flex上传图片 server端servlet存储图片到本地

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Flex

首先下载 commons-fileupload-1.2.1.jar和commons-io-1.1.jar
flex端代码：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
                layout="absolute"
                xmlns="*"
                creationComplete="init();">
    <mx:Script>
        <![CDATA[
            import flash.events.*;

            import mx.controls.Alert;
            import mx.events.CloseEvent;
            import mx.managers.CursorManager;

            private var file:FileReference;
            private var byteArray:ByteArray;
            private var bitmapData:BitmapData;
            private var loader:Loader=new Loader();

            private function init():void
            {
                Security.allowDomain("*");
                file=new FileReference();
                file.addEventListener(Event.COMPLETE, fileReferenceCompleteHandler);
                file.addEventListener(Event.SELECT, fileReferenceSelectHandler);
            }

            //选择上传的图片
            private function choose():void
            {
                var imageTypes:FileFilter=new FileFilter("Images (*.jpg, *.jpeg, *.png)", "*.jpg;*.jpeg;*.png");
                var allTypes:Array=new Array(imageTypes);
                file.browse(allTypes);
//                file.browse();
            }

            private function toUpload():void
            {
                if (bitmapData == null)
                {
                    Alert.show("请您先选择要上传的图片");
                }
                else
                {
                    Alert.show("上传 " + file.name + " (共 " + Math.round(file.size) + " 字节)?", "确认上传", Alert.YES | Alert.NO, null, proceedWithUpload);
                }
            }

            //监听文件上传状态
            private function onProgress(e:ProgressEvent):void
            {
                lbProgress.text=" 已上传 " + e.bytesLoaded + " 字节，共 " + e.bytesTotal + " 字节";
                var proc:uint=e.bytesLoaded / e.bytesTotal * 100;
                bar.setProgress(proc, 100);
                bar.label="当前进度: " + " " + proc + "%";
                if (e.bytesLoaded == e.bytesTotal)
                {
                    CursorManager.removeBusyCursor();
                }
            }

            //上传图片到服务器
            private function proceedWithUpload(e:CloseEvent):void
            {
                if (e.detail == Alert.YES)
                {
                    //进度监听
                    file.addEventListener(ProgressEvent.PROGRESS, onProgress);
                    var request:URLRequest=new URLRequest("http://localhost:8080/FileUploaded");
                    //设置鼠标忙状态
                    CursorManager.setBusyCursor();
                    try
                    {
                        file.upload(request);
                        Alert.show("恭喜你，上传成功");
                    }
                    catch (error:Error)
                    {
                        Alert.show("上传失败");
                        trace("上传失败");
                    }

                }
            }

            //上传完成调用
            private function completeHandle(event:Event):void
            {
                Alert.show("恭喜你，上传成功");
            }

            //载入本地图片
            private function fileReferenceCompleteHandler(e:Event):void
            {
                byteArray=file.data;
                loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loaderCompleteHandler);
                loader.loadBytes(byteArray);
            }

            //图片载入完成显示在预览框中
            private function loaderCompleteHandler(e:Event):void
            {
                var bitmap:Bitmap=Bitmap(loader.content);
                bitmapData=bitmap.bitmapData;
                img.source=bitmap;
            }

            //选择文件动作监听
            private function fileReferenceSelectHandler(e:Event):void
            {
                file.removeEventListener(ProgressEvent.PROGRESS, onProgress);
                file.load();
            }
        ]]>
    </mx:Script>

    <mx:Canvas width="100%"
               height="100%"
               x="10"
               y="170"
               fontSize="15">
        <mx:VBox width="100%"
                 horizontalAlign="center">
            <mx:Label id="lbProgress"
                      text="上传"/>
            <mx:ProgressBar id="bar"
                            labelPlacement="bottom"
                            themeColor="#F20D7A"
                            minimum="0"
                            visible="true"
                            maximum="100"
                            label="当前进度: 0%"
                            direction="right"
                            mode="manual"
                            width="200"/>
            <mx:Button label="上传文件"
                       click="toUpload();"/>
        </mx:VBox>
        <mx:Panel width="469"
                  height="392"
                  verticalGap="0"
                  horizontalAlign="center"
                  verticalAlign="middle"
                  x="408"
                  y="129"
                  layout="absolute">
            <mx:Button label="选择文件"
                       click="choose();"
                       x="178"
                       y="9"/>
            <mx:Image id="img"
                      width="400"
                      height="300"
                      x="36"
                      y="44"/>

        </mx:Panel>

    </mx:Canvas>
</mx:Application>

java servlet端代码

package upload;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;

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

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

/**
* @author lqw
*/
public class FileUploaded extends HttpServlet {

    // 定义文件的上传路径
    private String uploadPath = "d:\\a\\";

    // 限制文件的上传大小
    private int maxPostSize = 100 * 1024 * 1024;

    public FileUploaded() {
        super();
    }

    public void destroy() {
        super.destroy();
    }

    protected void processRequest(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        System.out.println("to upload picture !");
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();

        // 保存文件到服务器中

        DiskFileItemFactory factory = new DiskFileItemFactory();
        factory.setSizeThreshold(4096);
        ServletFileUpload upload = new ServletFileUpload(factory);
        upload.setSizeMax(maxPostSize);
        try {
            List fileItems = upload.parseRequest(request);
            Iterator iter = fileItems.iterator();
            while (iter.hasNext()) {
                FileItem item = (FileItem) iter.next();
                if (!item.isFormField()) {
                    String name = item.getName();
                    System.out.println(name);
                    try {
                        item.write(new File(uploadPath + name));
                        // SaveFile s = new SaveFile();
                        // s.saveFile(name);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        } catch (FileUploadException e) {
            e.printStackTrace();
            System.out.println(e.getMessage() + "结束");
        }
    }

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        processRequest(request, response);
    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        processRequest(request, response);
    }

    public String getServletInfo() {
        return "Short description";
    }

}

web.xml 文件内容：
<?xml version = '1.0' encoding = 'windows-1252'?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee">

     <servlet>
        <servlet-name>FileUploaded</servlet-name>
        <servlet-class>upload.FileUploaded</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>FileUploaded</servlet-name>
        <url-pattern>/FileUploaded</url-pattern>
    </servlet-mapping>

    <session-config>
        <session-timeout>35</session-timeout>
    </session-config>
    <mime-mapping>
        <extension>html</extension>
        <mime-type>text/html</mime-type>
    </mime-mapping>
    <mime-mapping>
        <extension>txt</extension>
        <mime-type>text/plain</mime-type>
    </mime-mapping>

</web-app>

FLEX端如果出现安全沙箱的问题:是由于在tomcat环境下没有声明应用程序能被外部访问.

在程序的部署文件夹下添加crossdomain.xml文件.文件内容为:
<?xml version="1.0"?>

<!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">

<cross-domain-policy>

<allow-access-from domain="*" secure="false"/>
<allow-http-request-headers-from domain="*" headers="*" secure="false"/>

</cross-domain-policy>