簡單實作jsp分頁

資料分頁，在開發中必不可少，由於資料量太大，不得不進行處理。但對於分頁，又有很多種方式，例如使用sql語句的limit，或是使用jquery的外掛。但是底層的邏輯，都是需要的。 
在這裡貼出bean物件的程式碼，以及一個輔助類別。我做的這個專案是一個個人博客，算是個人網站吧。

(只貼部分底層邏輯程式碼)

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;
  }
 
}

每次我只需要去呼叫即可。

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

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