package com.example.fileutils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import android.content.Context;
import android.os.Environment;
public class UtilsFile {
/**
* SD卡的状态
*/
public static final String SDCARDSTATE = Environment.getExternalStorageState();
/**
* 文件在SD卡中存储的根路径
*/
public static final String SDCARDPATH = Environment.getExternalStorageDirectory().getPath();
/**
* 获取包名下files的路径
* @param context
* @return 包名/files
*/
public static String getFilePath(Context context){
return context.getApplicationContext().getFilesDir().getPath();
}
public static String getCahePath(Context context){
return context.getApplicationContext().getCacheDir().getPath();
}
/**
* 保存文件
* @param data 数据内容
* @param path 绝对路径
* @param fileName 文件名
* @return true 保存成功，false 保存失败
*/
public static boolean saveFile(String data,String path,String fileName){
File file = new File(path);
if (!file.exists()) {
file.mkdirs();
}
file = new File(file, fileName);
try {
FileOutputStream out = new FileOutputStream(file);
out.write(data.getBytes());
out.flush();
out.close();
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 读取文件
* @param path
* @return
*/
public static String readFile(String path) {
File file = new File(path);
if (!file.isFile()) {
try {
throw new Exception("it's not a file,please check!");
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
StringBuffer sb = new StringBuffer();
try {
FileInputStream in = new FileInputStream(file);
byte[] b = new byte[in.available()];
int read = in.read(b);
while (read != -1) {
sb.append(new String(b));
read = in.read(b);
}
in.close();
} catch (Exception e) {
e.printStackTrace();
return null;
}
return sb.toString();
}
/**
* 删除路径下的：文件和文件夹，包括当前文件夹
* @param filepath ：绝对路径
* @return true:删除成功，false：删除失败
* 注意：当前路径不存在时，也返回true
*/
public static boolean deletFile(String absoluteFilePath) {
File file = new File(absoluteFilePath);
try {
if(!file.exists()){
return true;
}
if (file.isFile()) {
file.delete();
return true;
}
if (!absoluteFilePath.endsWith(File.separator)){
absoluteFilePath = absoluteFilePath + File.separator;
}
if (file.isDirectory()) {
if (file.listFiles().length == 0) {
file.delete();
} else {
File[] files = file.listFiles();
for (File dirFile : files) {
deletFile(dirFile.getAbsolutePath());
}
}
file.delete();
}
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
public static boolean saveToCahe(String data,String dir,String fileName,Context context){
String path = getCahePath(context)+dir;
return saveFile(data, path, fileName);
}
public static String readFromCahe(String dir,Context context){
String path = getCahePath(context)+dir;
return readFile(path);
}
public static boolean deletInCahe(String dir,Context context){
String path = getCahePath(context)+dir;
return deletFile(path);
}
public static boolean clearCahe(Context context){
return deletFile(getCahePath(context));
}
/**
* 将文件保存到应用包名/files目录下
* @param data 要保存的内容
* @param dir 保存的相对路径，不包括文件名："/myproject/function1/aa"
* @param fileName 文件名称："1.txt"
* @return
*/
public static boolean saveToFile(String data,String dir,String fileName,Context context){
String path = getFilePath(context)+dir;
return saveFile(data, path, fileName);
}
/**
* 从应用包名/files目录下读取文件
* @param dir ："/dd/1.txt"
* @param context
* @return
*/
public static String readFromFile(String dir,Context context){
String path = getFilePath(context)+dir;
return readFile(path);
}
public static boolean deletInFile(String dir,Context context){
String path = getFilePath(context)+dir;
return deletFile(path);
}
/**
* 保存数据到SD卡上，
* @param String data：要保存的数据内容
* @param String dir：文件的相对路径,"/aa/bb"
* @param String fileName：文件名,"1.txt"
* @return boolean 是否保存成功，true保存成功，false保存失败
*/
public static boolean saveToSDCard(String data, String dir, String fileName) {
if (!Environment.MEDIA_MOUNTED.equals(SDCARDSTATE)) {
try {
throw new Exception("SDCard state error");
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
return saveFile(data, SDCARDPATH+dir, fileName);
}
/**
* @param String RelativePath 文件在sd卡中的路径："/bb/dd/1.txt"
* @return String 文件内容
*/
public static String getFromSDCard(String dir) {
String path = SDCARDPATH + dir;
return readFile(path);
}
/**
* 从SD卡上删除文件
* @param path
* @return 是否删除文件成功
*/
public static boolean deletFileInSDCard(String path) {
return deletFile(SDCARDPATH + path);
}
}