public class Crtl extends HttpServlet { private static Log log = LogFactory.getLog(WacaiRemoteRequest.class); private static ObjectMapper objectMapper = new ObjectMapper(); @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); //这里需要接受调用者传过来的json参数 } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req, resp); } } 写一个接口给别人调用，我需要接收到调用者传过来的json然后转换为list，再去调用另一个接口返回结果，请问怎样接收json？