springboot文件上传(支持单个和多个)

package com.alibaba.utils; import org.springframework.beans.factory.annotation.Value; import org.springframework.http.MediaType; import org.springframework.stereotype.Component; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.multipart.MultipartFile; import java.io.File; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Objects; /** * @author * @Desoription : 文件上传工具类 */ @Component public class FileUtils { @Value("${file.uploadWindow}") private String UPLOAD_WINDOW; @Value("${file.uploadLinux}") private String UPLOAD_LINUX; public String singleFile(MultipartFile file) { if (Objects.isNull(file) || file.isEmpty()) { return "文件为空!"; } try { byte[] bytes = file.getBytes(); String UPLOAD_FOLDER; //若当前系统是window系统 if(System.getProperty("os.name").toLowerCase().contains("windows")) { UPLOAD_FOLDER = UPLOAD_WINDOW; }else{ //若当前系统是linux系统 UPLOAD_FOLDER = UPLOAD_LINUX; } //File.separator表示分隔符 //file.getOriginalFilename()表示文件全名(包括后缀名) Path path = Paths.get(UPLOAD_FOLDER + File.separator + getFilename(file.getOriginalFilename())); //如果没有此文件夹，则创建 if (!Files.isWritable(path)) { Files.createDirectories(Paths.get(UPLOAD_FOLDER)); } //文件写入指定路径 Files.write(path, bytes); //若上传成功 return "上传成功"; } catch (IOException e) { //若发生异常 return "发生异常"; } } /** * 上传多个文件 * * @return string * @param: file 和标签name对应,否则无响应 */ public String multiFile(MultipartFile[] file) { try { for (int i = 0; i < file.length; i++) { if (file[i] != null) { singleFile(file[i]); } } return "上传成功"; } catch (Exception e) { return e.getMessage(); } } /** * 设置文件名,防止相同文件名冲突 * 原名称+时间(年月日)+后缀 * @param originalFilename 原名称 * @return string */ private String getFilename(String originalFilename) { //后缀名 如 .txt String suffix = originalFilename.substring(originalFilename.lastIndexOf(".")); //后缀名之前的名称 String prefix = originalFilename.substring(0, originalFilename.lastIndexOf(".")); DateFormat format = new SimpleDateFormat("yyyyMMddHHmmss"); // 将此时时间转换为字符串 String formatDate = format.format(new Date()); // 拼接文件名 String filename = new StringBuffer().append(prefix).append("_").append(formatDate).append(suffix).toString(); return filename; } }