How to read txt file in java

Two methods to read TXT files using Java: use FileReader and BufferedReader to read the file line by line. Use Files.readAllLines() to read all lines of a file at once.

How to read TXT files using Java

Introduction
Read TXT Files are a common task in Java for working with text data. There are several ways to achieve this, and this article will cover the two most common ones.

Method 1: Use FileReader and BufferedReader

import java.io.BufferedReader;
import java.io.FileReader;

public class ReadTxtFile1 {

    public static void main(String[] args) {
        // 文件路径
        String filePath = "example.txt";

        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
            // 逐行读取文件
            String line;
            while ((line = br.readLine()) != null) {
                // 处理每一行
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Method 2: Use Files.readAllLines()

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class ReadTxtFile2 {

    public static void main(String[] args) {
        // 文件路径
        String filePath = "example.txt";

        try {
            // 一次性读取文件所有行
            List<String> lines = Files.readAllLines(Paths.get(filePath));

            // 处理每一行
            for (String line : lines) {
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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