分页2

分页

1、Controller是起点

	@RequestMapping("courseListByPage")
	public String courseListByPage(PageBean<Course> pageBean,Model model){
		Message message = new Message();
			//第一次进来时，没有任何数据提交个pageBean对象，但是该对象已经实例化，这时参数为null
		if(pageBean.getNowPage()==null) {
			pageBean.setNowPage(1);
		}
		pageBean.setPageRow(5);

		//获得数据表中的所有用户信息
		List<Course> courseList = courseService.selectByPage(pageBean);
		pageBean.setList(courseList);
		
		int countRow = courseService.countAll(pageBean);
		pageBean.setCountRow(countRow);
		
		int countPage = pageBean.getCountRow()%pageBean.getPageRow()==0?pageBean.getCountRow()/pageBean.getPageRow():pageBean.getCountRow()/pageBean.getPageRow()+1;
		System.out.println(countPage+"-----------0000______________________---");
		pageBean.setCountPage(countPage);
			
		model.addAttribute("pageBean", pageBean);
		System.out.println(pageBean+"-------------------");
		System.out.println(countRow);
		
		return "course/courseListByPage";
	}

2、pageBean

public class PageBean<T> {
	private Integer nowPage;
	private Integer pageRow;
	private Integer countRow;
	private Integer countPage;
	private List<T> list;
	private String queryVal;
}

3、mapper.xml

  <select id="countAll" resultType="int" parameterType="pageBean">
  	select count(*) from course
 	<where>
	<if test="queryVal!=null">
		courseName like CONCAT('%',#{queryVal},'%')
	if>
	where>
  select>
  
  	<select id="selectByPage" parameterType="pageBean" resultType="course">
		select * from course
		
		<where>
			<if test="queryVal!=null">
				courseName like CONCAT('%',#{queryVal},'%')
			if>
		where>
		
		order by courseID desc
		limit ${(nowPage-1)*pageRow},${pageRow} 
	select>

4、courseListByPage页面

              <tbody>
               	<c:forEach items="${pageBean.list}" var="course" varStatus="i">
	                <tr class="animated bounceInRight">
					  <td>${i.count}td>
	                  <td>${course.coursename}td>
	                  <td>${course.coursetype}td>
	                  <td>${course.coursescore}   (学分)td>
	                  <td>
						  <button type="button" onclick="location.href='${ItemPath}/course/courseEdit?courseid='+${course.courseid}" class="btn btn-primary btn-xs"><i  class=" glyphicon glyphicon-pencil">i>button>
					      <button type="button" onclick="location.href='${ItemPath}/course/courseDel?courseid='+${course.courseid}" class="btn btn-danger btn-xs"><i class=" glyphicon glyphicon-remove">i>button>
					  td>
	                tr>         
              	c:forEach>
              	<tr>
				     <td colspan="6" align="center" class="animated bounceInDown">
						<ul class="pagination">
							<li ><a href="${ItemPath}/course/courseListByPage?nowPage=${pageBean.nowPage==1?1:pageBean.nowPage-1}">上一页a>li>		
 							<c:forEach  begin="1" end="${pageBean.countPage}" var="num" >
									<li ><span><a href="${ItemPath}/course/courseListByPage?nowPage=${num}">${num}a>span>li>
							c:forEach>
							<li ><a href="${ItemPath}/course/courseListByPage?nowPage=${pageBean.nowPage==pageBean.countPage?pageBean.nowPage:pageBean.nowPage+1}">下一页a>li>
						ul>
					 td>
              	tr>
              tbody>