JSONArray文本必须以'['at 1 [character 2 line 1]开头

我有一个JSON文件，我正在尝试处理，但出现以下错误：

I have a JSON file and i am trying to deal with but the following error is appears:

线程main中的异常org.json.JSONException：JSONObject文本必须以'{'位于1 [字符2第1行]
开头，位于org.json.JSONTokener.syntaxError（JSONTokener.java:433）
at org.json .JSONObject。（JSONObject.java:195）
at org.json.JSONObject。（JSONObject.java:319）
at amazondataset.AmazonDataset.main（AmazonDataset.java:11）​​
Java结果：1

Exception in thread "main" org.json.JSONException: A JSONObject text must begin with '{' at 1 [character 2 line 1] at org.json.JSONTokener.syntaxError(JSONTokener.java:433) at org.json.JSONObject.(JSONObject.java:195) at org.json.JSONObject.(JSONObject.java:319) at amazondataset.AmazonDataset.main(AmazonDataset.java:11) Java Result: 1

这是该文件的一个示例：

This is a sample of the file:

{ "reviewerID": "A2SUAM1J3GNN3B", 
  "asin": "0000013714", 
  "reviewerName": "J. McDonald", 
  "helpful": [2, 3], 
  "reviewText": "I bought this for my husband who plays the piano. He is having a wonderful time playing these old hymns. The music is at times hard to read because we think the book was published for singing from more than playing from. Great purchase though!", 
  "overall": 5.0, 
  "summary": "Heavenly Highway Hymns", 
  "unixReviewTime": 1252800000, 
  "reviewTime": "09 13, 2009" 
}

这是我的代码，只是：

JSONObject ar = new JSONObject("E:\\amazonDS.json");

    for (int i = 0; i < ar.length(); i++) {
       System.out.println( "Name: " + ar.getString("reviewerName").toString() );            
    }