Java operation Excel file

1. Reference 

• THEN
  • java uses POI to operate excel files, realize batch export, and import
  • Java - poi to operate Excel
  • Java uses poi to parse Excel files (compatible with 2007)
  • Summary of common methods for POI to operate Excel
  • POI parsing excel file
  • POI CellType
• JXL (seems to be out of date)
  • Java - operate Excel table, read table content
  • Summary of the use of jxl (java operation excel)

2. Demand

• The java program reads a column of data in an excel file,
• According to the given value, find from this column of data and return a value in the same row and another column

3. Realize 

• Use an off-the-shelf library to read the values ​​of two columns, the two values ​​in the same row form a hash value, and the two columns of data form a hash table
• Find the key of the hash table and return the corresponding value
• jar包：http://poi.apache.org/download.html
• Download: poi-bin-3.17-20170915.zip
• Use: poi-3.17.jar seems to work

4. Code