Flex + Servlet 上传文件

引言：首先声明一下，这篇文章中的内容多是来自于网上，由于自己又整合了一下，Flex 页面：
FileUpload. mxml
<?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);
}

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/SchoolSystem-war/FileUploadServlet");
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>

Servlet 页面：
FileUpload. java
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;

public class FileUploadServlet extends HttpServlet {

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

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

public FileUploadServlet() {
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.">

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";
}
// </editor-fold>
}

虽然只引入了fileupload包 不过要想实际运行还要在工程里添加commons-io包,不然无法上传

因为使用的是apache的fileupload包，实际测试中在tomcat下可以正常使用，在jboss上则报错无法上传，为解决次问题，特别写了一个jsp文件并使用了smartupload上传组件，这样可以在jboss实现flex上传

评论

1 楼 王慧迪 2010-08-27  

你的SaveFile 好像不能用诶