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How to read txt document using java

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Release： 2024-04-21 02:07:56

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Steps to use Java to read TXT documents: create a file object; create a file reader; create a buffered reader; read data line by line; close the reader.

How to read txt document using java

How to read TXT documents using Java

Reading TXT documents using Java is a simple process that only requires It takes a few steps to complete.

Step 1: Create a file object

First, you need to create a file object that represents the TXT document you want to read. To do this, use the File class:

<code class="java">File file = new File("path/to/file.txt");</code>

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Step 2: Create a file reader

Next, you need to create a file reader for FileReader Object to read data:

<code class="java">FileReader reader = new FileReader(file);</code>

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Step 3: Create a buffered reader

In order to read data more efficiently, you can create BufferedReader object wrapped around FileReader:

<code class="java">BufferedReader bufferedReader = new BufferedReader(reader);</code>

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Step 4: Read the data line by line

Now, you You can use the readLine() method of BufferedReader to read the data in the file line by line:

<code class="java">String line;
while ((line = bufferedReader.readLine()) != null) {
    // 读取到的文本行存储在 line 变量中
}</code>

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Step 5: Close the reader

After reading the file, be sure to close BufferedReader and FileReader to release system resources:

<code class="java">bufferedReader.close();
reader.close();</code>

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Sample code:

<code class="java">import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

public class ReadTxtFile {

    public static void main(String[] args) {
        try {
            // 创建文件对象
            File file = new File("path/to/file.txt");

            // 创建文件读取器
            FileReader reader = new FileReader(file);

            // 创建缓冲读取器
            BufferedReader bufferedReader = new BufferedReader(reader);

            // 逐行读取数据
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                // 读取到的文本行存储在 line 变量中
                System.out.println(line);
            }

            // 关闭读取器
            bufferedReader.close();
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}</code>

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