简单实现jsp分页

package cn.edu.ldu.util;

public class page {

  private int everypage;     //每页显示的数量
  private int totalpage;     //总页数
  private int totalcount;     //总数量
  private int currentpage;    //当前页
  private int beginindex;     //起始页
  private boolean hasprepage;   //是否有上一页
  private boolean hasnextpage;  //是否有下一页

  public page() {
  }

  public page(int everypage, int totalpage, int totalcount, int currentpage,int beginindex, boolean hasprepage, boolean hasnextpage)
  {
    this.everypage = everypage;
    this.totalpage = totalpage;
    this.totalcount = totalcount;
    this.currentpage = currentpage;
    this.beginindex = beginindex;
    this.hasprepage = hasprepage;
    this.hasnextpage = hasnextpage;
  }

  public int geteverypage() {
    return everypage;
  }

  public void seteverypage(int everypage) {
    this.everypage = everypage;
  }

  public int gettotalpage() {
    return totalpage;
  }

  public void settotalpage(int totalpage) {
    this.totalpage = totalpage;
  }

  public int gettotalcount() {
    return totalcount;
  }

  public void settotalcount(int totalcount) {
    this.totalcount = totalcount;
  }

  public int getcurrentpage() {
    return currentpage;
  }

  public void setcurrentpage(int currentpage) {
    this.currentpage = currentpage;
  }

  public int getbeginindex() {
    return beginindex;
  }

  public void setbeginindex(int beginindex) {
    this.beginindex = beginindex;
  }

  public boolean ishasprepage() {
    return hasprepage;
  }

  public void sethasprepage(boolean hasprepage) {
    this.hasprepage = hasprepage;
  }

  public boolean ishasnextpage() {
    return hasnextpage;
  }

  public void sethasnextpage(boolean hasnextpage) {
    this.hasnextpage = hasnextpage;
  }

}

package cn.edu.ldu.util;

public class pageutil {
  //创建分页信息对象
  public static page createpage(int everypage,int totalcount,int currentpage) {
    everypage = geteverypage(everypage);
    currentpage = getcurrentpage(currentpage);
    int totalpage = gettotalpage(everypage, totalcount);
    int beginindex = getbeginindex(everypage, currentpage);
    boolean hasprepage = gethasprepage(currentpage);
    boolean hasnextpage = gethasnextpage(totalpage, currentpage);
    return new page(everypage, totalpage,totalcount, currentpage,
        beginindex, hasprepage, hasnextpage);
  }

  //获得每页显示记录数
  public static int geteverypage(int everypage) {
    return everypage == 0 ? 10 : everypage;
  }

  //获得当前页
  public static int getcurrentpage(int currentpage) {
    return currentpage == 0 ? 10 : currentpage;
  }

  //获得总页数
  public static int gettotalpage(int everypage,int totalcount) {
    int totalpage=0;
    //要判断每页是否满页，否则页数+1
    if(totalcount!=0 && totalcount%everypage==0) {
      totalpage=totalcount/everypage;
    }
    else {
      totalpage=totalcount/everypage+1;
    }
    return totalpage;
  }

  //获得起始位置
  public static int getbeginindex(int everypage,int currentpage) {
    return everypage*(currentpage-1);
  }

  //判断是否有上一页
  public static boolean gethasprepage(int currentpage) {
    return currentpage== 1 ? false : true;

  }

  //判断是否有下一页
  public static boolean gethasnextpage(int totalpage, int currentpage) {
    return (currentpage == totalpage) || (totalpage == 0) ? false : true;
  }

}

//传入每页显示的页数，总记录数，当前页
page page=pageutil.createpage(5, diarydao.findallcount(), currentpage);