jsp上传文件页面报无法解析的编译问题

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>

带进度条的文件上传

//此处需要加&nocache="+new Date().getTime()，否则将出现进度不更新的情况 function getProgress(){ var loader=new net.AjaxRequest("showProgress.jsp?nocache="+new Date().getTime(),deal_p,onerror,"GET"); } function onerror(){ alert("上传文件出错！"); } function deal_p(){ var h=this.req.responseText; h=h.replace(/\s/g,""); //去除字符串中的Unicode空白符 document.getElementById("progressPercent").style.display=""; //显示百分比 progressPercent.innerHTML=h+"%"; //显示完成的百分比 document.getElementById("progressBar").style.display="block"; //显示进度条 document.getElementById("imgProgress").width=h*(255/100); //显示完成的进度 } function deal(form){ form.submit(); //提交表单 timer=window.setInterval("getProgress()",500); //每隔500毫秒获取一次上传进度 }

请选择上传的文件： 注：文件大小请控制在50M以内。  0%

upload.java

package com.wgh.servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import java.io.InputStream;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

/**

• @author administrator
  */
  public class UpLoad extends HttpServlet {

  public void doPost(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {
  String action = request.getParameter("action");
  if ("uploadFile".equals(action)) {
  this.uploadFile(request, response); // 上传文件
  }
  }

  public void uploadFile(HttpServletRequest request,
  HttpServletResponse response) throws ServletException, IOException {
  response.setContentType("text/html;charset=GBK");
  request.setCharacterEncoding("GBK");
  HttpSession session = request.getSession();
  session.setAttribute("progressBar", 0); // 定义指定上传进度的Session变量
  String error = "";
  int maxSize = 50 * 1024 * 1024; // 单个上传文件大小的上限
  DiskFileItemFactory factory = new DiskFileItemFactory(); // 基于磁盘文件项目创建一个工厂对象
  ServletFileUpload upload = new ServletFileUpload(factory); // 创建一个新的文件上传对象
  try {
  List items = upload.parseRequest(request);// 解析上传请求
  Iterator itr = items.iterator();// 枚举方法
  while (itr.hasNext()) {
  FileItem item = (FileItem) itr.next(); // 获取FileItem对象
  if (!item.isFormField()) {// 判断是否为文件域
  if (item.getName() != null && !item.getName().equals("")) {// 判断是否选择了文件
  long upFileSize = item.getSize(); // 上传文件的大小
  String fileName = item.getName(); // 获取文件名
  // System.out.println("上传文件的大小:" + item.getSize());
  if (upFileSize > maxSize) {
  error = "您上传的文件太大，请选择不超过50M的文件";
  break;
  }
  // 此时文件暂存在服务器的内存中
  File tempFile = new File(fileName);// 构造临时对象
  // String savePath=tempFile.getName();
  // //返回上传文件在客户端的完整路径名称
  // request.setAttribute("filename", savePath);
  File file = new File(request.getRealPath("/upload"),
  tempFile.getName()); // 获取根目录对应的真实物理路径

                  InputStream is = item.getInputStream();
                  int buffer = 1024; // 定义缓冲区的大小
                  int length = 0;
                  byte[] b = new byte[buffer];
                  double percent = 0;
                  FileOutputStream fos = new FileOutputStream(file);
                  while ((length = is.read(b)) != -1) {
                      percent += length / (double) upFileSize * 100D; // 计算上传文件的百分比
                      fos.write(b, 0, length); // 向文件输出流写读取的数据
                      session.setAttribute("progressBar", Math
                              .round(percent)); // 将上传百分比保存到Session中
                  }
                  fos.close();
                  Thread.sleep(1000); // 线程休眠1秒
              } else {
                  error = "没有选择上传文件！";
              }
          }
      }
  } catch (Exception e) {
      e.printStackTrace();
      error = "上传文件出现错误：" + e.getMessage();
  }
  if (!"".equals(error)) {
      request.setAttribute("error", error);
      request.getRequestDispatcher("error.jsp")
              .forward(request, response);
  } else {
      request.setAttribute("result", "文件上传成功！");
      request.getRequestDispatcher("upFile_deal.jsp").forward(request,
              response);
  }
  

  }
  }

问题
java.lang.Error: 无法解析的编译问题：
无法解析导入 org.apache.commons.fileupload.disk
无法解析导入 org.apache.commons.fileupload.servlet
DiskFileItemFactory 无法解析为类型
DiskFileItemFactory 无法解析为类型
ServletFileUpload 无法解析为类型
ServletFileUpload 无法解析为类型

com.wgh.servlet.UpLoad.<init>(UpLoad.java:15)
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.lang.reflect.Constructor.newInstance(Constructor.java:423)
java.lang.Class.newInstance(Class.java:442)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:879)
org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:610)
org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1777)
java.lang.Thread.run(Thread.java:745)
求救

http://www.cnblogs.com/xdp-gacl/p/3951172.html

我也刚刚遇到你的这个问题，是由Dyanmic Web Project版本问题造成的，新建项目选择2.5版本将代码原封不动码进去即可成功运行。