flex+struts2上传文件

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2011-11-23 20:25 1635人阅读评论(1)收藏举报

strutsflexfunctionfilenullstring

刚刚终于解决了flex+struts2上传文件的问题，泪奔。。。。。。。。

都是从网上找来的，勿喷

先看下，flex文件：

<?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.net.FileReference;
       import mx.controls.Alert;
       import mx.events.CloseEvent;
       import flash.events.*;

       private var file: FileReference;

       private function init(): void
       {
           Security.allowDomain("*");
           file = new FileReference();
           file.addEventListener(ProgressEvent.PROGRESS, onProgress);
           file.addEventListener(Event.SELECT, onSelect);
           file.addEventListener(Event.COMPLETE, completeHandle);
       }

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

       private function upload(): void
       {
           var imageTypes:FileFilter = new FileFilter("Videos (*.mov,*.rmvb,*.flv)", "*.mov;*.rmvb;*.flv");
           var allTypes:Array = new Array(imageTypes);
           file.browse(allTypes);
           file.browse();
       }
       private function onSelect(e: Event): void
       {
           Alert.show("上传 " + file.name + " (共 "+Math.round(file.size)+" 字节)?",
           "确认上传",
           Alert.YES|Alert.NO,
           null,
           proceedWithUpload);
       }

       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 + "%";
       }

       private function proceedWithUpload(e: CloseEvent): void
       {
           if (e.detail == Alert.YES)
           {
               var request: URLRequest = new URLRequest("FileUpload");
               request.contentType="multipart/form-data";
               try {
                   file.upload(request);
               }
               catch (error:Error)
               {
                   trace("上传失败");
               }

           }
       }
   ]]>
   </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"
                       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="upload();"/>
       </mx:VBox>
   </mx:Canvas>
</mx:Application>

这个貌似网上很多的，不多说了的。

然后是比较关键的action文件：

public String flexUpLoadFile()
   {
       MultiPartRequestWrapper multiWrapper =
           (MultiPartRequestWrapper) ServletActionContext.getRequest();
       Enumeration fileParameterNames = multiWrapper.getFileParameterNames();
       while (fileParameterNames != null && fileParameterNames.hasMoreElements())
       {
            // get the value of this input tag
            String inputName = (String) fileParameterNames.nextElement();

            // get the content type
            String[] contentType = multiWrapper.getContentTypes(inputName);

            if (isNonEmpty(contentType)) {
                // get the name of the file from the input tag
                String[] fileName = multiWrapper.getFileNames(inputName);

                if (isNonEmpty(fileName)) {
                    // Get a File object for the uploaded File
                    File[] files = multiWrapper.getFiles(inputName);
                    if (files != null) {
                        for (int index = 0; index < files.length; index++) {
                            String uploadPath = "D:\\"+fileName[index];
                            File dstFile = new File(uploadPath);
                            this.copy(files[index], dstFile);
                        }
                    }
                }
            }
        }
       return null;
   }

    private void copy(File src, File dst) {
        InputStream in = null;
        OutputStream out = null;

        try {
            in = new BufferedInputStream(new FileInputStream(src), UserUtil.BUFFER_SIZE);
            out = new BufferedOutputStream(new FileOutputStream(dst),
                    UserUtil.BUFFER_SIZE);
            byte[] buffer = new byte[UserUtil.BUFFER_SIZE];
            int len = 0;
            while ((len = in.read(buffer)) > 0) {
                out.write(buffer, 0, len);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (null != in) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != out) {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    private static boolean isNonEmpty(Object[] objArray) {
        boolean result = false;
        for (int index = 0; index < objArray.length && !result; index++) {
            if (objArray[index] != null) {
                result = true;
            }
        }
        return result;
    }

struts.xml部分：

<action name="FileUpload" class="com.shangdyu.action.VideoAction" method="flexUpLoadFile">
<result>/UpLoad.jsp</result>
</action>

flexUpLoadFile这个函数貌似比较关键，我试过很多的版本都不行，这边可能是这个函数起的作用，先记录下来吧。

MultiPartRequestWrapper multiWrapper =
(MultiPartRequestWrapper) ServletActionContext.getRequest();
Enumeration fileParameterNames = multiWrapper.getFileParameterNames();

它接收到了从flex传过来的文件的内容。

这个真的搞了好久，原来想用blazeds传送文件，但是经过尝试后发现，简直是白痴。struts2果然很强，不管什么都会拦截，然后就会出现说action没有定义的错误，弄得要跳楼了的。原来想自定义拦截器，但是头晕晕的，也不知道行不行，就没弄。

后来几经波折，在网上找到了一篇提问的文章，也是说这个话题。原来没仔细看，篇幅很长，到后面才说问题解决了的。研究了下，果然可以，目前幸福中，哈哈。

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