html里传输文件到后端,前端js上传文件到后端接收文件

超、凢脫俗 2022-10-06 11:48 214阅读 0赞

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);