解析 Redis 的 dump.rdb 文件的 Java 开发包
jopen
10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.