android txt文件读写（读取资源文件，读取私有和SD文件的方法）

import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import org.apache.http.util.EncodingUtils; import android.app.Activity;  public class FileAccess {      /**     * 一、私有文件夹下的文件存取（/data/data/包名/files）     *      * @param fileName     * @param message     */     public void writeFileData(String fileName, String message) {         try {             FileOutputStream fout = openFileOutput(fileName, MODE_PRIVATE);             byte[] bytes = message.getBytes();             fout.write(bytes);             fout.close();         } catch (Exception e) {             e.printStackTrace();         }     }      /**     * //读文件在./data/data/包名/files/下面     *      * @param fileName     * @return     */     public String readFileData(String fileName) {         String res = "";         try {             FileInputStream fin = openFileInput(fileName);             int length = fin.available();             byte[] buffer = new byte[length];             fin.read(buffer);             res = EncodingUtils.getString(buffer, "UTF-8");             fin.close();         } catch (Exception e) {             e.printStackTrace();         }         return res;     }      /**     * 写， 读sdcard目录上的文件，要用FileOutputStream， 不能用openFileOutput     * 不同点：openFileOutput是在raw里编译过的，FileOutputStream是任何文件都可以     * @param fileName     * @param message     */     // 写在/mnt/sdcard/目录下面的文件     public void writeFileSdcard(String fileName, String message) {         try {             // FileOutputStream fout = openFileOutput(fileName, MODE_PRIVATE);             FileOutputStream fout = new FileOutputStream(fileName);             byte[] bytes = message.getBytes();             fout.write(bytes);             fout.close();         }         catch (Exception e) {             e.printStackTrace();         }     }     // 读在/mnt/sdcard/目录下面的文件     public String readFileSdcard(String fileName) {         String res = "";         try {             FileInputStream fin = new FileInputStream(fileName);             int length = fin.available();             byte[] buffer = new byte[length];             fin.read(buffer);             res = EncodingUtils.getString(buffer, "UTF-8");             fin.close();         }         catch (Exception e) {             e.printStackTrace();         }         return res;     }      /**     * 二、从resource中的raw文件夹中获取文件并读取数据（资源文件只能读不能写）     *      * @param fileInRaw     * @return     */     public String readFromRaw(int fileInRaw) {         String res = "";         try {             InputStream in = getResources().openRawResource(fileInRaw);             int length = in.available();             byte[] buffer = new byte[length];             in.read(buffer);             res = EncodingUtils.getString(buffer, "GBK");             // res = new String(buffer,"GBK");             in.close();         } catch (Exception e) {             e.printStackTrace();         }         return res;     }      /**     * 三、从asset中获取文件并读取数据（资源文件只能读不能写）     *      * @param fileName     * @return     */     public String readFromAsset(String fileName) {         String res = "";         try {             InputStream in = getResources().getAssets().open(fileName);             int length = in.available();             byte[] buffer = new byte[length];             in.read(buffer);             res = EncodingUtils.getString(buffer, "UTF-8");         } catch (Exception e) {             e.printStackTrace();         }         return res;     }    }
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