Flex上传下载组件
Flex Java 上传 下载 组件 收藏
事前准备就是到http://commons.apache.org下载common-fileupload-1.1.1.jar以及common-io-1.2.jar两个包。
前台Flex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.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("Images (*.jpg, *.jpeg, *.png)", "*.jpg;*.jpeg;*.png");
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("http://localhost:8080/FileUploaded/FileUploaded");
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" 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="upload();"/>
</mx:VBox>
</mx:Canvas>
</mx:Application>
http://localhost:8080/FileUploaded/FileUploaded就是你自己写的servlet的路径了。
接下来写的是Java Servlet:
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 crystal
*/
public class FileUploaded extends HttpServlet {
??? /**
????? * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
????? * @param request servlet request
????? * @param response servlet response
????? */
??? // 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("Access !");
???????? 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");
??????? }
??? }
??? // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
??? /**
????? * Handles the HTTP <code>GET</code> method.
????? * @param request servlet request
????? * @param response servlet response
????? */
??? protected void doGet(HttpServletRequest request, HttpServletResponse response)
??????????? throws ServletException, IOException {
???????? processRequest(request, response);
??? }
??? /**
????? * Handles the HTTP <code>POST</code> method.
????? * @param request servlet request
????? * @param response servlet response
????? */
??? protected void doPost(HttpServletRequest request, HttpServletResponse response)
??????????? throws ServletException, IOException {
???????? processRequest(request, response);
??? }
??? /**
????? * Returns a short description of the servlet.
????? */
??? public String getServletInfo() {
??????? return "Short description";
??? }
??? // </editor-fold>
}
如果使得你的Servlet被访问，你还需要在WEB-INF/web.xml 添加如下的xml语句：[在<web-app>中]
<!-- For file uploaded -->
?? <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>
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/zhao2271394/archive/2009/09/18/4560936.aspx
