fileupload实现文件上传

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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package com.yellow.web.servlet;   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;   import javax.servlet.ServletContext; 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 java.io.File; import java.io.IOException; import java.time.LocalDate; import java.util.List; import java.util.UUID;   @WebServlet("/upload") public class UploadServlet extends HttpServlet {       @Override     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        this.doPost(req, resp);     }       @Override     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {         boolean multipartContent = ServletFileUpload.isMultipartContent(req);         if(multipartContent){             DiskFileItemFactory factory = new DiskFileItemFactory();               //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 = new File(temp);             if(!temppath.exists()){                 //如果不存在创建                 temppath.mkdirs();             }             factory.setRepository(temppath);             ServletFileUpload sfu = new ServletFileUpload(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                         int year = ld.getYear();                         int month = ld.getMonthValue();                         int day = 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 = new File(upload);                         if(!uploadpath.exists()){                             //创建                             uploadpath.mkdirs();                         }                         File uploadFile = new File(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>

    }
}
[/mw_shl_code]servlet代码
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