spring boot实现文件上传下载以及多文件上传

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首先是很简单的界面，在resource/static下创建文件file.html
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3"><head>    <title>Hello World!</title></head><body><form method="POST" enctype="multipart/form-data" action="/upload">    <p>文件：<input type="file" name="file" /></p>    <p><input type="submit" value="上传" /></p></form><br><br><br><form method="POST" enctype="multipart/form-data" action="/batch/upload">    <p>文件1：<input type="file" name="file" /></p>    <p>文件2：<input type="file" name="file" /></p>    <p>文件3：<input type="file" name="file" /></p>    <p><input type="submit" value="上传" /></p></form><br><br><br><a href="/fileDownload">下载</a></body></html>




//然后是controller层
package com.example.myproject.web;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.multipart.MultipartFile;import org.springframework.web.multipart.MultipartHttpServletRequest;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.*;import java.util.List;/** * Created by lenovo on 2017/4/27. */@Controllerpublic class FileController {    /**     * 文件上传具体实现方法;     * @param file     * @return     */    @RequestMapping("/upload")    @ResponseBody    public String handleFileUpload(@RequestParam("file")MultipartFile file){        if(!file.isEmpty()){            try {                String fileName = file.getOriginalFilename();                BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(new File("F:\\files\\" + fileName)));                out.write(file.getBytes());                out.flush();                out.close();            } catch (FileNotFoundException e) {                e.printStackTrace();                return"上传失败,"+e.getMessage();            } catch (IOException e) {                e.printStackTrace();                return"上传失败,"+e.getMessage();            }            return"上传成功";        }else{            return"上传失败，因为文件是空的.";        }    }    @RequestMapping(value = "/fileDownload")    @ResponseBody        public String download(HttpServletResponse response) throws Exception {            BufferedInputStream bis = null;            BufferedOutputStream bos = null;            //获取下载文件露肩            String downLoadPath = "F:\\迅雷下载\\day13\\avi\\13.01_常见对象(StringBuffer的概述).avi";            /*response.setHeader("content-type", "application/octet-stream");            //获取文件的长度            long fileLength = new File(downLoadPath).length();            //设置文件输出类型            response.setContentType("application/octet-stream");            //设置输出长度            response.setHeader("Content-Length", String.valueOf(fileLength));*/        /********************************************************************/            //获取输入流            bis = new BufferedInputStream(new FileInputStream(downLoadPath));            //输出流            bos = new BufferedOutputStream(new FileOutputStream(new File("F:\\1.avi")));            byte[] buff = new byte[2048];            int bytesRead;            while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {                bos.write(buff, 0, bytesRead);            }            //关闭流            bis.close();            bos.close();        return "下载成功";    }    @RequestMapping(value="/batch/upload", method= RequestMethod.POST)    @ResponseBody    public String handleFileUpload(HttpServletRequest request){        List<MultipartFile> files = ((MultipartHttpServletRequest)request).getFiles("file");        MultipartFile file = null;        BufferedOutputStream stream = null;        for (int i =0; i< files.size(); ++i) {            file = files.get(i);            if (!file.isEmpty()) {                try {                   BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(new File("F:\\files\\" + file.getOriginalFilename())));                   bufferedOutputStream.write(file.getBytes());                   bufferedOutputStream.flush();                   bufferedOutputStream.close();                } catch (Exception e) {                    return "You failed to upload " + i + " => " + e.getMessage();                }            } else {                return "You failed to upload " + i + " because the file was empty.";            }        }        return "上传成功";    }}


//我们要设置一些属性
//在application.properties
#文件上传配置spring.http.multipart.max-file-size=32MBspring.http.multipart.max-request-size=128MB
#启动程序,访问http://localhost:8080/file.html即可

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