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trusktr on 10/16/10

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Last Edited at 10/16/10 08:45am

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How to read from a file in Java

/ Published in: Java

Use this to read from a file. It is wrapped in a try/catch statement in case something breaks when trying to read the file. It will simply throw and exception (error) and continue rather than crashing your app.

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import java.io.*
 
/**
 * This program reads a text file line by line and prints them to the console. It uses
 * FileReader and BufferedReader to read the file.
 * 
 */
public class FileInput {
 
	public static void main(String[] args) {
		File file = new File("MyFile.txt");
		FileReader fr = null;
		BufferedReader br = null;
		try {
			fr = new FileReader(file);
			br = new BufferedReader(fr);
			while (br.ready()) { // br.read() returns false when the Buffer is not ready (end of file).
				System.out.println(br.readLine()); // this statement reads a line from the file and prints it to the console (and moves to next line and is "ready" if there IS a next line).
			}
			br.close(); // dispose of the resources after using them.
		}
		catch (FileNotFoundException e) { // File not found.
			e.printStackTrace();
			// Put something here like an error message.
			System.out.println("The file could not be found.");
		}
		catch (IOException e) { // Error with transaction.
			e.printStackTrace();
			// Put something here like an error message.
			System.out.println("There was an error reading the file.");
		}
	}
}