Android 读取本地txt文件和写入txt文件到本地

import android.util.Log;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.RandomAccessFile;/** * created by Administrator on 2018/8/28 19:37 */public class SaveDeviceMessageInfo {    public static String fileName = "id.txt";//保存设备ID    public static String rateName = "rate.txt";//保存设备收费标准    /**     * 保存设备ID     *     * @param deviceId 输入的设备ID     */    public static boolean saveDeviceId(String deviceId) {        File file = new File(Constant.PATH_SAVE_DEVICE + fileName);        if (file.exists()) {            FileUtil.delete(Constant.PATH_SAVE_DEVICE + fileName);        }        return writeTxtToFile(Base64Util.encode(deviceId), Constant.PATH_SAVE_DEVICE, fileName);//对保存的设备ID加密保存    }    /**     * 保存收费标准     *     * @param rate 输入的收费标准     */    public static boolean saveRate(String rate) {        File file = new File(Constant.PATH_RATE + rateName);        if (file.exists()) {            FileUtil.delete(Constant.PATH_RATE + rateName);        }        return writeTxtToFile(rate, Constant.PATH_RATE, rateName);//对保存的收费标准    }    /**     * 字符串写入本地txt     *     * @param strcontent 文件内容     * @param filePath   文件地址     * @param fileName   文件名     * @return 写入结果     */    private static boolean writeTxtToFile(String strcontent, String filePath, String fileName) {        boolean isSavaFile = false;        makeFilePath(filePath, fileName);        String strFilePath = filePath + fileName;        String strContent = strcontent + "\r\n";        try {            File file = new File(strFilePath);            if (!file.exists()) {                Log.d("TestFile", "Create the file:" + strFilePath);                file.getParentFile().mkdirs();                file.createNewFile();            }            RandomAccessFile raf = new RandomAccessFile(file, "rwd");            raf.seek(file.length());            raf.write(strContent.getBytes());            raf.close();            isSavaFile = true;        } catch (Exception e) {            isSavaFile = false;            Log.e("TestFile", "Error on write File:" + e);        }        return isSavaFile;    }    /**     * 生成文件     *     * @param filePath 文件地址     * @param fileName 文件名     */    private static File makeFilePath(String filePath, String fileName) {        File file = null;        makeRootDirectory(filePath);        try {            file = new File(filePath + fileName);            if (!file.exists()) {                file.createNewFile();            }        } catch (Exception e) {            e.printStackTrace();        }        return file;    }    /**     * 生成文件夹     */    public static void makeRootDirectory(String filePath) {        File file = null;        try {            file = new File(filePath);            if (!file.exists()) {                file.mkdir();            }        } catch (Exception e) {            Log.i("error:", e + "");        }    }    /**     * 读取本地文件     */    public static String readDeviceId() {        String path = Constant.PATH_SAVE_DEVICE + fileName;        StringBuilder stringBuilder = new StringBuilder();        File file = new File(path);        if (!file.exists()) {            return "";        }        if (file.isDirectory()) {            Log.e("TestFile", "The File doesn't not exist.");            return "";        } else {            try {                InputStream instream = new FileInputStream(file);                if (instream != null) {                    InputStreamReader inputreader = new InputStreamReader(instream);                    BufferedReader buffreader = new BufferedReader(inputreader);                    String line;                    while ((line = buffreader.readLine()) != null) {                        stringBuilder.append(line);                    }                    instream.close();                }            } catch (java.io.FileNotFoundException e) {                Log.e("TestFile", "The File doesn't not exist.");                return "";            } catch (IOException e) {                Log.e("TestFile", e.getMessage());                return "";            }        }        return Base64Util.decode(stringBuilder.toString());//对读到的设备ID解密    }    /**     * 读取本地文件     */    public static String readRate() {        String path = Constant.PATH_RATE + rateName;        StringBuilder stringBuilder = new StringBuilder();        File file = new File(path);        if (!file.exists()) {            return "";        }        if (file.isDirectory()) {            Log.e("TestFile", "The File doesn't not exist.");            return "";        } else {            try {                InputStream instream = new FileInputStream(file);                if (instream != null) {                    InputStreamReader inputreader = new InputStreamReader(instream);                    BufferedReader buffreader = new BufferedReader(inputreader);                    String line;                    while ((line = buffreader.readLine()) != null) {                        stringBuilder.append(line);                    }                    instream.close();                }            } catch (java.io.FileNotFoundException e) {                Log.e("TestFile", "The File doesn't not exist.");                return "";            } catch (IOException e) {                Log.e("TestFile", e.getMessage());                return "";            }        }        return stringBuilder.toString();//对读到的设备ID解密    }}

import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.util.HashMap;import java.util.Map;public class FileUtil {    /**     * 遍历所有文件     *     * @param fileAbsolutePath 传入的文件的父目录     */    public static Map getFileName(final String fileAbsolutePath) {        Map map = new HashMap<>();        File file = new File(fileAbsolutePath);        File[] subFile = file.listFiles();        try {            if (subFile.length > 0) {                for (int iFileLength = 0; iFileLength < subFile.length; iFileLength++) {                    // 判断是否为文件夹                    if (!subFile[iFileLength].isDirectory()) {                        String filename = subFile[iFileLength].getName();                        map.put(String.valueOf(iFileLength), filename);                    }                }            }        } catch (NullPointerException e) {            e.toString();        }        return map;    }    /**     * 读取日志文件     *     * @param file 本地txt或log文件     * @return 返回读取到的文件内容     */    public static String getFileContent(File file) {        String content = null;        try {            InputStream is = new FileInputStream(file);            InputStreamReader reader = new InputStreamReader(is);            BufferedReader bufferedReader = new BufferedReader(reader);            String line;            while ((line = bufferedReader.readLine()) != null) {                content = content + line + "\n";            }        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        } catch (NullPointerException e) {            e.toString();        }        return content;    }    /**     * 删除文件，可以是文件或文件夹     *     * @param fileName 要删除的文件名     * @return 删除成功返回true，否则返回false     */    public static boolean delete(String fileName) {        File file = new File(fileName);        if (!file.exists()) {            System.out.println("删除文件失败:" + fileName + "不存在！");            return false;        } else {            if (file.isFile())                return deleteFile(fileName);            else                return deleteDirectory(fileName);        }    }    /**     * 删除单个文件     *     * @param fileName 要删除的文件的文件名     * @return 单个文件删除成功返回true，否则返回false     */    public static boolean deleteFile(String fileName) {        File file = new File(fileName.replaceAll(" ", ""));        LogUtils.e("TAG", "fileName:" + fileName);        LogUtils.e("TAG", "file.isFile():" + file.isFile());        if (file.isFile() || file.exists()) {            boolean isDel = file.delete();            return isDel;        } else {            LogUtils.e("MainActivity", "删除单个文件失败：" + fileName + "不存在！");            return false;        }    }    /**     * 删除目录及目录下的文件     *     * @param dir 要删除的目录的文件路径     * @return 目录删除成功返回true，否则返回false     */    public static boolean deleteDirectory(String dir) {        // 如果dir不以文件分隔符结尾，自动添加文件分隔符        if (!dir.endsWith(File.separator))            dir = dir + File.separator;        File dirFile = new File(dir);        if ((!dirFile.exists()) || (!dirFile.isDirectory())) {            System.out.println("删除目录失败：" + dir + "不存在！");            return false;        }        boolean flag = true;        File[] files = dirFile.listFiles();        for (int i = 0; i < files.length; i++) {            if (files[i].isFile()) {                flag = deleteFile(files[i].getAbsolutePath());                if (!flag)                    break;            } else if (files[i].isDirectory()) {                flag = deleteDirectory(files[i]                        .getAbsolutePath());                if (!flag)                    break;            }        }        if (!flag) {            System.out.println("删除目录失败！");            return false;        }        if (dirFile.delete()) {            System.out.println("删除目录" + dir + "成功！");            return true;        } else {            return false;        }    }}

import android.os.Environment;import java.io.File;/** * Created by Administrator on 2018/10/18. */public class Constant {    /**     * 设备ID保存地址     */    public static String PATH_SAVE_DEVICE = Environment.getExternalStorageDirectory().getAbsolutePath()            + File.separator + "deviceId/";    /**     * 收费标准存放地址     * */    public static String PATH_RATE = Environment.getExternalStorageDirectory().getAbsolutePath()            + File.separator + "rate/";}

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