阿里云OSS 文件上传下载工具类

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSSClient;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.Bucket;
import com.aliyun.oss.model.CannedAccessControlList;
import com.aliyun.oss.model.GetObjectRequest;
import com.aliyun.oss.model.OSSObjectSummary;
import com.aliyun.oss.model.ObjectListing;
import com.aliyun.oss.model.ObjectMetadata;
import com.aliyun.oss.model.PutObjectResult;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.URL;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
* @describe: 文件上传下载到OSS的工具类
* @author:houkai
* @Date: 2018/3/7 14:54
* @version 1.0
*/
public class OSSUtil {

private static final String SLANT = "/";
private static final String DOT = ".";
public static final String ETag = "ETag";
public static final String OSSFilePathName = "OSSFilePathName";
/**
 * 上传文件到OSS服务器
 *
 * @param client OSSClient
 * @param file 原文件
 * @param bucketName bucket名称
 * @param ossFilePath oss文件路径
 * @param ossFileName oss文件名（文件名未包含拓展名）
 * @return result 出参Map中包含两个参数：
 *                ETag 返回的MD5Key
 *                OSSFilePathName OSS文件路径
 */
public static Map<String, String> uploadFile (OSSClient client, File file, String bucketName, String ossFilePath, String ossFileName) {
    Map<String, String> result = new HashMap<>(2);
    InputStream in = new FileInputStream(file);
    if (file != null && file.exists()) {
        String oriFileName = file.getName();
        //截取拓展名;
        String fileExtension = oriFileName.substring(oriFileName.lastIndexOf(DOT));
        StringBuffer ossPath = new StringBuffer();
        ossPath.append(ossFilePath);
        if (!ossFilePath.endsWith(SLANT)) {
            ossPath.append(SLANT);
        }
        //拼接OSS文件路径
        ossPath.append(ossFileName);
        Long fileSize = file.length();
        ObjectMetadata metadata = new ObjectMetadata();
        metadata.setContentLength(in.available());
        metadata.setCacheControl("no-cache");
        metadata.setContentEncoding("utf-8");
        metadata.setHeader("Pragma", "no-cache");
        metadata.setContentType(FileExtensionEnum.getContentTypeByExtension(fileExtension));
        metadata.setContentDisposition("filename/filesize=" + ossFileName + "/" + fileSize + "Byte.");
        PutObjectResult putResult = client.putObject(bucketName, ossPath.toString(), in, metadata);
        //MD5值
        result.put(ETag, putResult.getETag());
        //oss 文件路径 + 文件名 /test/test.png
        result.put(OSSFilePathName, ossPath.toString());
    }
    return result;
}

/**
 * 新建Bucket
 * @param client
 * @param bucketName
 * @return
 */
public static final boolean addBucket(OSSClient client, String bucketName) {
    Bucket bucket = client.createBucket(bucketName);
    return bucketName.equals(bucket.getName());
}

/**
 * 下载文件
 * @param client  OSSClient对象
 * @param bucketName    Bucket名
 * @param ossFilePath  上传到OSS起的全路径名
 * @param filename     文件下载到本地保存的路径
 * @throws OSSException
 * @throws ClientException
 */
public static void downloadFile(OSSClient client, String bucketName, String ossFilePath, String filename) {
    client.getObject(new GetObjectRequest(bucketName, ossFilePath), new File(filename));
}

/**
 * 删除一个Bucket和其中的Objects
 * @param client  OSSClient对象
 * @param bucketName  Bucket名
 * @throws OSSException
 * @throws ClientException
 */
public static void deleteBucket(OSSClient client, String bucketName)throws OSSException, ClientException{
    ObjectListing objectListing = client.listObjects(bucketName);
    List<OSSObjectSummary> listDeletes = objectListing.getObjectSummaries();
    for(int i = 0; i < listDeletes.size(); i++){
        String objectName = listDeletes.get(i).getKey();
        System.out.println("objectName = " + objectName);
        //如果不为空，先删除bucket下的文件
        client.deleteObject(bucketName, objectName);
    }
    client.deleteBucket(bucketName);
}

/**
 * 把Bucket设置成所有人可读
 * @param client  OSSClient对象
 * @param bucketName  Bucket名
 * @throws OSSException
 * @throws ClientException
 */
public static void setBucketPublicReadable(OSSClient client, String bucketName)throws OSSException, ClientException{
    //创建bucket
    client.createBucket(bucketName);
    //设置bucket的访问权限， public-read-write权限
    client.setBucketAcl(bucketName, CannedAccessControlList.PublicRead);
}

/**
 * 获得url链接
 * @param path 文件路径
 * @param ossClient
 * @param bucketName
 * @return
 */
public static String getUrl(String path, OSSClient ossClient, String bucketName, String activeTime) {
    // 设置URL过期时间为10年  3600l* 1000*24*365*10
    long time = 5 * 60000;
    if (StringUtil.isNotBlank(activeTime)) {
        time = Long.parseLong(activeTime) * 60000;
    }
    Date expiration = new Date(System.currentTimeMillis() + time);
    // 生成URL
    URL url = ossClient.generatePresignedUrl(bucketName, path, expiration);
    if (url != null) {
        return url.toString();
    }
    return null;
}

}

工具类涉及的maven依赖

<groupId>com.aliyun.oss</groupId>
<artifactId>aliyun-sdk-oss</artifactId>
<version>2.8.3</version>