flex java red5,使用 Flex 和Java servlets 將文件上傳到 RED5 服務器的步驟

- 日理万妓 2023-01-15 04:55 18阅读 0赞

使用 Flex 和Java servlets 將文件上傳到 RED5 服務器的步驟

UploadToRed5Proj.mxml 源代碼如下：

import mx.collections.ArrayCollection;

import mx.controls.Alert;

\[Bindable\]private var fileReference:FileReference;

\[Bindable\]private var fileSelected:Boolean = false;

\[Bindable\]private var serverUrl:String = "http://localhost:5080/Red5FileUploadProj/fileupload";

private var statusArray:Array = new Array();

\[Bindable\]private var statusArrayCollection:ArrayCollection = new ArrayCollection();

private function doInit():void

fileReference = new FileReference();

fileReference.addEventListener(Event.SELECT, onFileSelect);

fileReference.addEventListener(Event.COMPLETE, onUploadComplete);

fileReference.addEventListener(ProgressEvent.PROGRESS,onUploadProgress);

fileReference.addEventListener(IOErrorEvent.IO\_ERROR, onUploadError);

fileReference.addEventListener(SecurityErrorEvent.SECURITY\_ERROR, onUploadError);

private function browseFile(event:MouseEvent):void

fileReference.browse();

private function onFileSelect(event:Event):void

fileSelected = true;

fileTxt.text = fileReference.name;

statusArray.push(\{status:"Ready to upload "+fileTxt.text\});

statusArrayCollection = new ArrayCollection(statusArray);

private function uploadFile(event:MouseEvent):void

if (!fileSelected || (urlTxt.text.length == 0))

Alert.show("Select a file and Enter a URL");

return;

var urlRequest:URLRequest = new URLRequest(urlTxt.text);

fileReference.upload(urlRequest);

private function onUploadProgress(event:ProgressEvent):void

statusArray.push(\{status:"In progress.."+((event.bytesLoaded \* 100) / event.bytesTotal).toString()+"%"\});

statusArrayCollection = new ArrayCollection(statusArray);

private function onUploadComplete(event:Event):void

statusArray.push(\{status:"Uploaded successfully!"\});

statusArrayCollection = new ArrayCollection(statusArray);

private function onUploadError(event:Event):void

if (event is IOErrorEvent)

statusArray.push(\{status:"IO Error: "+(event as IOErrorEvent).text.toString()\});

statusArrayCollection = new ArrayCollection(statusArray);

else if (event is SecurityErrorEvent)

statusArray.push(\{status:"Security Error: "+(event as IOErrorEvent).text.toString()\});

statusArrayCollection = new ArrayCollection(statusArray);

\]\]>

服務器端的 Java Servlet 代碼使用一個 Apache 的第三方類庫 Commons FileUpload 包，它可以使我們的 servlets 或者 web 應用程序具有上傳的功能。這個包可以從這里進行下載：

http://commons.apache.org/fileupload/。Commons FileUpload 包內部使用了 Apache Commons IO 包，所以我們把這個包也下下來：

http://commons.apache.org/io/。在本文的例子中，我使用的是 commons-fileupload-1.2.1.jar 和 commons-io-1.4.jar。將 commons-fileupload-1.2.1.jar、commons-io-1.4.jar 和 servlet-api.jar 復制到 RED5 項目的 /WEB-INF/lib 目錄下。其中 servlet-api.jar 可以去 tomcat 安裝目錄下的 lib 文件夾下去找。

然后，在我們的 RED5 應用程序的 web.xml 文件夾下添加如下內容：

fileuploadcom.mycompany.ind.red5.FileUploadServletuploadFolderuploadsfileupload/fileupload

如果你熟悉 JEE，你會發現和 tomcat 的 web.xml 配置基本一致：servlet-mapping 元素將匹配 /fileupload 的 url 到名為 "fileupload" 的 servlet，servlet 元素則指示出該 servlet 具體實現類；上傳的文件夾名作為 servlet 的初始參數也在這里進行定義，這里定義為 "uploads"，所以應該在我們的 RED5 項目根目錄下創建一個同名文件夾。

最后，寫具體實現上傳的 FileUploadServlet 類：

package com.mycompany.ind.red5;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.FileItemFactory;import org.apache.commons.fileupload.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import java.io.IOException;import java.util.Iterator;import java.util.List;import java.io.FileOutputStream;import java.io.FileNotFoundException;public class FileUploadServlet extends HttpServlet\{ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException \{ super.doGet(request, response); doPost(request,response); \} @Override public void doPost( HttpServletRequest request, HttpServletResponse response ) \{ /\*\* \* Create a factory for new disk-based file items \*/ FileItemFactory factory = new DiskFileItemFactory(); /\*\* \* Create a new file upload handler \*/ ServletFileUpload upload = new ServletFileUpload(factory); try \{ /\*\* \* Parsing input request \*/ List items = upload.parseRequest(request); /\*\* \* Process the uploaded items \*/ Iterator iter = items.iterator(); while (iter.hasNext()) \{ FileItem item = (FileItem) iter.next(); /\*\* \* handling a normal form-field \*/ if (item.isFormField()) \{ System.out.println("A form field"); \} else \{ /\*\* \* handling file uploads \*/ System.out.println("Not a form field"); String uploadFileName = item.getName(); byte\[\] data = item.get(); /\*\* \* Gets directory to which the file is to be uploaded \*/ String uploadFolder = getServletConfig().getInitParameter("uploadFolder"); String fileFolderName = getServletContext().getRealPath(uploadFolder + "\\\\"+uploadFileName); try \{ FileOutputStream fileOutSt = new FileOutputStream(fileFolderName); try \{ fileOutSt.write(data); fileOutSt.close(); \} catch(IOException exception) \{ exception.printStackTrace(); \} \} catch(FileNotFoundException exception) \{ exception.printStackTrace(); \}\} \} \} catch(FileUploadException exception) \{ exception.printStackTrace(); \} \}\}

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