Android 文件读写openFileInput、openFileOutput / SharedPreferences 存储

//保存文本
    public void saveText(String inputText){
        FileOutputStream fileOutputStream=null;
        BufferedWriter bufferedWriter=null;
        try {
            fileOutputStream = openFileOutput("data", MODE_PRIVATE);
            bufferedWriter = new BufferedWriter(new OutputStreamWriter(fileOutputStream));
            bufferedWriter.write(inputText);
        }catch (IOException e) {
            e.printStackTrace();
        }finally {
            if(bufferedWriter!=null){
                try {
                    bufferedWriter.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

//读取文本
    public String loadText(){
        FileInputStream fileInputStream=null;
        BufferedReader bufferedReader=null;
        StringBuilder content=new StringBuilder();
        try {
            fileInputStream=openFileInput("data");
            bufferedReader=new BufferedReader(new InputStreamReader(fileInputStream));
            String line="";
            while ((line=bufferedReader.readLine())!=null){
                content.append(line);
            }
        } catch (IOException e) {
                e.printStackTrace();
        } finally {
            if(fileInputStream!=null){
                try {
                    fileInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return content.toString();
    }

//SharedPreferences 存储

        SharedPreferences.Editor editor=getSharedPreferences("data",MODE_PRIVATE).edit();
        editor.putString("user","账号aaaaa");
        editor.putString("password","密码yyyyyy");
        editor.apply();

        SharedPreferences pref=getSharedPreferences("data",MODE_PRIVATE);
        String a = pref.getString("user","");
        String b = pref.getString("password","");
        Log.d(TAG, "onCreate: " + a + "----" + b);