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Read CSV File Java

Last Updated : Mar 11, 2024

Read CSV File Java

In this article we will show you the solution of read csv file java, the CSV file is an abbreviation for Comma-Separated Values.

It's a straightforward plain-text data format that divides tabular data into columns in basic text formats, like a database or spreadsheet, and stores them in columns. Commas are frequently used as the data separator (,).

Programs like Microsoft Word and Excel, that store data in tables, allow us to import and export files as in CSV format.

To identify and distinguish various data tokens within a file, the CSV format uses delimiters. When transferring tabular data across programmes that are designed to work with different file types natively, we use the CSV file format. Now move to the concept of read csv file java.

Step By Step Guide On Read CSV File Java :-

There are numerous ways to read a CSV file using the Java Scanner class.

The function Object() for the Scanner class returns values that have been read from the provided file.

The token form is used to separate the data. It makes use of a delimiter pattern that by design corresponds to white space.

Afterwards, the resulting tokens were converted into values of different types using the next() methods.

OpenCSV is a third-party API that offers standard libraries for reading different versions of CSV files.

Better control over handling the CSV file is provided by the library. TDF (Tab-Delimited File) files can be read by the library.

import java.util.Scanner;
public class ReadCSVEx1
public static void main(String[] args) throws Exception
Scanner sc = new Scanner(new File("E:\\CSVDemo.csv"));
while (sc.hasNext())
  1. The first line of code imports the package names as*. All of the classes needed for input as well as output operations are present in it. By using the Java I/O API, we may handle files in Java.
  2. After that, we import the java.uti.scanner package. Java's util package contains a class called Scanner that is used to obtain input of primitive types like int, double, and so on as well as strings.
  3. Next, the public class ReadCSVEx1 is created, and its main function, which throws exceptions, is called. This indicates that the main method does not catch any exceptions; rather, it deals with IOExceptions by throwing them to the source that called the main method.
  4. The csv file we wish to read is parsed and then sent into the scanner class' function Object().
  5. The delimiter pattern is then set using useDelimiter. Java's Scanner class has a method called useDelimiter() that is used to define the delimiting pattern for the current Scanner.
  6. Next, we examine the Scanner's input to see if another token is there using the hasNext() method. A delimiter pattern that by default matches whitespace is used by a scanner to separate its input into tokens.
  7. The following step is to discover and return a next entire token from in this scanner using the next function.
  8. Finally, we close the scanner using the close method.

Conclusion :-

Thus, we have successfully mastered the Java idea of reading a csv file.

Also, we discovered that the Scanner class's Object() function returns data that has been read from supplied file.

And a third-party API called OpenCSV provides standard libraries that reading various CSV file versions.

I hope this article on read csv file java helps you and the steps and method mentioned above are easy to follow and implement.

Author Image About Riya

A recent graduate with a Bachelor of Technology (B.Tech) in Computer Science from India. She is passionate about leveraging technology to solve real-world problems. With a strong foundation and experience in programming languages such as Python, Django, HTML, CSS, and JavaScript, java, php and have honed her skills through hands-on projects and coursework.

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