文件存储 读写

package com.lisq.kuaipan.oauth;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.os.Environment;
import android.util.Log;

public class FileUtils {
	private String SDPATH; // 用于存sd card的文件的路径
	private final static String TAG = "kuaipan";

	public String getSDPATH() {
		return SDPATH;
	}

	public void setSDPATH(String sDPATH) {
		SDPATH = sDPATH;
	}

	/**
	 * 构造方法 获取SD卡路径
	 */
	public FileUtils() {
		// 获得当前外部存储设备的目录
		SDPATH = Environment.getExternalStorageDirectory() + "/";
		Log.e(TAG, "sd card's directory path:  " + SDPATH);

	}

	/**
	 * 在SD卡上创建文件
	 * 
	 * @throws IOException
	 */
	public File createSDFile(String fileName) throws IOException {
		File file = new File(SDPATH + fileName);
		file.createNewFile();
		return file;
	}

	/**
	 * 在SD卡上创建目录
	 */
	public File createSDDir(String dirName) {
		File dir = new File(SDPATH + dirName);
		Log.e(TAG,
				"storage device's state :"
						+ Environment.getExternalStorageState());

		if (Environment.getExternalStorageState().equals(
				Environment.MEDIA_MOUNTED)) {
			Log.e(TAG, "this directory real path is:" + dir.getAbsolutePath());
			Log.e(TAG, "the result of making directory:" + dir.mkdir()
					+ " it is exist? = " + dir.exists());

		}
		return dir;
	}

	/**
	 * 判断SD卡上的文件夹是否存在
	 */
	public boolean isFileExist(String fileName) {
		File file = new File(SDPATH + fileName);
		Log.e(TAG, "FileUtils isFileExist fileName= " + fileName);
		return file.exists();
	}

	/**
	 * 将一个inputSteam里面的数据写入到SD卡中
	 */
	public File write2SDFromInput(String path, String fileName,
			InputStream inputStream) {
		File file = null;
		OutputStream output = null;
		// BufferedWriter bufferedWriter;
		try {
			// 创建SD卡上的目录
			File tempf = createSDDir(path);
			Log.e(TAG,
					"FileUtils write2SDFromInput directory in the sd card: = "
							+ tempf.exists());

			file = createSDFile(path + fileName);
			Log.e(TAG, "FileUtils write2SDFromInput file in the sd card: = "
					+ file.exists());

			output = new FileOutputStream(file);
			// bufferedWriter = new BufferedWriter(new FileWriter(file));

			// byte buffer[] = new byte[20 * 1024];
//			int filesize = inputStream.available();	
//			byte buffer[] = new byte[filesize];
//			Log.e(TAG, "FileUtils write2SDFromInput  111= ");
//			int length = 0;
//			// length = inputStream.read(buffer);
//			Log.e(TAG, "FileUtils write2SDFromInput 1 length= " + length);
//			// while ((length = inputStream.read(buffer)) != -1) {
//			// Log.e(TAG, "FileUtils write2SDFromInput  length= " + length);
//			// bufferedWriter.write(buffer, 0, length);
//			// }
//			while ((inputStream.read(buffer)) != -1) {
//				output.write(buffer);
//			}
			
			byte[] buffer = new byte[1024];
			int readIndex;
			while (-1 != (readIndex = inputStream.read(buffer, 0,
					buffer.length))) {
				output.write(buffer, 0, readIndex);
			}
			
			// bufferedWriter.flush();
			inputStream.close();
			// bufferedWriter.close();
			output.flush();
		} catch (FileNotFoundException e) {
			Log.e(TAG, "FileUtils write2SDFromInput 222");
			e.printStackTrace();
		} catch (IOException e) {
			Log.e(TAG, "FileUtils write2SDFromInput 333");
			e.printStackTrace();
		} finally {
			try {
				Log.e(TAG, "FileUtils write2SDFromInput 444");
				// output.close();
				inputStream.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

		return file;
	}

}