java - 将对象附加到android中的现有文件

Question

我已将一个对象附加到现有文件，但我无法读取它，我可以读取第一个对象，这是我的代码有什么问题吗？？

try{

       FileOutputStream fos = openFileOutput("f.txt",MODE_PRIVATE | MODE_APPEND );

       ObjectOutputStream oos = new ObjectOutputStream(fos);
       String a=new String ("Hello  object1 ");
       String b=new String("Hello  object2 ");
       String c=new String("Hello  object3 ");

       oos.writeObject(a);
       oos.writeObject(b);
       oos.writeObject(c);
       oos.close();

       // Reading it back..

       FileInputStream fis = openFileInput("f.txt");

       ObjectInputStream ois = new ObjectInputStream(fis);

       //ois=new ObjectInputStream(fis);
       //  r=(String)ois.readObject(); 
              String r;
       while ((r= (String)ois.readObject()) != null) {
          Log.i("while Read r",r);

          Toast.makeText(getApplicationContext(),r, Toast.LENGTH_SHORT).show();
       }

       ois.close();

       }catch (Exception e){
           Log.i("Exception",e.getMessage());
       }

希望你能帮帮我!!谢谢。

Answer 1

代码似乎是正确的，只是在“While”中做了一些修改，检查如下:

try{

   FileOutputStream fos = openFileOutput("f.txt",MODE_PRIVATE | MODE_APPEND );

   ObjectOutputStream oos = new ObjectOutputStream(fos);
   String a=new String ("Hello  object1 ");
   String b=new String("Hello  object2 ");
   String c=new String("Hello  object3 ");

   oos.writeObject(a);
   oos.writeObject(b);
   oos.writeObject(c);
   oos.close();

   // Reading it back..

   FileInputStream fis = openFileInput("f.txt");

   ObjectInputStream ois = new ObjectInputStream(fis);

   //ois=new ObjectInputStream(fis);
   //  r=(String)ois.readObject(); 
          String r;
   while (fis.available() > 0) {
      r= (String)ois.readObject();
      Log.i("while Read r",r);

      Toast.makeText(getApplicationContext(),r, Toast.LENGTH_SHORT).show();
   }

   ois.close();

   }catch (Exception e){
       Log.i("Exception",e.getMessage());
   }