文件上传原生-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_45123573/article/details/103694641

本文介绍了一种使用Java和commons-fileupload库实现的原生文件上传方法，通过ServletFileUpload解析HTTP请求，将上传的文件保存到指定目录，并确保唯一文件名避免覆盖。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

Controller

@Controller
@RequestMapping("/file")
public class UploadController {
    /**
     * 原生文件上传
     * @param req
     * @return
     * @throws Exception
     */
    @RequestMapping("/upload1")
    public String upload1(HttpServletRequest req) throws Exception {
        String realPath = req.getSession().getServletContext().getRealPath("/uploads");
        File file = new File(realPath);
        if (!file.exists()) {
            file.mkdirs();
        }

        DiskFileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);
        List<FileItem> items = upload.parseRequest(req);
        for (FileItem item : items) {
            if (item.isFormField()) {
                //普通表单
            } else {
                String uuid = UUID.randomUUID().toString().replace("-", "");
                String filename = uuid + "_" + item.getName();
                item.write(new File(realPath, filename));
                item.delete();
            }
        }
        return "success";
    }

pom

 		<dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.4</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.3</version>
        </dependency>

JSP

<h3>form表单文件上传</h3>
<form action="/file/upload1" method="post" enctype="multipart/form-data">
    <input type="file" name="upload"><br>
    <input type="submit" value="提交"/>
</form><br>