Spring Boot REST API返回文件列表

Question

我正在尝试从目录中返回文件列表。这是我的代码：

package com.demo.web.api.file;

import java.io.File;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.demo.core.Logger;

import io.swagger.v3.oas.annotations.Operation;

@RestController
@RequestMapping(value = "/files")
public class FileService {

    private static final Logger logger = Logger.factory(FileService.class);

    @Value("${file-upload-path}")
    public String DIRECTORY;

    @Value("${file-upload-check-subfolders}")
    public boolean CHECK_SUBFOLDERS;

    @GetMapping(value = "/list")
    @Operation(summary = "Get list of Uploaded files")
    public ResponseEntity<List<File>> list() {

        List<File> files = new ArrayList<>();

        if (CHECK_SUBFOLDERS) {

            // Recursive check
            try (Stream<Path> walk = Files.walk(Paths.get(DIRECTORY))) {
                List<Path> result = walk.filter(Files::isRegularFile).collect(Collectors.toList());

                for (Path p : result) {
                    files.add(p.toFile().getAbsoluteFile());
                }
            } catch (Exception e) {

                logger.error(e.getMessage());

            }

        } else {

            // Checks the root directory only.
            try (Stream<Path> walk = Files.walk(Paths.get(DIRECTORY), 1)) {
                List<Path> result = walk.filter(Files::isRegularFile).collect(Collectors.toList());

                for (Path p : result) {
                    files.add(p.toFile().getAbsoluteFile());
                }
            } catch (Exception e) {

                logger.error(e.getMessage());

            }

        }

        return ResponseEntity.ok().body(files);

    }

}

如代码所示，我正在尝试返回文件列表。

如何使它返回文件对象而不是文件路径字符串？我需要获取要在视图中显示的文件属性（大小、日期等）。

Answer 1

我建议你改变你的回答

public ResponseEntity<List<Resource>> list() {}

您还可以尝试在@GetMapping注释中指定 produce=MediaType... 参数，以便告诉 HTTP 编组程序预期哪种内容。