Flex+java实现文件上传

用了两天时间学习了下Flex和java配合实现文件上传，找了个小例子。前端当然是flex，后台使用servlet，把代码贴上来，备忘吧：
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;
@SuppressWarnings("serial")
public class FileUpload extends HttpServlet
{
//定义文件上传的路径
private String uploadPath = "d:\\a\\";

private int maxPostSize = 100*1024*1024;
public FileUpload()
{
super();
}
public void destroy()
{
super.destroy();
}

@SuppressWarnings("unchecked")
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();
out.print("已连接上!");

//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));
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
}
catch(FileUploadException e)
{
e.prin