老师帮我看看哪里出错了

来源：3-4 文件上传代码的实现

慕UI5285863

2019-09-08 00:00:11

package com.i.servlet;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
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;

@WebServlet("/UploadServlet")
public class UploadServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		

	}

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//1.创建磁盘文件项工厂
		DiskFileItemFactory diskFileItemFactory=new DiskFileItemFactory();
		//2.创建核心解析类
		ServletFileUpload fileUpload=new ServletFileUpload(diskFileItemFactory);
		//3.解析请求对象，将请求分成几个部分(FileItem)
		try {
			List<FileItem> list=fileUpload.parseRequest(request);
			//4.遍历集合获得每个部分的对象
			for(FileItem fileItem:list) {
				//判断是普通项还是文件上传项
				if(fileItem.isFormField()) {
					//普通项
					//获得普通项的名称
					String name=fileItem.getFieldName();
					//获得普通项的值
					String value=fileItem.getString("utf-8");
					System.out.println(name+" "+value);
				}else {
					//文件上传项
					//获得文件的名称:
					String fileName=fileItem.getName();
					//获得文件的输入流
					InputStream is=fileItem.getInputStream();
					//需要将文件写入到服务器的某个路径即可:
					String path=getServletContext().getRealPath("/upload");
					System.out.println(path);
					//创建输出流与输入流进行对接：
					OutputStream os=new FileOutputStream(path+"\\"+fileName);
					int len=0;
					byte[] b=new byte[1024];
					while((len=is.read(b))!=-1) {
						os.write(b, 0, len);
					}
					is.close();
					os.close();
				}
			}
		} catch (FileUploadException e) {
			e.printStackTrace();
		}
	}

}

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<h1>文件上传</h1>
<form action="${pageContext.request.contextPath()}/UploadServlet" method="post" enctype="multipart/form-data">
<input type="text" name="ok"><br/>
<input type="file" name="upload"><br/>
<input type="submit" value="上传">
</form>
</body>
</html>

不能正常打开http://localhost:8080/upload/upload.jsp，显示500错误，劳烦老师帮我检查一下看哪里错了

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