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 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 100024365*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>