JAVA文件上传下载

一、文件上传

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public class UploadUtil {

    public boolean upload(String fileUploadPath, MultipartFile file) throws IOException {
        String filename = file.getOriginalFilename();//获取文件名
       // String newfilename = UUID.randomUUID().toString();
       // String fix=filename.substring(filename.lastIndexOf("."),filename.length());
        //String newfile = newfilename+fix;
        String filePath = fileUploadPath+filename;//文件保存的地址及名称

        File files = new File(filePath);
        //检查文件夹是否存在
        if(!files.getParentFile().exists()){
            files.getParentFile().mkdirs();//新建文件夹
        }
        file.transferTo(files);//写入文件
        return true;
    }
    public boolean uploads(String fileUploadPath, MultipartFile[] file) throws IOException {

        for(MultipartFile name : file){

            if(!name.isEmpty()){
                String filename = name.getOriginalFilename();//获取文件名
               // String newfilename = UUID.randomUUID().toString();
                //String fix=filename.substring(filename.lastIndexOf("."),filename.length())
                // String newfile = newfilename+fix;
                String filePath = fileUploadPath+filename;//文件保存的地址及名称
                File files = new File(filePath);
                //检查文件夹是否存在
                if(!files.getParentFile().exists()){
                    files.getParentFile().mkdirs();//新建文件夹
                }
                name.transferTo(files);//写入文件
            }
        }
        return true;
    }
}

二、文件下载

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public class DownloadUtil {
    public boolean download(String path, String name, HttpServletRequest request, HttpServletResponse response){

        FileInputStream fileIn = null;
        ServletOutputStream out = null;
        try {
            response.setContentType("application/octet-stream");
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(name+".PNG", "UTF-8"));
            File file;
            String filePathString = path + name+".PNG";
            file = new File(filePathString);
            fileIn = new FileInputStream(file);
            out = response.getOutputStream();
            byte[] outputByte = new byte[1024];
            int readTmp = 0;
            while ((readTmp = fileIn.read(outputByte)) != -1) {
                out.write(outputByte, 0, readTmp); //并不是每次都能读到1024个字节，所有用readTmp作为每次读取数据的长度，否则会出现文件损坏的错误
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                fileIn.close();
                out.flush();
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return true;
    }
}