从JSON文件获取int

Question

我有一个JSON文件解析问题。我必须从JSON文件中获取一个int（在这种情况下是播放器Speedys的factionId）。我已经使用这段代码，但它不工作..那有什么问题？ http://pastebin.com/7gvhHpSz

public static JsonObject convertFileToJSON (String fileName){ 

    // Read from File to String 
    JsonObject jsonObject = new JsonObject(); 

    try { 
     JsonParser parser = new JsonParser(); 
     JsonElement jsonElement = parser.parse(new FileReader(fileName)); 
     jsonObject = jsonElement.getAsJsonObject(); 
    } catch (FileNotFoundException e) { 

    } 


    return jsonObject; 
} 



public static String getJsonString(JsonObject json, String path) { 
    String[] parts = path.split("\\."); 
    JsonObject next = null; 
    if (parts.length == 1) { 
     return json.get(parts[0]).getAsString(); 
    } 
    for (int i = 0; i < parts.length; i++) { 
     if (next == null) { 
      next = json.getAsJsonObject(parts[i]); 
      continue; 
     } 
     if (i == (parts.length - 1)) { 
      return next.get(parts[i]).getAsString(); 
     } 
     else { 
      next = next.getAsJsonObject(parts[i]); 
     } 
    } 
    return null; 


} 

public boolean onCommand(CommandSender sender, Command cmd, String label, 
     String[] args) { 
    Player player = (Player) sender; 
    if (cmd.getName().equalsIgnoreCase("myfp")) { 

     if (args.length == 0) { 
      //do something 
     } else if (args[0].equalsIgnoreCase("pacifica")) { 

      JsonObject object = convertFileToJSON ("plugins/Factions/players.json"); 
      int number = getJsonString(object, "Speedys.factionId"); 
      Bukkit.broadcastMessage(text); 

     } 

    } 
    return false; 
} 

我使用GSON和Bukkit。

{ 
    "Speedys": { 
    "factionId": "148", 
    "role": "ADMIN", 
    "title": "", 
    "power": 8.948716666666668, 
    "powerBoost": 0.0, 
    "lastPowerUpdateTime": 1425205197880, 
    "lastLoginTime": 1425205197880, 
    "chatMode": "PUBLIC" 
    }, 
    "stobbie511": { 
    "factionId": "0", 
    "role": "NORMAL", 
    "title": "", 
    "power": 0.7870366666666667, 
    "powerBoost": 0.0, 
    "lastPowerUpdateTime": 1425233475349, 
    "lastLoginTime": 1425233475349, 
    "chatMode": "PUBLIC" 
    }, 
    "demonofloom": { 
    "factionId": "265", 
    "role": "NORMAL", 
    "title": "", 
    "power": -10.0, 
    "powerBoost": 0.0, 
    "lastPowerUpdateTime": 1425304265606, 
    "lastLoginTime": 1425300330188, 
    "chatMode": "PUBLIC" 
    } 
} 

结果应该是“148”。

打印出来的错误是：

java.lang.ClassCastException: org.json.simple.JSONObject cannot be cast to java.lang.String 

Answer 1

小例子，对于GSON使用解析：

Gson gson = new Gson(); 
Speedys speedy = gson.fromJson(String.valueOf("YOUR JSON OBJECT"), Speedys.class); 
int n = speedy.getlastLoginTime(); 

而且Speedys类：

public class Speedys { 

    @SerializedName("factionId") 
    private String factionId; 

    @SerializedName("lastLoginTime") 

    private int lastLoginTime; 


     public String getFactionId() { 
     return factionId; 
    } 

    public void setFactionId(String factionId) { 
     this.factionId = factionId; 
    } 
public int getlastLoginTime() { 
     return lastLoginTime; 
    } 

    public void setlastLoginTime(int lastLoginTime) { 
     this.lastLoginTime = lastLoginTime; 
    }