解析 Redis 的 dump.rdb 文件的 Java 开发包

jopen 11年前

java-redis-rdb 是一个用来解析 Redis 的 dump.rdb 文件的 Java 开发包。

RDB文件具有以下结构

 ----------------------------# 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.

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