要反序列化JSON，您需要为递归接口使用自定义反序列化器。在这种类中，您需要检查JSON并确定要实例化为JSON本身的type字段的类。在这里，您有一个我为您编写的示例基本解串器。
当然，管理边界事件可以得到改善（例如，如果没有类型字段，会发生什么情况？）。
package stackoverflow.questions;import java.lang.reflect.Type;import java.util.*;import stackoverflow.questions.Q20254329.*;import com.google.gson.*;import com.google.gson.reflect.TypeToken;public class Q20327670 { static class Complex implements Recursive { Map<String, Recursive> map; @Override public String toString() { return "Complex [map=" + map + "]"; } } static class Simple implements Recursive { @Override public String toString() { return "Simple []"; } } public static class RecursiveDeserializer implements JsonDeserializer<Recursive> { public Recursive deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException { Recursive r = null; if (json == null) r = null; else { JsonElement t = json.getAsJsonObject().get("type"); String type = null; if (t != null) { type = t.getAsString(); switch (type) { case "complex": { Complex c = new Complex(); JsonElement e = json.getAsJsonObject().get("map"); if (e != null) { Type mapType = new TypeToken<Map<String, Recursive>>() {}.getType(); c.map = context.deserialize(e, mapType); } r = c; break; } case "simple": { r = new Simple(); break; } // remember to manage default.. } } } return r; } } public static void main(String[] args) { String json = " { " + " "type" : "complex", " + " "map" : { " + " "a" : { " + " "type" : "simple" " + " }, " + " "b" : { " + " "type" : "complex", " + " "map" : {" + " "ba" : { " + " "type" : "simple" " + " } " + " } " + " } " + " } } "; GsonBuilder gb = new GsonBuilder(); gb.registerTypeAdapter(Recursive.class, new RecursiveDeserializer()); Gson gson = gb.create(); Recursive r = gson.fromJson(json, Recursive.class); System.out.println(r); }}这是我的代码的结果：
Complex [map={a=Simple [], b=Complex [map={ba=Simple []}]}]
