HashMap<String, String> jsonToMap(String JsonDetectionString) throws JSONException {

    HashMap<String, String> map = new HashMap<String, String>();
    Gson gson = new Gson();

    map = (HashMap<String, String>) gson.fromJson(JsonDetectionString, map.getClass());

    return map;

}

你可以使用这个类代替:)(处理甚至列表，嵌套列表和json)

public class Utility {

    public static Map<String, Object> jsonToMap(Object json) throws JSONException {

        if(json instanceof JSONObject)
            return _jsonToMap_((JSONObject)json) ;

        else if (json instanceof String)
        {
            JSONObject jsonObject = new JSONObject((String)json) ;
            return _jsonToMap_(jsonObject) ;
        }
        return null ;
    }


   private static Map<String, Object> _jsonToMap_(JSONObject json) throws JSONException {
        Map<String, Object> retMap = new HashMap<String, Object>();

        if(json != JSONObject.NULL) {
            retMap = toMap(json);
        }
        return retMap;
    }


    private static Map<String, Object> toMap(JSONObject object) throws JSONException {
        Map<String, Object> map = new HashMap<String, Object>();

        Iterator<String> keysItr = object.keys();
        while(keysItr.hasNext()) {
            String key = keysItr.next();
            Object value = object.get(key);

            if(value instanceof JSONArray) {
                value = toList((JSONArray) value);
            }

            else if(value instanceof JSONObject) {
                value = toMap((JSONObject) value);
            }
            map.put(key, value);
        }
        return map;
    }


    public static List<Object> toList(JSONArray array) throws JSONException {
        List<Object> list = new ArrayList<Object>();
        for(int i = 0; i < array.length(); i++) {
            Object value = array.get(i);
            if(value instanceof JSONArray) {
                value = toList((JSONArray) value);
            }

            else if(value instanceof JSONObject) {
                value = toMap((JSONObject) value);
            }
            list.add(value);
        }
        return list;
    }
}

将JSON字符串转换为hashmap使用:

HashMap<String, Object> hashMap = new HashMap<>(Utility.jsonToMap(response)) ;

 HashMap<String, String> jsonToMap(String JsonDetectionString) throws JSONException {

    HashMap<String, String> map = new HashMap<String, String>();
    Gson gson = new Gson();

    map = (HashMap<String, String>) gson.fromJson(JsonDetectionString, map.getClass());

    return map;

}

更新新的Gson lib: 你现在可以直接将嵌套的Json解析为Map，但你应该意识到，如果你试图将Json解析为Map<String，对象>类型:它将引发异常。要解决这个问题，只需将结果声明为LinkedTreeMap类型。在下面的例子:

String nestedJSON = "{\"id\":\"1\",\"message\":\"web_didload\",\"content\":{\"success\":1}}";
Gson gson = new Gson();
LinkedTreeMap result = gson.fromJson(nestedJSON , LinkedTreeMap.class);

从gson 2.8.0开始支持以下内容

public static Type getMapType(Class keyType, Class valueType){
    return TypeToken.getParameterized(HashMap.class, keyType, valueType).getType();
}

public static  <K,V> HashMap<K,V> fromMap(String json, Class<K> keyType, Class<V> valueType){
    return gson.fromJson(json, getMapType(keyType,valueType));
}

给你:

import java.lang.reflect.Type;
import com.google.gson.reflect.TypeToken;

Type type = new TypeToken<Map<String, String>>(){}.getType();
Map<String, String> myMap = gson.fromJson("{'k1':'apple','k2':'orange'}", type);