Android开发中的文件操作工具类FileUtil完整实例

package com.ymerp.android.tools;import java.io.BufferedReader;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.FileReader;import java.io.IOException;import java.io.InputStream;import java.io.LineNumberReader;import java.io.OutputStream;import java.io.Reader;import java.text.DecimalFormat;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.BitmapFactory;import android.os.Environment;import android.util.Log;import android.widget.Toast;/** * 文件操作工具 * * @author chen.lin * */public class FileUtil {  private static final String TAG = "FileUtil";  /**   * 从sd卡取文件   *   * @param filename   * @return   */  public String getFileFromSdcard(String filename) {    ByteArrayOutputStream outputStream = null;    FileInputStream fis = null;    try {      outputStream = new ByteArrayOutputStream();      File file = new File(Environment.getExternalStorageDirectory(), filename);      if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {        fis = new FileInputStream(file);        int len = 0;        byte[] data = new byte[1024];        while ((len = fis.read(data)) != -1) {          outputStream.write(data, 0, len);        }      }    } catch (Exception e) {      e.printStackTrace();    } finally {      try {        outputStream.close();        fis.close();      } catch (IOException e) {      }    }    return new String(outputStream.toByteArray());  }  /**   * 保存文件到sd   *   * @param filename   * @param content   * @return   */  public static boolean saveContentToSdcard(String filename, String content) {    boolean flag = false;    FileOutputStream fos = null;    try {      File file = new File(Environment.getExternalStorageDirectory(), filename);      if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {        fos = new FileOutputStream(file);        fos.write(content.getBytes());        flag = true;      }    } catch (Exception e) {      e.printStackTrace();      flag = false;    } finally {      try {        fos.close();      } catch (IOException e) {      }    }    return flag;  }  /**   * 取得文件大小   *   * @param f   * @return   * @throws Exception   */  @SuppressWarnings("resource")  public static long getFileSizes(File f) throws Exception {    long size = 0;    if (f.exists()) {      FileInputStream fis = null;      fis = new FileInputStream(f);      size = fis.available();    } else {      f.createNewFile();    }    return size;  }  /**   * 递归取得文件夹大小   *   * @param dir   * @return   * @throws Exception   */  public static long getFileSize(File dir) throws Exception {    long size = 0;    File flist[] = dir.listFiles();    for (int i = 0; i < flist.length; i++) {      if (flist[i].isDirectory()) {        size = size + getFileSize(flist[i]);      } else {        size = size + flist[i].length();      }    }    return size;  }  /**   * 转换文件大小   *   * @param fileS   * @return   */  public static String FormetFileSize(long fileS) {    DecimalFormat df = new DecimalFormat("#.00");    String fileSizeString = "";    if (fileS < 1024) {      fileSizeString = df.format((double) fileS) + "B";    } else if (fileS < 1048576) {      fileSizeString = df.format((double) fileS / 1024) + "K";    } else if (fileS < 1073741824) {      fileSizeString = df.format((double) fileS / 1048576) + "M";    } else {      fileSizeString = df.format((double) fileS / 1073741824) + "G";    }    return fileSizeString;  }  /**   * 递归求取目录文件个数   *   * @param f   * @return   */  public static long getlist(File f) {    long size = 0;    File flist[] = f.listFiles();    size = flist.length;    for (int i = 0; i < flist.length; i++) {      if (flist[i].isDirectory()) {        size = size + getlist(flist[i]);        size--;      }    }    return size;  }  /**   * 在根目录下搜索文件   *   * @param keyword   * @return   */  public static String searchFile(String keyword) {    String result = "";    File[] files = new File("/").listFiles();    for (File file : files) {      if (file.getName().indexOf(keyword) >= 0) {        result += file.getPath() + "/n";      }    }    if (result.equals("")) {      result = "找不到文件!!";    }    return result;  }  /**   * @detail 搜索sdcard文件   * @param 需要进行文件搜索的目录   * @param 过滤搜索文件类型   * */  public static List<String> search(File file, String[] ext) {    List<String> list = new ArrayList<String>();    if (file != null) {      if (file.isDirectory()) {        File[] listFile = file.listFiles();        if (listFile != null) {          for (int i = 0; i < listFile.length; i++) {            search(listFile[i], ext);          }        }      } else {        String filename = file.getAbsolutePath();        for (int i = 0; i < ext.length; i++) {          if (filename.endsWith(ext[i])) {            list.add(filename);            break;          }        }      }    }    return list;  }  /**   * 查询文件   *   * @param file   * @param keyword   * @return   */  public static List<File> FindFile(File file, String keyword) {    List<File> list = new ArrayList<File>();    if (file.isDirectory()) {      File[] files = file.listFiles();      if (files != null) {        for (File tempf : files) {          if (tempf.isDirectory()) {            if (tempf.getName().toLowerCase().lastIndexOf(keyword) > -1) {              list.add(tempf);            }            list.addAll(FindFile(tempf, keyword));          } else {            if (tempf.getName().toLowerCase().lastIndexOf(keyword) > -1) {              list.add(tempf);            }          }        }      }    }    return list;  }  /**   * searchFile 查找文件并加入到ArrayList 当中去   *   * @param context   * @param keyword   * @param filepath   * @return   */  public static List<Map<String, Object>> searchFile(Context context, String keyword, File filepath) {    List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();    Map<String, Object> rowItem = null;    int index = 0;    // 判断SD卡是否存在    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {      File[] files = filepath.listFiles();      if (files.length > 0) {        for (File file : files) {          if (file.isDirectory()) {            if (file.getName().toLowerCase().lastIndexOf(keyword) > -1) {              rowItem = new HashMap<String, Object>();              rowItem.put("number", index); // 加入序列号              rowItem.put("fileName", file.getName());// 加入名称              rowItem.put("path", file.getPath()); // 加入路径              rowItem.put("size", file.length() + ""); // 加入文件大小              list.add(rowItem);            }            // 如果目录可读就执行（一定要加，不然会挂掉）            if (file.canRead()) {              list.addAll(searchFile(context, keyword, file)); // 如果是目录，递归查找            }          } else {            // 判断是文件，则进行文件名判断            try {              if (file.getName().indexOf(keyword) > -1 || file.getName().indexOf(keyword.toUpperCase()) > -1) {                rowItem = new HashMap<String, Object>();                rowItem.put("number", index); // 加入序列号                rowItem.put("fileName", file.getName());// 加入名称                rowItem.put("path", file.getPath()); // 加入路径                rowItem.put("size", file.length() + ""); // 加入文件大小                list.add(rowItem);                index++;              }            } catch (Exception e) {              Toast.makeText(context, "查找发生错误!", Toast.LENGTH_SHORT).show();            }          }        }      }    }    return list;  }  /**   * 根据后缀得到文件类型   *   * @param fileName   * @param pointIndex   * @return   */  public static String getFileType(String fileName, int pointIndex) {    String type = fileName.substring(pointIndex + 1).toLowerCase();    if ("m4a".equalsIgnoreCase(type) || "xmf".equalsIgnoreCase(type) || "ogg".equalsIgnoreCase(type) || "wav".equalsIgnoreCase(type)        || "m4a".equalsIgnoreCase(type) || "aiff".equalsIgnoreCase(type) || "midi".equalsIgnoreCase(type)        || "vqf".equalsIgnoreCase(type) || "aac".equalsIgnoreCase(type) || "flac".equalsIgnoreCase(type)        || "tak".equalsIgnoreCase(type) || "wv".equalsIgnoreCase(type)) {      type = "ic_file_audio";    } else if ("mp3".equalsIgnoreCase(type) || "mid".equalsIgnoreCase(type)) {      type = "ic_file_mp3";    } else if ("avi".equalsIgnoreCase(type) || "mp4".equalsIgnoreCase(type) || "dvd".equalsIgnoreCase(type)        || "mid".equalsIgnoreCase(type) || "mov".equalsIgnoreCase(type) || "mkv".equalsIgnoreCase(type)        || "mp2v".equalsIgnoreCase(type) || "mpe".equalsIgnoreCase(type) || "mpeg".equalsIgnoreCase(type)        || "mpg".equalsIgnoreCase(type) || "asx".equalsIgnoreCase(type) || "asf".equalsIgnoreCase(type)        || "flv".equalsIgnoreCase(type) || "navi".equalsIgnoreCase(type) || "divx".equalsIgnoreCase(type)        || "rm".equalsIgnoreCase(type) || "rmvb".equalsIgnoreCase(type) || "dat".equalsIgnoreCase(type)        || "mpa".equalsIgnoreCase(type) || "vob".equalsIgnoreCase(type) || "3gp".equalsIgnoreCase(type)        || "swf".equalsIgnoreCase(type) || "wmv".equalsIgnoreCase(type)) {      type = "ic_file_video";    } else if ("bmp".equalsIgnoreCase(type) || "pcx".equalsIgnoreCase(type) || "tiff".equalsIgnoreCase(type)        || "gif".equalsIgnoreCase(type) || "jpeg".equalsIgnoreCase(type) || "tga".equalsIgnoreCase(type)        || "exif".equalsIgnoreCase(type) || "fpx".equalsIgnoreCase(type) || "psd".equalsIgnoreCase(type)        || "cdr".equalsIgnoreCase(type) || "raw".equalsIgnoreCase(type) || "eps".equalsIgnoreCase(type)        || "gif".equalsIgnoreCase(type) || "jpg".equalsIgnoreCase(type) || "jpeg".equalsIgnoreCase(type)        || "png".equalsIgnoreCase(type) || "hdri".equalsIgnoreCase(type) || "ai".equalsIgnoreCase(type)) {      type = "ic_file_image";    } else if ("ppt".equalsIgnoreCase(type) || "doc".equalsIgnoreCase(type) || "xls".equalsIgnoreCase(type)        || "pps".equalsIgnoreCase(type) || "xlsx".equalsIgnoreCase(type) || "xlsm".equalsIgnoreCase(type)        || "pptx".equalsIgnoreCase(type) || "pptm".equalsIgnoreCase(type) || "ppsx".equalsIgnoreCase(type)        || "maw".equalsIgnoreCase(type) || "mdb".equalsIgnoreCase(type) || "pot".equalsIgnoreCase(type)        || "msg".equalsIgnoreCase(type) || "oft".equalsIgnoreCase(type) || "xlw".equalsIgnoreCase(type)        || "wps".equalsIgnoreCase(type) || "rtf".equalsIgnoreCase(type) || "ppsm".equalsIgnoreCase(type)        || "potx".equalsIgnoreCase(type) || "potm".equalsIgnoreCase(type) || "ppam".equalsIgnoreCase(type)) {      type = "ic_file_office";    } else if ("txt".equalsIgnoreCase(type) || "text".equalsIgnoreCase(type) || "chm".equalsIgnoreCase(type)        || "hlp".equalsIgnoreCase(type) || "pdf".equalsIgnoreCase(type) || "doc".equalsIgnoreCase(type)        || "docx".equalsIgnoreCase(type) || "docm".equalsIgnoreCase(type) || "dotx".equalsIgnoreCase(type)) {      type = "ic_file_text";    } else if ("ini".equalsIgnoreCase(type) || "sys".equalsIgnoreCase(type) || "dll".equalsIgnoreCase(type)        || "adt".equalsIgnoreCase(type)) {      type = "ic_file_system";    } else if ("rar".equalsIgnoreCase(type) || "zip".equalsIgnoreCase(type) || "arj".equalsIgnoreCase(type)        || "gz".equalsIgnoreCase(type) || "z".equalsIgnoreCase(type) || "7Z".equalsIgnoreCase(type) || "GZ".equalsIgnoreCase(type)        || "BZ".equalsIgnoreCase(type) || "ZPAQ".equalsIgnoreCase(type)) {      type = "ic_file_rar";    } else if ("html".equalsIgnoreCase(type) || "htm".equalsIgnoreCase(type) || "java".equalsIgnoreCase(type)        || "php".equalsIgnoreCase(type) || "asp".equalsIgnoreCase(type) || "aspx".equalsIgnoreCase(type)        || "jsp".equalsIgnoreCase(type) || "shtml".equalsIgnoreCase(type) || "xml".equalsIgnoreCase(type)) {      type = "ic_file_web";    } else if ("exe".equalsIgnoreCase(type) || "com".equalsIgnoreCase(type) || "bat".equalsIgnoreCase(type)        || "iso".equalsIgnoreCase(type) || "msi".equalsIgnoreCase(type)) {      type = "ic_file_exe";    } else if ("apk".equalsIgnoreCase(type)) {      type = "ic_file_apk";    } else {      type = "ic_file_normal";    }    return type;  }  /**   * 改变文件大小显示的内容   *   * @param size   * @return   */  public static String changeFileSize(String size) {    if (Integer.parseInt(size) > 1024) {      size = Integer.parseInt(size) / 1024 + "K";    } else if (Integer.parseInt(size) > (1024 * 1024)) {      size = Integer.parseInt(size) / (1024 * 1024) + "M";    } else if (Integer.parseInt(size) > (1024 * 1024 * 1024)) {      size = Integer.parseInt(size) / (1024 * 1024 * 1024) + "G";    } else {      size += "B";    }    return size;  }  /**   * 得到所有文件   *   * @param dir   * @return   */  public static ArrayList<File> getAllFiles(File dir) {    ArrayList<File> allFiles = new ArrayList<File>();    // 递归取得目录下的所有文件及文件夹    File[] files = dir.listFiles();    for (int i = 0; i < files.length; i++) {      File file = files[i];      allFiles.add(file);      if (file.isDirectory()) {        getAllFiles(file);      }    }    Logger.i("test", allFiles.size() + "");    return allFiles;  }  /**   * 判断文件MimeType 类型   *   * @param f   * @return   */  public static String getMIMEType(File f) {    String type = "";    String fName = f.getName();    /* 取得扩展名 */    String end = fName.substring(fName.lastIndexOf(".") + 1, fName.length()).toLowerCase();    /* 依扩展名的类型决定MimeType */    if (end.equalsIgnoreCase("m4a") || end.equalsIgnoreCase("mp3") || end.equalsIgnoreCase("mid") || end.equalsIgnoreCase("xmf")        || end.equalsIgnoreCase("ogg") || end.equalsIgnoreCase("wav")) {      type = "audio";    } else if (end.equalsIgnoreCase("3gp") || end.equalsIgnoreCase("mp4")) {      type = "video";    } else if (end.equalsIgnoreCase("jpg") || end.equalsIgnoreCase("gif") || end.equalsIgnoreCase("png")        || end.equalsIgnoreCase("jpeg") || end.equalsIgnoreCase("bmp")) {      type = "image";    } else if (end.equalsIgnoreCase("apk")) {      /* android.permission.INSTALL_PACKAGES */      type = "application/vnd.android.package-archive";    } else if (end.equalsIgnoreCase("txt") || end.equalsIgnoreCase("java")) {      /* android.permission.INSTALL_PACKAGES */      type = "text";    } else {      type = "*";    }    /* 如果无法直接打开，就跳出软件列表给用户选择 */    if (end.equalsIgnoreCase("apk")) {    } else {      type += "/*";    }    return type;  }  /**   * 拷贝文件   *   * @param fromFile   * @param toFile   * @throws IOException   */  public static void copyFile(File fromFile, String toFile) throws IOException {    FileInputStream from = null;    FileOutputStream to = null;    try {      from = new FileInputStream(fromFile);      to = new FileOutputStream(toFile);      byte[] buffer = new byte[1024];      int bytesRead;      while ((bytesRead = from.read(buffer)) != -1)        to.write(buffer, 0, bytesRead); // write    } finally {      if (from != null)        try {          from.close();        } catch (IOException e) {          Log.e(TAG, "", e);        }      if (to != null)        try {          to.close();        } catch (IOException e) {          Log.e(TAG, "", e);        }    }  }  /**   * 创建文件   *   * @param file   * @return   */  public static File createNewFile(File file) {    try {      if (file.exists()) {        return file;      }      File dir = file.getParentFile();      if (!dir.exists()) {        dir.mkdirs();      }      if (!file.exists()) {        file.createNewFile();      }    } catch (IOException e) {      Log.e(TAG, "", e);      return null;    }    return file;  }  /**   * 创建文件   *   * @param path   */  public static File createNewFile(String path) {    File file = new File(path);    return createNewFile(file);  }// end method createText()  /**   * 删除文件   *   * @param path   */  public static void deleteFile(String path) {    File file = new File(path);    deleteFile(file);  }  /**   * 删除文件   *   * @param file   */  public static void deleteFile(File file) {    if (!file.exists()) {      return;    }    if (file.isFile()) {      file.delete();    } else if (file.isDirectory()) {      File files[] = file.listFiles();      for (int i = 0; i < files.length; i++) {        deleteFile(files[i]);      }    }    file.delete();  }  /**   * 向Text文件中写入内容   *   * @param file   * @param content   * @return   */  public static boolean write(String path, String content) {    return write(path, content, false);  }  public static boolean write(String path, String content, boolean append) {    return write(new File(path), content, append);  }  public static boolean write(File file, String content) {    return write(file, content, false);  }  /**   * 写入文件   *   * @param file   * @param content   * @param append   * @return   */  public static boolean write(File file, String content, boolean append) {    if (file == null || StringUtil.empty(content)) {      return false;    }    if (!file.exists()) {      file = createNewFile(file);    }    FileOutputStream fos = null;    try {      fos = new FileOutputStream(file, append);      fos.write(content.getBytes());    } catch (Exception e) {      Log.e(TAG, "", e);      return false;    } finally {      try {        fos.close();      } catch (IOException e) {        Log.e(TAG, "", e);      }      fos = null;    }    return true;  }  /**   * 获得文件名   *   * @param path   * @return   */  public static String getFileName(String path) {    if (StringUtil.empty(path)) {      return null;    }    File f = new File(path);    String name = f.getName();    f = null;    return name;  }  /**   * 读取文件内容，从第startLine行开始，读取lineCount行   *   * @param file   * @param startLine   * @param lineCount   * @return 读到文字的list,如果list.size<lineCount则说明读到文件末尾了   */  public static List<String> readFile(File file, int startLine, int lineCount) {    if (file == null || startLine < 1 || lineCount < 1) {      return null;    }    if (!file.exists()) {      return null;    }    FileReader fileReader = null;    List<String> list = null;    try {      list = new ArrayList<String>();      fileReader = new FileReader(file);      LineNumberReader lineReader = new LineNumberReader(fileReader);      boolean end = false;      for (int i = 1; i < startLine; i++) {        if (lineReader.readLine() == null) {          end = true;          break;        }      }      if (end == false) {        for (int i = startLine; i < startLine + lineCount; i++) {          String line = lineReader.readLine();          if (line == null) {            break;          }          list.add(line);        }      }    } catch (Exception e) {      Log.e(TAG, "read log error!", e);    } finally {      if (fileReader != null) {        try {          fileReader.close();        } catch (IOException e) {          e.printStackTrace();        }      }    }    return list;  }  /**   * 创建文件夹   *   * @param dir   * @return   */  public static boolean createDir(File dir) {    try {      if (!dir.exists()) {        dir.mkdirs();      }      return true;    } catch (Exception e) {      Log.e(TAG, "create dir error", e);      return false;    }  }  /**   * 在SD卡上创建目录   *   * @param dirName   */  public static File creatSDDir(String dirName) {    File dir = new File(dirName);    dir.mkdir();    return dir;  }  /**   * 判断SD卡上的文件是否存在   */  public static boolean isFileExist(String fileName) {    File file = new File(fileName);    return file.exists();  }  /**   * 将一个InputStream里面的数据写入到SD卡中   */  public static File write2SDFromInput(String path, String fileName, InputStream input) {    File file = null;    OutputStream output = null;    try {      creatSDDir(path);      file = createNewFile(path + "/" + fileName);      output = new FileOutputStream(file);      byte buffer[] = new byte[1024];      int len = -1;      while ((len = input.read(buffer)) != -1) {        output.write(buffer, 0, len);      }      output.flush();    } catch (Exception e) {      e.printStackTrace();    } finally {      try {        output.close();      } catch (Exception e) {        e.printStackTrace();      }    }    return file;  }  /**   * 读取文件内容 从文件中一行一行的读取文件   *   * @param file   * @return   */  public static String readFile(File file) {    Reader read = null;    String content = "";    String result = "";    BufferedReader br = null;    try {      read = new FileReader(file);      br = new BufferedReader(read);      while ((content = br.readLine().toString().trim()) != null) {        result += content + "/r/n";      }    } catch (Exception e) {      e.printStackTrace();    } finally {      try {        read.close();        br.close();      } catch (Exception e) {        e.printStackTrace();      }    }    return result;  }  /**   * 将图片保存到本地时进行压缩, 即将图片从Bitmap形式变为File形式时进行压缩,   * 特点是: File形式的图片确实被压缩了, 但是当你重新读取压缩后的file为 Bitmap是,它占用的内存并没有改变   *   * @param bmp   * @param file   */  public static void compressBmpToFile(Bitmap bmp, File file) {    ByteArrayOutputStream baos = new ByteArrayOutputStream();    int options = 80;// 个人喜欢从80开始,    bmp.compress(Bitmap.CompressFormat.JPEG, options, baos);    while (baos.toByteArray().length / 1024 > 100) {      baos.reset();      options -= 10;      bmp.compress(Bitmap.CompressFormat.JPEG, options, baos);    }    try {      FileOutputStream fos = new FileOutputStream(file);      fos.write(baos.toByteArray());      fos.flush();      fos.close();    } catch (Exception e) {      e.printStackTrace();    }  }  /**   * 将图片从本地读到内存时,进行压缩 ,即图片从File形式变为Bitmap形式   * 特点: 通过设置采样率, 减少图片的像素, 达到对内存中的Bitmap进行压缩   * @param srcPath   * @return   */  public static Bitmap compressImageFromFile(String srcPath, float pixWidth, float pixHeight) {    BitmapFactory.Options options = new BitmapFactory.Options();    options.inJustDecodeBounds = true;// 只读边,不读内容    Bitmap bitmap = BitmapFactory.decodeFile(srcPath, options);    options.inJustDecodeBounds = false;    int w = options.outWidth;    int h = options.outHeight;    //float pixWidth = 800f;//    //float pixHeight = 480f;//    int scale = 1;    if (w > h && w > pixWidth) {      scale = (int) (options.outWidth / pixWidth);    } else if (w < h && h > pixHeight) {      scale = (int) (options.outHeight / pixHeight);    }    if (scale <= 0)      scale = 1;    options.inSampleSize = scale;// 设置采样率    options.inPreferredConfig = Config.ARGB_8888;// 该模式是默认的,可不设    options.inPurgeable = true;// 同时设置才会有效    options.inInputShareable = true;// 。当系统内存不够时候图片自动被回收    bitmap = BitmapFactory.decodeFile(srcPath, options);    // return compressBmpFromBmp(bitmap);//原来的方法调用了这个方法企图进行二次压缩    // 其实是无效的,大家尽管尝试    return bitmap;  }  /**  *  指定分辨率和清晰度的图片压缩  */  public void transImage(String fromFile, String toFile, int width, int height, int quality)  {    try    {      Bitmap bitmap = BitmapFactory.decodeFile(fromFile);      int bitmapWidth = bitmap.getWidth();      int bitmapHeight = bitmap.getHeight();      // 缩放图片的尺寸      float scaleWidth = (float) width / bitmapWidth;      float scaleHeight = (float) height / bitmapHeight;      Matrix matrix = new Matrix();      matrix.postScale(scaleWidth, scaleHeight);      // 产生缩放后的Bitmap对象      Bitmap resizeBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmapWidth, bitmapHeight, matrix, false);      // save file      File myCaptureFile = new File(toFile);      FileOutputStream out = new FileOutputStream(myCaptureFile);      if(resizeBitmap.compress(Bitmap.CompressFormat.JPEG, quality, out)){        out.flush();        out.close();      }      if(!bitmap.isRecycled()){        bitmap.recycle();//记得释放资源，否则会内存溢出      }      if(!resizeBitmap.isRecycled()){        resizeBitmap.recycle();      }    }    catch (FileNotFoundException e)    {      e.printStackTrace();    }    catch (IOException ex)    {      ex.printStackTrace();    }  }}