簡單實現jsp分頁

數據分頁，在開發中必不可少，由於數據量太大，不得不進行處理。但是對於分頁，又有很多種方式，比如使用sql語句的limit，或者使用jquery的插件。但是底層的邏輯，都是需要的。
在這裡貼出bean對象的代碼，以及一個輔助類。我做的這個項目是一個個人博客，算是個人網站吧。

(只貼部分底層邏輯代碼)

Page.java

package cn.edu.ldu.util;

public class Page {

  private int everyPage;     //每頁顯示的數量
  private int totalPage;     //總頁數
  private int totalCount;     //總數量
  private int currentPage;    //當前頁
  private int beginIndex;     //起始頁
  private boolean hasPrepage;   //是否有上一頁
  private boolean hasNextPage;  //是否有下一頁

  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 {
  //創建分頁信息對象
  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);
  }

  //獲得每頁顯示記錄數
  public static int getEveryPage(int everyPage) {
    return everyPage == 0 ? 10 : everyPage;
  }

  //獲得當前頁
  public static int getCurrentPage(int currentPage) {
    return currentPage == 0 ? 10 : currentPage;
  }

  //獲得總頁數
  public static int getTotalPage(int everyPage,int totalCount) {
    int totalPage=0;
    //要判斷每頁是否滿頁，否則頁數+1
    if(totalCount!=0 && totalCount%everyPage==0) {
      totalPage=totalCount/everyPage;
    }
    else {
      totalPage=totalCount/everyPage+1;
    }
    return totalPage;
  }

  //獲得起始位置
  public static int getBeginIndex(int everyPage,int currentPage) {
    return everyPage*(currentPage-1);
  }

  //判斷是否有上一頁
  public static boolean getHasPrePage(int currentPage) {
    return currentPage== 1 ? false : true;

  }

  //判斷是否有下一頁
  public static boolean getHasNextPage(int totalPage, int currentPage) {
    return (currentPage == totalPage) || (totalPage == 0) ? false : true;
  }

}

每次我只需要去調用即可。

//傳入每頁顯示的頁數，總記錄數，當前頁
Page page=PageUtil.createPage(5, diaryDao.findAllCount(), currentPage);

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持。