Java paging code

Java paging code

First, the main class is pageview, which encapsulates all the information required to construct a page. As follows:

Public class pageview <t> {

/** Paging data **/

Private list <t> records;

/** Start Index and end index on the page number **/

Private pageindex;

/** Total Page number **/

Private long totalpage = 1;

/** Number of records displayed per page **/

Private int maxresult = 12;

/** Current page **/

Private int currentpage = 1;

/** Total number of records **/

Private long totalrecord;

/** Page number **/

Private int pagecode = 10;

   

Public pageview (int maxresult, int currentpage ){

This. maxresult = maxresult;

This. currentpage = currentpage;

    }

   

Public void setqueryresult (queryrst qr ){

Settotalrecord (qr. gettotalrecord ());

Setrecords (qr. getrstlist ());

    }

   

Public int getpagecode (){

Return pagecode;

    }

 

Public void setpagecode (int pagecode ){

This. pagecode = pagecode;

    }

 

Public long gettotalrecord (){

Return totalrecord;

    }

Public void settotalrecord (long totalrecord ){

This. totalrecord = totalrecord;

Settotalpage (this. totalrecord % this. maxresult = 0? This. totalrecord/this. maxresult: this. totalrecord/this. maxresult + 1 );

    }

Public list <t> getrecords (){

Return records;

    }

Public void setrecords (list <t> records ){

This. records = records;

    }

Public pageindex getpageindex (){

Return pageindex;

    }

Public long gettotalpage (){

Return totalpage;

    }

Public void settotalpage (long totalpage ){

This. totalpage = totalpage;

This. pageindex = webtool. getpageindex (pagecode, currentpage, totalpage );

    }

Public int getmaxresult (){

Return maxresult;

    }

Public int getcurrentpage (){

Return currentpage;

    }

}

Pageindex indicates that the page number starts and ends the index.

Public class pageindex {

Private long startindex;

Private long endindex;

   

Public pageindex (long startindex, long endindex ){

This. startindex = startindex;

This. endindex = endindex;

    }

Public long getstartindex (){

Return startindex;

    }

Public void setstartindex (long startindex ){

This. startindex = startindex;

    }

Public long getendindex (){

Return endindex;

    }

Public void setendindex (long endindex ){

This. endindex = endindex;

    }

   

}

The getpageindex method is used to determine the pageindex status when currenpage is reached, as follows:

Public static pageindex getpageindex (long viewpagecount, int currenpage, long totalpage ){

Long startpage = currenpage-(viewpagecount % 2 = 0? Viewpagecount/2-1: viewpagecount/2 );

Long endpage = currenpage + viewpagecount/2;

If (startpage <1 ){

Startpage = 1;

If (totalpage> = viewpagecount) endpage = viewpagecount;

Else endpage = totalpage;

       }

If (endpage> totalpage ){

Endpage = totalpage;

If (endpage-viewpagecount)> 0) startpage = endpage-viewpagecount + 1;

Else startpage = 1;

       }

Return new pageindex (startpage, endpage );

  }

In addition, place the total number of records in the result set in queryrst.

Public class queryrst <t> {

Private list <t> rstlist;

Private long totalrecord;

// Getter & setter...

}

In use,

Pageview <?> Pageview = new pageview <?> (12, currentpage );

Pageview. setqueryresult (qr );