java - How to compare two CSV file? -

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i have 2 csv file 1st 1 ip geo-location csv file , second 1 have date time , ip address how compare both file , make new csv file have date time ip address , ip location(country name).how make in java?

1st file

18102015 11:35:59  93.178.13.37:2065 18102015 11:36:00  93.178.13.37:2078 18102015 11:36:21  93.178.13.37:7251 18102015 11:37:05  222.35.153.160:502 18102015 11:37:05  222.35.153.160:5050

2nd file

93.178.0.0  93.178.63.255   1571946496  1571962879  sa  saudi arabia 93.178.64.0 93.178.127.255  1571962880  1571979263  ru  russian federation 222.16.0.0  222.95.255.255  3725590528  3730833407  cn  china

i want result:

18102015 11:35:59  93.178.13.37   2065    sa  saudi arabia  18102015 11:36:00  93.178.13.37   2078    sa  saudi arabia 18102015 11:36:21  93.178.13.37   7251    sa  saudi arabia 18102015 11:37:05  222.35.153.160  5029    cn   china   18102015 11:37:05  222.35.153.160  5050    cn   china

hints:

  • think of dotted ip address 4 octets of 32 bit number. example, ip address 93.178.63.255 (93*(2^24)) + (178*(2^16)) + (63*(2^8)) + 255. math, , come number represents ip address.

  • the second file has ip ranges (low high). if convert low , high ip addresses of range, you'll come 2 numbers. therefore, if you're trying detect if ip address (from file #1) within range (in file #2), it's simple. if ip >= lowip && ip <= highip it's in range.

  • further advice: parse file #2 , create objects each of them. object have notably starting ip address, ending ip address, , country. can parse file #1, search within collection of objects match, , output need to.


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