package com.demo.app.common;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 * @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;    }}