Flex在线拍照功能

功能：在线拍照
简介：用flex与java结合实现在线拍照
需求：为了满足希望通过摄像头拍照的图片，然后通过服务器来展示需要



实现代码：
flex:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="388" height="222" creationComplete="initApp()" backgroundColor="#A6C9E2">
     <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.core.Application;
            
             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 var DEFAULT_WEBSERVICE_URL:String = ""; //WebService地址
             private var str:String;
            
             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;
            
             private function initApp():void
             {
                 t_btn_Shooting.enabled = false;
                 t_ban_Save.enabled = false;
                 initCamera();
                 DEFAULT_WEBSERVICE_URL = Application.application.parameters.contextPath+"/onLineTakePhotoServlet";
                 t_ws_SavePicture.url=DEFAULT_WEBSERVICE_URL;
             }
            
             //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WebService保存
             private function SavePicture():void
             {
                 m_pictureData = "";
                 for(var i:int = 0; i < DEFAULT_CAMERA_WIDTH; i++)
                 {
                     for(var j:int = 0; j < DEFAULT_CAMERA_HEIGHT; j++)
                     {
                         if(m_pictureData.length > 0)
                         {
                             m_pictureData += "," + m_pictureBitmapData.getPixel32(i,j).toString();
                         }
                         else
                         {
                             m_pictureData = m_pictureBitmapData.getPixel32(i,j).toString();
                         }
                     }
                 }
                 
                 var params:URLVariables = new URLVariables();
     params.width = DEFAULT_CAMERA_WIDTH;
     params.height = DEFAULT_CAMERA_HEIGHT;
     params.bitmap_data = m_pictureData;
     t_ws_SavePicture.send(params);
             }
            
             //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
             {
                 //trace(event.result);
                 if(event.result.toString() != "保存失败")
                 {
                   str = event.result.toString();
                   
                     Alert.show("保存成功,是否关闭窗口？","提示",3,this,__onAlertCloseHandler);
                 }
                 else
                 {
                     Alert.show(event.result.toString(),"提示",Alert.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("连接服务器失败。","提示",Alert.OK);
             }
            
             //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.YES)
                 {
                    ExternalInterface.call("setValueToField",str);
                 }
             }
         ]]>
     </mx:Script>
     <mx:HTTPService id="t_ws_SavePicture" showBusyCursor="true" method="POST" useProxy="false" result="__onSavePictureResult(event)" fault="__onSavePictureFault(event)"/>
     <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:Application>

java：

package cn.myapps.core.onlinetakephoto;

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

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

import cn.myapps.constans.Environment;
import cn.myapps.util.sequence.Sequence;

/**
 * Servlet implementation class onLineTakePhotoServlet
 */
public class onLineTakePhotoServlet extends HttpServlet {
 private static final long serialVersionUID = 1L;
    
 private Environment env = Environment.getInstance();
 
 public void doGet(HttpServletRequest request, HttpServletResponse response)    
 throws ServletException, IOException {    
 processRequest(request, response);    
 }    
   
 public void doPost(HttpServletRequest request, HttpServletResponse response)    
  throws ServletException, IOException {    
 processRequest(request, response);    
 }    
 
 public void processRequest(HttpServletRequest request, HttpServletResponse response)

    throws ServletException, IOException {
  response.setContentType("text/html;charset=UTF-8");   
        response.setHeader("Pragma", "No-cache");   
        response.setHeader("Cache-Control", "no-cache");   
        response.setDateHeader("Expires", 0);   
  
        String bitmap_data = request.getParameter("bitmap_data");   
        int width = Integer.parseInt(request.getParameter("width"));   
        int height = Integer.parseInt(request.getParameter("height"));   
        BufferedImage img = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);   
  try {   
            int w = width;   
            int h = height;   
            int[] pixels = new int[w * h];   
            String[] m_tempPics = bitmap_data.split(",");   
            for (int x = 0; x < w; x++) {   
                for (int y = 0; y < h; y++) {   
                    Long pic_argb = Long.parseLong(m_tempPics[x * h + y]);   
                    int a = (int) (pic_argb >> 24 & 0xFF);   
                    int r = (int) (pic_argb >> 16 & 0xFF);   
                    int g = (int) (pic_argb >> 8 & 0xFF);   
                    int b = (int) (pic_argb & 0xFF);   
                    pixels[y * w + x] = new Color(r, g, b, a).getRGB();   
                }   
            }   
            img.setRGB(0, 0, w, h, pixels, 0, w);   
            img.flush();   
            ByteArrayOutputStream bao = new ByteArrayOutputStream();   
            ImageIO.write(img, "jpg", bao);   
            byte[] data = bao.toByteArray();  
            String filePath = env.getRealPath("/uploads/photo");
            //判断路径是否存在,若不存在则创建路径
            File upDir = new File(filePath);
            if (!upDir.exists())
            {
                upDir.mkdirs();
            }
            //生成随机文件名
            String saveName = Sequence.getSequence();
            String fileName = saveName + ".jpg";
            //写图片
            File f = new File(filePath+"\\" + fileName);
      DataOutputStream dos = new DataOutputStream(new FileOutputStream(f));
      dos.write(data);
      dos.flush();
      dos.close();
      response.setContentType("text/xml");   
            response.getWriter().write("/uploads/photo/" + fileName);   
        }
        catch(Exception ex)
        {
         response.setContentType("text/xml");   
            response.getWriter().write("保存失败");   
        }
 }

}