阿里云对象存储服务，OSS使用经验总结，图片存储，分页查询

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;


import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.web.multipart.MultipartFile;


import com.aliyun.oss.ClientConfiguration;
import com.aliyun.oss.OSSClient;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.GetObjectRequest;
import com.aliyun.oss.model.ListObjectsRequest;
import com.aliyun.oss.model.OSSObject;
import com.aliyun.oss.model.OSSObjectSummary;
import com.aliyun.oss.model.ObjectListing;
import com.aliyun.oss.model.PutObjectRequest;

//阿里云对象存储服务OSS工具
public class OssUtil {


	// 演示，创建Bucket的时候，endpoint不能带上.
	// 图片上传和简单的图片访问也可以用这个。
	public static String endpoint = "http://oss-cn-hangzhou.aliyuncs.com";


	// 图片处理，需要用单独的地址。访问、裁剪、缩放、效果、水印、格式转换等服务。
	// public static String endpointImg = "http://img-cn-hangzhou.aliyuncs.com";


	public static String accessKeyId = "hi";
	public static String accessKeySecret = "hi";
	public static String bucketName = "hi";


	// 单例，只需要建立一次链接
	private static OSSClient client = null;
	// 是否使用另外一套本地账户
	public static final boolean MINE = false;


	static {
		if (MINE) {
			accessKeyId = "hi2";
			accessKeySecret = "hi2";
			bucketName = "hi2";
			endpoint = "http://oss-cn-shanghai.aliyuncs.com";
		}
	}


	//配置参数
	static ClientConfiguration config() {
		ClientConfiguration conf = new ClientConfiguration();
		conf.setMaxConnections(100);
		conf.setConnectionTimeout(5000);
		conf.setMaxErrorRetry(3);
		conf.setSocketTimeout(2000);
		return conf;
	}


	//客户端
	public static OSSClient client() {
		if (client == null) {
			ClientConfiguration conf = config();
			client = new OSSClient(endpoint, accessKeyId, accessKeySecret, conf);
			makeBucket(client, bucketName);
		}
		return client;
	}


	//创建Bucket
	public static void makeBucket(String bucketName) {
		OSSClient client = client();
		makeBucket(client, bucketName);
	}


	//创建Bucket
	public static void makeBucket(OSSClient client, String bucketName) {
		boolean exist = client.doesBucketExist(bucketName);
		if (exist) {
			p("The bucket exist.");
			return;
		}
		client.createBucket(bucketName);
	}


	//上传一个文件，InputStream
	public static void uploadFile(InputStream is, String key) {
		OSSClient client = client();
		PutObjectRequest putObjectRequest = new PutObjectRequest(
				OssUtil.bucketName, key, is);
		client.putObject(putObjectRequest);
	}


	//上传一个文件，File
	public static void uploadFile(File file, String key) {
		OSSClient client = client();
		PutObjectRequest putObjectRequest = new PutObjectRequest(
				OssUtil.bucketName, key, file);
		client.putObject(putObjectRequest);
	}


	//下载一个文件到本地
	public static OSSObject downloadFile(String key) {
		OSSClient client = client();
		GetObjectRequest getObjectRequest = new GetObjectRequest(
				OssUtil.bucketName, key);
		OSSObject object = client.getObject(getObjectRequest);
		return object;
	}


	//上传某个文件到某个目录，key是自动生成的
	public static String uploadFile(MultipartFile file, String dir)
			throws IOException {
		if (null != file && !file.isEmpty() && file.getSize() > 0) {
			String fileName = UuidUtil.get32UUID()
					+ "."
					+ StringUtils.substringAfterLast(
							file.getOriginalFilename(), ".");
			String ymd = DateUtil.getDays();
			String key = dir + ymd + "/" + fileName;
			OssUtil.uploadFile(file.getInputStream(), key);
			return key;
		}
		return null;
	}


	//删除某个文件
	public static void delete(String key) {
		if (BackendConst.OSS_DELTE_IMG) {
			try {
				client().deleteObject(OssUtil.bucketName, key);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}


	//创建目录，不能以斜杠“/”开头
	public static void makeDir(String keySuffixWithSlash) {
		OSSClient client = client();
		/*
		 * Create an empty folder without request body, note that the key must
		 * be suffixed with a slash
		 */
		if (StringUtils.isEmpty(keySuffixWithSlash)) {
			return;
		}
		if (!keySuffixWithSlash.endsWith("/")) {
			keySuffixWithSlash += "/";
		}
		client.putObject(bucketName, keySuffixWithSlash,
				new ByteArrayInputStream(new byte[0]));
	}


	// 实时的分页查询
	public static OssPage listPage(String dir, String nextMarker,
			Integer maxKeys) {
		OSSClient client = client();
		ListObjectsRequest listObjectsRequest = new ListObjectsRequest(
				bucketName);
		if (StringUtils.isNoneBlank(dir)) {
			listObjectsRequest.setPrefix(dir);
		}
		if (StringUtils.isNoneBlank(nextMarker)) {
			listObjectsRequest.setMarker(nextMarker);
		}
		if (maxKeys != null) {
			listObjectsRequest.setMaxKeys(maxKeys);
		}
		ObjectListing objectListing = client.listObjects(listObjectsRequest);


		List summrayList = objectListing.getObjectSummaries();
		List itemList = summaryToItem(summrayList);
		OssPage page = new OssPage();


		String newxNextMarker = objectListing.getNextMarker();
		page.setNextMarker(newxNextMarker);
		page.setSummrayList(itemList);
		return page;
	}


	//把OSS的对象，转换成自己的。因为OSS的对象没有实现Serialiable，不能序列化。
	private static List summaryToItem(
			List summrayList) {
		List itemList = new ArrayList();
		for (OSSObjectSummary summary : summrayList) {
			OssItem item = new OssItem();
			try {
				BeanUtils.copyProperties(item, summary);
				itemList.add(item);
			} catch (IllegalAccessException | InvocationTargetException e) {
				e.printStackTrace();
			}
		}
		return itemList;
	}


	//一次迭代，获得某个目录下的所有文件列表
	public static List listAll(String dir) {
		OSSClient client = client();
		List list = new ArrayList();
		// 查询
		ObjectListing objectListing = null;
		String nextMarker = null;
		final int maxKeys = 1000;


		do {
			ListObjectsRequest listObjectsRequest = new ListObjectsRequest(
					bucketName).withPrefix(dir).withMarker(nextMarker)
					.withMaxKeys(maxKeys);
			objectListing = client.listObjects(listObjectsRequest);


			List summrayList = objectListing
					.getObjectSummaries();
			List itemList = summaryToItem(summrayList);
			list.addAll(itemList);
			nextMarker = objectListing.getNextMarker();
		} while (objectListing.isTruncated());
		return list;
	}


	public static void p(Object str) {
		System.out.println(str);
	}


	public static void print(OSSException oe) {
		p("Caught an OSSException, which means your request made it to OSS, "
				+ "but was rejected with an error response for some reason.");
		p("Error Message: " + oe.getErrorCode());
		p("Error Code:       " + oe.getErrorCode());
		p("Request ID:      " + oe.getRequestId());
		p("Host ID:           " + oe.getHostId());
	}
}

${imgDomain}/${imgUrl}@100w @100w是缩略图语法
 http://b.img-cn-hangzhou.aliyuncs.com/product/xiaolei.jpg@100w

 oss.properties
 oss.endpoint = http://oss-cn-hangzhou.aliyuncs.com
 oss.accessKeyId=hi
 oss.accessKeySecret=hi
 oss.bucketName=b


 oss.fileDomain=http://b.oss-cn-hangzhou.aliyuncs.com
 oss.imgDomain=http://b.img-cn-hangzhou.aliyuncs.com