commons-fileupload实现文件按日期进行存储带缓存
Posted gaohuanhuan
tags:
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JSP
1 <%-- 2 Created by IntelliJ IDEA. 3 User: Ghh 4 Date: 2019/9/1 5 Time: 14:27 6 To change this template use File | Settings | File Templates. 7 --%> 8 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 9 <html> 10 <head> 11 <title>文件上传</title> 12 </head> 13 <body> 14 <form action="$pageContext.request.contextPath/uploadServlet" method="post" enctype="multipart/form-data"> 15 <input type="file" name="image" id="image"><br> 16 <input type="submit" value="上传"> 17 </form> 18 </body> 19 </html>
Servlet
package com.ghh.upload;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
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.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.util.List;
import java.util.UUID;
/**
* @author Ghh
* @date 2019/9/1 14:32
* @Description
*/
@WebServlet(name = "UploadServlet",urlPatterns = "/uploadServlet")
public class UploadServlet extends HttpServlet
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
doGet(request,response);
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
InputStream is = null;
FileOutputStream fileOutputStream = null;
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if(!isMultipart)
throw new RuntimeException("该请求不支持文件上传");
DiskFileItemFactory itemFactory = new DiskFileItemFactory();
//设置上传文件大于3M会启动临时文件目录
itemFactory.setSizeThreshold(1024*1024*3);
//指定临时文件存储目录
String tempPath = this.getServletContext().getRealPath("/temp");
System.out.println("tempPath = " + tempPath);
File temp = new File(tempPath);
if(!temp.exists())
temp.mkdirs();
itemFactory.setRepository(temp);
ServletFileUpload servletFileUpload = new ServletFileUpload(itemFactory);
try
List<FileItem> fileItems = servletFileUpload.parseRequest(request);
for (FileItem fileItem : fileItems)
if(fileItem.isFormField())
//普通字段
String fieldName = fileItem.getFieldName();
String fileValue = fileItem.getString("UTF-8");
System.out.println(fieldName+"===="+fileValue);
else
String fileName = fileItem.getName();
String suffer = fileName.substring(fileName.lastIndexOf("."));
UUID uuid = UUID.randomUUID();
fileName = uuid+suffer;
System.out.println("fileName = " + fileName);
//获取输入流
is = fileItem.getInputStream();
//创建输出流
String path = this.getServletContext().getRealPath("/upload");
//根据年月日创建多级目录
LocalDate now = LocalDate.now();
int year = now.getYear();
int month = now.getMonthValue();
int day = now.getDayOfMonth();
path = path+File.separator+year+File.separator+month+File.separator+day;
System.out.println("path = " + path);
//创建父目录
File parentDir = new File(path);
if(!parentDir.exists())
parentDir.mkdirs();
File file = new File(path,fileName);
fileOutputStream = new FileOutputStream(file);
byte[] bytes = new byte[1024];
int len = -1;
while ((len = is.read(bytes))!=-1)
fileOutputStream.write(bytes,0,len);
fileItem.delete();
catch (FileUploadException e)
e.printStackTrace();
finally
try
is.close();
fileOutputStream.close();
catch (Exception e)
e.printStackTrace();
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