1. 判斷允許上傳檔案的 檔案字尾/圖片字尾/相片字尾 和 其它工具類

import org.springframework.stereotype.Component;
import java.io.File;
import java.util.Arrays;
import java.util.List;

@Component
public class FileUtil {
  public static final List<String> IMAGE_EXTENSIONS = Arrays.asList(".jpg",".jpeg",".png");
}

import java.util.UUID;

public class CommonUtil {
  public static String getUUID() {
    String uuid = UUID.randomUUID().toString().replaceAll("-","");
    return uuid;
  }
}

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class DateUtil {
  public static final String HH = "HH";
  public static final String YYYY_MM_DD = "yyyy-MM-dd";
  public static final DateTimeFormatter FORMATTER_HH = DateTimeFormatter.ofPattern(HH);
  public static final DateTimeFormatter FORMATTER_YYYY_MM_DD = DateTimeFormatter.ofPattern(YYYY_MM_DD);
  public static String getHH() {
    return FORMATTER_HH.format(LocalDateTime.now());
  }
  public static String getYYYYMMDD() {
    return FORMATTER_YYYY_MM_DD.format(LocalDateTime.now());
  }
}

2. 上傳介面

@PostMapping("/updateImage.do")
public Map<String,String> updateImage(@RequestParam("image") MultipartFile[] multfiles) {
  	Map<String,String> result = new HashMap<>();
    if (multfiles.length == 0) {
			result.put("message","請選擇圖片！");
			return result;
    }

    // 原始檔名稱
    final String originalFileName = multfiles[0].getOriginalFilename();
    if (StringUtils.isBlank(originalFileName)) {
			result.put("message","請選擇圖片！");
			return result;
    }

    // 檔案字尾[.jpg]
    final String suffix = originalFileName.substring(originalFileName.lastIndexOf(".")).toLowerCase();
    if (!FileUtil.IMAGE_EXTENSIONS.contains(suffix)) {
			result.put("message","圖片格式錯誤！");
			return result;
    }

    String lastFilePath;
    String newFileName = CommonUtil.getUUID() + suffix;
    String folderName = File.separator + "temp" + File.separator;
    String relativePath = folderName + DateUtil.getYYYYMMDD() + File.separator + DateUtil.getHH();
    String filePath = "D:\\file" + relativePath;
    String fileUrl = null;
    File targetFile = new File(filePath);
    if (!targetFile.exists()) {
      targetFile.mkdirs();
    }
    FileOutputStream out = null;
    try {
      lastFilePath = filePath + File.separator + newFileName;
      out = new FileOutputStream(lastFilePath);
      out.write(multfiles[0].getBytes());
      fileUrl = "http://127.0.0.1:9000" + relativePath + File.separator + newFileName;
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      if (out != null) {
        try {
          out.flush();
        } catch (IOException e) {
          e.printStackTrace();
        }
        try {
          out.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }

    if (fileUrl == null) {
			result.put("message","圖片上傳失敗！");
			return result;
    }

		result.put("message","上傳成功！");
		result.put("url",fileUrl);
		return result;
  }

3. 上傳成功

url => http://127.0.0.1:9000/temp/2019-09-12/14/0eac00b96f134652b34172e84febe8d1.jpg

以上就是Java MultipartFile實現上傳檔案/上傳圖片的詳細內容，更多關於Java MultipartFile上傳檔案的資料請關注我們其它相關文章！