今天完成的事

根据网上教程终于实现了上传图片到阿里云然后显示出图片。

封装了一个工具类

//文件存储目录
private String filedir = "data/";

private OSS ossClient;

public OSSClientUtil() {
     ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
}

/**
 * 初始化
 */
public void init() {
    ossClient = new OSSClientBuilder().build(endpoint, accessKeyId, accessKeySecret);
}

/**
 * 销毁
 */
public void destory() {
    ossClient.shutdown();
}

/**
 * 上传图片
 *
 * @param url
 */
public void uploadImg2Oss(String url) throws ImgException {
    File fileOnServer = new File(url);
    FileInputStream fin;
    try {
        fin = new FileInputStream(fileOnServer);
        String[] split = url.split("/");
        this.uploadFile2OSS(fin, split[split.length - 1]);

    } catch (FileNotFoundException e) {
        throw new ImgException("图片上传失败");
    }
}


public String uploadImg2Oss(MultipartFile file) throws ImgException {
    if (file.getSize() > 1024 * 1024) {
        throw new ImgException("上传图片大小不能超过1M！");
    }
    String originalFilename = file.getOriginalFilename();
    String substring = originalFilename.substring(originalFilename.lastIndexOf(".")).toLowerCase();
    Random random = new Random();
    String name = random.nextInt(10000) + System.currentTimeMillis() + substring;
    try {
        InputStream inputStream = file.getInputStream();
        this.uploadFile2OSS(inputStream, name);
        return name;
    } catch (Exception e) {
        throw new ImgException("图片上传失败");
    }
}

/**
 * 获得图片路径
 *
 * @param fileUrl
 * @return
 */
public String getImgUrl(String fileUrl) {
    if (!StringUtils.isEmpty(fileUrl)) {
        String[] split = fileUrl.split("/");
        return this.getUrl(this.filedir + split[split.length - 1]);
    }
    return null;
}

/**
 * 上传到OSS服务器  如果同名文件会覆盖服务器上的
 *
 * @param instream 文件流
 * @param fileName 文件名称 包括后缀名
 * @return 出错返回"" ,唯一MD5数字签名
 */
public String uploadFile2OSS(InputStream instream, String fileName) {
    String ret = "";
    try {
        //创建上传Object的Metadata
        ObjectMetadata objectMetadata = new ObjectMetadata();
        objectMetadata.setContentLength(instream.available());
        objectMetadata.setCacheControl("no-cache");
        objectMetadata.setHeader("Pragma", "no-cache");
        objectMetadata.setContentType(getcontentType(fileName.substring(fileName.lastIndexOf("."))));
        objectMetadata.setContentDisposition("inline;filename=" + fileName);
        //上传文件
        PutObjectResult putResult = ossClient.putObject(bucketName, filedir + fileName, instream, objectMetadata);
        ret = putResult.getETag();
    } catch (IOException e) {
        log.error(e.getMessage(), e);
    } finally {
        try {
            if (instream != null) {
                instream.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return ret;
}

/**
 * Description: 判断OSS服务文件上传时文件的contentType
 *
 * @param FilenameExtension 文件后缀
 * @return String
 */
public static String getcontentType(String FilenameExtension) {
    if (FilenameExtension.equalsIgnoreCase(".bmp")) {
        return "image/bmp";
    }
    if (FilenameExtension.equalsIgnoreCase(".gif")) {
        return "image/gif";
    }
    if (FilenameExtension.equalsIgnoreCase(".jpeg") ||
            FilenameExtension.equalsIgnoreCase(".jpg") ||
            FilenameExtension.equalsIgnoreCase(".png")) {
        return "image/jpeg";
    }
    if (FilenameExtension.equalsIgnoreCase(".html")) {
        return "text/html";
    }
    if (FilenameExtension.equalsIgnoreCase(".txt")) {
        return "text/plain";
    }
    if (FilenameExtension.equalsIgnoreCase(".vsd")) {
        return "application/vnd.visio";
    }
    if (FilenameExtension.equalsIgnoreCase(".pptx") ||
            FilenameExtension.equalsIgnoreCase(".ppt")) {
        return "application/vnd.ms-powerpoint";
    }
    if (FilenameExtension.equalsIgnoreCase(".docx") ||
            FilenameExtension.equalsIgnoreCase(".doc")) {
        return "application/msword";
    }
    if (FilenameExtension.equalsIgnoreCase(".xml")) {
        return "text/xml";
    }
    return "image/jpeg";
}

/**
 * 获得url链接
 *
 * @param key
 * @return
 */
public String getUrl(String key) {
    // 设置URL过期时间为10年  3600l* 1000*24*365*10
    Date expiration = new Date(System.currentTimeMillis() + 3600L * 1000 * 24 * 365 * 10);
    // 生成URL
    URL url = ossClient.generatePresignedUrl(bucketName, key, expiration);
    if (url != null) {
        return url.toString();
    }
    return null;
}

service

@Override
public String updateHead(MultipartFile file, int userId) throws IOException, ImgException {
    if (file == null || file.getSize() <= 0) {
        throw new ImgException("头像不能为空");
    }
    String name = ossClient.uploadImg2Oss(file);
    String imgUrl = ossClient.getImgUrl(name);
    ossClient.destory();
    User user=new User();
    user.setId(userId);
    user.setImage(imgUrl);
    //根据id更新数据库里的头像url
    userMapper.updateHead(user);
    return imgUrl;
}

controller

@RequestMapping(value = "/img",method = RequestMethod.POST)
public String uploadImg(@RequestParam MultipartFile file,Model model){
    try {
        String head = userService.updateHead(file, 1);
        model.addAttribute("data", head);
    } catch (IOException e) {
        e.printStackTrace();

    } catch (ImgException e) {
        e.printStackTrace();
    }
    return "upload";
}

成果

明天的计划：

把这个工具类的实现思路整理一遍，然后自己封装一个。

遇到的问题：

上传图片后，不知道用oss的哪个类型获取url。

收获: