轉載網址：http://blog.csdn.net/wirelessqa/article/details/7807762

package com.wirelessqa.helper;

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 extends Activity {


/**
* 一、私有資料夾下的檔案存取（/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();
}
}


/**
* //讀檔案在./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;
}


/**
* 寫， 讀sdcard目錄上的檔案，要用FileOutputStream， 不能用openFileOutput
* 不同點：openFileOutput是在raw裡編譯過的，FileOutputStream是任何檔案都可以
* @param fileName
* @param message
*/
// 寫在/mnt/sdcard/目錄下面的檔案
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();


}


}


// 讀在/mnt/sdcard/目錄下面的檔案


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、從resource中的raw資料夾中獲取檔案並讀取資料（資原始檔只能讀不能寫）
* 
* @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、從asset中獲取檔案並讀取資料（資原始檔只能讀不能寫）
* 
* @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;
}






}