'How To Shorten URLs: Java and Spring Step-By-Step Guide' tutorialforbeginners tutorial
). When using a hash function, it is certain that different inputs will result in different outputs. The result of the hash is longer than seven characters, so we would need to take the first seven characters. But, in this case, there could be a collision because the first seven characters could already be in use as a short link. Then, we take the next seven characters, until we find a short link that is not used..
Using base 62 in URL conversion with a maximum length of seven characters allows us to have 62^7 unique values for short links.We have a base 10 number that we want to convert to base 62. We are going to use the following algorithm:After that, we just need to map the numbers from the result collection to the base 62 Alphabet=[0,1,2,…,a,b,c…,A,B,C,…].
1st iteration: number=1000 remainder=1000 % 62=8 number=1000 / 62=16 result list=[8] 2nd iteration: number=16 remainder=16 % 62=16 number=16 / 62=0 result list=[16,8] There is no more iterations since number=0 after 2nd iterationConverting from base 62 to base 10 is also simple:
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