SpringBoot实现上传头像给功能和查看头像功能

@Component("appConfig")
public class AppConfig {//获取application.properties定义的根目录@Value("${project.folder:}")private String projectFolder;public String getProjectFolder() {return projectFolder;}}

  2.引入AppConfig

@Resource
private AppConfig appConfig;

3.上传文件代码

@RequestMapping("/updateUserAvatar")public ResponseVO updateUserAvatar(HttpSession session, MultipartFile avatar){SessionWebUserDto webUserDto = getUserInfoFromSession(session);String baseFolder = appConfig.getProjectFolder()+Constants.FILE_FOLDER_FILE;File targetFileFolder = new File(baseFolder+Constants.FILE_FOLDER_AVATAR_NAME);File targetFile = new File(targetFileFolder.getPath()+"/"+webUserDto.getUserId()+Constants.AVATAR_SUFFIX);if(!targetFileFolder.exists()){targetFileFolder.mkdirs();}try {avatar.transferTo(targetFile);} catch (Exception e) {logger.error("上传头像失败",e);}return getSuccessResponseVO(null);}
//我这边用到的是Session来记录用户登录信息的，当然你也可以使用别的方式，这里的大概内容是这样，(别的方式的话)自行实现一下就好，逻辑也差不多

 2.获取头像

/*** 获取用户头像* @param session* @param userId* @return*/@RequestMapping("/getAvatar/{userId}")@GlobalInterceptor(checkParams = true)public void getAvatar(HttpServletResponse response,HttpSession session, @VerifyParam(required = true) @PathVariable("userId") String userId){//定义头像存放的根目录String avatarFolderName = Constants.FILE_FOLDER_FILE + Constants.FILE_FOLDER_AVATAR_NAME;//如果这个目录不存在的话创建这个目录File folder = new File(appConfig.getProjectFolder()+avatarFolderName);if(!folder.exists()){folder.mkdirs();}//定义头像存放的具体位置String avatarPath = appConfig.getProjectFolder()+avatarFolderName+userId+Constants.AVATAR_SUFFIX;File file = new File(avatarPath);//如果头像不存在的话,输出一个默认的头像if(!file.exists()){//如果说默认头像不存在的话if(!new File(appConfig.getProjectFolder() + avatarFolderName+Constants.AVATAR_DEFAULT).exists()){printNoDefaultImage(response);}avatarPath = appConfig.getProjectFolder()+avatarFolderName+Constants.AVATAR_DEFAULT;response.setContentType("image/jpg");readFile(response,avatarPath);}}

 1.实现readFile方法

//读文件，返回一个文件流protected void readFile(HttpServletResponse response,String filePath){//如果文件路径不合法,则直接返回if(!StringTools.pathIsOk(filePath)){return;}OutputStream out = null;FileInputStream in = null;try {File file = new File(filePath);// 如果文件不存在，则直接返回if (!file.exists()) {return;}in = new FileInputStream(file);  // 打开文件输入流byte[] byteData = new byte[1024];  // 定义缓冲区out = response.getOutputStream();  // 获取响应输出流int len = 0;// 读取文件并写入响应输出流while ((len = in.read(byteData)) != -1) {out.write(byteData, 0, len);}out.flush();} catch (Exception e) {logger.error("读取文件异常", e);} finally {//关闭输出流if(out != null){try {out.close();} catch (IOException e) {logger.error("IO异常",e);}}//关闭输入流if(in != null ){try{in.close();}catch (IOException e){logger.error("IO异常", e);}}}}