Version 1.30  2023-01-29
  * support tracker server fail over
    If the tracker server is not specified, when the tracker server fails to
    get the connection, it will try to get the connection from other tracker servers.
    The maximum number of attempts is the number of tracker servers minus 1

Version 1.29  2020-01-03
  * support active test for connection pool.
    when the tracker / storage server restarts or the network burst failure
    occurs, only one request will be sacrificed (failed), the rest of
    the connections in the pool will be enabled to active test for validation.

Version 1.28  2019-12-30
  * support connection pool. you can use connection pool or a short connection.
    configuration items please see fdfs_client.conf and client.properties
  * you must upgrade your FastDFS server to V6.06 or higher version

Version 1.27  2019-11-11
  * StorageClient add function: regenerate_filename for appender file
    StorageClient1 add function: regenerate_filename1 for appender file
  * you must upgrade your FastDFS server to V6.02 or higher version

Version 1.26  2017-04-17
  * IniFileReader use getResourceAsStream first
  * change charactor encoding to UTF-8

Version 1.25  2014-12-07
  * support connection stats since FastDFS Server v5.04

Version 1.24  2012-12-01
  * bug fixed: StorageClient.get_file_info support appender file and 
    slave file correctly

Version 1.23  2012-11-18
  * query_file_info changed, you must 
    upgrade your FastDFS server to V4.03 or higher version

Version 1.22  2012-10-06
  * group and storage stat both add 1 field, you must 
    upgrade your FastDFS server to V4.00 or higher version

Version 1.21  2012-06-25
  * add exception class MyException
  * class IniFileReader same as FastDHT java client

Version 1.20  2012-05-27
  * appender file support truncate and modify operation
  * storage stat add 6 fields, you must upgrade your
    FastDFS server to V3.08 or higher version

Version 1.19  2011-05-29
  * storage stat add field if_trunk_server, you must upgrade your
    FastDFS server to V3.00 or higher version
  * tracker or storage close no throw IOException (silence close)

Version 1.18  2011-01-29
  * storage stat support total_upload_bytes, success_upload_bytes, 
    total_download_bytes and success_download_bytes etc. 18 fields
    you must upgrade your FastDFS server to V2.08 or higher version
  * StorageClient add functions: get_file_info and query_file_info,
    StorageClient1 add functions: get_file_info1 and query_file_info1

Version 1.17  2011-01-09
  * slave file's prefix name can be empty,
    you must upgrade your FastDFS server to V2.07 or higher version
  * support list group stats and storage stats
  * support delete storage server
  * add monitor class: org.csource.fastdfs.test.Monitor
  
Version 1.16  2010-10-17
  * upload file can get available storage server list of the group, 
    you must upgrade your FastDFS server to V2.01 or higher version

Version 1.15  2010-08-07
  * protocol reponse command changed. you must upgrade your FastDFS server
    to V2.00 or higher version
  * upload file protocol changed, you must upgrade your FastDFS server
    to V2.00 or higher version

Version 1.14  2010-06-22
  * bug fixed: delete the new created local file when download_file to 
    local file fail
  * support connect timeout for connecting, the network timeout used to 
    read and write

Version 1.13  2010-05-30
  * org.csource.fastdfs.ProtoCommon add method genSlaveFilename
  * support ACTIVE_TEST command. you must upgrade your FastDFS server
    to V1.28 or higher version

Version 1.12  2009-11-27
  * support uploading slave file
  * file ext name change from 5 to 6, you must upgrade your FastDFS server
    to V1.23 or higher version

Version 1.11  2009-10-22
  * correct interface / class name from beginning with Dowload to Download
  * auto reconnect with reused connection when IOException ocurs
  * test classes move to package org.csource.fastdfs.test
  * add classes org.csource.fastdfs.UploadStream and 
    org.csource.fastdfs.DownloadStream for streaming writing or reading
    
Version 1.10  2009-10-04
  * support multi-tracker server group, you can make multi 
    org.csource.fastdfs.TrackerClient instances for each tracker server group
  
Version 1.9  2009-10-01
  * add load test class: org.csource.fastdfs.TestLoad
  * network IO performance enhancement
  * upload file support callback for sending file content

Version 1.8  2009-08-30
  * TrackerClient, in function getConnection, add synchronized to avoid conflict
  * support file URL with token 
  
Version 1.7  2009-08-01
  * support cmd TRACKER_PROTO_CMD_SERVICE_QUERY_FETCH_ALL: query all storage 
    servers, you must upgrade your FastDFS server to V1.19 or higher version
    
Version 1.6  2009-05-24
  * download file support offset and download bytes, you must upgrade your
    FastDFS server to V1.18 or higher version

Version 1.5  2009-02-14
  * client can specify group name when upload file, you must upgrade your
    FastDFS server to V1.16 or higher version
    
Version 1.4  2008-11-10
  * upload file support ext name, you must upgrade your
    FastDFS server to V1.12 or higher version
  * upload protocol add field store_path_index (1 byte)
  * add method TrackerClient.getUpdateStorage. to support getmeta, setmeta 
    and delete file
  * TrackerClient.getFetchStorage bug fixed

Version 1.3  2008-10-16
  * client download file support callback function(class)
  * add class "StorageClient1" and function "TrackerClient.getFetchStorage1" 
    to combine 2 fields: group name and filename to 1 field: file id
  * add anothor client test program: TestClient1.java to use file id

Version 1.2  2008-09-08
  * communication protocol changed to support large file exceed 2GB: 
    all integer field is 8 bytes big-endian, 
    you must upgrade your FastDFS server to V1.8 or higher version

Version 1.1  2008-08-10
  * upload file package remove the one pad byte field, you must upgrade your
    FastDFS server to V1.4 or higher version

Version 1.0  2008-08-03
  * first version