Android--檔案存取

標籤：android   style   blog   class   code   java   

import java.io.ByteArrayOutputStream;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import org.apache.http.util.EncodingUtils;import android.app.Activity;import android.content.Context;/** * Write and read data at ./data/data/packageName/files/ *  * @author yurf */public class FileCache {    /**     * write file to ./data/data/packageName/files/     *      * @param fileName     *            filename     * @param message     *            string to save     * @param context     */    public static void writeFileData(String fileName, String message,            Context context) {        String content = message;        try {            FileOutputStream outputStream = context.openFileOutput(fileName,                    Activity.MODE_PRIVATE);            outputStream.write(content.getBytes());            outputStream.flush();            outputStream.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }    /**     * write file to ./data/data/packageName/files/     *      * @param fileName     * @param values     * @param context     */    public static void writeFileData(String fileName, byte[] values,            Context context) {        try {            FileOutputStream outputStream = context.openFileOutput(fileName,                    Activity.MODE_PRIVATE);            outputStream.write(values);            outputStream.flush();            outputStream.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }    /**     * read file from ./data/data/packageName/files/     *      * @param fileName     * @param context     * @return     */    public static String readFileData(String fileName, Context context) {        String content = "";        try {            FileInputStream inputStream = context.openFileInput(fileName);            ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();            int length = inputStream.available();            byte[] bytes = new byte[length];            inputStream.read(bytes);            arrayOutputStream.write(bytes, 0, bytes.length);            inputStream.close();            arrayOutputStream.close();            content = EncodingUtils.getString(arrayOutputStream.toByteArray(),                    "UTF-8");        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return content;    }}