控制台没有输出，上传的文件也不在路径中

package com.imooc.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 {

// 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，获取每个部分的对象

for(FileItem fileItem : list) {

// 5. 判断是普通项还是文件上传项

if(fileItem.isFormField()) {

// 普通项

// 获取普通项的名称：

String name = fileItem.getFieldName();

// 获取普通项的值:

String value = fileItem.getString("UTF-8");

System.out.println(name + ":" + value);

}else {

// 文件上传项

// 获取文件名称：

String fileName = fileItem.getName();

// 获取文件的输入流：

InputStream is = fileItem.getInputStream();

// 需要将文件写入到服务器的某个路径：

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) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

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

doGet(request, response);

}

}