Java uses the read() function of the BufferedReader class to read the text content of the file

Java uses the read() function of the BufferedReader class to read the text content of the file

In Java, there are many ways to read the text content of the file. Among them, using the read() function of the BufferedReader class is a common and simple method. This article will introduce how to use the read() function of the BufferedReader class to read the text content of a file, and give corresponding code examples.

The BufferedReader class is an input stream in Java, which provides a method for reading text content line by line. By creating a BufferedReader object and calling its read() function, we can read text content one line at a time. Next, we will demonstrate how to read the text content of a file using the read() function of the BufferedReader class.

First, we need to open a text file. We can use the File class and FileReader class to implement this step. The following is a sample code:

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

public class ReadFileExample {
    public static void main(String[] args) {
        File file = new File("example.txt"); // 请替换成你的文件路径

        try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

In the above code, we first use the File class to create a File object, which represents the file we want to read. Here, we set the file name to "example.txt", you can modify it according to the actual situation.

Next, we use the try-with-resources statement to create a BufferedReader object that will read data from the file. During the reading process, we use a while loop and the readLine() function to read the text content line by line. Until the end of reading is reached, the readLine() function will return a null value and the loop will end.

After each line of text is read, we use the System.out.println() function to print it out. You can choose to perform other processing on the text content as needed, such as saving it to a List or array, etc.

In addition, we also need to handle IOException exceptions that may be thrown. In the above code, we use try-catch statement to catch and handle these exceptions.

It should be noted that when using the read() function of the BufferedReader class to read text content, if the file is large, it may cause excessive memory usage. At this time, you can consider using the read(char[] cbuf, int off, int len) function to divide the text content into several segments for reading to reduce memory consumption.

Summary:
This article introduces how to use the read() function of the BufferedReader class in Java to read the text content of a file. By creating a BufferedReader object and combining the while loop and the readLine() function, we can read the text content of the file line by line. At the same time, we also provide corresponding code examples to help readers better understand and apply this method.

Code example: Please prepare a text file yourself, replace the file path with the appropriate location in the code, and then run the code to view the text content of the file.

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