GSON:END_OBJECT从来没有被召唤过

Question

我有一个像这样的JSON：

{"aData"：

{"锦标赛"：

{"新"：[

{"token"："1-token"， "prio"："6"， "status"："inactive"， ...， "_timeCreated"："2014-04-14 14：44：

49"， "_timeChanged"："2014-08-08 12：30：20"}，

{"token"："

2-token"，"prio"："8"，"status"："inactive",...}

] }

}

}

JSON 文件大小为 8 MB，并且有效，因为它可以使用默认new JSONObject(str)或在Volley's JsonObjectRequest内解析。

我使用的代码：

 reader = new JsonReader( new InputStreamReader( am.open( "updatedata.json" ) ) );
 reader.setLenient( true );
 while( reader.hasNext() ){
   eachToken( reader );
   Log.i( TAG, "has next " + reader.hasNext() );
 }
private boolean eachToken( JsonReader reader ) throws IOException {
  JsonToken token = reader.peek();
  switch( token ){
    case BEGIN_ARRAY:
      reader.beginArray();
      Log.i( TAG, "array <<" );
      break;
    case END_ARRAY:
      reader.endArray();
      Log.i( TAG, "array >>" );
      break;
    case BEGIN_OBJECT:
      reader.beginObject();
      Log.i( TAG, "{" );
      break;
    case END_OBJECT:
      reader.endObject();
      Log.i( TAG, "}" );
      break;
    case NAME:
      String name = reader.nextName();
      Log.i( TAG, name );
      break;
    case STRING:
      String s = reader.nextString();
      Log.i( TAG, s );
      break;
    case NUMBER:
      int n = reader.nextInt();
      Log.i( TAG, "" + n );
      break;
    case BOOLEAN:
      boolean b = reader.nextBoolean();
      Log.i( TAG, "" + b );
      break;
    case NULL:
      reader.nextNull();
      Log.i( TAG, "null" );
      break;
    case END_DOCUMENT:
      Log.i( TAG, "end doc" );
      return false;
    default:
      Log.i( TAG, token.toString() );
  }
  return true;
}

问题是，从未达到END_OBJECT的情况。它将以下内容打印到logcat中：

  01-06 13:30:32.817: I/DataService(1819): {
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.817: I/DataService(1819): aData
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.817: I/DataService(1819): {
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.817: I/DataService(1819): tournaments
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.817: I/DataService(1819): {
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.817: I/DataService(1819): new
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.817: I/DataService(1819): array <<
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.817: I/DataService(1819): {
  01-06 13:30:32.817: I/DataService(1819): has next true
  01-06 13:30:32.827: I/DataService(1819): token
  01-06 13:30:32.827: I/DataService(1819): has next true
  01-06 13:30:32.827: I/DataService(1819): 1-token
  01-06 13:30:32.827: I/DataService(1819): has next true
  01-06 13:30:32.827: I/DataService(1819): prio
  01-06 13:30:32.827: I/DataService(1819): has next true
  01-06 13:30:32.827: I/DataService(1819): 6
  01-06 13:30:32.827: I/DataService(1819): has next true
  01-06 13:30:32.827: I/DataService(1819): status
  01-06 13:30:32.827: I/DataService(1819): has next true
  01-06 13:30:32.827: I/DataService(1819): inactive
  01-06 13:30:32.837: I/DataService(1819): has next true
  01-06 13:30:32.837: I/DataService(1819): _timeCreated
  01-06 13:30:32.837: I/DataService(1819): has next true
  01-06 13:30:32.837: I/DataService(1819): 2014-04-14 14:44:49
  01-06 13:30:32.837: I/DataService(1819): has next true
  01-06 13:30:32.837: I/DataService(1819): _timeChanged
  01-06 13:30:32.837: I/DataService(1819): has next true
  01-06 13:30:32.837: I/DataService(1819): 2014-08-08 12:30:20
  01-06 13:30:32.837: I/DataService(1819): has next false

因此，它到达第一个对象的"_timeChanged":"2014-08-08 12:30:20"，然后reader.hasNext() false而不是移动到新的BEGIN_OBJECT令牌。

我错过了什么？蒂亚

Answer 1

hasNext()说"如果当前数组或对象有另一个元素，则返回 true"。在您的情况下，当它命中对象或数组的末尾时，hasNext() false，因此case END_ARRAY和case END_OBJECT不会被调用。

这可能有效：

while( reader.hasNext() 
        || reader.peek() == END_ARRAY 
        || reader.peek() == END_OBJECT ){
    eachToken( reader );
    Log.i( TAG, "has next " + reader.hasNext() );
}

这与乔伊的回答基本相同，但不适合评论。

Answer 2

我想问题可能在于您处理数据的方式

如果你看JavaDoc JsonReader它特别定义了你需要使用数组括号。

在数组处理方法中，首先调用 beginArray（） 以使用数组的左括号。然后创建一个累积值的 while 循环，当 hasNext（） 为 false 时终止。最后，通过调用 endArray（） 读取数组的右括号。

所以数组完成后hasNext()是假的......