文件缓存（配合JSON数组）

 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 list)
  {
    if(!filefolder.exists())
      filefolder.mkdirs();
    try
    {
      JSONArray array=new JSONArray();
      for(int i=0;i readCache() throws JSONException,IOException
  {
    if(!filefolder.exists())
      filefolder.mkdir();
    List list=new ArrayList();
    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