解析 Redis 的 dump.rdb 文件的 Java 開發包

jopen 10年前發布 | 36K 次閱讀 Redis NoSQL數據庫 java-redis-rdb

java-redis-rdb 是一個用來解析 Redis 的 dump.rdb 文件的 Java 開發包。

RDB文件具有以下結構

 ----------------------------# RDB is a binary format. There are no new lines or spaces in the file.
52 45 44 49 53              # Magic String "REDIS"


30 30 30 33                 # RDB Version Number in big endian. In this case, version = 0003 = 3


FE 00                       # FE = code that indicates database selector. db number = 00
----------------------------# Key-Value pair starts
FD $unsigned int            # FD indicates "expiry time in seconds". After that, expiry time is read as a 4 byte unsigned int
$value-type                 # 1 byte flag indicating the type of value - set, map, sorted set etc.
$string-encoded-key         # The key, encoded as a redis string


$encoded-value              # The value. Encoding depends on $value-type


FC $unsigned long           # FC indicates "expiry time in ms". After that, expiry time is read as a 8 byte unsigned long
$value-type                 # 1 byte flag indicating the type of value - set, map, sorted set etc.
$string-encoded-key         # The key, encoded as a redis string


$encoded-value              # The value. Encoding depends on $value-type


$value-type                 # This key value pair doesn't have an expiry. $value_type guaranteed != to FD, FC, FE and FF
$string-encoded-key


$encoded-value


FE $length-encoding         # Previos db ends, next db starts. Database number read using length encoding.


...                         # Key value pairs for this database, additonal database


FF                          ## End of RDB file indicator
8 byte checksum             ## CRC 64 checksum of the entire file.</code></pre> 
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