开发笔记:好用的json工具

import com.google.gson.Gson;
//string转bean
Gson gson = new Gson();
UserPage userPage = gson.fromJson(str, UserPage.class);
List data = userPage.getData();
//加字段
userPage.setRecordsFiltered(data.size());
userPage.setRecordsTotal(data.size());
//bean转string
String json = gson.toJson(userPage);