Android文件操作工具类详解

 package com.ctgu.filemaster.utils; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.text.DecimalFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Collections; import java.util.Date; import java.util.List; import java.util.Locale; import android.os.Environment; import android.util.Log; public class FileUtil { private static final String[][] MIME_MapTable = { // {后缀名， MIME类型} { ".3gp", "video/3gpp" }, { ".apk", "application/vnd.android.package-archive" }, { ".asf", "video/x-ms-asf" }, { ".avi", "video/x-msvideo" }, { ".bin", "application/octet-stream" }, { ".bmp", "image/bmp" }, { ".c", "text/plain" }, { ".class", "application/octet-stream" }, { ".conf", "text/plain" }, { ".cpp", "text/plain" }, { ".doc", "application/msword" }, { ".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document" }, { ".xls", "application/vnd.ms-excel" }, { ".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" }, { ".exe", "application/octet-stream" }, { ".gif", "image/gif" }, { ".gtar", "application/x-gtar" }, { ".gz", "application/x-gzip" }, { ".h", "text/plain" }, { ".htm", "text/html" }, { ".html", "text/html" }, { ".jar", "application/java-archive" }, { ".java", "text/plain" }, { ".jpeg", "image/jpeg" }, { ".jpg-600", "image/jpeg" }, { ".js", "application/x-javascript" }, { ".log", "text/plain" }, { ".m3u", "audio/x-mpegurl" }, { ".m4a", "audio/mp4a-latm" }, { ".m4b", "audio/mp4a-latm" }, { ".m4p", "audio/mp4a-latm" }, { ".m4u", "video/vnd.mpegurl" }, { ".m4v", "video/x-m4v" }, { ".mov", "video/quicktime" }, { ".mp2", "audio/x-mpeg" }, { ".mp3", "audio/x-mpeg" }, { ".mp4", "video/mp4" }, { ".mpc", "application/vnd.mpohun.certificate" }, { ".mpe", "video/mpeg" }, { ".mpeg", "video/mpeg" }, { ".mpg", "video/mpeg" }, { ".mpg4", "video/mp4" }, { ".mpga", "audio/mpeg" }, { ".msg", "application/vnd.ms-outlook" }, { ".ogg", "audio/ogg" }, { ".pdf", "application/pdf" }, { ".png-600", "image/png" }, { ".pps", "application/vnd.ms-powerpoint" }, { ".ppt", "application/vnd.ms-powerpoint" }, { ".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation" }, { ".prop", "text/plain" }, { ".rc", "text/plain" }, { ".rmvb", "audio/x-pn-realaudio" }, { ".rtf", "application/rtf" }, { ".sh", "text/plain" }, { ".tar", "application/x-tar" }, { ".tgz", "application/x-compressed" }, { ".txt", "text/plain" }, { ".wav", "audio/x-wav" }, { ".wma", "audio/x-ms-wma" }, { ".wmv", "audio/x-ms-wmv" }, { ".wps", "application/vnd.ms-works" }, { ".xml", "text/plain" }, { ".z", "application/x-compress" }, { ".zip", "application/x-zip-compressed" }, { "", "*/*" } }; /** * 根据文件后缀名获得对应的MIME类型 * * @param file *      文件对象 */ public static String getMIMEType(File file) { String type = "*/*"; String fileName = file.getName(); int dotIndex = fileName.lastIndexOf("."); // 获取后缀名前的分隔符"."在fileName中的位置 if (dotIndex <0) { return type; } String end = fileName.substring(dotIndex, fileName.length()).toLowerCase(Locale.getDefault()); // 获取文件的后缀名 if (end.length() == 0) { return type; } // 在MIME和文件类型的匹配表中找到对应的MIME类型 for (int i = 0; i  *      则path为/java/test，fileName为1.txt * @param fileName *      文件名 * @return 文件新建成功则返回true */ public static boolean createFile(String path, String fileName) { File file = new File(path + File.separator + fileName); if (file.exists()) { Log.w(Util.TAG, "新建文件失败：file.exist()=" + file.exists()); return false; } else { try { boolean isCreated = file.createNewFile(); return isCreated; } catch (IOException e) { e.printStackTrace(); } } return false; } /** * 删除单个文件 * * @param file *      要删除的文件对象 * @return 文件删除成功则返回true */ public static boolean deleteFile(File file) { if (file.exists()) { boolean isDeleted = file.delete(); Log.w(Util.TAG, file.getName() + "删除结果：" + isDeleted); return isDeleted; } else { Log.w(Util.TAG, "文件删除失败：文件不存在！"); return false; } } /** * 删除单个文件 * * @param path *      文件所在路径名 * @param fileName *      文件名 * @return 删除成功则返回true */ public static boolean deleteFile(String path, String fileName) { File file = new File(path + File.separator + fileName); if (file.exists()) { boolean isDeleted = file.delete(); return isDeleted; } else { return false; } } /** * 复制文件 * * @param srcPath *      源文件绝对路径 * @param destDir *      目标文件所在目录 * @return boolean */ public static boolean copyFile(String srcPath, String destDir) { boolean flag = false; File srcFile = new File(srcPath); // 源文件 if (!srcFile.exists()) { // 源文件不存在 Util.toast("源文件不存在"); return false; } // 获取待复制文件的文件名 String fileName = srcPath.substring(srcPath.lastIndexOf(File.separator)); String destPath = destDir + fileName; if (destPath.equals(srcPath)) { // 源文件路径和目标文件路径重复 Util.toast("源文件路径和目标文件路径重复!"); return false; } File destFile = new File(destPath); // 目标文件 if (destFile.exists() && destFile.isFile()) { // 该路径下已经有一个同名文件 Util.toast("目标目录下已有同名文件!"); return false; } File destFileDir = new File(destDir); destFileDir.mkdirs(); try { FileInputStream fis = new FileInputStream(srcPath); FileOutputStream fos = new FileOutputStream(destFile); byte[] buf = new byte[1024]; int c; while ((c = fis.read(buf)) != -1) { fos.write(buf, 0, c); } fis.close(); fos.close(); flag = true; } catch (IOException e) { e.printStackTrace(); } if (flag) { Util.toast("复制文件成功!"); } return flag; } /** * 根据文件名获得文件的扩展名 * * @param fileName *      文件名 * @return 文件扩展名（不带点） */ public static String getFileSuffix(String fileName) { int index = fileName.lastIndexOf("."); String suffix = fileName.substring(index + 1, fileName.length()); return suffix; } /** * 重命名文件 * * @param oldPath *      旧文件的绝对路径 * @param newPath *      新文件的绝对路径 * @return 文件重命名成功则返回true */ public static boolean renameTo(String oldPath, String newPath) { if (oldPath.equals(newPath)) { Log.w(Util.TAG, "文件重命名失败：新旧文件名绝对路径相同！"); return false; } File oldFile = new File(oldPath); File newFile = new File(newPath); boolean isSuccess = oldFile.renameTo(newFile); Log.w(Util.TAG, "文件重命名是否成功：" + isSuccess); return isSuccess; } /** * 重命名文件 * * @param oldFile *      旧文件对象 * @param newFile *      新文件对象 * @return 文件重命名成功则返回true */ public static boolean renameTo(File oldFile, File newFile) { if (oldFile.equals(newFile)) { Log.w(Util.TAG, "文件重命名失败：旧文件对象和新文件对象相同！"); return false; } boolean isSuccess = oldFile.renameTo(newFile); Log.w(Util.TAG, "文件重命名是否成功：" + isSuccess); return isSuccess; } /** * 重命名文件 * * @param oldFile *      旧文件对象，File类型 * @param newName *      新文件的文件名，String类型 * @return 重命名成功则返回true */ public static boolean renameTo(File oldFile, String newName) { File newFile = new File(oldFile.getParentFile() + File.separator + newName); boolean flag = oldFile.renameTo(newFile); System.out.println(flag); return flag; } /** * 计算某个文件的大小 * * @param file *      文件对象 * @return 文件大小，如果file不是文件，则返回-1 */ public static long getFileSize(File file) { if (file.isFile()) { return file.length(); } else { return -1; } } /** * 计算某个文件的大小 * * @param path *      文件的绝对路径 * @return */ public static long getFileSize(String path) { File file = new File(path); long size = file.length(); return size; } /** * 文件大小的格式化 * * @param size *      文件大小，单位为byte * @return 文件大小格式化后的文本 */ public static String formatSize(long size) { DecimalFormat df = new DecimalFormat("####.00"); if (size <1024) // 小于1KB { return size + "Byte"; } else if (size <1024 * 1024)> getSDCardFileList(boolean showHidden) { List list = new ArrayList<>(); File files[]; if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { File extDir = Environment.getExternalStorageDirectory(); files = extDir.listFiles(); for (File file : files) { list.add(file); } if (showHidden) { // } else { for (int i = 0; i = 0) // 目录下存在文件列表 { for (int i = 0; i = 0) { long size = 0; for (File f : files) { if (f.isFile()) { // 获得子文件的大小 size = size + getFileSize(f); } else { // 获得子目录的大小 size = size + getFolderSize(f); } } return size; } return -1; } /** * 获得某个文件或目录的大小 * * @param file * @return */ public static long getFileOrFolderSize(File file) { long size = 0; if (file.isDirectory()) { size = getFolderSize(file); } else { size = getFileSize(file); } return size; } }