@Override
public PartResult call() throws Exception {
PartResult tr = null;
RandomAccessFile output = null;
InputStream content = null;
try {
DownloadPart downloadPart = downloadCheckPoint.downloadParts.get(partIndex);
tr = new PartResult(partIndex + 1, downloadPart.start, downloadPart.end);
output = new RandomAccessFile(downloadFileRequest.getDownloadFile(), "rw");
output.seek(downloadPart.start);
GetObjectRequest getObjectRequest =
new GetObjectRequest(downloadFileRequest.getBucketName(), downloadFileRequest.getKey());
getObjectRequest.setMatchingETagConstraints(
downloadFileRequest.getMatchingETagConstraints());
getObjectRequest.setNonmatchingETagConstraints(
downloadFileRequest.getNonmatchingETagConstraints());
getObjectRequest.setModifiedSinceConstraint(
downloadFileRequest.getModifiedSinceConstraint());
getObjectRequest.setUnmodifiedSinceConstraint(
downloadFileRequest.getUnmodifiedSinceConstraint());
getObjectRequest.setResponseHeaders(downloadFileRequest.getResponseHeaders());
getObjectRequest.setRange(downloadPart.start, downloadPart.end);
OSSObject ossObj = objectOperation.getObject(getObjectRequest);
objectMetadata = ossObj.getObjectMetadata();
content = ossObj.getObjectContent();
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
int bytesRead = 0;
while ((bytesRead = content.read(buffer)) != -1) {
output.write(buffer, 0, bytesRead);
}
downloadCheckPoint.update(partIndex, true);
if (downloadFileRequest.isEnableCheckpoint()) {
downloadCheckPoint.dump(downloadFileRequest.getCheckpointFile());
}
} catch (Exception e) {
tr.setFailed(true);
tr.setException(e);
logException(String.format("Task %d:%s upload part %d failed: ", id, name, partIndex), e);
} finally {
if (output != null) {
output.close();
}
if (content != null) {
content.close();
}
}
return tr;
}
public static void readContent(String bucketName, String key, OSSClient client)
throws IOException {
BufferedReader br = null;
try {
OSSObject objec = client.getObject(bucketName, key);
br = new BufferedReader(new InputStreamReader(objec.getObjectContent()));
String line = br.readLine();
while (line != null) {
System.out.println(line);
line = br.readLine();
}
System.out.println("读完啦！");
} catch (Exception e) {
System.err.println(e);
} finally {
br.close();
}
}
/** * 下载文件 * * @author [email protected] * @param fileId * @return * @throws IOException */ public FileInfo download(String fileId) throws IOException { logger.debug("download file from OSS--start"); if (fileId == null || fileId.equals("")) { throw new IllegalArgumentException("fileId不能为null或者空字符串"); } OSSClient client = this.getOSSClient(); OSSObject ossObject = client.getObject(bucketName, fileId); FileInfo fileInfo = new FileInfo(); InputStream is = ossObject.getObjectContent(); byte[] content = IOUtils.readStreamAsByteArray(is); checkContent(content); ObjectMetadata objectMetadata = ossObject.getObjectMetadata(); String fileName = objectMetadata.getUserMetadata().get("filename"); fileInfo.setFileContent(content); fileInfo.setFileName(fileName); logger.debug("download file from OSS--end"); return fileInfo; }
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();
}
}