Java 将TXT文件信息解析为整数

即使有成百上千的解析问题，我也找不到任何相关的问题：

类似于一个好的旧网站计数器，我喜欢在sd卡上的txt文件中存储一个数字。每次在应用程序中激活一个方法时，它都应该读取一个txt文件的编号，添加1并再次保存

如果我尝试下面的代码，它会创建一个奇怪的字符串，没有Int。如何解决这个问题-

FileWriter writer;
File file;
FileInputStream fileIS;  

public void implementCounter()
{
    File sdcard = Environment.getExternalStorageDirectory();
    int counter = 0;

    try{

           File f = new File(sdcard +"/Experiment/Counter.txt");             
           fileIS = new FileInputStream(f);          
           BufferedReader buf = new BufferedReader(new InputStreamReader(fileIS));                               
           //counter = Integer.parseInt(buf.readLine());
           String readString = new String();             

           //just reading each line and pass it on the debugger          
           /*while((readString = buf.readLine())!= null){            
              Log.d("line: ", readString);           
           }*/
           readString = buf.readLine();
           try {
                counter = Integer.parseInt(readString.toString());
            } catch(NumberFormatException nfe) {
               Log.d("line: ", "XXX: " + readString + "E");
            } 


        } catch (FileNotFoundException e) {          
           e.printStackTrace();          
        } catch (IOException e){             
           e.printStackTrace();          
        }


    //Create / Write LogFile
    file = new File(sdcard + "/Experiment/Counter.txt");

    try 
    {
        counter++;
        writer = new FileWriter(file ,false);
        writer.write(counter);         
        writer.flush();
        writer.close();
    } 
    catch (IOException e) 
    {
        e.printStackTrace();
    }
}

---

其思想是，新的FileWriter只需用一个更高的数字覆盖旧文件。

这两个函数是静态的。您可以使用它们检索您的计数并将其保存并设置。有关更多信息，请尝试了解。欢迎各位：

    private static boolean setMyLovelyCount(Context mContext, int value) {
        SharedPreferences prefs = mContext.getSharedPreferences(
                "mylovelyprefs", 0);
        SharedPreferences.Editor editor = prefs.edit();
        editor.putInt("mylovelyCount", value);
        return editor.commit();
    }

    private static int getMyLovelyCount(Context mContext, int defaultvalue) {
        SharedPreferences prefs = mContext.getSharedPreferences(
                "mylovelyprefs", 0);
        return prefs.getInt("mylovelyCount", defaultvalue);
    }

---

为什么要将其保存在文件中？你可以这样保存它，即使应用程序被更新，它也会持续存在吗？！哈哈，我就快到了：-谢谢你！！