ducha-houduan/supervision-admin/src/main/java/com/supervision/web/noticeManage/controller/FileController.java

package com.supervision.web.noticeManage.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.ResponseEntity;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.*;
import java.nio.file.*;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.*;

@RestController
@RequestMapping("/notice")
public class FileController {

    @Value("${file.upload-dir}")
    private String uploadDir;

    @Value("${file.url-prefix}")
    private String urlPrefix;

    @PostMapping("/upload")
    public ResponseEntity<?> upload(@RequestParam("file") MultipartFile file) {
        if (file == null || file.isEmpty()) {
            return ResponseEntity.badRequest().body(Collections.singletonMap("message", "文件为空"));
        }
        try {
            // 按日期分目录： yyyy/MM/dd
            String sub = LocalDate.now().format(DateTimeFormatter.ofPattern("yyyy/MM/dd"));
            Path dir = Paths.get(uploadDir, sub);
            if (!Files.exists(dir)) Files.createDirectories(dir);

            String original = StringUtils.cleanPath(Objects.requireNonNull(file.getOriginalFilename()));
            String ext = "";
            int idx = original.lastIndexOf('.');
            if (idx >= 0) ext = original.substring(idx);

            String filename = UUID.randomUUID().toString().replace("-", "") + ext;
            Path target = dir.resolve(filename);
            try (InputStream in = file.getInputStream()) {
                Files.copy(in, target, StandardCopyOption.REPLACE_EXISTING);
            }

            // 返回相对 URL：/files/yyyy/MM/dd/filename.ext
            String fileUrl = urlPrefix + "/" + sub + "/" + filename;
            Map<String, Object> body = new HashMap<>();
            body.put("url", fileUrl);
            body.put("contentType", file.getContentType());
            return ResponseEntity.ok(body);
        } catch (IOException e) {
            e.printStackTrace();
            return ResponseEntity.status(500).body(Collections.singletonMap("message", "上传失败"));
        }
    }
}