找。","提示：",Alert.OK|Alert.NO,this,__InitCamera);

return;

}

}

//拍照按钮事件，进行视频截图

private function SnapshotPicture():void

{

m_pictureBitmapData = new BitmapData(DEFAULT_CAMERA_WIDTH,DEFAULT_CAMERA_HEIGHT);

m_pictureBitmapData.draw(t_vd_Video,new Matrix());

var m_pictureBitmap:Bitmap = new Bitmap(m_pictureBitmapData);

t_img_Picture.addChild(m_pictureBitmap);

t_panel_Picture.visible = true;

t_ban_Save.enabled = true;

}

//保存按钮事件，保存视频截图

//通过RO保存

private function SavePicture():void

{

var ohSnap:ImageSnapshot = ImageSnapshot.captureImage(this.t_img_Picture);

this.base64String= ImageSnapshot.encodeImageAsBase64(ohSnap);

this.picString.text =base64String;

var ro:RemoteObject = new RemoteObject("cameraServiceRO");

ro.addEventListener(FaultEvent.FAULT,__onSavePictureFault);

ro.addEventListener(ResultEvent.RESULT,__onSavePictureResult);

ro.save(this.base64String);

}

//检测摄像头权限事件

private function __onCameraStatusHandler(event:StatusEvent):void

{

if(!m_camera.muted)

{

t_btn_Shooting.enabled = true;

}

else

{

Alert.show("无法链接到活动摄像头，是否重新检测。","提示：",Alert.OK|Alert.NO,this,__InitCamera);

}

m_camera.removeEventListener(StatusEvent.STATUS,__onCameraStatusHandler);

}

//当摄像头不存在，或连接不正常时重新获取

private function __InitCamera(event:CloseEvent):void

{

if(event.detail == Alert.OK)

{

initApp();

}

}

//WebService保存图片成功事件

private function __onSavePictureResult(event:ResultEvent):void

{

Alert.show("ok");

}

//连接WebService失败事件

private function __onSavePictureFault(event:FaultEvent):void

{

//Alert.show(event.fault.toString(),"提示",Alert.OK);

Alert.show(event.fault.toString());

}

//保存图片成功后的弹出窗口确认事件

private function __onAlertCloseHandler(event:CloseEvent):void

{

if(event.detail == Alert.OK)

{

//trace("转向页面");

}

}

]]>

</mx:Script>

<mx:Panel x="10" y="10" width="180" height="200" layout="absolute" title="视频拍照" fontSize="12">

<mx:VideoDisplay id="t_vd_Video" width="160" height="120"/>

<mx:ControlBar horizontalAlign="right">

<mx:Button id="t_btn_Shooting" label="拍照" click="SnapshotPicture()"/>

</mx:ControlBar>

</mx:Panel>

<mx:Panel id="t_panel_Picture" x="198" y="10" width="180" height="200" layout="absolute" title="拍照图片" fontSize="12" visible="false">

<mx:Image id="t_img_Picture" x="0" y="0" width="160" height="120"/>

<mx:ControlBar horizontalAlign="right">

<mx:Button id="t_ban_Save" label="保存" click="SavePicture()" />

</mx:ControlBar>

</mx:Panel>

<mx:TextArea text="{base64String}" id="picString" x="10" y="218" width="368" height="226"/>

</mx:Application>