Ajaxによる3段構えの連動効果を実現

package com.codeXie.entity;

import java.io;

public class Area implements Serializable {
    private String areaid;
    private String areaname;
    private String parentid;
    private Integer arealevel;
    private Integer status;

    public Area() {
    }

    public Area(String areaid, String areaname, String parentid, Integer arealevel, Integer status) {
        this.areaid = areaid;
        this.areaname = areaname;
        this.parentid = parentid;
        this.arealevel = arealevel;
        this.status = status;
    }
    ....... Omits set, get for each property
}

public interface AreaMapper {
    @Select("select * from area where parentid=#{pid}")
    List<Area> selectMore(Integer pid);
}

{{コード

public interface AreaService {
    List<Area> findCity(int pid);
}

@WebServlet("/AreaServlet")
public class AreaServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setCharacterEncoding("utf-8");
        resp.setContentType("text/html;charset=utf-8");
        String pid = req.getParameter("pid");
        AreaServiceImpl service = new AreaServiceImpl();
        List<Area> areas = service.findCity(Integer.parseInt(pid));
        String json = new Gson().toJson(areas);
        resp.getWriter().print(json);
    }
}