将字符串以文本的形式保存到本地

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;

/**
 * File tools
 *
 * @author Abner_阿锋
 * @version 1.0
 * @date 2021/12/8
 */
public class FileUtils {
    private static final String TAG = "FileUtils";
    // 将字符串写入到文本文件中
    public static void writeTxtToFile(String content, String filePath, String fileName) {
        //生成文件夹之后，再生成文件，不然会出错
        makeFile(filePath, fileName);
        String mFilePath = filePath + fileName;
        // 每次写入时，都换行写
        String mContent = content + "rn";
        try {
            File file = new File(mFilePath);
            if (!file.exists()) {
                LogUtils.logD(TAG, "创建文件: " + mFilePath);
                file.getParentFile().mkdirs();
                file.createNewFile();
            }
            RandomAccessFile mRandomAccessFile = new RandomAccessFile(file, "rwd");
            mRandomAccessFile.seek(file.length());
            mRandomAccessFile.write(mContent.getBytes());
            mRandomAccessFile.close();
        } catch (IOException e) {
            LogUtils.logD(TAG, "写入错误: " + e.toString());
        }
    }
    //生成文件
    public static File makeFile(String filePath, String fileName) {
        File file = null;
        makeDirectory(filePath);
        try {
            file = new File(filePath + fileName);
            if (!file.exists()) {
                file.createNewFile();
            }
        } catch (IOException e) {
            LogUtils.logD(TAG, "生成文件错误: " + e.toString());
        }
        return file;
    }
    //生成文件夹
    public static void makeDirectory(String filePath) {
        File file = null;
        try {
            file = new File(filePath);
            if (!file.exists()) {
                file.mkdir();
            }
        } catch (Exception e) {
            LogUtils.logD(TAG, "生成文件夹错误: " + e.toString());
        }
    }
}

调用

        String mContent = "阿锋真帅，阿锋真帅，阿锋真帅，重要的事情说三遍";
        String mPath ="/sdcard/data/data/";
        FileUtils.writeTxtToFile(mContent, mPath, "afeng.txt");

微语

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