springboot cotroller 下载本地文件

导入hutool maven依赖

<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.8.16</version>
</dependency>

下载文件controller代码片段
@GetMapping(“/pics/{path}”)
public ResponseEntity<byte[]> getFile(@PathVariable(“path”) Long path) {
try {

        File file = FileUtil.file(path);
        if (file.exists() && file.canRead()) {
            byte[] fileContent = FileUtil.readBytes(file);
            return ResponseEntity.ok()
                    .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + path + "\"")
                    .header(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_OCTET_STREAM_VALUE)
                    .body(fileContent);
        } else {
            return ResponseEntity.notFound().build();
        }
    } catch (Exception e) {
        return ResponseEntity.badRequest().build();
    }
}