// [{"username":"admin","password":"admin"}]


Gson gson = new Gson();
Map<String, String> map = gson.fromJson(jsonListString, Map[].class)[0];
for (Object o : map.keySet()) {
	System.out.println("key=" + o + " value=" + map.get(o));
}

// 将List<Map<String, String>>转换为JSON字符串
        String jsonString = JSON.toJSONString(list);
        System.out.println("JSON String: " + jsonString);
 
        // 将JSON字符串转换回List<Map<String, String>>对象
        List<Map<String, String>> deserializedList = JSON.parseObject(jsonString, List.class);
        System.out.println("Deserialized List: " + deserializedList);

String jsonStr = "[{\"name\":\"张三\",\"id\":1},{\"name\":\"李四\",\"id\":2}]";
List<Map<String, Object>> resultList = JSON.parseObject(jsonStr, new TypeReference<List<Map<String, Object>>>() {});