SSH分页

1.pager.java类

import java.util.ArrayList;
import java.util.List;

public class Pager {
    private int dataSize = 0;
    private String pageUrl = "";// 访问每个分页的基准链接
    private int totalRows = 0;// 记录总数

    private int totalPages = 0; // 总页数

    private int pageSize = 10;

    // 每页显示数据条数，默认为10条记录
    private int currentPage = 1; // 当前页数

    private boolean hasPrevious = false; // 是否有上一页

    private boolean hasNext = false; // 是否有下一页

    private boolean hasFirst = false; // 是否显示第一页

    private boolean hasLast = false; // 是否显示最后一页
    private boolean hasCurrent = true;// 是否显示当前页面

    // ? 第一页 ... < 上一页 2 3 4 5 6 下一页 > ... 最后页 ?
    private int navigationCount = 2;// 导航条上显示的最多的分页的个数为navigationCount*2+1 个

    private List data;

    private List<String> prePages = new ArrayList<String>();

    private List<String> postPages = new ArrayList<String>();

    private String isThisCollege="0";

    private List<Object[]> thirdMenu=new ArrayList<Object[]>();

    /**
     *
     */

    public Pager() {
    }

    /**
     * Initialize Pager
     *
     * @param totalRows
     *            total record rows
     * @param pageSize
     *            total record is hold by every page
     */
    public void init(int totalRows, int pageSize) {
        this.totalRows = totalRows;
        this.pageSize = pageSize;
        totalPages = ((totalRows + pageSize) - 1) / pageSize;
        refresh(); // 刷新当前页面信息
    }

    public void init(int totalRows, int curpage, int pageSize) {
        this.totalRows = totalRows;
        this.pageSize = pageSize;
        this.currentPage = curpage;
        this.totalPages = ((totalRows + pageSize) - 1) / pageSize;
        refresh(); // 刷新当前页面信息
    }

    /**
     * @return Returns the currentPage.
     */
    public int getCurrentPage() {
        return currentPage;
    }

    /**
     * @param currentPage
     *            current page
     */
    public void setCurrentPage(int currentPage) {
        this.currentPage = currentPage;
        refresh();
    }

    /**
     * @return Returns the pageSize.
     */
    public int getPageSize() {
        return pageSize;
    }

    /**
     * @param pageSize
     *            The pageSize to set.
     */
    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
        refresh();
    }

    /**
     * @return Returns the totalPages.
     */
    public int getTotalPages() {
        return totalPages;
    }

    /**
     * @param totalPages
     *            The totalPages to set.
     */
    public void setTotalPages(int totalPages) {
        this.totalPages = totalPages;
        refresh();
    }

    /**
     * @return Returns the totalRows.
     */
    public int getTotalRows() {
        return totalRows;
    }

    /**
     * @param totalRows
     *            The totalRows to set.
     */
    public void setTotalRows(int totalRows) {
        this.totalRows = totalRows;
        refresh();
    }

    // 跳到第一页
    public void first() {
        currentPage = 1;

        this.setHasPrevious(false);
        refresh();
    }

    // 取得上一页（重新设定当前页面即可）
    public void previous() {
        currentPage--;
        refresh();
    }

    // 取得下一页
    public void next() {

        //System.out.println("next: totalPages: " + totalPages + " currentPage: " + currentPage);

        if (currentPage < totalPages) {
            currentPage++;
        }
        refresh();
    }

    // 跳到最后一页
    public void last() {
        currentPage = totalPages;

        this.setHasNext(false);
        refresh();
    }

    public boolean isHasNext() {
        return hasNext;
    }

    /**
     * @param hasNext
     *            The hasNext to set.
     */
    public void setHasNext(boolean hasNext) {
        this.hasNext = hasNext;
    }

    public boolean isHasPrevious() {
        return hasPrevious;
    }

    /**
     * @param hasPrevious
     *            The hasPrevious to set.
     */
    public void setHasPrevious(boolean hasPrevious) {
        this.hasPrevious = hasPrevious;
    }

    // 刷新当前页面信息
    public void refresh() {

        if (totalPages <= 1) {
            hasPrevious = false;
            hasNext = false;
            this.hasFirst = false;
            this.hasLast = false;
            this.hasCurrent = false;
            return;
        } else if (currentPage == 1) {
            hasPrevious = false;
            hasNext = true;
        } else if (currentPage == totalPages) {
            hasPrevious = true;
            hasNext = false;
        } else {
            hasPrevious = true;
            hasNext = true;
        }
        if (this.totalPages > this.navigationCount * 2 + 1) {
            if (currentPage - navigationCount > 1) {
                this.hasFirst = true;
            } else {
                this.hasFirst = false;
            }
            if (this.currentPage + navigationCount < totalPages) {
                this.hasLast = true;
            } else {
                this.hasLast = false;
            }

            this.prePages.clear();
            this.postPages.clear();
            int preCount = navigationCount;
            int postCount = navigationCount;
            if (this.currentPage - this.navigationCount < 1) {
                preCount = this.currentPage - 1;
                postCount = this.navigationCount * 2 - preCount;
            } else if (this.currentPage + this.navigationCount > this.totalPages) {
                postCount = this.totalPages - this.currentPage;
                preCount = this.navigationCount * 2 - postCount;
            }

            for (int i = preCount; i >= 1; i--) {
                if (this.currentPage - i > 0) {
                    this.prePages.add(String.valueOf(currentPage - i));
                }
            }
            for (int j = 1; j <= postCount; j++) {
                if (this.currentPage + j <= this.totalPages)
                    this.postPages.add(String.valueOf(this.currentPage + j));
            }

        } else {
            this.hasFirst = false;
            this.hasLast = false;
            this.prePages.clear();
            this.postPages.clear();
            for (int i = 1; i < this.currentPage; i++) {
                this.prePages.add(String.valueOf(i));
            }
            for (int j = this.currentPage + 1; j <= this.totalPages; j++) {
                this.postPages.add(String.valueOf(j));
            }

        }

    }

    public List getData() {
        return data;
    }

    public void setData(List data) {
        this.data = data;
        this.dataSize = data.size();
    }

    public boolean isHasFirst() {
        return hasFirst;
    }

    public void setHasFirst(boolean hasFirst) {
        this.hasFirst = hasFirst;
    }

    public boolean isHasLast() {
        return hasLast;
    }

    public void setHasLast(boolean hasLast) {
        this.hasLast = hasLast;
    }

    public int getNavigationCount() {
        return navigationCount;
    }

    public void setNavigationCount(int navigationCount) {
        this.navigationCount = navigationCount;
    }

    public List getPostPages() {
        return postPages;
    }

    public void setPostPages(ArrayList<String> postPages) {
        this.postPages = postPages;
    }

    public List getPrePages() {
        return prePages;
    }

    public void setPrePages(ArrayList<String> prePages) {
        this.prePages = prePages;
    }

    public boolean isHasCurrent() {
        return hasCurrent;
    }

    public void setHasCurrent(boolean hasCurrent) {
        this.hasCurrent = hasCurrent;
    }

    public String getPageUrl() {
        return pageUrl;
    }

    public void setPageUrl(String pageUrl) {
        this.pageUrl = pageUrl;
    }

    public int getDataSize() {
        return dataSize;
    }

    public void setDataSize(int dataSize) {
        this.dataSize = dataSize;
    }

    public String getIsThisCollege() {
        return isThisCollege;
    }

    public void setIsThisCollege(String isThisCollege) {
        this.isThisCollege = isThisCollege;
    }

    public List<Object[]> getThirdMenu() {
        return thirdMenu;
    }

    public void setThirdMenu(List<Object[]> thirdMenu) {
        this.thirdMenu = thirdMenu;
    }

}

2.action中pager类的用法

Pager pager = new Pager();
int totalRows = service.countTotalRows();//根据条件查询出总共行数
pager.init(totalRows, curpageInt, perpage);
pager.setPageUrl(url);//url是查询条件,url="/subadminPoster.do?act=searchRev&curpage"
List list = service.getData();//根据条件查询list
pager.setData(list);
request.setAttribute("pager", pager);

3.hibernate配合pager类的使用

    public List getDataList(final String hql, final Integer curpage, final Integer perpage)
            throws Exception {
        HibernateTemplate ht = new HibernateTemplate(this.getSessionFactory());
        return (List) ht.execute(new HibernateCallback() {
            public Object doInHibernate(Session session) throws HibernateException {
                Query query = session.createQuery(hql);
                query.setFirstResult((curpage - 1) * perpage);
                query.setMaxResults(perpage);
                List result = query.list();
                return result;
            }
        });
    }

4.jsp中对应的显示分页条

    
    
        « 第一页
        ...
    
    
        < 上一页
    
    
        ${looppage}
    
    
        ${pager.currentPage}
    
    
        ${looppage}
    
    
        下一页 >
    
    
        ...
        最后页 »
    

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