1.对象转换成json字符串
String str = new Gson().toJson(对象)
2.map转换成 转换成 对象
先转换成json字符串,在转换成对象
String jsonString = GsonUtils.getInstance().toJson(returnBean.getData());
ExpressInfoVo expressInfoVo = GsonUtils.getInstance().fromJson(jsonString,ExpressInfoVo.class);
//
String jsonString = gson.toJson(gson,returnBean.getData());
ExpressInfoVo expressInfoVo =
GsonUtils.getInstance().fromJson(jsonString,ExpressInfoVo.class);
3:json字符串转换成List<object> 集合
Type type = (new TypeToken<List<Object>>() {}).getType();
List<Object> list= GsonUtils.getInstance().fromJson(jsonStr, type );