如何在服务器端 读取Ext.ux.UploadDialog上传的文件？

问题已经解决。
1。要导入 commons.io.jar包。
2。upload.js调用 Ext.ux.UploadDialog时候，url属性要包含项目名。
3. DiskFileUpload fu = new DiskFileUpload();  
确实已经废弃，建议使用：
DiskFileItemFactory factory = new DiskFileItemFactory();

ServletFileUpload upload = new ServletFileUpload(factory);

import java.io.File;
import java.io.IOException;
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.DiskFileUpload;
import org.apache.commons.fileupload.FileItem;
public class UpFileServlet extends HttpServlet {
    private String uploadPath="c:\\Upfile\\"; // 上传文件的目录
    private String tempPath="c:\\upfiel"; // 临时文件目录

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
                doPost(request,response);
    }


    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try {
            DiskFileUpload fu = new DiskFileUpload();
            // 设置最大文件尺寸，这里是4MB
            fu.setSizeMax(4194304);
            // 设置缓冲区大小，这里是4KB
            fu.setSizeThreshold(4096);
            // 设置临时目录：
            fu.setRepositoryPath(tempPath);

            // 得到所有的文件：
            List fileItems = fu.parseRequest(request);
            Iterator i = fileItems.iterator();
            // 依次处理每一个文件：
            while(i.hasNext()) {
                FileItem fi = (FileItem)i.next();
                // 获得文件名，这个文件名包括路径：
                String fileName = fi.getName();
                int start=fileName.lastIndexOf("\\");
                //获得上传的文件名
                String paths=fileName.substring(start+1, fileName.length());
                fi.write(new File(uploadPath+paths));
            }
            response.getWriter().write("{'success':true,'message':'文件上传成功'}");
        }
        catch(Exception e) {
            System.out.println(e.getMessage()+" : "+e.getCause());
            response.getWriter().write("{'success':false,'message':error...'}");
        }
    }


    public void init() throws ServletException {
            // 文件夹不存在就自动创建!
            if(!new File(uploadPath).isDirectory())
                new File(uploadPath).mkdirs();
            if(!new File(tempPath).isDirectory())
                new File(tempPath).mkdirs();
    }
}