Spring Boot实现图片上传功能

package com.clou.inteface.domain.web.user;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

/**
 * 文件上传
 * @author Fly
 *
 */
@RestController
public class FileUpload {
 
 /**
 * 用户管理 -> 业务层
 */
 @Autowired
 private SUserService sUserService;
 
 /**
 * 文件上传根目录(在Spring的application.yml的配置文件中配置):<br>
 * web:
 * upload-path: （jar包所在目录）/resources/static/
 */
 @Value("${web.upload-path}")
 private String webUploadPath;
 
 /**
 * ResultVo是一个对象，包含：
 * private int errorCode;
 * private String errorMsg;
 * private Integer total;
 * private Object data;
 */

 /**
 * 基于用户标识的头像上传
 * @param file 图片
 * @param userId 用户标识
 * @return
 */
 @PostMapping(value = "/fileUpload",consumes = MediaType.MULTIPART_FORM_DATA_VALUE,produces = MediaType.APPLICATION_JSON_VALUE)
 public ResultVo fileUpload(@RequestParam("file") MultipartFile file,@RequestParam("userId") Integer userId) {
 ResultVo resultVo = new ResultVo();
 if (!file.isEmpty()) {
 if (file.getContentType().contains("image")) {
 try {
  String temp = "images" + File.separator + "upload" + File.separator;
  // 获取图片的文件名
  String fileName = file.getOriginalFilename();
  // 获取图片的扩展名
  String extensionName = StringUtils.substringAfter(fileName,".");
  // 新的图片文件名 = 获取时间戳+"."图片扩展名
  String newFileName = String.valueOf(System.currentTimeMillis()) + "." + extensionName;
  // 数据库保存的目录
  String datdDirectory = temp.concat(String.valueOf(userId)).concat(File.separator);
  // 文件路径
  String filePath = webUploadPath.concat(datdDirectory);

  File dest = new File(filePath,newFileName);
  if (!dest.getParentFile().exists()) {
  dest.getParentFile().mkdirs();
  }
  // 判断是否有旧头像，如果有就先删除旧头像，再上传
  SUser userInfo = sUserService.findUserInfo(userId.toString());
  if (StringUtils.isNotBlank(userInfo.getUserHead())) {
  String oldFilePath = webUploadPath.concat(userInfo.getUserHead());
  File oldFile = new File(oldFilePath);
  if (oldFile.exists()) {
  oldFile.delete();
  }
  }
  // 上传到指定目录
  file.transferTo(dest);

  // 将图片流转换进行BASE64加码
  //BASE64Encoder encoder = new BASE64Encoder();
  //String data = encoder.encode(file.getBytes());

  // 将反斜杠转换为正斜杠
  String data = datdDirectory.replaceAll("\","/") + newFileName;
  Map<String,Object> resultMap = new HashMap<>();
  resultMap.put("file",data);
  resultVo.setData(resultMap);
  resultVo.setError(1,"上传成功!");
 } catch (IOException e) {
  resultVo.setError(0,"上传失败!");
 }
 } else {
 resultVo.setError(0,"上传的文件不是图片类型，请重新上传!");
 }
 return resultVo;
 } else {
 resultVo.setError(0,"上传失败，请选择要上传的图片!");
 return resultVo;
 }
 }

}