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>
posted @ 2012-02-18 14:06 张良阅读(721) 评论(0) 编辑收藏举报
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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。

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