SSM框架实现分页

SSM框架实现分页

1,、首先创建一个分页的工具类

package cn.page.po;

import java.io.Serializable;

public class Page implements Serializable {
	private static final long serialVersionUID = -3198048449643774660L;  

    private int pageNow = 1; // 当前页数  

    private int pageSize = 4; // 每页显示记录的条数  

    private int totalCount; // 总的记录条数  

    private int totalPageCount; // 总的页数  

    @SuppressWarnings("unused")
    private int startPos; // 开始位置，从0开始  

    /**
     * 通过构造函数 传入  总记录数  和  当前页
     * @param totalCount
     * @param pageNow
     */
    public Page(int totalCount, int pageNow) {
        this.totalCount = totalCount;
        this.pageNow = pageNow;
    }  

    /**
     * 取得总页数，总页数=总记录数/每页显示记录的条数
     * @return
     */
    public int getTotalPageCount() {
        totalPageCount = getTotalCount() / getPageSize();
        return (totalCount % pageSize == 0) ? totalPageCount  //总页数
                : totalPageCount + 1;
    }  

    public void setTotalPageCount(int totalPageCount) {
        this.totalPageCount = totalPageCount;
    }  

    public int getPageNow() {
        return pageNow;
    }  

    public void setPageNow(int pageNow) {
        this.pageNow = pageNow;
    }  

    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;
    }
    /**
     * 取得选择记录的初始位置
     * @return
     */
    public int getStartPos() {
        return (pageNow - 1) * pageSize;
    }  

    public void setStartPos(int startPos) {
        this.startPos = startPos;
    }  

}

2、写mapper.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.page.mapper.UserMapper">
<resultMap type="cn.page.po.User" id="userMap">
        <id property="id" column="id" />
        <result property="emplnumb" column="emplnumb" />
        <result property="username" column="username" />
        <result property="password" column="password" />
        <result property="address" column="address" />
</resultMap>
	<!-- 分页SQL语句 -->
	<select id="selectUserByPage" resultMap="userMap">
  		select *
 	 	from user limit #{startPos},#{pageSize}
	</select>
<!-- 取得记录的总数 -->
<select id="getUserCount" resultType="long">
  		SELECT COUNT(*) FROM user
</select>
</mapper>

3、mapper接口

    /**
     * 使用注解方式传入多个参数
     * @param page
     * @return startPos},#{pageSize}
     */
    public List<User> selectUserByPage(@Param(value="startPos") Integer startPos,
    		@Param(value="pageSize") Integer pageSize);

    /**
     * 用户总数
     */
    public long getUserCount();

4、service接口与实现类

 void showUserByPage(HttpServletRequest request,Model model);

　　

@Autowired
private UserMapper userMapper;
	@Override
	public void showUserByPage(HttpServletRequest request, Model model) {
		// TODO Auto-generated method stub
		String pageNow = request.getParameter("pageNow");  

	    Page page = null;  

	    List<User> user = new ArrayList<User>();
	  //查询用户总数
	    int totalCount = (int) userMapper.getUserCount();

	    if (pageNow != null) {
	        page = new Page(totalCount, Integer.parseInt(pageNow));
	        user = this.userMapper.selectUserByPage(page.getStartPos(), page.getPageSize());
	    } else {
	        page = new Page(totalCount, 1);
	        user = this.userMapper.selectUserByPage(page.getStartPos(), page.getPageSize());
	    }  

	    model.addAttribute("user", user);
	    model.addAttribute("page", page);
	}

4、controller方法

@Controller
public class UserController {
	@Autowired
	private UserService userService;
	@RequestMapping("/pagingUser.action")
	public String pagingUser(HttpServletRequest request,Model model){
		userService.showUserByPage(request, model);
		return "pagingUser";

	}
}

5、页面显示

<c:forEach items="${user }" var="user">
		<tr>
			<td>${user.emplnumb }</td>
			<td>${user.username }</td>
			<td>${user.address }</td>
			<td>${user.telephone }</td>
		</tr>
	</c:forEach>
</table>

 <div align="center">
        <font size="2">共 ${page.totalPageCount} 页</font> <font size="2">第
            ${page.pageNow} 页</font> <a href="${pageContext.request.contextPath}/pagingUser.action?pageNow=1">首页</a>
        <c:choose>
            <c:when test="${page.pageNow - 1 > 0}">
                <a href="${pageContext.request.contextPath}/pagingUser.action?pageNow=${page.pageNow - 1}">上一页</a>
            </c:when>
            <c:when test="${page.pageNow - 1 <= 0}">
                <a href="${pageContext.request.contextPath}/pagingUser.action?pageNow=1">上一页</a>
            </c:when>
        </c:choose>
        <c:choose>
            <c:when test="${page.totalPageCount==0}">
                <a href="${pageContext.request.contextPath}/pagingUser.action?pageNow=${page.pageNow}">下一页</a>
            </c:when>
            <c:when test="${page.pageNow + 1 < page.totalPageCount}">
                <a href="${pageContext.request.contextPath}/pagingUser.action?pageNow=${page.pageNow + 1}">下一页</a>
            </c:when>
            <c:when test="${page.pageNow + 1 >= page.totalPageCount}">
                <a href="${pageContext.request.contextPath}/pagingUser.action?pageNow=${page.totalPageCount}">下一页</a>
            </c:when>
        </c:choose>
        <c:choose>
            <c:when test="${page.totalPageCount==0}">
                <a href="${pageContext.request.contextPath}/pagingUser.action?pageNow=${page.pageNow}">尾页</a>
            </c:when>
            <c:otherwise>
                <a href="${pageContext.request.contextPath}/pagingUser.action?pageNow=${page.totalPageCount}">尾页</a>
            </c:otherwise>
        </c:choose>
    </div>

　　

参考博客：http://blog.****.net/zhshulin/article/details/26447713