maven项目使用commonsfileupload实现文件的上传和下载

编程入门行业动态更新时间:2024-10-28 12:22:39

pom.xml依赖

<dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.4</version>
    </dependency>

jsp页面

<%@ page contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%><html>
<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″>
<%@taglib uri="http://java.sun/jsp/jstl/core" prefix="c" %>
<body>
<h2>Hello</h2>
<!--enctype="multipart/form-data"支持把部分文件上传包裹图片text文档，excel等-->
    <form method="post" action="fileUpload.do" name="fileupload" enctype="multipart/form-data">
        姓名： <input type="file" name="fileupload"></br>
        姓名： <input type="file" name="fileupload"></br>
        <button type="submit">提交</button>
    </form>
<a href="download?fileName=工作簿1.xlsx">下载</a>
<button onclick="download()">下载附件</button>
<script>
    function download() {## 标题
        window.location.href="download?fileName=工作簿1.xlsx"
    }
</script>

Controller类

package com.wcf.controller;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Created by ChaoFeng Cotter on 2020/8/3.
 */
@Controller
public class FileUploadController extends HttpServlet {
   Logger logger= LoggerFactory.getLogger(FileUploadController.class);
   //文件上传
    @RequestMapping("/fileUpload.do")
    //MultipartFile 变量名必须与jsp页面input标签的name属性之相同才可以
    public void fileUpload(HttpServletRequest request,MultipartFile fileupload) throws Exception {
        SimpleDateFormat dateFormat=new SimpleDateFormat("yyyyMMddHHmm");
        String now=dateFormat.format(new Date());
        //String path=request.getSession().getServletContext().getRealPath("WEB-INF/upload/");
        String path="D:";
        String fileName=fileupload.getOriginalFilename();
        String name="seilver"+now+fileName.substring(fileName.lastIndexOf("."));
        File file1=new File(path,name);
        if (!file1.exists()){
            file1.mkdir();
        }
        fileupload.transferTo(file1);
    }
    @RequestMapping("download")
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException, UnsupportedEncodingException {
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        response.addHeader("content-Type", "application/octet-stream");//设置下载的文件的MIME类型
        String fileName = request.getParameter("fileName");
        String path = "D:";//设置要下载的文件在服务器中的目录
        /**
         *解析浏览器类型，设置不同的“content-Disposition”消息头来解决中文乱码问题
         */
        String agent = request.getHeader("User-Agent").toLowerCase();
        String contentDisposition = "attachement;filename="+fileName;
        System.out.println(agent);
        if(agent.contains("edge")) {
            System.out.println("edge");
            contentDisposition = "attachment;filename="+URLEncoder.encode(fileName,"UTF-8");
        }else if(agent.contains("firefox")||agent.contains("opr")||agent.contains("chrome")) {
            contentDisposition = "attachment;filename==?UTF-8?B?"+new String(Base64.encodeBase64(fileName.getBytes("UTF-8")))+"?=";
        }
        response.addHeader("Content-Disposition",contentDisposition);
        //InputStream in = getServletContext().getResourceAsStream(path+fileName);//此种方式只能下载项目根目录中的文件
        /**
         * 通过IO操作将文件输出给用户
         */
        InputStream in = new FileInputStream(path+fileName);
        ServletOutputStream out = response.getOutputStream();
        /*byte[] bs = new byte[10];
        int len = -1;
        while((len=in.read(bs))!=-1) {
            out.write(bs,0,bs.length);
        }
        out.close();
        in.close();*/
        IOUtils.copy(in,out);
    }
}