package jeffli_10;import java.util.ArrayList;import java.util.List;/** 分页类：根据总记录数和分页大小对 {@link List} 进行分页处理 */public class Pagination{    public static final int DEFAULT_PAGE_SIZE = 10;        private int rowCount;    private int currentPage;    private int pageSize;    private int pageCount;        private List<?> list;        public Pagination(List<?> list)    {        this(list, DEFAULT_PAGE_SIZE);    }        public Pagination(List<?> list, int pageSize)    {        this.currentPage    = 1;        this.list            = list;        this.rowCount        = list.size();                setPageSize(pageSize);    }        private void adjustPageCount()    {        pageCount = (rowCount + pageSize - 1) / pageSize;    }        /** 获取要分页的 {@link List}  */    public List<?> getList()    {        return list;    }        /** 获取的 {@link List} 当前页内容 */    public List<?> getCurrentList()    {        List<?> currentList = null;                if(currentPage >= 1 && currentPage <= pageCount)        {            int index = (currentPage - 1) * pageSize;            currentList = list.subList(index, (currentPage < pageCount) ? (index + pageSize) : rowCount);        }        return currentList;    }        /** 获取当前页号（从 1 开始） */    public int getCurrentPage()    {        return currentPage;    }    /** 设置当前页号（从 1 开始） */    public boolean setCurrentPage(int page)    {        if(page >= 1 && page <= pageCount)        {            currentPage = page;            return true;        }                return false;    }        /** 转到下一页 */    public boolean nextPage()    {        return setCurrentPage(currentPage + 1);    }    /** 转到上一页 */    public boolean prePage()    {        return setCurrentPage(currentPage - 1);    }    /** 获取分页大小 */    public int getPageSize()    {        return pageSize;    }    /** 设置分页大小 */    public void setPageSize(int size)    {        if(size <= 0)            size = DEFAULT_PAGE_SIZE;                int index = (currentPage - 1) * pageSize;                pageSize = size;                        if(index > pageSize)            currentPage = (index + pageSize - 1) / pageSize;        else            currentPage = 1;            adjustPageCount();    }    /** 获取总页数 */    public int getPageCount()    {        return pageCount;    }            public static void main(String[] args)    {        final int PAGE_SIZE        = 10;        final int LIST_SIZE        = 39;                List<Integer> list = new ArrayList<Integer>();        for(int i = 1; i <= LIST_SIZE; i++)            list.add(i);                Pagination pg = new Pagination(list, PAGE_SIZE);                for(int i = 1; i <= pg.getPageCount(); i++)        {                pg.setCurrentPage(i);                System.out.println(pg.getCurrentList());        }    }    }

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10][11, 12, 13, 14, 15, 16, 17, 18, 19, 20][21, 22, 23, 24, 25, 26, 27, 28, 29, 30][31, 32, 33, 34, 35, 36, 37, 38, 39]

package sedion.jeffli.wmuitp.util;import java.util.List;import org.apache.commons.lang3.StringUtils;import com.google.common.collect.Lists;public class Page<T> {    //public variables     public static final String ASC     = "asc";    public static final String DESC = "desc";    //parameters of page    protected int pageNo         = 1;    protected int pageSize         = -1;        protected String orderBy     = null;    protected String order         = null;        protected boolean autoCount = true;    //results    protected long totalCount     = -1;    protected List<T> result     = Lists.newArrayList();    public Page()     {            }    public Page(int pageSize)     {        this.pageSize = pageSize;    }    /**     * 获得当前页的页号,序号从1开始,默认为1.     */    public int getPageNo()     {        return pageNo;    }    /**     * 设置当前页的页号,序号从1开始,低于1时自动调整为1.     */    public void setPageNo(final int pageNo)     {        this.pageNo = pageNo;        if (pageNo < 1)             this.pageNo = 1;    }    /**     * 返回Page对象自身的setPageNo函数,可用于连续设置。     */    public Page<T> pageNo(final int thePageNo)     {        setPageNo(thePageNo);        return this;    }    /**     * 获得每页的记录数量, 默认为-1.     */    public int getPageSize()     {        return pageSize;    }    /**     * 设置每页的记录数量.     */    public void setPageSize(final int pageSize)     {        this.pageSize = pageSize;    }    /**     * 返回Page对象自身的setPageSize函数,可用于连续设置。     */    public Page<T> pageSize(final int thePageSize)     {        setPageSize(thePageSize);        return this;    }    /**     * 根据pageNo和pageSize计算当前页第一条记录在总结果集中的位置,序号从1开始.     */    public int getFirst()     {        return ((pageNo - 1) * pageSize) + 1;    }    /**     * 获得排序字段,无默认值. 多个排序字段时用‘,‘分隔.     */    public String getOrderBy()     {        return orderBy;    }    /**     * 设置排序字段,多个排序字段时用‘,‘分隔.     */    public void setOrderBy(final String orderBy)     {        this.orderBy = orderBy;    }    /**     * 返回Page对象自身的setOrderBy函数,可用于连续设置。     */    public Page<T> orderBy(final String theOrderBy)     {        setOrderBy(theOrderBy);        return this;    }    /**     * 获得排序方向, 无默认值.     */    public String getOrder()     {        return order;    }    /**     * 设置排序方式向.     *      * @param order     *            可选值为desc或asc,多个排序字段时用‘,‘分隔.     */    public void setOrder(final String order)     {        String lowcaseOrder = StringUtils.lowerCase(order);        String[] orders = StringUtils.split(lowcaseOrder, ‘,‘);        for (String orderStr : orders) {            if (!StringUtils.equals(DESC, orderStr) && !StringUtils.equals(ASC, orderStr)) {// 检查order字符串的合法值                throw new IllegalArgumentException("排序方向" + orderStr + "不是合法值");            }        }        this.order = lowcaseOrder;    }    /**     * 返回Page对象自身的setOrder函数,可用于连续设置。     */    public Page<T> order(final String theOrder)     {        setOrder(theOrder);        return this;    }    /**     * 是否已设置排序字段,无默认值.     */    public boolean isOrderBySetted()     {        return (StringUtils.isNotBlank(orderBy) && StringUtils.isNotBlank(order));    }    /**     * 获得查询对象时是否先自动执行count查询获取总记录数, 默认为false.     */    public boolean isAutoCount()     {        return autoCount;    }    /**     * 设置查询对象时是否自动先执行count查询获取总记录数.     */    public void setAutoCount(final boolean autoCount)     {        this.autoCount = autoCount;    }    /**     * 返回Page对象自身的setAutoCount函数,可用于连续设置。     */    public Page<T> autoCount(final boolean theAutoCount)     {        setAutoCount(theAutoCount);        return this;    }    // -- 访问查询结果函数 --//    /**     * 获得页内的记录列表.     */    public List<T> getResult()     {        return result;    }    /**     * 设置页内的记录列表.     */    public void setResult(final List<T> result)     {        this.result = result;    }    /**     * 获得总记录数, 默认值为-1.     */    public long getTotalCount()     {        return totalCount;    }    /**     * 设置总记录数.     */    public void setTotalCount(final long totalCount)     {        this.totalCount = totalCount;    }    /**     * 根据pageSize与totalCount计算总页数, 默认值为-1.     */    public long getTotalPages()     {        if (totalCount < 0)             return 1;                long count = totalCount / pageSize;                if (totalCount % pageSize > 0)             count++;        return count;    }    /**     * 是否还有下一页.     */    public boolean isHasNext()    {        return (pageNo + 1 <= getTotalPages());    }    /**     * 取得下页的页号, 序号从1开始. 当前页为尾页时仍返回尾页序号.     */    public int getNextPage()     {        if (isHasNext())            return pageNo + 1;        else             return pageNo;    }    /**     * 是否还有上一页.     */    public boolean isHasPre()     {        return (pageNo - 1 >= 1);    }    /**     * 取得上页的页号, 序号从1开始. 当前页为首页时返回首页序号.     */    public int getPrePage()     {        if (isHasPre())             return pageNo - 1;        else             return pageNo;    }    public long getBegin()     {        return Math.max(1, getPageNo() - pageSize / 2);    }    public long getEnd()     {        return getTotalPages();    }}

package sedion.jeffli.wmuitp.util;import javax.servlet.http.HttpServletRequest;import org.apache.commons.lang3.StringUtils;import com.sun.org.apache.xml.internal.resolver.helpers.PublicId;import sedion.jeffli.wmuitp.entity.SubjectInfor;/** * 分页工具 *  */public class PageUtil {    public static int PAGE_SIZE             = 20;    public static int MAX_SIZE              = 9999;        public static final String PAGE_NUM_STR = "pageNum";        /**     * 初始化分页     * @param page        page对象     * @param request     请求体     * @return     */    public static int[] init(Page<?> page, HttpServletRequest request) {                int pageNum = Integer.parseInt(StringUtils.defaultIfBlank(request.getParameter(PAGE_NUM_STR), "1"));                page.setPageNo(Integer.valueOf(pageNum));        page.setPageSize(page.getPageSize());                int firstResult = page.getFirst() - 1;        int maxResults = page.getPageSize();                return new int[] { firstResult, maxResults };    }}

    <form id="pagerForm" method="post" action="${ctx}/subjectInfor/subjectInfors">        <input type="hidden" name="pageNum"     value=${page.getPageNo()} />        <input type="hidden" name="numPerPage"     value=${page.getPageSize()} />    </form>    <div class="panelBar">        <div class="pages">            <span>显示</span>            <select class="combox" name="numPerPage" onchange="navTabPageBreak({numPerPage:this.value})">                <option value="20"     <#if numPerPage == 20>    selected</#if>>20    </option>                <option value="50"     <#if numPerPage == 50>    selected</#if>>50    </option>                <option value="100" <#if numPerPage == 100>    selected</#if>>100    </option>                <option value="200" <#if numPerPage == 200>    selected</#if>>200    </option>            </select>            <span>条，共${page.getTotalCount()}条</span>        </div>    <div class="pagination" totalCount=${page.getTotalCount()} numPerPage=${page.getPageSize()} pageNumShown="10" currentPage=${page.getPageNo()}></div>

@RequestMapping(value = http://www.mamicode.com/"/subjectInfors")    public ModelAndView subjectInfos()    {            ModelAndView mav = new ModelAndView(SubjectInforWebConstant.getSubjectInforListView());                try {                        Page<SubjectInfor> page = new Page<>(PageUtil.PAGE_SIZE);            int[] pageParams = PageUtil.init(page,request);//分页初始化            subjectInforService.getSubjectInforsPages(page, pageParams);                        mav.addObject(MainWebConstant.getPage(), page);                    } catch (Exception e) {            e.printStackTrace();        }                return mav;    }

@Override    public List<SubjectInfor> getSubjectInforsPages(Page<SubjectInfor> page, int[] pageParams)    {        List<SubjectInfor> results = new ArrayList<>();        StringBuffer resultsHQL = new StringBuffer(All_SUBJECT_INFORS);                try        {            results = subjectInforDAO.findByPage(resultsHQL.toString(), pageParams[0], pageParams[1]);                        page.setTotalCount(subjectInforDAO.getCount(resultsHQL.toString()));            page.setResult(results);                    } catch (Exception e)        {            e.printStackTrace();        }                return results;    }

   /**     * find entity-s of database by hql     * --------------------------------------------------------     * @param(String)     hql                 * @param(String)     offset        当前标识         * @param(String)     pageSize    分页大小     * @return            null/List<T>     */    @SuppressWarnings("unchecked")    public List<T> findByPage(String hql, int offset, int pageSize)     {        if (hql == null)         {            return new ArrayList<T>();        }        Query query = createQuery(hql);        if (!(offset == 0 && pageSize == 0))         {            query.setFirstResult(offset).setMaxResults(pageSize);        }        if (query.list() != null)            return query.list();        else            return null;    }