Java Program to read excel file and extract data accordingly into Java collections (preferably hashmap) - repost

i have an excel file and it contains few columns of data. basically the excel is having multiple parts of data separated by "Condition" namely Condition 1, Condition 2 .... Condition X. Each conditions are divided into two columns, one is input another is output. Input and Output is then divided into two columns, namely Field and Value. I need all the Fields and Values being extracted from the excel file and grouped according to Input and Output then again grouped under its corresponding "Condition" name and all to be in Java collections.