public class FileUtil { /** * 删除文件 * * @param context * 程序上下文 * @param fileName * 文件名,要在系统内保持唯一 * @return boolean 存储成功的标志 */ public static boolean deleteFile(Context context, String fileName) { return context.deleteFile(fileName); } /** * 文件是否存在 * * @param context * @param fileName * @return */ public static boolean exists(Context context, String fileName) { return new File(context.getFilesDir(), fileName).exists(); } /** * 存储文本数据 * * @param context * 程序上下文 * @param fileName * 文件名,要在系统内保持唯一 * @param content * 文本内容 * @return boolean 存储成功的标志 */ public static boolean writeFile(Context context, String fileName, String content) { boolean success = false; FileOutputStream fos = null; try { fos = context.openFileOutput(fileName, Context.MODE_PRIVATE); byte[] byteContent = content.getBytes(); fos.write(byteContent); success = true; } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { if (fos != null) fos.close(); } catch (IOException ioe) { ioe.printStackTrace(); } } return success; } /** * 存储文本数据 * * @param context * 程序上下文 * @param fileName * 文件名,要在系统内保持唯一 * @param content * 文本内容 * @return boolean 存储成功的标志 */ public static boolean writeFile(String filePath, String content) { boolean success = false; FileOutputStream fos = null; try { fos = new FileOutputStream(filePath); byte[] byteContent = content.getBytes(); fos.write(byteContent); success = true; } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { if (fos != null) fos.close(); } catch (IOException ioe) { ioe.printStackTrace(); } } return success; } /** * 文件 * * @param srcFile * @param dstFile */ public static void copy(File srcFile, File dstFile) { try { FileInputStream fis = new FileInputStream(srcFile); FileOutputStream fos = new FileOutputStream(dstFile); byte[] buffer = new byte[1024]; int length = 0; while ((length = fis.read(buffer)) != -1) { fos.write(buffer, 0, length); } fis.close(); fos.close(); } catch (Exception e) { e.printStackTrace(); } } /** * 读取文本数据 * * @param context * 程序上下文 * @param fileName * 文件名 * @return String, 读取到的文本内容,失败返回null */ public static String readFile(Context context, String fileName) { if (!exists(context, fileName)) { return null; } FileInputStream fis = null; String content = null; try { fis = context.openFileInput(fileName); if (fis != null) { byte[] buffer = new byte[1024]; ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream(); while (true) { int readLength = fis.read(buffer); if (readLength == -1) break; arrayOutputStream.write(buffer, 0, readLength); } fis.close(); arrayOutputStream.close(); content = new String(arrayOutputStream.toByteArray()); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); content = null; } finally { try { if (fis != null) fis.close(); } catch (IOException ioe) { ioe.printStackTrace(); } } return content; } /** * 读取文本数据 * * @param context * 程序上下文 * @param fileName * 文件名 * @return String, 读取到的文本内容,失败返回null */ public static String readFile(String filePath) { if (filePath == null || !new File(filePath).exists()) { return null; } FileInputStream fis = null; String content = null; try { fis = new FileInputStream(filePath); if (fis != null) { byte[] buffer = new byte[1024]; ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream(); while (true) { int readLength = fis.read(buffer); if (readLength == -1) break; arrayOutputStream.write(buffer, 0, readLength); } fis.close(); arrayOutputStream.close(); content = new String(arrayOutputStream.toByteArray()); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); content = null; } finally { try { if (fis != null) fis.close(); } catch (IOException ioe) { ioe.printStackTrace(); } } return content; } /** * 读取文本数据 * * @param context * 程序上下文 * @param fileName * 文件名 * @return String, 读取到的文本内容,失败返回null */ public static String readAssets(Context context, String fileName) { InputStream is = null; String content = null; try { is = context.getAssets().open(fileName); if (is != null) { byte[] buffer = new byte[1024]; ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream(); while (true) { int readLength = is.read(buffer); if (readLength == -1) break; arrayOutputStream.write(buffer, 0, readLength); } is.close(); arrayOutputStream.close(); content = new String(arrayOutputStream.toByteArray()); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); content = null; } finally { try { if (is != null) is.close(); } catch (IOException ioe) { ioe.printStackTrace(); } } return content; } /** * 存储List对象 * * @param context * 程序上下文 * @param fileName * 文件名,要在系统内保持唯一 * @param list * 对象数组集合,对象必须实现Parcelable * @return boolean 存储成功的标志 */ public static boolean writeParcelableList(Context context, String fileName, List<Parcelable> list) { boolean success = false; FileOutputStream fos = null; try { if (list instanceof List) { fos = context.openFileOutput(fileName, Context.MODE_PRIVATE); Parcel parcel = Parcel.obtain(); parcel.writeList(list); byte[] data = parcel.marshall(); fos.write(data); success = true; } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (fos != null) { try { fos.close(); } catch (IOException ioe) { ioe.printStackTrace(); } } } return success; } /** * 读取数据对象 * * @param context * 程序上下文 * @param fileName * 文件名 * @return List, 读取到的对象数组,失败返回null */ @SuppressWarnings("unchecked") public static List<Parcelable> readParcelableList(Context context, String fileName, ClassLoader classLoader) { List<Parcelable> results = null; FileInputStream fis = null; ByteArrayOutputStream bos = null; try { fis = context.openFileInput(fileName); if (fis != null) { bos = new ByteArrayOutputStream(); byte[] b = new byte[4096]; int bytesRead; while ((bytesRead = fis.read(b)) != -1) { bos.write(b, 0, bytesRead); } byte[] data = bos.toByteArray(); Parcel parcel = Parcel.obtain(); parcel.unmarshall(data, 0, data.length); parcel.setDataPosition(0); results = parcel.readArrayList(classLoader); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); results = null; } finally { if (fis != null) try { fis.close(); } catch (IOException e) { e.printStackTrace(); } if (bos != null) try { bos.close(); } catch (IOException e) { e.printStackTrace(); } } return results; } public static boolean saveSerializable(Context context, String fileName, Serializable data) { boolean success = false; ObjectOutputStream oos = null; try { oos = new ObjectOutputStream(context.openFileOutput(fileName, Context.MODE_PRIVATE)); oos.writeObject(data); success = true; } catch (Exception e) { e.printStackTrace(); } finally { if (oos != null) { try { oos.close(); } catch (IOException e) { e.printStackTrace(); } } } return success; } public static Serializable readSerialLizable(Context context, String fileName) { Serializable data = null; ObjectInputStream ois = null; try { ois = new ObjectInputStream(context.openFileInput(fileName)); data = (Serializable) ois.readObject(); } catch (Exception e) { e.printStackTrace(); } finally { if (ois != null) { try { ois.close(); } catch (IOException e) { e.printStackTrace(); } } } return data; } /** * 从assets里边读取字符串 * * @param context * @param fileName * @return */ public static String getFromAssets(Context context, String fileName) { try { InputStreamReader inputReader = new InputStreamReader(context .getResources().getAssets().open(fileName)); BufferedReader bufReader = new BufferedReader(inputReader); String line = ""; String Result = ""; while ((line = bufReader.readLine()) != null) Result += line; return Result; } catch (Exception e) { e.printStackTrace(); } return null; } /** * 复制文件 * * @param srcFile * @param dstFile * @return */ public static boolean copy(String srcFile, String dstFile) { FileInputStream fis = null; FileOutputStream fos = null; try { File dst = new File(dstFile); if (!dst.getParentFile().exists()) { dst.getParentFile().mkdirs(); } fis = new FileInputStream(srcFile); fos = new FileOutputStream(dstFile); byte[] buffer = new byte[1024]; int len = 0; while ((len = fis.read(buffer)) != -1) { fos.write(buffer, 0, len); } } catch (Exception e) { e.printStackTrace(); return false; } finally { if (fis != null) { try { fis.close(); } catch (IOException e) { e.printStackTrace(); } } if (fos != null) { try { fos.close(); } catch (IOException e) { e.printStackTrace(); } } } return true; } }