// endpoint以杭州为例，其它region请按实际情况填写String endpoint = "http://oss-cn-hangzhou.aliyuncs.com";// accessKey请登录https://ak-console.aliyun.com/#/查看String accessKeyId = "<yourAccessKeyId>";String accessKeySecret = "<yourAccessKeySecret>";String content = "Hello OSS";// 创建OSSClient实例OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);AppendObjectRequest appendObjectRequest = new AppendObjectRequest("<yourBucketName>",         "<yourKey>", new ByteArrayInputStream(content.getBytes()));// 第一次追加appendObjectRequest.setPosition(0L);AppendObjectResult appendObjectResult = ossClient.appendObject(appendObjectRequest);// 第二次追加appendObjectRequest.setPosition(appendObjectResult.getNextPosition());appendObjectResult = ossClient.appendObject(appendObjectRequest);// 第三次追加appendObjectRequest.setPosition(appendObjectResult.getNextPosition());appendObjectResult = ossClient.appendObject(appendObjectRequest);// 关闭clientossClient.shutdown();

import java.io.ByteArrayInputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStreamWriter;import java.io.Writer;import com.aliyun.oss.ClientException;import com.aliyun.oss.OSSClient;import com.aliyun.oss.OSSException;import com.aliyun.oss.model.AppendObjectRequest;import com.aliyun.oss.model.AppendObjectResult;import com.aliyun.oss.model.OSSObject;/** * This sample demonstrates how to upload an object by append mode  * to Aliyun OSS using the OSS SDK for Java. */public class AppendObjectSample {        private static String endpoint = "*** Provide OSS endpoint ***";    private static String accessKeyId = "*** Provide your AccessKeyId ***";    private static String accessKeySecret = "*** Provide your AccessKeySecret ***";        private static String bucketName = "*** Provide bucket name ***";    private static String key = "*** Provide key ***";        public static void main(String[] args) throws IOException {                /*         * Constructs a client instance with your account for accessing OSS         */        OSSClient client = new OSSClient(endpoint, accessKeyId, accessKeySecret);                try {                        /*             * Append an object from specfied input stream, keep in mind that             * position should be set to zero at first time.             */            String content = "Thank you for using Aliyun Object Storage Service";            InputStream instream = new ByteArrayInputStream(content.getBytes());            Long firstPosition = 0L;            System.out.println("Begin to append object at position(" + firstPosition + ")");            AppendObjectResult appendObjectResult = client.appendObject(                    new AppendObjectRequest(bucketName, key, instream).withPosition(0L));            System.out.println("\tNext position=" + appendObjectResult.getNextPosition() +                     ", CRC64=" + appendObjectResult.getObjectCRC() + "\n");                        /*             * Continue to append the object from specfied file descriptor at last position             */            Long nextPosition = appendObjectResult.getNextPosition();            System.out.println("Continue to append object at last position(" + nextPosition + "):");            appendObjectResult = client.appendObject(                    new AppendObjectRequest(bucketName, key, createTempFile())                    .withPosition(nextPosition));            System.out.println("\tNext position=" + appendObjectResult.getNextPosition() +                     ", CRC64=" + appendObjectResult.getObjectCRC());                        /*             * View object type of the appendable object             */            OSSObject object = client.getObject(bucketName, key);            System.out.println("\tObject type=" + object.getObjectMetadata().getObjectType() + "\n");            // Do not forget to close object input stream if not use it any more            object.getObjectContent().close();                        /*             * Delete the appendable object             */            System.out.println("Deleting an appendable object");            client.deleteObject(bucketName, key);                    } catch (OSSException oe) {            System.out.println("Caught an OSSException, which means your request made it to OSS, "                    + "but was rejected with an error response for some reason.");            System.out.println("Error Message: " + oe.getErrorCode());            System.out.println("Error Code:       " + oe.getErrorCode());            System.out.println("Request ID:      " + oe.getRequestId());            System.out.println("Host ID:           " + oe.getHostId());        } catch (ClientException ce) {            System.out.println("Caught an ClientException, which means the client encountered "                    + "a serious internal problem while trying to communicate with OSS, "                    + "such as not being able to access the network.");            System.out.println("Error Message: " + ce.getMessage());        } finally {            /*             * Do not forget to shut down the client finally to release all allocated resources.             */            client.shutdown();        }    }        private static File createTempFile() throws IOException {        File file = File.createTempFile("oss-java-sdk-", ".txt");        file.deleteOnExit();        Writer writer = new OutputStreamWriter(new FileOutputStream(file));        writer.write("abcdefghijklmnopqrstuvwxyz\n");        writer.write("0123456789011234567890\n");        writer.close();        return file;    }}