The use of MyBatis paging plug-in Pagehelper

@Configuration public
class Mybatisconfig {
    @Bean public
    pagehelper pagehelper () {
        pagehelper Pagehelper = new Pagehelper ();
        Properties Properties = new properties ();
        Properties.setproperty ("Offsetaspagenum", "true");
        Properties.setproperty ("Rowboundswithcount", "true");
        Properties.setproperty ("reasonable", "true");
        Properties.setproperty ("Supportmethodsarguments", "true");
        Properties.setproperty ("Returnpageinfo", "check");
        Properties.setproperty ("params", "Count=countsql");

        Pagehelper.setproperties (properties);
        Return Pagehelper
    }
}

@Getter
@Setter Public
class Pagingparam implements serializable{

    @Min (value = 1, message = "parameter [Pagenum] Wrong ")
    private int pagenum = 1;

    @Min (value = 1, message = "parameter [pageSize] incorrect")
    private int pageSize =;

        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactid>pagehelper </artifactId>
            <version>4.2.1</version>
        </dependency>

   int pagenum = Pagingparam.getpagenum ();
   int pageSize = Pagingparam.getpagesize ();
   Pagehelper.startpage (Pagenum, pageSize);

pageinfo<userdto> PageInfo = new pageinfo<> (list<t> List);  Your data source
  pageinfo.settotal (new pageinfo<> (userinformations). Gettotal ());
  **return new Result (200, "Successful acquisition of all members", Result.constructdata (PageInfo));

 public static <T> map<string, object> constructdata (pageinfo<t> PageInfo)
        {map<string, object> data = new treemap<> ();
        Data.put ("Total", pageinfo.gettotal ());
        Data.put ("Pagenum", Pageinfo.getpagenum ());
        if (pageinfo.getlist () = null | | pageinfo.getlist (). Size () = = 0) {data.put ("list", new arraylist<> ());
        }else {data.put ("list", Pageinfo.getlist ());
    } return data; }

 public result selectallpaging (Pagingparam Pagingparam, httpservletrequest res) {int PA
        Genum = Pagingparam.getpagenum ();

        int pageSize = Pagingparam.getpagesize ();

        String organization = "";
        Pagehelper.startpage (Pagenum, pageSize);
        List<userinformation> userinformations;
        try{userinformations = userinformationmapper.selectbyorganization (organization);
            }catch (Exception e) {e.printstacktrace ();
        Return to new result (400, "unknown error"); } pageinfo<userdto> PageInfo = new Pageinfo<> (Copyfromuserinformationtosuserdto (userinformations, RES)
        );

        Pageinfo.settotal (New pageinfo<> (userinformations). Gettotal ());
    Return to new result (200, "Successful acquisition of all members", Result.constructdata (PageInfo)); }