中軟培訓-實現分頁功能

中軟培訓-實現分頁功能

實體類pojo

public class PageInfo<T> {
    private int currentPage;  //當前頁面
    private int pageSize;	  //一個頁面顯示幾個房型
    private List<T> lists;	  //數組集合
    private int totalPage;    //總頁數
    private int totalCount;   //查到的內容的總數

    //實體的 Get Set方法和toString方法
    public int getCurrentPage() {
        return currentPage;
    }

    public void setCurrentPage(int currentPage) {
        this.currentPage = currentPage;
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public List<T> getLists() {
        return lists;
    }

    public void setLists(List<T> lists) {
        this.lists = lists;
    }

    public int getTotalPage() {
        return totalPage;
    }

    public void setTotalPage(int totalPage) {
        this.totalPage = totalPage;
    }

    public int getTotalCount() {
        return totalCount;
    }

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

    @Override
    public String toString() {
        return "PageInfo{" +
                "currentPage=" + currentPage +
                ", pageSize=" + pageSize +
                ", lists=" + lists +
                ", totalPage=" + totalPage +
                ", totalCount=" + totalCount +
                '}';
    }
}

ServiceImpl部分代碼

@Override
    public PageInfo<HouseView> searchHouseByType(int currentPage, int houseType) {

        HashMap<String,Object> map = new HashMap<>();
        map.put("size",5);//設置每一頁的數量爲5
        PageInfo<HouseView> pageInfo = new PageInfo<>();
        pageInfo.setCurrentPage(currentPage);  //設置當前頁爲第一頁 從JSP頁面傳了當前頁爲1
        pageInfo.setPageSize(5);  //傳給PageInfo每一頁的內容數量爲5
        int count = houseDao.selectCount(houseType);  //通過mapper來實現內容的總數
        pageInfo.setTotalCount(count); //傳給PageInfo內容的總數
        
        //start爲每次開始查詢的內容 第一頁從1開始第二頁就從6開始
        map.put("start",(currentPage-1)*pageInfo.getPageSize());//設置開始查詢的內容
        
        map.put("houseType",houseType);//設置房型
        List<HouseView> houseViews = houseDao.searchHouseByTypeAndPage(map);
        pageInfo.setLists(houseViews);
        Double c = Double.valueOf(count);
        Double totalPage = Math.ceil(c/pageInfo.getPageSize());
        pageInfo.setTotalPage(totalPage.intValue());
        return pageInfo;
    }

Mapper頁面代碼 關鍵詞 limit

    <select id="searchHouseByTypeAndPage" resultType="com.yiju.pojo.HouseView">
        select * from tb_house a,tb_house_info b,tb_user c where a.is_delete=0 and a.house_id=b.house_id and
        a.user_id=c.user_id AND a.house_type=#{houseType}
        order by a.house_id desc limit #{start},#{size}
    </select>

jsp部分

<div class="pull-right">
	<ul class="pagination">
        
        //判斷是否爲第一頁
    	<li><a href="${pageContext.request.contextPath}/house/searchHouseByType.do?houseType=1&currentPage=1" aria-label="Previous">首頁</a></li>  
        
        //通過將當前頁碼數減一來實現上一頁的功能 
    <c:if test="${pageInfo.currentPage!=1}">
     	<li><a href="${pageContext.request.contextPath}/house/searchHouseByType.do?houseType=1&currentPage=${pageInfo.currentPage-1}">上一頁</a></li>  
    </c:if>
        //用c:if來判斷當前頁在首頁時不再向上一頁
    <c:if test="${pageInfo.currentPage==1}">
     	<li><a href="${pageContext.request.contextPath}/house/searchHouseByType.do?houseType=1&currentPage=1">上一頁</a></li>
  	</c:if>
        
        //使用 c:forEach 來呈現頁碼的數量
    <c:forEach begin="1" end="${pageInfo.totalPage}" var="i">
     	<li><a href="${pageContext.request.contextPath}/house/searchHouseByType.do?houseType=1&currentPage=${i}">${i}</a></li>
    </c:forEach>
        
        //通過將當前頁碼數加一來實現下一頁的功能 
	<c:if test="${pageInfo.currentPage!=pageInfo.totalPage}">
       	<li><a href="${pageContext.request.contextPath}/house/searchHouseByType.do?houseType=1&currentPage=${pageInfo.currentPage+1}">下一頁</a></li>
    </c:if>
         //用c:if來判斷當前頁在尾頁時不再向下一頁
    <c:if test="${pageInfo.currentPage==pageInfo.totalPage}">
		<li><a href="${pageContext.request.contextPath}/house/searchHouseByType.do?houseType=1&currentPage=${pageInfo.totalPage}">下一頁</a></li>
     </c:if>
        
        //跳轉到總頁數相對應的頁面
		<li><a href="${pageContext.request.contextPath}/house/searchHouseByType.do?houseType=1&currentPage=${pageInfo.totalPage}" aria-label="Next">尾頁</a></li>
     </ul>
</div>