[Java知识库] Springboot文件上传和文件下载

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[Java知识库]Springboot文件上传和文件下载

环境准备

自己创建要给springboot项目，导入基本的环境，
准备一份upload.html用于上传
准备一份download.html用于下载
upload.html代码如下：

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form th:action="@{/file/upload}" method="post" enctype="multipart/form-data">
    <input type="file" name="upload"><br>
    <input type="submit" value="上传文件">
</form>
</body>
</html>

download.html代码如下：

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!--文件下载-->
<p>
    <a th:href="@{/file/download(fileName=头像73b4cd2181c9447393bd6b8908ea57ba.jpg)}">下载照片</a>
    <a th:href="@{/file/download(fileName=mysql8.0.16配置ac8336e2a17d441398a153336638ea44.docx)}">下载world文件</a>
</p>

</body>
</html>

文件上传代码和下载代码如下：

@Controller
@RequestMapping("/file")
public class FileController {

    @GetMapping("/goUpload")
    public String goUpload() {
        return "upload";
    }

    @GetMapping("/goDownload")
    public String goDownload() {
        return "download";
    }

    @ResponseBody
    @RequestMapping("/upload")
    public String upload(MultipartFile upload) throws IOException {
        //获取文件的原始名称和后缀名
        String originalFilename = upload.getOriginalFilename();

        //获取原始的文件名字
        String fileOgrName = originalFilename.substring(0, originalFilename.lastIndexOf("."));

        //获取文件的后缀
        String extension = "." + FilenameUtils.getExtension(originalFilename);

        //生成新的文件名字
        String newFileName = fileOgrName + UUID.randomUUID().toString().replace("-", "") + extension;
        //这里我们使用一个特定的文件目录
        String realPath = ResourceUtils.getURL("classpath:").getPath() + "static/files";
        //处理根据日期生成文件目录======实际开发项目中使用日期文件目录
        //  String dateDirPath = realPath + "/" + new SimpleDateFormat("yyyy-MM-dd").format(new Date());
        String dateDirPath = realPath + "/";
        System.out.println(dateDirPath);
        File dateFile = new File(dateDirPath);
        if (!dateFile.exists()){
            dateFile.mkdirs();
        }
        //文件上传
        upload.transferTo(new File(dateDirPath,newFileName));

        return "文件上传成功";
    }

    @ResponseBody
    @RequestMapping("/download")
    public String download(String fileName, HttpServletRequest request, HttpServletResponse response) throws IOException {
        String realPath = ResourceUtils.getURL("classpath:").getPath() + "static/files";

        FileInputStream fileInputStream = new FileInputStream(new File(realPath, fileName));
        //附件下载方式
        response.setHeader("content-disposition","attachment;filename="+ URLEncoder.encode(fileName,"utf-8"));
        ServletOutputStream outputStream = response.getOutputStream();
        IOUtils.copy(fileInputStream, outputStream);
        IOUtils.closeQuietly(fileInputStream);
        IOUtils.closeQuietly(outputStream);
        return "文件下载成功";
    }

}