关于Hibernate分页

1. page.java

java 代码

package com.sclh.rsp.registercenter.common;

public class Page {
    /** imply if the page has previous page */
    private boolean hasPrePage;

    /** imply if the page has next page */
    private boolean hasNextPage;

    /** the number of every page */
    private int everyPage;

    /** the total page number */
    private int totalPage;

    /** the number of current page */
    private int currentPage;

    /** the begin index of the records by the current query */
    private int beginIndex;

    private int totalCount;

    /** The default constructor */
    public Page() {

    }

    /** construct the page by everyPage
     * @param everyPage
     * */
    public Page(int everyPage) {
        this.everyPage = everyPage;
    }

    /** The whole constructor */
    public Page(boolean hasPrePage, boolean hasNextPage, int everyPage,
            int totalPage, int currentPage, int beginIndex,int totalCount) {
        this.hasPrePage = hasPrePage;
        this.hasNextPage = hasNextPage;
        this.everyPage = everyPage;
        this.totalPage = totalPage;
        this.currentPage = currentPage;
        this.beginIndex = beginIndex;
        this.totalCount = totalCount;
    }

    /**
     * @return
     * Returns the beginIndex.
     */
    public int getBeginIndex() {
        return beginIndex;
    }

    /**
     * @param beginIndex
     * The beginIndex to set.
     */
    public void setBeginIndex(int beginIndex) {
        this.beginIndex = beginIndex;
    }

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

    /**
     * @param currentPage
     * The currentPage to set.
     */
    public void setCurrentPage(int currentPage) {
        this.currentPage = currentPage;
    }

    /**
     * @return
     * Returns the everyPage.
     */
    public int getEveryPage() {
        return everyPage;
    }

    /**
     * @param everyPage
     * The everyPage to set.
     */
    public void setEveryPage(int everyPage) {
        this.everyPage = everyPage;
    }

    /**
     * @return
     * Returns the hasNextPage.
     */
    public boolean getHasNextPage() {
        return hasNextPage;
    }

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

    /**
     * @return
     * Returns the hasPrePage.
     */
    public boolean getHasPrePage() {
        return hasPrePage;
    }

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

    /**
     * @return Returns the totalPage.
     *
     */
    public int getTotalPage() {
        return totalPage;
    }

    /**
     * @param totalPage
     * The totalPage to set.
     */
    public void setTotalPage(int totalPage) {
        this.totalPage = totalPage;
    }

    public int getTotalCount() {
        return totalCount;
    }

    public void setTotalCount(int totalCount) {
        this.totalCount = totalCount;
    }
}

 

2. PageUtil.java

java 代码

package com.sclh.rsp.registercenter.common;

public class PageUtil {

    /**
     * Use the origin page to create a new page
     *
     * @param page
     * @param totalRecords
     * @return
     */
    public static Page createPage(Page page, int totalRecords) {
        return createPage(page.getEveryPage(), page.getCurrentPage(),
                totalRecords);
    }

    /**
     * the basic page utils not including exception handler
     *
     * @param everyPage
     * @param currentPage
     * @param totalRecords
     * @return page
     */
    public static Page createPage(int everyPage, int currentPage,
            int totalRecords) {
        everyPage = getEveryPage(everyPage);
        currentPage = getCurrentPage(currentPage);
        int beginIndex = getBeginIndex(everyPage, currentPage);
        int totalPage = getTotalPage(everyPage, totalRecords);
        boolean hasNextPage = hasNextPage(currentPage, totalPage);
        boolean hasPrePage = hasPrePage(currentPage);

        return new Page(hasPrePage, hasNextPage, everyPage, totalPage,
                currentPage, beginIndex, totalRecords);
    }

    private static int getEveryPage(int everyPage) {
        return everyPage == 0 ? 10 : everyPage;
    }

    private static int getCurrentPage(int currentPage) {
        return currentPage == 0 ? 1 : currentPage;
    }

    private static int getBeginIndex(int everyPage, int currentPage) {
        return (currentPage - 1) * everyPage;
    }

    private static int getTotalPage(int everyPage, int totalRecords) {
        int totalPage = 0;

        if (totalRecords % everyPage == 0)
            totalPage = totalRecords / everyPage;
        else
            totalPage = totalRecords / everyPage + 1;

        return totalPage;
    }

    private static boolean hasPrePage(int currentPage) {
        return currentPage == 1 ? false : true;
    }

    private static boolean hasNextPage(int currentPage, int totalPage) {
        return currentPage == totalPage || totalPage == 0 ? false : true;
    }

}

 

3. 应用

java 代码

......
    /**
     * @throws Exception
     * @see com.sclh.rsp.servicecenter.service.IBaseService#queryList(java.lang.String, int)
     */
    public Result queryList(String hql, int currentPage, int everyPage){
        List list = null;
        Result result = null;

        Page page = new Page();
        page.setEveryPage(everyPage);
        page.setCurrentPage(currentPage);

        int totalRecords = 0;

        try {
            totalRecords = adjunctDataDAO.getCount(hql);
            if (totalRecords != 0) {
                page = PageUtil.createPage(page, totalRecords);
                list = adjunctDataDAO.getByPage(hql, page);
                result = new Result(page, list);
            } else {
                // throw new ObjectNotFoundException("adjunctDataNotExist",
                // null);

            }
        } catch (Exception e) {
            log.error(this.getClass()
                    + "中 queryList(String hql, int currentPage) 操作失败!"
                    + e.getMessage());
        }
        return result;
    }
................