反序列化沒有名稱的JSON對象

Question

我們有一個相當奇怪的JSON有效負載需要反序列化，但我不確定如何去用Java和Gson來完成它。

{ 
    "Red": { 
      "Level 1": "Specify Action", 
      "Level 2": "Action Taken", 
      "Level 3": "No Action Taken" 
    }, 
    "Orange": { 
      "Level 4": "Defeat Gannon", 
      "Level 5": "Save Princess", 
      "Level 6": "Find Triforce" 
    } 
} 

我們可以用一個HashMap反序列化的單個對象（即「紅色」和「橙色」），但我們現在正試圖佔父對象的問題，正如代碼所示，沒有任何名字可以輕鬆入侵。

Answer 1

考慮到您的JSON看起來像如下：

{ 
    "Red": { 
     "Level 1": "Specify Action", 
     "Level 2": "Action Taken", 
     "Level 3": "No Action Taken" 
    }, 
    "Orange": { 
     "Level 4": "Defeat Gannon", 
     "Level 5": "Save Princess", 
     "Level 6": "Find Triforce" 
    } 
} 

我將使用HashMap的，像下面傑克遜API。我認爲類似的也可以使用GSON來完成

import com.fasterxml.jackson.core.type.TypeReference; 
import com.fasterxml.jackson.databind.ObjectMapper; 

     import java.io.IOException; 
     import java.util.HashMap; 
     import java.util.Map; 

     public class Test { 

      public static void main(String[] args) throws IOException { 

       ObjectMapper mapper = new ObjectMapper(); 
       String jsonInString = "{\n" + 
         " \"Red\": {\n" + 
         "  \"Level 1\": \"Specify Action\",\n" + 
         "  \"Level 2\": \"Action Taken\",\n" + 
         "  \"Level 3\": \"No Action Taken\"\n" + 
         " },\n" + 
         " \"Orange\": {\n" + 
         "  \"Level 4\": \"Defeat Gannon\",\n" + 
         "  \"Level 5\": \"Save Princess\",\n" + 
         "  \"Level 6\": \"Find Triforce\"\n" + 
         " }\n" + 
         "}"; 

       TypeReference< Map<String, HashMap<String, String>>> typeRef 
         = new TypeReference<Map<String, HashMap<String, String>>>() { 
       }; 

       Map<String, HashMap<String, String>> value = mapper.readValue(jsonInString, typeRef); 

       System.out.println(value); 

      } 
     }