flex图片剪切示例--预览、保存到本地、保存到服务器

图片剪切功能：

效果图：






flex代码:

<? xml version="1.0" encoding="utf-8" ?>
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"  layout ="absolute"  initialize ="init()"  xmlns:local ="astion.*" >
  < mx:Script >
   <![CDATA[
   import mx.controls.Image;
   import mx.graphics.ImageSnapshot;
   import flash.net.FileReference;
   import mx.graphics.codec.JPEGEncoder;
   import mx.managers.PopUpManager;
   import mx.containers.TitleWindow;
   import mx.controls.Alert;
   import mx.events.CloseEvent;
   import mx.core.IFlexDisplayObject;
   import mx.utils.*;
   import mx.core.Application;
   import astion.Dot;
   import astion.ScaleBox;
   
   public static const LINE_WIDTH:Number = 1;//缩放边框宽度
   private var file:FileReference;
   public var IMAGE_URL:String="http://localhost:8080/cutPicuter/aa/aa.jpg";
   private var loader:Loader;
   private var bmp:Bitmap;
            private var stream:URLStream;
            public var realPath:String="D:\myWorkSpace\cutPicuter\WebRoot\aa\aa.jpg";
   
   //初始化数据
   private function init():void{
    this.loader = new Loader();
                this.stream = new URLStream();
                this.loader.contentLoaderInfo.addEventListener(Event.COMPLETE,this.onComplete);
                this.loader.load(new URLRequest(encodeURI(this.IMAGE_URL)));//解决中文乱码
                this.stream.load(new URLRequest(encodeURI(this.IMAGE_URL)));
                this.stream.addEventListener(Event.COMPLETE,this.onLoaded);
   }
   private function onLoaded(e:Event):void
            {                                
                var bytearray:ByteArray = new ByteArray();    
                this.stream.readBytes(bytearray);
                
                if(this.stream.connected)
                    this.stream.close();
                    
                this.loader.loadBytes(bytearray);
            }
            private function onComplete(e:Event):void
            {
                try
                {
                    this.bmp = this.loader.content as Bitmap;
                    var showImage:Image= new Image();
                    showImage.source=this.loader.content;
                    canvas.addChild(showImage);
                    canvas.setChildIndex(box,1);
                    canvas.setChildIndex(showImage,0);
                }
                catch(e:Error)
                {
                    
                }
            }
   
   //截图，显示缩放选择框
   private function doCapture():void{
    box.x = 100;
    box.y = 100;
    box.visible = true;
   }
   
   //获取缩放选择框内的图像
   private function getImg():BitmapData{
    //截取整个区域
    box.scaleEnable = false;
    var bmp:BitmapData = ImageSnapshot.captureBitmapData(canvas);
    box.scaleEnable = true;
    
    //矩形为要截取区域                
                var re:Rectangle = new Rectangle(box.x+LINE_WIDTH,box.y+LINE_WIDTH,box.boxWidth-LINE_WIDTH,box.boxHeight-LINE_WIDTH); 
                var bytearray:ByteArray = new ByteArray();   
                //截取出所选区域的像素集合                        
                bytearray = bmp.getPixels(re); 
                
                
                var imgBD:BitmapData = new BitmapData(box.boxWidth-LINE_WIDTH,box.boxHeight-LINE_WIDTH);       
                //当前的bytearray.position为最大长度，要设为从0开始读取       
                bytearray.position=0;            
                var fillre:Rectangle = new Rectangle(0,0,box.boxWidth-LINE_WIDTH,box.boxHeight-LINE_WIDTH);
                //将截取出的像素集合存在新的bitmapdata里，大小和截取区域一样
                imgBD.setPixels(fillre,bytearray);
                
                return imgBD;
   }
   
   //预览图片
   private function doScan():void{
    var t:TitleWindow = new TitleWindow();
    t.showCloseButton=true;
    t.addEventListener(CloseEvent.CLOSE,closeWindow);
    t.width = box.boxWidth+t.getStyle("borderThickness");
    t.height =box.boxHeight+t.getStyle("borderThickness")+t.getStyle("headerHeight");
    var img:Image = new Image();
    img.width = box.boxWidth;
    img.height = box.boxHeight; 
    img.source = new Bitmap(getImg());
    t.addChild(img);
    PopUpManager.addPopUp(t,this,true);
    PopUpManager.centerPopUp(t);
   }
   
   private function closeWindow(e:CloseEvent):void{            
                var t:TitleWindow = e.currentTarget as TitleWindow;                    
                PopUpManager.removePopUp(t);                
            }
            
            //保存图片到本地
   private function downloadPicture():void{
    file=new FileReference();
    file.addEventListener(Event.COMPLETE,downloadComplete);
    file.save(new JPEGEncoder(80).encode(getImg()),"default.jpg");
   }
   
   private function downloadComplete(event:Event):void{
    Alert.show("成功保存图片到本地！","提示");
   }
   
   //保存图片到服务器即覆盖原来的图片
   private function save():void{
    Alert.show("是否保存剪切图片？","提示",3, this, function(event:CloseEvent):void {
          if (event.detail==Alert.YES){
           var request:URLRequest = new URLRequest("http://localhost:8080/cutPicuter/servlet/FileManagerSaveFileServlet?realPath="+encodeURIComponent(StringUtil.trim(realPath)));
     request.method=URLRequestMethod.POST;
     request.contentType = "application/octet-stream";
     request.data = new JPEGEncoder(80).encode(getImg());
     var loader:URLLoader = new URLLoader();
     loader.load(request);
     loader.addEventListener(Event.COMPLETE,saveResult);

          }});
   }
   
   private function saveResult(event:Event):void{
    Application.application.reLoadFolderFiles(realPath.substr(0,realPath.lastIndexOf("\\")));
    Alert.show("保存剪切图片成功","提示");
   }
   ]]>
  </ mx:Script >
  < mx:HBox  x ="0"  y ="0" >
         < mx:LinkButton  label ="剪裁"  click ="doCapture();"  icon ="@Embed('assets/cut.png')" />
         < mx:LinkButton  label ="预览"  click ="doScan();"  icon ="@Embed('assets/ok.png')" />
         < mx:VRule  height ="22" />
         < mx:LinkButton  label ="保存"   click ="save()"   icon ="@Embed('assets/save.png')" />
         < mx:LinkButton  label ="另存为"  click ="downloadPicture();"  icon ="@Embed('assets/saveAs.png')" />
     </ mx:HBox >
  < mx:Canvas  id ="canvas"  y ="23"  x ="1" >
  < local:ScaleBox  id ="box"  visible ="false"  y ="0"  x ="0"  width ="100"  height ="100" />
  </ mx:Canvas >
</ mx:Application >

java代码：

package  com;


import  java.io.DataOutputStream;
import  java.io.File;
import  java.io.FileOutputStream;
import  java.io.IOException;
import  java.io.InputStream;

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

/**
 * Servlet implementation class FileManagerSaveFileServlet
  */
public   class  FileManagerSaveFileServlet  extends  HttpServlet {
 
  private   int  len = 0 ; // 处理流
  private   int  mm = 0 ; // 重命名
  private  String fileName = "" ; // 文件原名
  private  String extName = "" ; // 文件扩展名
  private  String tempFileName = "" ; // 文件名加扩展名
 
  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 {
  request.setCharacterEncoding( " utf-8 " );
  String realPath = request.getParameter( " realPath " );
   // System.out.println("FMSFS-->realPath:"+realPath);
  response.setContentType( " application/octet-stream " );
  InputStream is  =  request.getInputStream();
   try  {
   int  size  =   0 ;
   byte [] tmp  =   new   byte [ 100000 ];
  
  tempFileName = realPath.substring(realPath.lastIndexOf( " \\ " ) + 1 ); // 切割获得文件名加扩展名
  fileName = tempFileName.substring( 0 ,tempFileName.lastIndexOf( " . " )); // 切割获得文件名
   // 确保获得真实的文件名如：1(1)可以获得真实为1,
   if (fileName.indexOf( " ( " ) !=- 1 ){
   fileName = fileName.substring( 0 ,fileName.indexOf( " ( " ));
  }
  
  extName = tempFileName.substring(tempFileName.lastIndexOf( " . " )); // 切割获得扩展名
  
   // 调用递归方法
  fileName += reNameFile(realPath.substring( 0 ,realPath.lastIndexOf( " \\ " ) + 1 ),fileName,extName);
   //  创建一个文件夹用来保存发过来的图片；
  File f  =   new  File(realPath.substring( 0 ,realPath.lastIndexOf( " \\ " ) + 1 ) + fileName + extName);
  DataOutputStream dos  =   new  DataOutputStream( new  FileOutputStream(f));
   while  ((len  =  is.read(tmp))  !=   - 1 ) {
  dos.write(tmp,  0 , len);
  size  +=  len;
  }
  dos.flush();
  dos.close();
  }  catch  (IOException e) {
  e.printStackTrace();
  }
 }
 
  // 递归来重命名文件名
 String str = "" ;
  public  String reNameFile(String realPath,String filename,String extName){
  File file  = new  File(realPath + " \\ " + filename + extName);
  str = "" ;
         if (file.exists()){
         mm ++ ;
         str = " _ " + mm;
         reNameFile(realPath,fileName + str,extName);
        } else {
          if (mm != 0 ){
      str = " _ " + mm;
         }
        }
   return  str;
 }
}