Android下寫入數據到文件和從文件讀取數據

定義了一個類，saveToRom函數將指定的數據寫入tel.txt文件，loadFromRom從tel.txt文件讀取數據

import android.content.Context;

import java.io.FileInputStream;
import java.io.FileOutputStream;
/**

Created by test on 2014/9/12.
*/
public class SaveDataService {
//定義應用程序的上下文
 private Context context;
//構造函數
 public SaveDataService(Context context){

 this.setContext(context);

}
private void setContext(Context context){

 this.context = context;

}
/
 寫入文件到rom
  /
 public void saveToRom(String tel,String content){

 try {
     FileOutputStream fos =  context.openFileOutput("tel.txt", Context.MODE_PRIVATE);
     String data = tel +":" + content;
     fos.write(data.getBytes());
     fos.flush();
     fos.close();
 }
 catch(Exception e)
 {
     e.printStackTrace();
 }

}
public String loadFromRom(){

 String result = "";
 try {
     StringBuffer sb = new StringBuffer();
     FileInputStream fis =  context.openFileInput("tel.txt");
     int ch;
     while((ch=fis.read()) !=-1) {
         sb.append((char)ch);
     }
     fis.close();
     result = sb.toString();
 }
 catch(Exception e)
 {
     e.printStackTrace();
 }
 return result;

}
}</pre>