Json文件沒有被讀取 - Java/Gson

Question

我把幾行代碼放在一起來閱讀使用Google的GSON Library的Json，但是當我運行它時收到錯誤。我不知道它是什麼，但我懷疑它可能是JSON是如何被格式化

錯誤：

Exception in thread "main" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 
    at com.google.gson.Gson.fromJson(Gson.java:806) 
    at com.google.gson.Gson.fromJson(Gson.java:761) 
    at tweetfeedreader.main(tweetfeedreader.java:18) 
Caused by: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 
    at com.google.gson.stream.JsonReader.expect(JsonReader.java:339) 
    at com.google.gson.stream.JsonReader.beginArray(JsonReader.java:306) 
    at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:79) 
    at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60) 
    at com.google.gson.Gson.fromJson(Gson.java:795) 
    ... 2 more 

代碼：

import java.io.BufferedReader; 
import java.io.FileNotFoundException; 
import java.io.FileReader; 
import java.lang.reflect.Type; 
import java.util.ArrayList; 

import com.google.gson.Gson; 
import com.google.gson.reflect.TypeToken; 

public class tweetfeedreader { 
    public static void main(String args[]) throws FileNotFoundException { 

     ArrayList<tweet> tCollection = new ArrayList<tweet>(); 
     Gson gson = new Gson(); 
     BufferedReader bufferedReader = new BufferedReader(new FileReader(
       "C:/Users/DX029/Desktop/jsonfile.txt")); 
     Type type = new TypeToken<ArrayList<tweet>>(){}.getType(); 
     ArrayList J_tweet = (ArrayList<tweet>)gson.fromJson(bufferedReader, type); 
     supertweet sup = new supertweet(); 
     for(tweet t: sup.result){ 
      System.out.println(t.text); 
     } 
    } 
} 

鳴叫

public class tweet { 
    String from_user; 
    String from_user_name; 
    String profile_image_url; 
    String text; 

    public tweet(){ 
      } 

} 

supertweet

import java.util.ArrayList; 


public class supertweet { 
    ArrayList<tweet> result; 

    public supertweet(){ 

     result = new ArrayList<tweet>(); 
    } 

    public void setResult(ArrayList<tweet> result) 
    { 
     result = result; 
    } 
} 

添加Json會佔用太多的空間，所以這裏是鏈接。 http://pastebin.com/rPrbfPMb

在此先感謝！

Answer 1

您試圖在實際獲取對象時將Json轉換爲數組。

試着改變你的代碼：

//you need to create this object 
TweetObject J_tweet = (TweetObject) gson.fromJson(bufferedReader, type);