版权声明：未经博主同意切勿转载 https://blog.csdn.net/qq_32136827/article/details/84849973
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<String, String> getFileName(final String fileAbsolutePath) {
Map<String, String> 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/";
}