在有分页需求时，主要是要想到对分页的封装。

这里的需求是按姓名或部门对员工信息进行查询，并对查询结果进行分页。

一、对Page分页进行封装

package cn.ssm.po;

import java.io.Serializable;
import java.util.List;

public class PageBean<T> implements Serializable{
	private int currPage;//当前页数
    private int pageSize;//每页显示的记录数
    private int totalCount;//总记录数
    private int totalPage;//总页数
    private List<T> lists;//每页的显示的数据
	public int getCurrPage() {
		return currPage;
	}
	public void setCurrPage(int currPage) {
		this.currPage = currPage;
	}
	public int getPageSize() {
		return pageSize;
	}
	public void setPageSize(int pageSize) {
		this.pageSize = pageSize;
	}
	public int getTotalCount() {
		return totalCount;
	}
	public void setTotalCount(int totalCount) {
		this.totalCount = totalCount;
	}
	public int getTotalPage() {
		return totalPage;
	}
	public void setTotalPage(int totalPage) {
		this.totalPage = totalPage;
	}
	public List<T> getLists() {
		return lists;
	}
	public void setLists(List<T> lists) {
		this.lists = lists;
	}
}

二、业务层service

对PageBean进行初始化，并向持久层提出分页请求，以及返回一个当前页式数据的list

	public PageBean<PersonDept> findByPage(int currentPage,String name,String deptno){
		HashMap<String,Object> map = new HashMap<String,Object>();
		PageBean<PersonDept> pageBean = new PageBean<PersonDept>();
		
	    //封装当前页数
        pageBean.setCurrPage(currentPage);
        
		//每页显示的数据
		int pageSize=5;
		pageBean.setPageSize(pageSize);
		
		
		PersonDept person=new PersonDept();
		person.setName(name);
		person.setDeptno(deptno);
		//封装总记录数
		int totalCount = personMapperLogin.selectCount(person);
		pageBean.setTotalCount(totalCount);
		
		//封装总页数
		double tc = totalCount;
        Double num =Math.ceil(tc/pageSize);//向上取整
        pageBean.setTotalPage(num.intValue());
      
		map.put("start",(currentPage-1)*pageSize);
		map.put("size", pageBean.getPageSize());
		map.put("name", name);
		map.put("deptno", deptno);
		//封装每页显示的数据
		List<PersonDept> lists = personMapperLogin.findByPage(map);
		pageBean.setLists(lists);
		
		return pageBean;
	}

主要运用sql语句的limit

		<!-- 根据分页数据start 和size查询数据 -->
	<select id="findByPage" parameterType="Map" resultMap="BaseResultMap">
		select
			person.NO,person.Name,person.Sex,person.Birthday,person.Professor,person.password,Dept.DeptName
		from person ,dept 
		<where>
			person.DeptNo=dept.DeptNo 
  			<include refid="query_person_where"></include>
  		</where>
		<if test="start!=null and size!=null">
			limit #{start},#{size}
		</if>
	</select>

	@RequestMapping("/queryPerson1")
	public String queryPerson1(@RequestParam(value="currentPage",defaultValue="1",required=false)int currentPage,Model model,@RequestParam(value="name",defaultValue="",required=false)String name,@RequestParam(value="deptno",defaultValue="",required=false)String deptno){
		model.addAttribute("pagemsg", userService.findByPage(currentPage,name,deptno));//回显分页数据
		model.addAttribute("name", name);
		model.addAttribute("selectedno", deptno);
		return "personlist";
	}

<tr align="center">
<td class="td2" align="center" colspan="8">
   <span>第${requestScope.pagemsg.currPage }/ ${requestScope.pagemsg.totalPage}页</span>  
   <span>总记录数：${requestScope.pagemsg.totalCount }  每页显示:${requestScope.pagemsg.pageSize}</span>  
   <span>
       <c:if test="${requestScope.pagemsg.currPage != 1}">
           <a  href="${pageContext.request.contextPath }/queryPerson1?currentPage=1&name=${name }&deptno=${selectedno }">[首页]</a>  
           <a  href="${pageContext.request.contextPath }/queryPerson1?currentPage=${requestScope.pagemsg.currPage-1}&name=${name }&deptno=${selectedno }">[上一页]</a>  
       </c:if>
       
       <c:if test="${requestScope.pagemsg.currPage != requestScope.pagemsg.totalPage}">
           <a  href="${pageContext.request.contextPath }/queryPerson1?currentPage=${requestScope.pagemsg.currPage+1}&name=${name }&deptno=${selectedno}">[下一页]</a>  
           <a  href="${pageContext.request.contextPath }/queryPerson1?currentPage=${requestScope.pagemsg.totalPage}&name=${name }&deptno=${selectedno }">[尾页]</a>  
       </c:if>
   </span>
</td>
</tr>

六、结果