android JSON reader - IllegalStateException;預期的名稱，但字符串

我想使用Json閱讀器來解析通過.json文件插入記錄到我的數據庫，但我有通過文件讀取問題。android JSON reader - IllegalStateException;預期的名稱，但字符串

我故意用try/catch子句打開了解析/閱讀器的方法，所以我可以看到錯誤來自哪裏。

這裏是JSON解析器/ Reader類：

package cybertech.productions.servicehelpers; 

import java.io.BufferedInputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.net.MalformedURLException; 
import java.net.URL; 
import java.util.ArrayList; 

import android.content.Context; 

import com.google.gson.stream.JsonReader; 
import com.google.gson.stream.JsonToken; 

public class JsonParser { 

    public void readCardJsonStream1(String cardSet, CarddbAdapter yugiohDB, 
      Context context) throws IOException { 

     URL test = new URL(cardSet); 
     InputStream in = new BufferedInputStream(test.openStream()); 

     JsonReader reader = new JsonReader(new InputStreamReader(in, 
       "ISO-8859-1")); 

     String s, s1, s2, levelstr, rankstr, atkstr, defstr, setnumstr, cardpasstr; 

     int numTotalElements = 0; 
     int elementsParsed = 0; 

     reader.beginObject(); 
     s = reader.nextName(); 

     reader.beginObject(); 
     while (reader.hasNext()) { 

      s = reader.nextName(); 
      if (s.equalsIgnoreCase("p")) { // cards 

       reader.beginObject(); 
       while (reader.hasNext()) { 
        s1 = reader.nextName(); 
        if (s1.equalsIgnoreCase("o")) { // card 
         YugiohCard c; 
         reader.beginArray(); 
         while (reader.hasNext()) { 

          reader.beginObject(); 
          c = new YugiohCard(); 
          while (reader.hasNext()) { 
           s2 = reader.nextName(); 
           if (s2.equalsIgnoreCase("a")) { // name 
            c.name = reader.nextString(); 
           } else if (s2.equalsIgnoreCase("b")) { // type 
            c.type = reader.nextString(); 
           } else if (s2.equalsIgnoreCase("c")) { // attribute_type 
            c.attributeType = reader.nextString(); 
           } else if (s2.equalsIgnoreCase("d")) { // summon_requirements 
            c.summonRequirements = reader.nextString(); 
           } else if (s2.equalsIgnoreCase("e")) { // description 
            c.description = reader.nextString(); 
           } else if (s2.equalsIgnoreCase("f")) { // spell 
                     // speed 
            c.spellSpeed = reader.nextString(); 

           } else if (s2.equalsIgnoreCase("g")) { // level_stars 
            levelstr = reader.nextString(); 
            c.levelStars = Integer.parseInt(levelstr); 
           } else if (s2.equalsIgnoreCase("h")) { // rank_stars 
            rankstr = reader.nextString(); 
            c.rankStars = Integer.parseInt(rankstr); 
           } else if (s2.equalsIgnoreCase("i")) { // atk_points 
            atkstr = reader.nextString(); 
            c.atk_stat = Integer.parseInt(atkstr); 
           } else if (s2.equalsIgnoreCase("j")) { // def_points 
            defstr = reader.nextString(); 
            c.def_stat = Integer.parseInt(defstr); 
           } else if (s2.equalsIgnoreCase("n")) { // set 
                     // initials 
            c.setinit = reader.nextString(); 
           } else if (s2.equalsIgnoreCase("k")) { // set_number 
            setnumstr = reader.nextString(); 
            c.setNumber = Integer.parseInt(setnumstr); 
           } else if (s2.equalsIgnoreCase("l")) { // card_number_pass 
            cardpasstr = reader.nextString(); 
            c.cardnumberPass = Integer 
              .parseInt(cardpasstr); 
           } 
          } 
          yugiohDB.createDBCard(c); 
          reader.endObject(); 
         } 
         reader.endArray(); 
        } 
       } 
       reader.endObject(); 
      } 
      if (s.equalsIgnoreCase("w")) { // num_cards 
       numTotalElements = reader.nextInt(); 
      } 
     } 
     reader.endObject(); 
     reader.close(); 
    } 
}

這是我的JSON文件：

{ 
    "t": { 
     "p": { 
      "o": [ 
       { 
        "a": "Elemental HERO Absolute Zero", 
        "b": "Monster/Fusion/Effect", 
        "c": "WATER", 
        "d": "1 'HERO' monster + 1 WATER monster", 
        "e": "Blows up your field, sucks for you", 
        "f": "NULL", 
        "g": "8", 
        "h": "0", 
        "i": "2500", 
        "j": "2000", 
        "n": "YG04", 
        "k": "001", 
        "l": "40854197" 
       }, 
       { 
        "a": "Elemental HERO Air Neos", 
        "b": "Monster/Fusion/Effect", 
        "c": "WIND", 
        "d": "Hummingbird + Neos", 
        "e": "Returns to extra at end phase", 
        "f": "NULL", 
        "g": "7", 
        "h": "0", 
        "i": "2500", 
        "j": "2000", 
        "n": "STON", 
        "k": "034", 
        "l": "11502550" 
       }, 
       { 
        "a": "Cyber Jar", 
        "b": "Monster/Effect", 
        "c": "DARK", 
        "d": "NULL", 
        "e": "destroys all monsters on the field", 
        "f": "NULL", 
        "g": "3", 
        "h": "0", 
        "i": "900", 
        "j": "900", 
        "n": "MRL", 
        "k": "077", 
        "l": "34124316" 
       }, 
       { 
        "a": "Wind-Up Carrier Zenmaity", 
        "b": "MACHINE/Xyz/Effect", 
        "c": "WATER", 
        "d": "2 Level 3 monsters", 
        "e": "Special summon a wind-up from your hand or deck.", 
        "f": "NULL", 
        "g": "0", 
        "h": "3", 
        "i": "1500", 
        "j": "1500", 
        "n": "ORCS", 
        "k": "044", 
        "l": "81122844" 
       }, 
       { 
        "a": "BRAIN CONTROL", 
        "b": "Spell", 
        "c": "Spell", 
        "d": "NULL", 
        "e": "Pay 800 Life Points to target 1 face-up monster your opponent controls; take control of that target until the End Phase.", 
        "f": "Normal", 
        "g": "0", 
        "h": "0", 
        "i": "0", 
        "j": "0", 
        "n": "LCYW", 
        "k": "074", 
        "l": "87910978" 
       }, 
       { 
        "a": "Ring of Destruction", 
        "b": "Trap", 
        "c": "Trap", 
        "d": "NULL", 
        "e": "Target 1 face-up monster on the field; destroy that target, and if you do, inflict damage to both players equal to that target's ATK.", 
        "f": "Normal", 
        "g": "0", 
        "h": "0", 
        "i": "0", 
        "j": "0", 
        "n": "YG04", 
        "k": "001", 
        "l": "40854197" 
       } 
      ] 
     }, 
     "v": "2/3/2013" 
    } 
}

這裏是我創建告訴在JSON文件位於我的網站的方法：

public void CreateYUGIsets() throws MalformedURLException, IOException{ 
     yugiohDB.dropDB(); 
     JsonParser parser = new JsonParser(); 
     String cardSetList = "https://sites.google.com/site/yugiohlibrary/patches/test.json"; 
     parser.readCardJsonStream1(cardSetList, yugiohDB, this); 
    }

這裏是logcat的錯誤我得到過：

05-15 22:48:49.362: E/AndroidRuntime(476): FATAL EXCEPTION: main 
05-15 22:48:49.362: E/AndroidRuntime(476): java.lang.RuntimeException: Unable to start activity ComponentInfo{cybertech.productions.yugiohlibrary/cybertech.productions.yugiohlibrary.LoadingScreen}: java.lang.IllegalStateException: Expected a name but was STRING 
05-15 22:48:49.362: E/AndroidRuntime(476): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 
05-15 22:48:49.362: E/AndroidRuntime(476): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
05-15 22:48:49.362: E/AndroidRuntime(476): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
05-15 22:48:49.362: E/AndroidRuntime(476): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
05-15 22:48:49.362: E/AndroidRuntime(476): at android.os.Handler.dispatchMessage(Handler.java:99) 
05-15 22:48:49.362: E/AndroidRuntime(476): at android.os.Looper.loop(Looper.java:123) 
05-15 22:48:49.362: E/AndroidRuntime(476): at android.app.ActivityThread.main(ActivityThread.java:3683) 
05-15 22:48:49.362: E/AndroidRuntime(476): at java.lang.reflect.Method.invokeNative(Native Method) 
05-15 22:48:49.362: E/AndroidRuntime(476): at java.lang.reflect.Method.invoke(Method.java:507) 
05-15 22:48:49.362: E/AndroidRuntime(476): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
05-15 22:48:49.362: E/AndroidRuntime(476): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
05-15 22:48:49.362: E/AndroidRuntime(476): at dalvik.system.NativeStart.main(Native Method) 
05-15 22:48:49.362: E/AndroidRuntime(476): Caused by: java.lang.IllegalStateException: Expected a name but was STRING 
05-15 22:48:49.362: E/AndroidRuntime(476): at com.google.gson.stream.JsonReader.nextName(JsonReader.java:444) 
05-15 22:48:49.362: E/AndroidRuntime(476): at cybertech.productions.servicehelpers.JsonParser.readCardJsonStream1(JsonParser.java:36) 
05-15 22:48:49.362: E/AndroidRuntime(476): at cybertech.productions.yugiohlibrary.LoadingScreen.CreateYUGIsets(LoadingScreen.java:107) 
05-15 22:48:49.362: E/AndroidRuntime(476): at cybertech.productions.yugiohlibrary.LoadingScreen.onCreate(LoadingScreen.java:41) 
05-15 22:48:49.362: E/AndroidRuntime(476): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
05-15 22:48:49.362: E/AndroidRuntime(476): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
05-15 22:48:49.362: E/AndroidRuntime(476): ... 11 more

對於在logcat的這個特定行： cybertech.productions.servicehelpers.JsonParser.readCardJsonStream1（JsonParser.java:36） 05-15 22：48：49.362：E/AndroidRuntime（476）

JsonParser類中的第36行是： s = reader.nextName（）;

當第一個while（）循環開始時，該行就是正確的。

任何幫助，將不勝感激。

來源

2013-05-15 Matthew White

您已選擇最繁瑣的方法來分析您的JSON文件。您使用的庫（Gson）提供了更簡單的方法來處理輸入。下面是一個仍然可以手動解析的例子：

// Your JSON data here 
final String json = ""; 

// Get the array element corresponding to t->p->o, in the data 
final JsonElement rootElem = new JsonParser().parse(json); 
final JsonArray jsonArr = rootElem.getAsJsonObject() 
     .getAsJsonObject("t").getAsJsonObject("p").getAsJsonArray("o"); 

// Iterate through the JSON array, extracting out card info as we go 
final List<Yugioh> cards = new ArrayList<Yugioh>(jsonArr.size()); 
for (final JsonElement objElem : jsonArr) { 
    final JsonObject jsonObj = objElem.getAsJsonObject(); 
    final Yugioh card = new Yugioh(); 

    card.setName(jsonObj.get("a").getAsString()); 
    card.setType(jsonObj.get("b").getAsString()); 
    card.setAttributeType(jsonObj.get("c").getAsString()); 
    card.setSummonRequirements(jsonObj.get("d").getAsString()); 
    card.setDescription(jsonObj.get("e").getAsString()); 
    card.setSpellSpeed(jsonObj.get("f").getAsString()); 
    card.setLevelStars(Integer.parseInt(jsonObj.get("g").getAsString())); 
    card.setRankStars(Integer.parseInt(jsonObj.get("h").getAsString())); 
    card.setAtkStat(Integer.parseInt(jsonObj.get("i").getAsString())); 
    card.setDefStat(Integer.parseInt(jsonObj.get("j").getAsString())); 
    card.setNumber(Integer.parseInt(jsonObj.get("k").getAsString())); 
    card.setCardNumberPass(Integer.parseInt(jsonObj.get("l") 
      .getAsString())); 
    card.setInit(jsonObj.get("n").getAsString()); 

    System.out.println(card); 
    cards.add(card); 
}

注意代碼是多麼可讀。我冒昧地舉例說明正確使用getter/setter，並修正了一些變量名。通過在映射器類中指示要從中複製的JSON屬性的序列化名稱，可以進一步縮短上面的示例。典型的例子，這個映射類：

class Yugioh implements Serializable { 
    private static final long serialVersionUID = -8125568453376399843L; 

    @SerializedName("a") 
    private String name; 

    @SerializedName("b") 
    private String type; 

    @SerializedName("c") 
    private String attributeType; 

    @SerializedName("d") 
    private String summonRequirements; 

    @SerializedName("e") 
    private String description; 

    @SerializedName("f") 
    private String spellSpeed; 

    @SerializedName("g") 
    private Integer levelStars; 

    @SerializedName("h") 
    private Integer rankStars; 

    @SerializedName("i") 
    private Integer atkStat; 

    @SerializedName("j") 
    private Integer defStat; 

    @SerializedName("k") 
    private Integer number; 

    @SerializedName("l") 
    private Integer cardNumberPass; 

    @SerializedName("n") 
    private String init; 

    public Yugioh() { 
     super(); 
    } 

    // Getters/Setters here 

    @Override 
    public String toString() { 
     return String.format("Card %s", getName()); 
    } 
}

可以縮短了顯著的反序列化代碼：

// Your JSON data here 
final String json = ""; 

// Deserialize JSON into a bunch of objects 
final JsonElement rootElem = new JsonParser().parse(json); 
final JsonArray jsonArr = rootElem.getAsJsonObject() 
     .getAsJsonObject("t").getAsJsonObject("p").getAsJsonArray("o"); 
final List<Yugioh> cards = new Gson().fromJson(jsonArr, 
     new TypeToken<List<Yugioh>>() { 
     }.getType()); 

System.out.println(cards);

死的簡單。請務必閱讀Gson User Guide - 它提供了大量關於使用庫的有用信息。

來源

2013-05-16 03:39:57 Perception

非常感謝這個信息和例子，一定會嘗試一下。 –

@Perception如何顯示列表卡片進入列表視圖，之前我使用手動邏輯來解析JSON與GSON lib，實現您的代碼後我能夠通過列表視圖不加載數據的SOP檢索數據！可以解釋如何填充名單列表卡列表視圖（Yugioh Serializable！） –

@Perception我實現了你的解決方案到這個手動解析，但列表視圖停止填充！我需要反序列化名單卡？ http://stackoverflow.com/questions/18140830/gson-throwing-expected-expected-a-name-but-was-number-at-line-1-column-8/18141038?noredirect=1#18141038 –

android JSON reader - IllegalStateException;預期的名稱，但字符串

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