package com.mzeat.util;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import android.content.Context;
import android.os.Environment;
import android.os.StatFs;
import android.util.Log;
/**
* 文件操作工具包
* @author liux (http://my.oschina.net/liux)
* @version 1.0
* @created 2012-3-21
*/
public class FileUtils
{
/**
* 写文本文件
* 在Android系统中，文件保存在 /data/data/PACKAGE_NAME/files 目录下
* @param context
* @param msg
*/
public static void write(Context context, String fileName, String content)
{
if( content == null ) content = "";
try
{
FileOutputStream fos = context.openFileOutput(fileName, Context.MODE_PRIVATE);
fos.write( content.getBytes() );
fos.close();
}
catch (Exception e)
{
e.printStackTrace();
}
}
/**
* 读取文本文件
* @param context
* @param fileName
* @return
*/
public static String read( Context context, String fileName )
{
try
{
FileInputStream in = context.openFileInput(fileName);
return readInStream(in);
}
catch (Exception e)
{
e.printStackTrace();
}
return "";
}
private static String readInStream(FileInputStream inStream)
{
try
{
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[512];
int length = -1;
while((length = inStream.read(buffer)) != -1 )
{
outStream.write(buffer, 0, length);
}
outStream.close();
inStream.close();
return outStream.toString();
}
catch (IOException e)
{
Log.i("FileTest", e.getMessage());
}
return null;
}
public static File createFile( String folderPath, String fileName )
{
File destDir = new File(folderPath);
if (!destDir.exists())
{
destDir.mkdirs();
}
return new File(folderPath, fileName + fileName );
}
/**
* 向手机写图片
* @param buffer
* @param folder
* @param fileName
* @return
*/
public static boolean writeFile( byte[] buffer, String folder, String fileName )
{
boolean writeSucc = false;
boolean sdCardExist = Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
String folderPath = "";
if( sdCardExist )
{
folderPath = Environment.getExternalStorageDirectory() + File.separator + folder + File.separator;
}
else
{
writeSucc =false;
}
File fileDir = new File(folderPath);
if(!fileDir.exists())
{
fileDir.mkdirs();
}
File file = new File( folderPath + fileName );
FileOutputStream out = null;
try
{
out = new FileOutputStream( file );
out.write(buffer);
writeSucc = true;
}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
try {out.close();} catch (IOException e) {e.printStackTrace();}
}
return writeSucc;
}
/**
* 根据文件绝对路径获取文件名
* @param filePath
* @return
*/
public static String getFileName( String filePath )
{
if( StringUtils.isEmpty(filePath) ) return "";
return filePath.substring( filePath.lastIndexOf( File.separator )+1 );
}
/**
* 根据文件的绝对路径获取文件名但不包含扩展名
* @param filePath
* @return
*/
public static String getFileNameNoFormat( String filePath){
if(StringUtils.isEmpty(filePath)){
return "";
}
int point = filePath.lastIndexOf('.');
return filePath.substring(filePath.lastIndexOf(File.separator)+1,point);
}
/**
* 获取文件扩展名
* @param fileName
* @return
*/
public static String getFileFormat( String fileName )
{
if( StringUtils.isEmpty(fileName) ) return "";
int point = fileName.lastIndexOf( '.' );
return fileName.substring( point+1 );
}
/**
* 获取文件大小
* @param filePath
* @return
*/
public static long getFileSize( String filePath )
{
long size = 0;
File file = new File( filePath );
if(file!=null && file.exists())
{
size = file.length();
}
return size;
}
/**
* 获取文件大小
* @param size 字节
* @return
*/
public static String getFileSize(long size)
{
if (size <= 0) return "0";
java.text.DecimalFormat df = new java.text.DecimalFormat("##.##");
float temp = (float)size / 1024;
if (temp >= 1024)
{
return df.format(temp / 1024) + "M";
}
else
{
return df.format(temp) + "K";
}
}
/**
* 转换文件大小
* @param fileS
* @return B/KB/MB/GB
*/
public static String formatFileSize(long fileS) {
java.text.DecimalFormat df = new java.text.DecimalFormat("#.00");
String fileSizeString = "";
if (fileS < 1024) {
fileSizeString = df.format((double) fileS) + "B";
} else if (fileS < 1048576) {
fileSizeString = df.format((double) fileS / 1024) + "KB";
} else if (fileS < 1073741824) {
fileSizeString = df.format((double) fileS / 1048576) + "MB";
} else {
fileSizeString = df.format((double) fileS / 1073741824) + "G";
}
return fileSizeString;
}
/**
* 获取目录文件大小
* @param dir
* @return
*/
public static long getDirSize(File dir) {
if (dir == null) {
return 0;
}
if (!dir.isDirectory()) {
return 0;
}
long dirSize = 0;
File[] files = dir.listFiles();
for (File file : files) {
if (file.isFile()) {
dirSize += file.length();
} else if (file.isDirectory()) {
dirSize += file.length();
dirSize += getDirSize(file); //递归调用继续统计
}
}
return dirSize;
}
/**
* 获取目录文件个数
* @param f
* @return
*/
public long getFileList(File dir){
long count = 0;
File[] files = dir.listFiles();
count = files.length;
for (File file : files) {
if (file.isDirectory()) {
count = count + getFileList(file);//递归
count--;
}
}
return count;
}
public static byte[] toBytes(InputStream in) throws IOException
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
int ch;
while ((ch = in.read()) != -1)
{
out.write(ch);
}
byte buffer[]=out.toByteArray();
out.close();
return buffer;
}
/**
* 检查文件是否存在
* @param name
* @return
*/
public static boolean checkFileExists(String name) {
boolean status;
if (!name.equals("")) {
File path = Environment.getExternalStorageDirectory();
File newPath = new File(path.toString() + name);
status = newPath.exists();
} else {
status = false;
}
return status;
}
/**
* 计算SD卡的剩余空间
* @return 返回-1，说明没有安装sd卡
*/
public static long getFreeDiskSpace() {
String status = Environment.getExternalStorageState();
long freeSpace = 0;
if (status.equals(Environment.MEDIA_MOUNTED)) {
try {
File path = Environment.getExternalStorageDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
freeSpace = availableBlocks * blockSize / 1024;
} catch (Exception e) {
e.printStackTrace();
}
} else {
return -1;
}
return (freeSpace);
}
/**
* 新建目录
* @param directoryName
* @return
*/
public static boolean createDirectory(String directoryName) {
boolean status;
if (!directoryName.equals("")) {
File path = Environment.getExternalStorageDirectory();
File newPath = new File(path.toString() + directoryName);
status = newPath.mkdir();
status = true;
} else
status = false;
return status;
}
/**
* 检查是否安装SD卡
* @return
*/
public static boolean checkSaveLocationExists() {
String sDCardStatus = Environment.getExternalStorageState();
boolean status;
if (sDCardStatus.equals(Environment.MEDIA_MOUNTED)) {
status = true;
} else
status = false;
return status;
}
/**
* 删除目录(包括：目录里的所有文件)
* @param fileName
* @return
*/
public static boolean deleteDirectory(String fileName) {
boolean status;
SecurityManager checker = new SecurityManager();
if (!fileName.equals("")) {
File path = Environment.getExternalStorageDirectory();
File newPath = new File(path.toString() + fileName);
checker.checkDelete(newPath.toString());
if (newPath.isDirectory()) {
String[] listfile = newPath.list();
// delete all files within the specified directory and then
// delete the directory
try {
for (int i = 0; i < listfile.length; i++) {
File deletedFile = new File(newPath.toString() + "/"
+ listfile[i].toString());
deletedFile.delete();
}
newPath.delete();
Log.i("DirectoryManager deleteDirectory", fileName);
status = true;
} catch (Exception e) {
e.printStackTrace();
status = false;
}
} else
status = false;
} else
status = false;
return status;
}
/**
* 删除文件
* @param fileName
* @return
*/
public static boolean deleteFile(String fileName) {
boolean status;
SecurityManager checker = new SecurityManager();
if (!fileName.equals("")) {
File path = Environment.getExternalStorageDirectory();
File newPath = new File(path.toString() + fileName);
checker.checkDelete(newPath.toString());
if (newPath.isFile()) {
try {
Log.i("DirectoryManager deleteFile", fileName);
newPath.delete();
status = true;
} catch (SecurityException se) {
se.printStackTrace();
status = false;
}
} else
status = false;
} else
status = false;
return status;
}
}