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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[Java] 纯文本查看 复制代码 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
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[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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