GSON反序列化與不斷變化的字段類型

Question

我得到它具有以下結構的JSON：

{"field1": "string", 
"field2": false, 
"a": { 
    "b": { 
     "listString": [] 
    }, 
    "c": { 
     "listString": [], 
     "s": "string" 
    }, 
    "parent": { 
     "childA": { 
      "listString": ["string", "string"] 
     }, 
     "s": "string" 
    }, 
    "parent2": { 
     "listString": ["string", "string"], 
     "s": "string" 
    } 
}, 
"field3": ["s", "s"] 
} 

我現在面臨的問題與parent（和parent2），因爲這些字段的格式可以改變。雖然複雜對象b和c的格式保持不變。例如，我可以得到parent（同樣適用於parent2）以這樣的方式

{"parent": { 
    "childA":{ 
     "listString": ["ssssa", "a"] 
     }, 
    "s": "string" 
}} 

或

{"parent": { 
    "listString": ["ssssa", "a"], 
    "s": "string" 
}} 

此外，childA場（如果存在的話）可以有不同的名稱，也可以是childB或childC

我創建了複雜對象的Java類：

public class MyPojo{ 
    private String[] field1; 
    private String field2; 
    private A a; 
    private String field3;...} 

public class A{ 
    private B b; 
    private C c; 
    private Parent parent; 
    private Parent2 parent2;..} 

public class Parent{ 
    private String s; 
    private ChildA childA;...}... 

如果parent和parent2對象具有不同的合成器，我該如何使用Gson反序列化此類東西？

Answer 1

這是父類：

public class Parent { 
Map<String, JsonElement> parent = null; 

public Map<String, JsonElement> getParent() { 
    return parent; 
} 

public void setParent(Map<String, JsonElement> parent) { 
    this.parent = parent; 
} 

} 

這是主類：

public static void main(String[] args) { 
    // TODO Auto-generated method stub 
    String input = "{\"parent\": {\"s\": \"string\",\"childA\":{\"listString\": [\"ssssa\", \"a\"]}}}"; 
    Gson gsonInstance = null; 

    gsonInstance = new GsonBuilder().create(); 

    Parent p = gsonInstance.fromJson(input, Parent.class); 

    Map<String, JsonElement> parentMap = p.getParent(); 
    Set<String> keyMap = parentMap.keySet(); 

    Iterator<String> iter = keyMap.iterator(); 
    while(iter.hasNext()){ 
     String name = iter.next(); 
     if(name.matches("child(.*)")){ 
      System.out.println(parentMap.get(name)); 
      // do your logic 
     } 
     if (keyMap.contains("listString")){ 
      List<String> listString = getListString(parentMap.get("listString")); 
      System.out.println(listString.toString()); 
     } 
    } 

} 

public static List<String> getListString(JsonElement list){ 
    Type listType = new TypeToken<List<String>>() {}.getType(); 
    List<String> listString = new Gson().fromJson(list, listType); 
    return listString; 
} 

希望它能幫助！