They needed to Modernize.
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To obtain Natural Resources that would strengthen the Japanese military
According to primary sources, ie newspapers, journals and diaries the nation came to realize that it would be a long and bloody war after the Battle of Shiloh in April of 1862.
Later battles would have been bloodier.
The battle brought near parity between Japanese and American carrier forces in the Pacific and removed the threat to Hawaii that a Japanese victory would have brought. It also permanently stopped Japanese expansion to that area of the Pacific.
Pearl Harbor in Hawaii was attacked by air by the Japanese by 3 waves of planes, the Japanese used the zero's and attacked battleship row, dealing a massive blow to the United States Navy, and if the Japanese would of sent the 4 wave which i believe would have been troops, they would of taken over hawaii.