文件工具类_JAVA_编程开发_程序员俱乐部

class="java">

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;
	}

}