OSS阿里雲文件上傳 demo。

所需jar包：
aliyun-openservices-1.2.3.jar
jdom-1.1.jar
commons-codec-1.4.jar
commons-logging-1.1.1.jar
gson-2.2.4.jar
httpclient-4.1.3.jar
httpcore-4.1.4.jar
protobuf-java-2.4.1.jar


實體類：
package com.xcfh.aliyun;

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

import com.aliyun.openservices.ClientConfiguration;
import com.aliyun.openservices.ClientException;
import com.aliyun.openservices.ServiceException;
import com.aliyun.openservices.oss.OSSClient;
import com.aliyun.openservices.oss.OSSErrorCode;
import com.aliyun.openservices.oss.OSSException;
import com.aliyun.openservices.oss.model.CannedAccessControlList;
import com.aliyun.openservices.oss.model.GetObjectRequest;
import com.aliyun.openservices.oss.model.OSSObjectSummary;
import com.aliyun.openservices.oss.model.ObjectListing;
import com.aliyun.openservices.oss.model.ObjectMetadata;


/**
 * 
 *@ClassName: TestOSS
 * 
 *@Description: 該示例代碼展示了如果在OSS中創建和刪除一個Bucket，以及如何上傳和下載一個文件。
 * 
 * 該示例代碼的執行過程是：
 * 1. 創建一個Bucket（如果已經存在，則忽略錯誤碼）；
 * 2. 上傳一個文件到OSS；
 * 3. 下載這個文件到本地；
 * 4. 清理測試資源：刪除Bucket及其中的所有Objects。
 * 
 * 嘗試運行這段示例代碼時需要注意：
 * 1. 為了展示在刪除Bucket時除了需要刪除其中的Objects,
 *    示例代碼最后為刪除掉指定的Bucket，因為不要使用您的已經有資源的Bucket進行測試！
 * 2. 請使用您的API授權密鑰填充ACCESS_ID和ACCESS_KEY常量；
 * 3. 需要准確上傳用的測試文件，並修改常量uploadFilePath為測試文件的路徑；
 *    修改常量downloadFilePath為下載文件的路徑。
 * 4. 該程序僅為示例代碼，僅供參考，並不能保證足夠健壯。
 *OSS Java API手冊：http://aliyun_portal_storage.oss.aliyuncs.com/oss_api/oss_javahtml/index.html?spm=5176.7150518.1996836753.8.d5TjaG
 *OSS Java SDK開發包:http://help.aliyun.com/view/13438814.html
 *OSSClient:www.mvnrepository.com/artifact/cglib/cglib/2.2
 *@author PineTree
 *@date 2014年12月1日 下午3:23:32
 *@version
 */
public class TestOSS {
	/**
	 * 阿里雲ACCESS_ID
	 */
	private static String ACCESS_ID = "你的ACCESS_ID";
	/**
	 * 阿里雲ACCESS_KEY 
	 */
	private	 static String ACCESS_KEY = "你的ACCESS_KEY";
	/**
	 * 阿里雲OSS_ENDPOINT  青島Url
	 */
	private static String OSS_ENDPOINT = "http://oss-cn-qingdao.aliyuncs.com";
	
	/**
	 * 阿里雲BUCKET_NAME  OSS
	 */
	private static String BUCKET_NAME = "demo10";
	
	
	public static void main(String[] args) {
		//String bucketName = "demo10";
		String Objectkey = "photo1.jpg";
		
		String uploadFilePath = "D:\\photo.jpg";
		String downloadFilePath = "D:\\photo1.jpg";
		
		// 使用默認的OSS服務器地址創建OSSClient對象,不叫OSS_ENDPOINT代表使用杭州節點，青島節點要加上不然包異常
	    OSSClient client = new OSSClient(OSS_ENDPOINT, ACCESS_ID, ACCESS_KEY);
	    
	    //如果你想配置OSSClient的一些細節的參數，可以在構造OSSClient的時候傳入ClientConfiguration對象。 
	    //ClientConfiguration是OSS服務的配置類，可以為客戶端配置代理，最大連接數等參數。
	    //具體配置看http://aliyun_portal_storage.oss.aliyuncs.com/oss_api/oss_javahtml/OSSClient.html#id2
	    //ClientConfiguration conf = new ClientConfiguration();
	    //OSSClient client = new OSSClient(OSS_ENDPOINT, ACCESS_ID, ACCESS_KEY, conf);

	    
	    try {
	    	ensureBucket(client, BUCKET_NAME);
            setBucketPublicReadable(client, BUCKET_NAME);

            System.out.println("正在上傳...");
            uploadFile(client, BUCKET_NAME, Objectkey, uploadFilePath);

            System.out.println("正在下載...");
            downloadFile(client, BUCKET_NAME, Objectkey, downloadFilePath);
        }catch(Exception e){
        	e.printStackTrace();
        } finally {
            deleteBucket(client, BUCKET_NAME);
        }
	}
	
	/**
	 * 創建Bucket
	 * 
	 * @param client  OSSClient對象
	 * @param bucketName  BUCKET名
	 * @throws OSSException
	 * @throws ClientException
	 */
	public static void ensureBucket(OSSClient client, String bucketName)throws OSSException, ClientException{
		try{
			client.createBucket(bucketName);
		}catch(ServiceException e){
			if(!OSSErrorCode.BUCKES_ALREADY_EXISTS.equals(e.getErrorCode())){
				throw e;
			}
		}
	}
	
	/**
	 * 刪除一個Bucket和其中的Objects
	 * 
	 * @param client  OSSClient對象
	 * @param bucketName  Bucket名
	 * @throws OSSException
	 * @throws ClientException
	 */
	private 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);
			//如果不為空，先刪除bucket下的文件
			client.deleteObject(bucketName, objectName);
		}
		client.deleteBucket(bucketName);
	}
	
	/**
	 * 把Bucket設置成所有人可讀
	 * 
	 * @param client  OSSClient對象
	 * @param bucketName  Bucket名
	 * @throws OSSException
	 * @throws ClientException
	 */
	private 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  OSSClient對象
	 * @param bucketName  Bucket名
	 * @param Objectkey  上傳到OSS起的名
	 * @param filename  本地文件名
	 * @throws OSSException
	 * @throws ClientException
	 * @throws FileNotFoundException
	 */
	private static void uploadFile(OSSClient client, String bucketName, String Objectkey, String filename)
			throws OSSException, ClientException, FileNotFoundException{
		File file = new File(filename);
		ObjectMetadata objectMeta = new ObjectMetadata();
		objectMeta.setContentLength(file.length());
		//判斷上傳類型，多的可根據自己需求來判定
		if (filename.endsWith("xml")) {
			objectMeta.setContentType("text/xml");
		}
		else if (filename.endsWith("jpg")) {
			objectMeta.setContentType("image/jpeg");
		}
		else if (filename.endsWith("png")) {
			objectMeta.setContentType("image/png");
		}
		
		InputStream input = new FileInputStream(file);
		client.putObject(bucketName, Objectkey, input, objectMeta);
	}
	
	/**
	 *  下載文件
	 * 
	 * @param client  OSSClient對象
	 * @param bucketName  Bucket名
	 * @param Objectkey  上傳到OSS起的名
	 * @param filename 文件下載到本地保存的路徑
	 * @throws OSSException
	 * @throws ClientException
	 */
    private static void downloadFile(OSSClient client, String bucketName, String Objectkey, String filename)
            throws OSSException, ClientException {
        client.getObject(new GetObjectRequest(bucketName, Objectkey),
                new File(filename));
    }
}