fileupload实现文件上传

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mb5ff981a16d1dd 2020-05-08 09:10:00

文章标签 java html apache 临时文件文件名 文章分类 Java 后端开发

文件上传需要使用阿帕奇基金会提供的

commons-fileupload-1.3.1.jar

commons-io-2.4.jar

两个jar包

servlet代码

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packagecom.yellow.web.servlet;

importorg.apache.commons.fileupload.FileItem;importorg.apache.commons.fileupload.FileUploadException;importorg.apache.commons.fileupload.disk.DiskFileItemFactory;importorg.apache.commons.fileupload.servlet.ServletFileUpload;

importjavax.servlet.ServletContext;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importjava.io.File;importjava.io.IOException;importjava.time.LocalDate;importjava.util.List;importjava.util.UUID;

@WebServlet("/upload")publicclassUploadServlet extendsHttpServlet {

@Override protectedvoiddoGet(HttpServletRequest req, HttpServletResponse resp) throwsServletException, IOException { this.doPost(req, resp); }

@Override protectedvoiddoPost(HttpServletRequest req, HttpServletResponse resp) throwsServletException, IOException { booleanmultipartContent = ServletFileUpload.isMultipartContent(req); if(multipartContent){ DiskFileItemFactory factory = newDiskFileItemFactory();

//设置临时文件的路径，以及开启临时文件的大小 //1MB就开启 factory.setSizeThreshold(1024*1024); //获取临时文件路径 String temp = req.getServletContext().getRealPath("/temp"); System.out.println("temp = "+ temp); File temppath = newFile(temp); if(!temppath.exists()){ //如果不存在创建 temppath.mkdirs(); } factory.setRepository(temppath); ServletFileUpload sfu = newServletFileUpload(factory);

try{ List<FileItem> items = sfu.parseRequest(req); for(FileItem item : items) { if(!item.isFormField()){ //说明讲就是文件上传 //获取文件名 String fileName = item.getName(); //截取非法文件名称 fileName=fileName.substring(fileName.lastIndexOf("\\")+1); //使用UUID加密,方式文件名称重复 fileName=UUID.randomUUID()+"_"+ fileName; //设置文件以日期子目录来存储 LocalDate ld = LocalDate.now(); //获取年月日 intyear = ld.getYear(); intmonth = ld.getMonthValue(); intday = ld.getDayOfMonth(); //设置文件的上传名称 String upload=req.getServletContext().getRealPath("/upload"); upload=upload+"/"+year+"/"+month+"/"+day; System.out.println("upload = "+ upload); File uploadpath = newFile(upload); if(!uploadpath.exists()){ //创建 uploadpath.mkdirs(); } File uploadFile = newFile(uploadpath,fileName); System.out.println("uploadFile = "+ uploadFile.getAbsolutePath()); if(!uploadFile.exists()){ uploadFile.createNewFile(); }

item.write(uploadFile); } //设置手动删除临时文件 item.delete();

} } catch(Exception e) { e.printStackTrace(); } }

jsp代码-------------------[mw_shl_code=html,true]<%@ page contentType="text/html;charset=UTF-8"language="java"%><!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body><form action="${pageContext.request.contextPath}/upload"enctype="multipart/form-data"method="post"> <input type="file"name="photo"><br> <input type="submit"value="上传"></form></body></html>