OSS主要为用户提供数据存储服务，用户可以通过以下操作来处理OSS上的数据：
1、创建、查看、罗列、删除 Bucket；
2、修改、获取Bucket的访问权限；
3、上传、查看、罗列、删除Object/Object Group；
4、访问时支持If-Modified-Since和If-Match等HTTP参数。
特点具体如下：
特点具体如下：
1、易用性：简单易用，便于管理，深度集成数据处理服务；
2、高可靠：多重冗余备份，服务设计可用性不低于99.99%；
3、强安全：多层次安全防护，支持跨区域复制、异地容灾机制；
4、低成本：总体TCO更低，生命周期管理进一步降低成本。
第一次接触，看官方的文档有点迷，因为OSS提供各种各样的功能，你有的会用到，有的则不需要，我要的很简单，就是上传图片到阿里云然后返回一个URL，开始云里雾里，然后豁然开朗，不要用腾讯云的COS，不支持控制台预览，但是人家免费，练习可以去做做实验
1.仔细阅读文档
2.添加Jar包最好按照官方的版本来，以免造成不必要麻烦，如果报错参考https://help.aliyun.com/document_detail/32024.html?spm=a2c4g.11186623.6.692.jKNaBu
遇到是在解决不了的就提交工单，回复很快的！
aliyun-sdk-oss-2.2.1.jar
hamcrest-core-1.1.jar
jdom-1.1.jar
commons-codec-1.9.jar
httpclient-4.4.1.jar
commons-logging-1.2.jar
httpcore-4.4.1.jar
log4j-1.2.15.jar
最新版的demo特别全，但是注释都是英文毕竟国际阿里巴巴，根据需要复制，在demo上修改也可以，下面粘一下Util
public class AliyunOSSClientUtil {
???//log日志
???private static Logger logger = Logger.getLogger(AliyunOSSClientUtil.class);
???//阿里云API的内或外网域名
???private static String ENDPOINT;
???//阿里云API的密钥Access Key ID
???private static String ACCESS_KEY_ID;
???//阿里云API的密钥Access Key Secret
???private static String ACCESS_KEY_SECRET;
???//阿里云API的bucket名称
???private static String BACKET_NAME;
???//阿里云API的文件夹名称
???private static String FOLDER;
???//初始化属性
???static {
???????ENDPOINT = OSSClientContstants.ENDPOINT;
???????ACCESS_KEY_ID = OSSClientContstants.ACCESS_KEY_ID;
???????ACCESS_KEY_SECRET = OSSClientContstants.ACCESS_KEY_SECRET;
???????BACKET_NAME = OSSClientContstants.BUCKET_NAME;
???????FOLDER = OSSClientContstants.FOLDER;
???}
???/**
????* 获取阿里云OSS客户端对象
????*
????* @return ossClient
????*/
???public static OSSClient getOSSClient() {
???????return new OSSClient(ENDPOINT, ACCESS_KEY_ID, ACCESS_KEY_SECRET);
???}
???/**
????* 创建存储空间
????*
????* @param ossClient ?OSS连接
????* @param bucketName 存储空间
????* @return
????*/
???public static String createBucketName(OSSClient ossClient, String bucketName) {
???????//存储空间
???????final String bucketNames = bucketName;
???????if (!ossClient.doesBucketExist(bucketName)) {
???????????//创建存储空间
???????????Bucket bucket = ossClient.createBucket(bucketName);
???????????logger.info("创建存储空间成功");
???????????return bucket.getName();
???????}
???????return bucketNames;
???}
???/**
????* 删除存储空间buckName
????*
????* @param ossClient ?oss对象
????* @param bucketName 存储空间
????*/
???public static void deleteBucket(OSSClient ossClient, String bucketName) {
???????ossClient.deleteBucket(bucketName);
???????logger.info("删除" + bucketName + "Bucket成功");
???}
???/**
????* 创建模拟文件夹
????*
????* @param ossClient ?oss连接
????* @param bucketName 存储空间
????* @param folder ????模拟文件夹名如"qj_nanjing/"
????* @return 文件夹名
????*/
???public static String createFolder(OSSClient ossClient, String bucketName, String folder) {
???????//文件夹名
???????final String keySuffixWithSlash = folder;
???????//判断文件夹是否存在，不存在则创建
???????if (!ossClient.doesObjectExist(bucketName, keySuffixWithSlash)) {
???????????//创建文件夹
???????????ossClient.putObject(bucketName, keySuffixWithSlash, new ByteArrayInputStream(new byte[0]));
???????????logger.info("创建文件夹成功");
???????????//得到文件夹名
???????????OSSObject object = ossClient.getObject(bucketName, keySuffixWithSlash);
???????????String fileDir = object.getKey();
???????????return fileDir;
???????}
???????return keySuffixWithSlash;
???}
???/**
????* 根据key删除OSS服务器上的文件
????*
????* @param ossClient ?oss连接
????* @param bucketName 存储空间
????* @param folder ????模拟文件夹名 如"qj_nanjing/"
????* @param key ???????Bucket下的文件的路径名+文件名 如："upload/cake.jpg"
????*/
???public static void deleteFile(OSSClient ossClient, String bucketName, String folder, String key) {
???????ossClient.deleteObject(bucketName, folder + key);
???????logger.info("删除" + bucketName + "下的文件" + folder + key + "成功");
???}
???/**
????* 上传图片至OSS
????*
????* @param ossClient ?oss连接
????* @param file ??????上传文件（文件全路径如：D:\\image\\cake.jpg）
????* @param bucketName 存储空间
????* @param folder ????模拟文件夹名 如"qj_nanjing/"
????* @return String 返回的唯一MD5数字签名
????*/
???public static String uploadObject2OSS(OSSClient ossClient, MultipartFile file, String bucketName, String folder) {
???????String resultStr = null;
???????String uploadName=null;
???????try {
???????????//以输入流的形式上传文件
???????????InputStream is = file.getInputStream();
???????????//文件名
???????????String fileName = is.getClass().getName();
???????????//文件大小
???????????Long fileSize = file.getSize();
???????????//创建上传Object的Metadata
???????????ObjectMetadata metadata = new ObjectMetadata();
???????????//上传的文件的长度
???????????metadata.setContentLength(is.available());
???????????//指定该Object被下载时的网页的缓存行为
???????????metadata.setCacheControl("no-cache");
???????????//指定该Object下设置Header
???????????metadata.setHeader("Pragma", "no-cache");
???????????//指定该Object被下载时的内容编码格式
???????????metadata.setContentEncoding("utf-8");
???????????//文件的MIME，定义文件的类型及网页编码，决定浏览器将以什么形式、什么编码读取文件。如果用户没有指定则根据Key或文件名的扩展名生成，
???????????//如果没有扩展名则填默认值application/octet-stream
???????????metadata.setContentType(getContentType(fileName));
???????????//指定该Object被下载时的名称（指示MINME用户代理如何显示附加的文件，打开或下载，及文件名称）
???????????metadata.setContentDisposition("filename/filesize=" + fileName + "/" + fileSize + "Byte.");
???????????//上传文件 ??(上传文件流的形式)
???????????//上传的文件名称
????????????uploadName= UUID.randomUUID().toString();
???????????PutObjectResult putResult = ossClient.putObject(bucketName, folder + uploadName, is, metadata);
???????????//解析结果
???????????resultStr = putResult.getETag();
???????} catch (Exception e) {
???????????e.printStackTrace();
???????????logger.error("上传阿里云OSS服务器异常." + e.getMessage(), e);
???????}
???????return folder+uploadName;
???}
???/**
????* 通过文件名判断并获取OSS服务文件上传时文件的contentType
????*
????* @param fileName 文件名
????* @return 文件的contentType
????*/
???public static String getContentType(String fileName) {
???????//文件的后缀名
???????String fileExtension = fileName.substring(fileName.lastIndexOf("."));
???????if (".bmp".equalsIgnoreCase(fileExtension)) {
???????????return "image/bmp";
???????}
???????if (".gif".equalsIgnoreCase(fileExtension)) {
???????????return "image/gif";
???????}
???????if (".jpeg".equalsIgnoreCase(fileExtension) || ".jpg".equalsIgnoreCase(fileExtension) || ".png".equalsIgnoreCase(fileExtension)) {
???????????return "image/jpeg";
???????}
???????if (".html".equalsIgnoreCase(fileExtension)) {
???????????return "text/html";
???????}
???????if (".txt".equalsIgnoreCase(fileExtension)) {
???????????return "text/plain";
???????}
???????if (".vsd".equalsIgnoreCase(fileExtension)) {
???????????return "application/vnd.visio";
???????}
???????if (".ppt".equalsIgnoreCase(fileExtension) || "pptx".equalsIgnoreCase(fileExtension)) {
???????????return "application/vnd.ms-powerpoint";
???????}
???????if (".doc".equalsIgnoreCase(fileExtension) || "docx".equalsIgnoreCase(fileExtension)) {
???????????return "application/msword";
???????}
???????if (".xml".equalsIgnoreCase(fileExtension)) {
???????????return "text/xml";
???????}
???????//默认返回类型
???????return "image/jpeg";
???}
写一个form表单选择上传图片<form action="/a/App/LikeApp/fileUpload" method="post" enctype="multipart/form-data">
???<input type="file" name="file">
???<input type="submit" value="提交">
</form>
url 由几个参数拼接
@ResponseBody
@RequestMapping(value ="fileUpload",method = RequestMethod.POST)
public ObjectStatus FileUpload(@RequestParam(value = "file") MultipartFile file, HttpServletRequest request){
???OSSClient ossClient = AliyunOSSClientUtil.getOSSClient();
???String md5key = AliyunOSSClientUtil.uploadObject2OSS(ossClient, file, BUCKET_NAME, FOLDER);
???String s = "https://" + BUCKET_NAME + "." + ENDPOINT + "/" + md5key;
???return new ObjectStatus("200","success",s);
}
简单上传图片到阿里云OSS
原文地址：https://www.cnblogs.com/-why/p/9093146.html