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YouTube: 

Spring MVC Annotation | Controller, Configuration, RequestMapping, ComponentScan

https://www.youtube.com/watch?v=MNgliKze8oI

Important java example:

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https://www.programcreek.com/java-api-examples/index.php?project_name=in28minutes%2FSpringMvcStepByStep#

Memory : 

https://www.youtube.com/watch?v=1JXZiIpllAM

Inserting And Retrieving the Images in Java.

https://www.thecrazyprogrammer.com/2016/01/save-and-retrieve-image-from-mysql-database-using-java.html

https://stackoverflow.com/questions/37857478/how-to-retrieve-image-file-from-database-using-java

https://www.websparrow.org/spring/how-to-fetch-image-from-database-using-spring-mvc

https://www.youtube.com/watch?v=RWcNcsYDhvQ

Read the data from one inputfile and write the data into another output file.

https://www.tutorialspoint.com/how-to-read-data-from-one-file-and-print-to-another-file-in-java

Read the csv file all at once ....and read the civ file line by line. example.

https://www.geeksforgeeks.org/reading-csv-file-java-using-opencsv/

Writing the data to csv file line by line and all at once....

https://www.geeksforgeeks.org/writing-a-csv-file-in-java-using-opencsv/?ref=lbp

Important Example for csv file................................................

http://opencsv.sourceforge.net/