java - Flat file Comparison Tool -

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flatfile1.txt 

hdr06112016flatfile     txt   clm12345     abcdef....   dtl12345     100a00....   dtl12345     200b00....   clm54321     abcdef....   dtl54321     100c00....   dtl54321     200d00....

flatfile2.txt 

hdr06112016flatfile     txt   clm54321     fedcba....   dtl54321     100c00....   dtl54321     200d00....   clm12345     abcdef....   dtl12345     100a00....   dtl12345     200b00....

mapping both file same: 

header:   field       startposition       endpos       length    identifier       1                 3           3   date             4                12           8   , on

clm:

field       startposition       endpos       length    identifier       1                 3           3   key              4                12           8   data            13                19           6   , on

dtl:

field       startposition       endpos       length    identifier       1                 3           3   key              4                12           8   , on

this sample file , may size upto 500mb , 50 fields. need compare 2 files based on mapping. file format - 1 header , claim data(12345) in 1 line , detail data can more one. these claims can present randomly in other file.its not line line mapping. detail data ordering same in both files.

desired output : 

for key 54321 , data(pos 13:19) not same.

would please me in comparing 2 files? feasible in java since file size huge?.

java work fine. don't need have files entirely in memory; can open them both , read both incrementally, comparing go along.


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