Hibernate通用分页

1. BaseDao

package com.hibernateSql.dao;
import java.util.Collection;
import java.util.List;
import java.util.Map;

import org.hibernate.Session;
import org.hibernate.query.Query;

import com.hibernateSql.util.PageBean;

/**
 * jdbc：
 * executeQuery(pagebean,sql,clz)
 * sql: select * from book where book_name '%?%'
 *      select * from book where book_name '%xx%'
 * 
 * 分页：1.sql-->countSql-->total-->pagebaen
 *      2.sql-->pagesql-->result
 *      3.处理结果集
 * 
 * hibername
 * 分页：
 * 1.hql-->countHql-->total-->pagebaen
 * 2.Hql-->pageHql-->result
 * 
 * @author Administrator
 *
 */
public class BaseDao {
	
	/**
	 * 如果有带参数，
	 * 命名参数 ：赋值
	 * 
	 * @param query
	 * @param hql
	 */
	public void setParameters(Query<?> query,Map<String, Object> map) {
		
		if(map == null || map.size()==0) {
			return ;
		}
		else {
			//创建map的视图
			Object values=null;
		   for (Map.Entry<String, Object> entry : map.entrySet()) {
			   
			   values=entry.getValue();
			   //判断它的数据类型
			   if(values instanceof Collection) {
				   query.setParameterList(entry.getKey(), (Collection) values);
			   }
			   else if(values instanceof Object[]) {
				   query.setParameterList(entry.getKey(), (Object[]) values);
			   }
			   else {
				   query.setParameter(entry.getKey(), values);
					 
			   }
			   
		}	
			
		}
		
	} 
	
	

	
	/**
	 * 拼接Hqlcount语句
	 */
	
	public String getcountHql(String hql) {
		int index = hql.toUpperCase().indexOf("FROM");
		
		return "select count(*) "+ hql.substring(index);
		
	}
	
	
	
	
	/**
	 * 
	 */
	public List<?> executeQuery(String hql,Map<String, Object> map,PageBean pageBean,Session session){
		
		//判断它是否分页
		if(pageBean != null && pageBean.isPagination()) {
			 //如果分页
			String countHql = getcountHql(hql);
			 //查询出总页数
			Query<?>  query = session.createQuery(countHql); 
			//给这个countHql中的命名参数赋值
			setParameters(query, map);
			String total = query.getSingleResult().toString();
			
			//放入pageBeau
			pageBean.setTotal(total);
			
			
			
			//开始查询数据
			Query<?>  pageQuery = session.createQuery(hql);
			//给命名参数赋值
			this.setParameters(pageQuery, map);
			//设置分页
			pageQuery.setFirstResult(pageBean.getStartIndex());
			pageQuery.setMaxResults(pageBean.getRows());
			
			
			return pageQuery.list();
		}
		else {
			
			//不分页的时候
			Query<?> query = session.createQuery(hql);
			
			//给参数赋值
			setParameters(query, map);
			
			
			return query.list();
		}
		
		
		

	}
	

}

2. PageBean

package com.hibernateSql.util;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

public class PageBean {

	private int page = 1;// 页码
	private int rows = 1;// 行数/页大小
	private int total = 0;// 总记录数

	private boolean pagination = true;// 默认分页

	private String url;// 上一次请求的地址
	private Map<String, String[]> parameterMap;// 上一次请求的所有参数

	public PageBean() {
		super();
	}

	/**
	 * 对分页bean进行初始化
	 * 
	 * @param request
	 */
	public void setRequest(HttpServletRequest request) {
		// 公共参数
		this.setPage(request.getParameter("page"));
		this.setRows(request.getParameter("rows"));
		this.setPagination(request.getParameter("pagination"));

		// 请求地址和请求参数
		this.setUrl(request.getContextPath() + request.getServletPath());
		this.setParameterMap(request.getParameterMap());
	}

	public String getUrl() {
		return url;
	}

	public void setUrl(String url) {
		this.url = url;
	}

	public Map<String, String[]> getParameterMap() {
		return parameterMap;
	}

	public void setParameterMap(Map<String, String[]> parameterMap) {
		this.parameterMap = parameterMap;
	}

	public int getPage() {
		return page;
	}

	public void setPage(int page) {
		this.page = page;
	}

	public void setPage(String page) {
		if (null != page && !"".equals(page.trim())) {
			this.page = Integer.parseInt(page);
		}
	}

	/**
	 *  行数/页大小
	 * @return
	 */
	public int getRows() {
		return rows;
	}

	public void setRows(int rows) {
		this.rows = rows;
	}

	public void setRows(String rows) {
		if (null != rows && !"".equals(rows.trim())) {
			this.rows = Integer.parseInt(rows);
		}
	}

	public int getTotal() {
		return total;
	}

	public void setTotal(int total) {
		this.total = total;
	}

	public void setTotal(String total) {
		this.total = Integer.parseInt(total);
	}

	public boolean isPagination() {
		return pagination;
	}

	public void setPagination(boolean pagination) {
		this.pagination = pagination;
	}

	public void setPagination(String pagination) {
		if ("false".equals(pagination)) {
			this.pagination = false;
		}
	}

	/**
	 * 下一页
	 * 
	 * @return
	 */
	public int getNextPage() {
		int nextPage = page + 1;
		if (nextPage > this.getMaxPage()) {
			nextPage = this.getMaxPage();
		}
		return nextPage;
	}

	/**
	 * 上一页
	 * 
	 * @return
	 */
	public int getPreviousPage() {
		int previousPage = page - 1;
		if (previousPage < 1) {
			previousPage = 1;
		}
		return previousPage;
	}

	/**
	 * 最大页码
	 * 
	 * @return
	 */
	public int getMaxPage() {
		return total % rows == 0 ? total / rows : total / rows + 1;
	}

	/**
	 * 起始记录的下标
	 * 
	 * @return
	 */
	public int getStartIndex() {
		return (page - 1) * rows;
	}

	@Override
	public String toString() {
		return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", pagination=" + pagination + "]";
	}

}

3. StringUtils

package com.hibernateSql.util;


public class StringUtils {
	// 私有的构造方法，保护此类不能在外部实例化
	private StringUtils() {
	}

	/**
	 * 如果字符串等于null或去空格后等于""，则返回true，否则返回false
	 * 
	 * @param s
	 * @return
	 */
	public static boolean isBlank(String s) {
		boolean b = false;
		if (null == s || s.trim().equals("")) {
			b = true;
		}
		return b;
	}
	
	/**
	 * 如果字符串不等于null或去空格后不等于""，则返回true，否则返回false
	 * 
	 * @param s
	 * @return
	 */
	public static boolean isNotBlank(String s) {
		return !isBlank(s);
	}

}