Spring boot应用程序在提供静态内容时显示文件下载选项

import org.springframework.core.io.Resource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.mvc.method.annotation.MvcUriComponentsBuilder;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import java.io.IOException;
import java.util.stream.Collectors;

@Controller
public class FileDownloadController {

    @GetMapping("/download")
    public ResponseEntity<Resource> downloadFile(@RequestParam("filename") String filename) {
        // 从指定路径获取文件资源
        Resource file = // 从指定路径获取文件资源的代码

        // 设置响应头信息
        HttpHeaders headers = new HttpHeaders();
        headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=" + filename);

        // 返回文件下载响应
        return ResponseEntity.ok()
                .headers(headers)
                .contentType(MediaType.APPLICATION_OCTET_STREAM)
                .body(file);
    }
}