Java MultipartFile实现上传文件/上传图片

1. 判断允许上传文件的 文件后缀/图片后缀/相片后缀 和 其它工具类

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. 上传接口

@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", "请选择图片！");
return result;
   }

// 源文件名称
   final String originalFileName = multfiles[0].getOriginalFilename();
   if (StringUtils.isBlank(originalFileName)) {
result.put("message", "请选择图片！");
return result;
   }

// 文件后缀[.jpg]
   final String suffix = originalFileName.substring(originalFileName.lastIndexOf(".")).toLowerCase();
   if (!FileUtil.IMAGE_EXTENSIONS.contains(suffix)) {
result.put("message", "图片格式错误！");
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", "图片上传失败！");
return result;
   }

result.put("message", "上传成功！");
result.put("url", fileUrl);
return result;
 }

3. 上传成功

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

来源：https://juejin.cn/post/6911593761080344583