Use java's FileWriter.append() function to append a string to the end of the file

Use Java's FileWriter.append() function to append a string to the end of the file

In Java programming, file reading and writing operations are often involved. Sometimes, we may need to append new content to the end of the existing file content. Java provides a simple way to achieve this function, which is to use the append() function of the FileWriter class.

FileWriter is a class in the Java IO library for writing character streams. It provides multiple methods for writing characters, among which the append() function is one of the methods used to append a string to the end of the file.

The following is a sample code that demonstrates how to use the FileWriter.append() function to append a string to the end of the file:

import java.io.FileWriter;
import java.io.IOException;

public class AppendToFileExample {

    public static void main(String[] args) {
        String fileName = "example.txt";
        String contentToAppend = "This is the new content to be appended to the file.";

        try {
            FileWriter fileWriter = new FileWriter(fileName, true); // 创建FileWriter对象，第二个参数为true表示以追加模式打开文件
            fileWriter.append(contentToAppend); // 使用append()方法将字符串内容追加到文件末尾
            fileWriter.close(); // 关闭文件写入器
            System.out.println("Content appended to file successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

In the above code, we first define the string to be appended The content contentToAppend and the file name to append fileName. Then, we create a FileWriter object, passing in the file name and append mode (true) as parameters. Next, call the FileWriter's append() function to append contentToAppend to the end of the file. Finally, close the file writer and output a prompt message indicating that the append is successful.

It should be noted that when using the FileWriter.append() function to append a string, if the file does not exist, it will automatically create a new file; if the file already exists, the appended content will be added directly to the file. end.

In addition, it should be noted that since FileWriter uses a character stream to write, data corruption may occur when writing non-text files. If you need to write to a non-text file, it is recommended to use a byte stream (such as FileOutputStream) to operate.

To summarize, by using Java's FileWriter.append() function, we can easily append string content to the end of the file. This provides us with more flexible and convenient options in file operations to meet different needs. Whether appending log information or adding new data to a file, FileWriter.append() is a very useful method.

The above is the detailed content of Use java's FileWriter.append() function to append a string to the end of the file. For more information, please follow other related articles on the PHP Chinese website!