调用的API为：

String[] upload_file(

String group_name,//组名，不指定则可设为null

long file_size,//文件大小，必须制定

UploadCallback callback,//回调

String file_ext_name,

NameValuePair[] meta_list

)

 

 

/**
 * Upload File to DFS, directly transferring java.io.InputStream to java.io.OutStream
 * @author Poechant
 * @email zhongchao.ustc@gmail.com
 * @param fileBuff, file to be uploaded.
 * @param uploadFileName, the name of the file.
 * @param fileLength, the length of the file.
 * @return the file ID in DFS.
 * @throws IOException
 */
public String[] uploadFileByStream(InputStream inStream, String uploadFileName, long fileLength) throws IOException {

    String[] results = null;
    String fileExtName = "";
    if (uploadFileName.contains(".")) {
        fileExtName = uploadFileName.substring(uploadFileName.lastIndexOf(".") + 1);
    } else {
        logger.warn("Fail to upload file, because the format of filename is illegal.");
        return results;
    }

    TrackerClient tracker = new TrackerClient();
       TrackerServer trackerServer = tracker.getConnection();
       StorageServer storageServer = null;
       StorageClient1 client = new StorageClient1(trackerServer, storageServer);

       NameValuePair[] metaList = new NameValuePair[3];
       metaList[0] = new NameValuePair("fileName", uploadFileName);
       metaList[1] = new NameValuePair("fileExtName", fileExtName);
       metaList[2] = new NameValuePair("fileLength", String.valueOf(fileLength));

       try {
        // results[0]: groupName, results[1]: remoteFilename.
        results = client.upload_file(null, fileLength, new UploadFileSender(inStream), fileExtName, metaList);
    } catch (Exception e) {
        logger.warn("Upload file \"" + uploadFileName + "\"fails");
    }

        trackerServer.close();

    return results;
}

/**	 * Upload File to DFS, directly transferring java.io.InputStream to java.io.OutStream	 * @author Poechant	 * @email zhongchao.ustc@gmail.com	 * @param fileBuff, file to be uploaded.	 * @param uploadFileName, the name of the file.	 * @param fileLength, the length of the file.	 * @return the file ID in DFS.	 * @throws IOException 	 */	public String[] uploadFileByStream(InputStream inStream, String uploadFileName, long fileLength) throws IOException {				String[] results = null;		String fileExtName = "";		if (uploadFileName.contains(".")) {			fileExtName = uploadFileName.substring(uploadFileName.lastIndexOf(".") + 1);		} else {			logger.warn("Fail to upload file, because the format of filename is illegal.");			return results;		}				TrackerClient tracker = new TrackerClient();        TrackerServer trackerServer = tracker.getConnection();        StorageServer storageServer = null;        StorageClient1 client = new StorageClient1(trackerServer, storageServer);                NameValuePair[] metaList = new NameValuePair[3];        metaList[0] = new NameValuePair("fileName", uploadFileName);        metaList[1] = new NameValuePair("fileExtName", fileExtName);        metaList[2] = new NameValuePair("fileLength", String.valueOf(fileLength));                try {        	// results[0]: groupName, results[1]: remoteFilename.        	results = client.upload_file(null, fileLength, new UploadFileSender(inStream), fileExtName, metaList);		} catch (Exception e) {			logger.warn("Upload file \"" + uploadFileName + "\"fails");		}          		trackerServer.close();				return results;			}

其中的UploadFileSender是一个实现了UploadCallback接口的类：

 

private static class UploadFileSender implements UploadCallback {

    private InputStream inStream;

    public UploadFileSender(InputStream inStream) {
        this.inStream = inStream;
    }

    public int send(OutputStream out) throws IOException {
        int readBytes;
        while((readBytes = inStream.read()) > 0) {
            out.write(readBytes);
        }
        return 0;
    }
}

private static class UploadFileSender implements UploadCallback {				private InputStream inStream;				public UploadFileSender(InputStream inStream) {			this.inStream = inStream;		}				public int send(OutputStream out) throws IOException {			int readBytes;			while((readBytes = inStream.read()) > 0) {				out.write(readBytes);			}			return 0;		}	}