elementui+springboot文件上传

前端

                            
                            
将文件拖到此处，或点击上传
                            
只能上传jpg/png文件，且不超过500kb
                        

:on-success="upload"是上传成功的钩子，详细看elementui文档

后端

controller

@PostMapping("upload")
    public Result uploadImg(@RequestParam("image") MultipartFile multipartFile) throws FileNotFoundException {
        if (multipartFile.isEmpty()) {
            //文件为空逻辑
        }
        String contentType = multipartFile.getContentType();
        if (!contentType.contains("")) {
            /
        }
        String root_fileName = multipartFile.getOriginalFilename();
        //获取路径
        //
        String filePath ="src/main/resources/static/goods_ima";;
        String file_name = null;

        try {
            file_name = ImageUtil.saveImg(multipartFile, filePath);
            System.out.println("文件名：" + file_name);
        } catch (IOException e) {
            e.printStackTrace();
        }
        //封装Result
        Map result = new HashMap<>();
        result.put("imageUrl","http://localhost:8080/goods_ima/"+file_name);
        return Result.ok().data(result);
    }

 上传文件的配置类

@Configuration
public class WebAppConfig implements WebMvcConfigurer {

    /**
     * 在配置文件中配置的文件保存路径
     */

    @Bean
    public MultipartConfigElement multipartConfigElement(){
        MultipartConfigFactory factory = new MultipartConfigFactory();
        //文件最大KB,MB
        factory.setMaxFileSize(DataSize.ofMegabytes(2));
        //设置总上传数据总大小
        factory.setMaxRequestSize(DataSize.ofMegabytes(20));
        return factory.createMultipartConfig();
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        System.out.println("配置文件已经生效");
        //关于图片上传后需要重启服务器才能刷新图片
        //这是一种保护机制，为了防止绝对路径被看出来，目录结构暴露
        //解决方法:将虚拟路径/images/
        //        向绝对路径 (D:\单子\仓库管理系统\后端\src\main\resources\static\goods_ima\)映射

        String path="D:\\单子\\仓库管理系统\\后端\\src\\main\\resources\\static\\goods_ima\\";
        registry.addResourceHandler("/goods_ima/**").addResourceLocations("file:"+path);

    }

}

保存文件的逻辑

public class ImageUtil {
    /**
     * 保存文件，直接以multipartFile形式
     * @param multipartFile
     * @param path 文件保存绝对路径
     * @return 返回文件名
     * @throws IOException
     */
    public static String saveImg(MultipartFile multipartFile, String path) throws IOException {
        File file = new File(path);
        if (!file.exists()) {
            file.mkdirs();
        }
        FileInputStream fileInputStream = (FileInputStream) multipartFile.getInputStream();
        String fileName = System.currentTimeMillis() + ".png";
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(path + File.separator + fileName));
        byte[] bs = new byte[1024];
        int len;
        while ((len = fileInputStream.read(bs)) != -1) {
            bos.write(bs, 0, len);
        }
        bos.flush();
        bos.close();
        return fileName;
    }
}

效果

前端上传

保存在后端的文件