使用者建立的Bucket總共有三種許可權：

/*私有
 * 只允許自己讀寫操作，其他使用者沒有許可權
 */
CannedAccessControlList acl_private = CannedAccessControlList.Private;
		
/*公共讀寫
 * 允許自己和其他使用者讀寫操作
 */
CannedAccessControlList acl_pub_readwrite = CannedAccessControlList.PublicReadWrite;
		
/*公共讀
 * 只允許自己進行寫操作，但是允許自己及其他使用者進行讀操作
 */
CannedAccessControlList acl_pub_red = CannedAccessControlList.PublicRead;
 

測試demo

package com.ls;

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

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.CreateBucketRequest;
import com.aliyun.oss.model.GetObjectRequest;
import com.aliyun.oss.model.ObjectMetadata;
import com.aliyun.oss.model.PutObjectResult;

/**檔案讀寫許可權測試，需要兩個賬號
 */
public class OSSAccessExample {
	/*公司賬號*/
	private static final String ACCESS_ID1 = "*******************";
	private static final String ACCESS_KEY1 = "************************";

	/*自己賬號*/
	private static final String ACCESS_ID2 = "***************";
	private static final String ACCESS_KEY2 = "**********************";

	private static final String OSS_ENDPOINT = "http://oss.aliyuncs.com/";

	public static void main(String[] args) {
		
		// 初始化OSS客戶端
		OSSClient client1 = new OSSClient(OSS_ENDPOINT, ACCESS_ID1, ACCESS_KEY1);
		OSSClient client2 = new OSSClient(OSS_ENDPOINT, ACCESS_ID2, ACCESS_KEY2);

		// key1建立名為saas01的BUCKET，許可權為私有
		createBucket(client1, "saas01", CannedAccessControlList.Private);

		// key2建立名為saas02的BUCKET，許可權為公用讀寫
		createBucket(client2, "saas02", CannedAccessControlList.PublicReadWrite);

		// key1建立名為saas03的BUCKET，許可權為公用讀
		createBucket(client1, "saas03", CannedAccessControlList.PublicRead);
		
		/*上傳檔案*/
		
		String bucketName1 = "saas01";
		String key1 = "索隆Q版.jpg";
		String uploadFilePath1 = "G:/test/索隆Q版.jpg";
		
		String bucketName2 = "saas02";
		String key2 = "女帝.jpg";
		String uploadFilePath2 = "G:/test/女帝.jpg";
		
		String bucketName3 = "saas03";
		String key3 = "啟動日誌.txt";
		String uploadFilePath3 = "G:/test/啟動日誌.txt";
		
		
		try {
			/*對各自的bucket操作，都有許可權*/
			System.out.println("正在上傳...");
			uploadFile(client1, bucketName1, key1, uploadFilePath1);
			uploadFile(client2, bucketName2, key2, uploadFilePath2);
			uploadFile(client1, bucketName3, key3, uploadFilePath3);
		} catch (OSSException e) {
			e.printStackTrace();
		} catch (ClientException e) {
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		
		System.out.println("上傳私有...");
		try {
			uploadFile(client2, bucketName1, key1+"(上傳私有)", uploadFilePath1);		
		} catch (Exception e) {
			System.out.println(e.getMessage());//無寫入許可權，丟擲異常
		}
		
		System.out.println("上傳只讀...");
		try {
			uploadFile(client2, bucketName3, key3+"(上傳只讀)", uploadFilePath3);
		} catch (Exception e) {
			System.out.println(e.getMessage());//無寫入許可權，丟擲異常
		}
		
		System.out.println("上傳公共讀寫...");
		try {
			uploadFile(client1, bucketName2, key2+"(上傳公共讀寫)", uploadFilePath2);
		} catch (Exception e) {
			System.out.println(e.getMessage());//成功上傳，無異常
		}

		
		List<Bucket> list1 = new ArrayList<Bucket>();
		list1 = client1.listBuckets();
		System.out.println("client1:" + client1.toString());
		for (Bucket a : list1) {
			System.out.println("client1 info:" + a.toString());
		}
		
		list1 = client2.listBuckets();
		System.out.println("client2:" + client2.toString());
		for (Bucket a : list1) {
			System.out.println("client2 info:" + a.toString());
		}
		
		/*自己下載自己的*/
		System.out.println("正在下載（自己下載自己的）...");
        downloadFile(client1, bucketName1, key1, "G:/test/download/"+key1);
        downloadFile(client2, bucketName2, key2, "G:/test/download/"+key2);
        downloadFile(client1, bucketName3, key3, "G:/test/download/"+key3);
        
        /*下載私有的*/
        System.out.println("正在下載（下載私有）...");
        try {
        	downloadFile(client2, bucketName1, key1, "G:/test/download/(下載私有)"+key1);
		} catch (Exception e) {
			 System.out.println(e.getMessage());//此處會丟擲異常，無許可權下載
		}
           
        System.out.println("正在下載（下載只讀）...");
        try {
        	downloadFile(client2, bucketName3, key3, "G:/test/download/(下載只讀)"+key3);
		} catch (Exception e) {
			System.out.println(e.getMessage());//成功下載
		}
        
        
        System.out.println("正在下載（下載公共讀寫）...");
        try {
        	downloadFile(client1, bucketName2, key2, "G:/test/download/(下載公共讀寫)"+key2);
		} catch (Exception e) {
			System.out.println(e.getMessage());//成功下載
		}
		
		client1.shutdown();
		client2.shutdown();
		System.out.println("-----------------------SUCCESS----------------------");
	}

	public static void createBucket(OSSClient client, String bucketName,
			CannedAccessControlList acl) {

		/* 通過一個Bucket物件來建立 */
		CreateBucketRequest bucketObj = new CreateBucketRequest(null);// 建構函式入參為Bucket名稱，可以為空
		bucketObj.setBucketName(bucketName);// 設定bucketObj名稱
		bucketObj.setCannedACL(acl);// 設定bucketObj訪問許可權acl
		client.createBucket(bucketObj);// 建立Bucket

	}

	// 上傳檔案
	private static void uploadFile(OSSClient client, String bucketName,
			String key, String filename) throws OSSException, ClientException,
			FileNotFoundException {
		File file = new File(filename);

		ObjectMetadata objectMeta = new ObjectMetadata();
		objectMeta.setContentLength(file.length());
		// 可以在metadata中標記檔案型別
		//objectMeta.setContentType("image/jpeg");

		InputStream input = new FileInputStream(file);
		PutObjectResult rs = client.putObject(bucketName, key, input,
				objectMeta);
	}

	// 下載檔案
	private static void downloadFile(OSSClient client, String bucketName,
			String key, String filename) throws OSSException, ClientException {
		client.getObject(new GetObjectRequest(bucketName, key), new File(
				filename));
	}

}