檔案快取（配合JSON數組），緩衝配合json數組

檔案快取（配合JSON數組），緩衝配合json數組

1.   寫入緩衝：建立檔案夾，把list集合裡面的數群組轉換為JSON數組，存入檔案夾
2.   讀取緩衝：把JSON數組從檔案夾裡面讀取出來，然後放入list集合，返回list集合

    private final static File filefolder=new File("/sdcard/myData");
    private final static File filename=new File("/sdcard/myData/tem.txt");        public static boolean writeCache(List<Data> list)    {        if(!filefolder.exists())            filefolder.mkdirs();        try        {            JSONArray array=new JSONArray();            for(int i=0;i<list.size();i++)            {                Data data=list.get(i);                JSONObject ob=new JSONObject();                ob.put("name", data.getName());                ob.put("reason", data.getReason());                                array.put(ob);            }                        FileWriter fw=new FileWriter(filename);            fw.write(array.toString());            fw.close();        }        catch(Exception e)        {            e.printStackTrace();            return false;        }        return true;    }        public static List<Data> readCache() throws JSONException,IOException    {        if(!filefolder.exists())            filefolder.mkdir();                List<Data> list=new ArrayList<Data>();                if(filename.exists())        {            FileInputStream in=new FileInputStream(filename);            String line=null;            StringBuffer sb=new StringBuffer("");            BufferedReader br=new BufferedReader(new InputStreamReader(in));                        while((line=br.readLine())!=null)                sb.append(line);            br.close();            in.close();                        JSONArray array=new JSONArray(sb.toString());            for(int i=0;i<array.length();i++)            {                JSONObject ob=new JSONObject();                ob=array.getJSONObject(i);                Data data=new Data();                data.setName(ob.getString("name"));                data.setReason(ob.getString("reason"));                                               list.add(data);            }        }        return list;            }