JAVA 阿里雲的OOS文件上傳和下載

在項目中，通常需要加載一些圖片，js和css的靜態資源，如果放在自己的服務器裏面太消耗資源，而阿里雲的oos是有CDN加速的，在看了oos的文檔之後，寫了一個工具類，貼出代碼方便以後複用：

package com.weijie.core.util.aliyun;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import com.aliyun.oss.ClientException;
import com.aliyun.oss.OSSClient;
import com.aliyun.oss.OSSException;
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;

/**
 * 阿里雲OSS相關java API
 * @author xiaoxia
 *øø
 */
public class AliyunOssUtil {
	 

   /**
    *  刪除一個Bucket和其中的Objects 
    * @param client
    * @param bucketName
    * @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();
            // 如果不爲空，先刪除bucket下的文件
            client.deleteObject(bucketName, objectName);
        }
        client.deleteBucket(bucketName);
    }

    /**
     *  把Bucket設置爲所有人可讀
     * @param client
     * @param bucketName
     * @throws OSSException
     * @throws ClientException
     */
    public static void setBucketPublicReadable(OSSClient client, String bucketName)
            throws OSSException, ClientException {
        //創建bucket
        client.createBucket(bucketName);

        //設置bucket的訪問權限，public-read-write權限
        client.setBucketAcl(bucketName, CannedAccessControlList.PublicRead);
    }

    /**
     *  上傳文件
     * @param client
     * @param bucketName
     * @param key
     * @param filename
     * @param contentType default "image/gif"
     * @throws OSSException
     * @throws ClientException
     * @throws FileNotFoundException
     */
    public static String uploadFile(OSSClient client, String bucketName, String key, String filename,String contentType)
            throws OSSException, ClientException, FileNotFoundException {
        File file = new File(filename);
        contentType = contentType == null ? "image/gif" : contentType;
        ObjectMetadata objectMeta = new ObjectMetadata();
        objectMeta.setContentLength(file.length());
        objectMeta.setContentType(contentType);
        InputStream input = new FileInputStream(file);
        PutObjectResult result =  client.putObject(bucketName, key, input, objectMeta);
        return result.getETag();
    }

    /**
     * 下載文件
     * @param client
     * @param bucketName
     * @param key
     * @param filename
     * @throws OSSException
     * @throws ClientException
     */
    public static void downloadFile(OSSClient client, String bucketName, String key, String filename)
            throws OSSException, ClientException {
        client.getObject(new GetObjectRequest(bucketName, key),
                new File(filename));
    }
    
    /**
     * 創建一個文件夾
     * @param client
     * @param bucketName
     * @param folderPah
     */
    public static void createFolder(OSSClient client,String bucketName,String folderPah){
		ObjectMetadata objectMeta = new ObjectMetadata();
		byte[] buffer = new byte[0];
		ByteArrayInputStream in = new ByteArrayInputStream(buffer);
		objectMeta.setContentLength(0);
		try {
		    client.putObject(bucketName, folderPah, in, objectMeta);
		}catch(Exception e){
			e.printStackTrace();
		} finally {
		    try {
				in.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
	}
    }
    
    /**
     * 刪除一個OSS文件對象
     * @param client
     * @param bucketName
     * @param key
     */
    public static void deleteObject(OSSClient client, String bucketName, String key){
    	client.deleteObject(bucketName, key);
    }
    
    public static void main(String[] args) {
//    	http://njck-dianliao.oss-cn-shanghai.aliyuncs.com/gift/crown.png
    	OSSClient client=new OSSClient("http://oss-cn-shanghai.aliyuncs.com", "***<>", "****<>");
    	downloadFile(client, "njck", "gift/crown.png", "E://1.png");
	}
}