简单实现jsp分页

Java  /  管理员 发布于 7年前   167

数据分页，在开发中必不可少，由于数据量太大，不得不进行处理。但是对于分页，又有很多种方式，比如使用sql语句的limit，或者使用jquery的插件。但是底层的逻辑，都是需要的。
在这里贴出bean对象的代码，以及一个辅助类。我做的这个项目是一个个人博客，算是个人网站吧。

(只贴部分底层逻辑代码)

Page.java

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;  }}

PageUtil.java

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;  }}

每次我只需要去调用即可。

//传入每页显示的页数，总记录数，当前页Page page=PageUtil.createPage(5, diaryDao.findAllCount(), currentPage);

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。