html里传输文件到后端,前端js上传文件 到后端接收文件

packagecom.zj.sample;importjava.io.File;importjava.io.IOException;importjava.util.Iterator;importjava.util.List;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importorg.apache.commons.fileupload.FileItem;importorg.apache.commons.fileupload.disk.DiskFileItemFactory;importorg.apache.commons.fileupload.servlet.ServletFileUpload;/*** Servlet implementation class Upload*/@WebServlet("/Upload")public class Upload extendsHttpServlet {private static final long serialVersionUID = 1L;private String uploadPath = "D:\\temp"; //上传文件的目录

private String tempPath = "d:\\temp\\buffer\\"; //临时文件目录

File tempPathFile;/***@seeHttpServlet#HttpServlet()*/

publicUpload() {super();//TODO Auto-generated constructor stub

}/***@seeHttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/

protected void doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {//TODO Auto-generated method stub

}/***@seeHttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/@SuppressWarnings("unchecked")public voiddoPost(HttpServletRequest request, HttpServletResponse response)throwsIOException, ServletException {try{//Create a factory for disk-based file items

DiskFileItemFactory factory = newDiskFileItemFactory();//Set factory constraints

factory.setSizeThreshold(4096); //设置缓冲区大小，这里是4kb

factory.setRepository(tempPathFile);//设置缓冲区目录//Create a new file upload handler

ServletFileUpload upload = newServletFileUpload(factory);//Set overall request size constraint

upload.setSizeMax(4194304); //设置最大文件尺寸，这里是4MB

List items = upload.parseRequest(request);//获得全部的文件

Iterator i =items.iterator();while(i.hasNext()) {

FileItem fi=(FileItem) i.next();

String fileName=fi.getName();if (fileName != null) {

File fullFile= newFile(fi.getName());

File savedFile= newFile(uploadPath, fullFile.getName());

fi.write(savedFile);

}

}

System.out.print("upload succeed");

}catch(Exception e) {//能够跳转出错页面

e.printStackTrace();

}

}public void init() throwsServletException {

File uploadFile= newFile(uploadPath);if (!uploadFile.exists()) {

uploadFile.mkdirs();

}

File tempPathFile= newFile(tempPath);if (!tempPathFile.exists()) {

tempPathFile.mkdirs();

}

}

}