SSH后台管理系統，實現查詢+分頁

一個搜索框，然后會獲取大量信息，將信息進行分頁，每一頁顯示固定條數。

mysql中使用“like”和“%%”進行模糊匹配，用“limit”進行分頁。

1.首先創建一個頁面信息的實體類，代碼如下：

 

import java.util.List;
public class PageResult1 {
    private List dataList;//滿足查詢條件后的所有數據
    public List getDataList() {
        return dataList;
    }
    public void setDataList(List dataList) {
        this.dataList = dataList;
    }
    //當前頁
    private int currentPage;
    //首頁
    private int firstPage=1;
    //尾頁
    private int lastPage;
    //上一頁
    private int prePage;
    //下一頁
    private int nextPage;
    //總數
    private int totalCount;
    //每頁條數
    private int pageSize=2;
    public int getCurrentPage() {
        return currentPage;
    }
    public void setCurrentPage(int currentPage) {
        this.currentPage = currentPage;
    }
    public int getFirstPage() {
        return firstPage;
    }
    public void setFirstPage(int firstPage) {
        this.firstPage = firstPage;
    }
    public int getLastPage() {
        return lastPage;
    }
    public void setLastPage(int lastPage) {
        this.lastPage = lastPage;
    }
    public int getPrePage() {
        return prePage;
    }
    public void setPrePage(int prePage) {
        this.prePage = prePage;
    }
    public int getNextPage() {
        return nextPage;
    }
    public void setNextPage(int nextPage) {
        this.nextPage = nextPage;
    }
    public int getTotalCount() {
        return totalCount;
    }
    public void setTotalCount(int totalCount) {
        this.totalCount = totalCount;
    }
    public int getPageSize() {
        return pageSize;
    }
    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }
    public PageResult1(List dataList, int currentPage,int pageSize, int totalCount) {//只有datalist和totalCount需要自己寫方法得到
        super();
        this.dataList=dataList;
        this.currentPage = currentPage;
        this.firstPage = 1;
        this.pageSize = pageSize;
        this.totalCount = totalCount;
        //這邊要按順序寫，用myeclipse自動生成的有參構造，順序會有問題，這樣可能無法計算出需要的數值
       this.prePage = currentPage>1 ? currentPage-1 : currentPage;
        this.lastPage = totalCount%pageSize==0 ? totalCount/pageSize : totalCount/pageSize+1;
        
        this.nextPage = currentPage<lastPage ? currentPage+1 : currentPage;                
    }
    public PageResult1() {
        super();
        // TODO Auto-generated constructor stub
    }
}

 

 2.編寫dao實現類中的方法

需要兩個方法分別是：

　//查詢某個商品的數量
    public int findGoods(Integer number);
    //分頁
    public List<Goodsdetail> limit(Integer number,int currentPage,int pageSize);

public class GoodsDetailImpl implements IGoodsDetailDao{
	private HibernateTemplate hibernateTemplate;
	private Goodsdetail goodsdetail;
        @Override
	public int findGoods(Integer number) {
		Session session =	hibernateTemplate.getSessionFactory().getCurrentSession();
		List paraList=new ArrayList<>();
		StringBuffer sb=new StringBuffer("from Goodsdetail g where 1=1 ");
		if(number!=null){
			sb.append(" and g.number = ? ");
			paraList.add(number);
		}
		Query query = session.createQuery(sb.toString());
		for (int i = 0; i < paraList.size(); i++) {
			query.setParameter(i, paraList.get(i));
		}
		List<Goodsdetail> list=query.list();
		int totalCount=list.size();
		return totalCount;
	}
	@Override
	public List<Goodsdetail> limit(Integer number, int currentPage, int pageSize) {
		Session session =	hibernateTemplate.getSessionFactory().getCurrentSession();
		List paraList=new ArrayList<>();
		StringBuffer sb=new StringBuffer("from Goodsdetail g where 1=1 ");
		if(number!=null){
			sb.append(" and g.number = ? ");//這是精確查找，如果改成模糊匹配，把“=”改成like，然后add（‘%’+number+‘%’）
			paraList.add(number);
		}
		Query query = session.createQuery(sb.toString());
		for (int i = 0; i < paraList.size(); i++) {
			query.setParameter(i, paraList.get(i));
		}
		List<Goodsdetail> list=query.setFirstResult((currentPage-1)*pageSize).setMaxResults(pageSize).list();//選擇用hql語句進行分頁
		return list;
	}   
｝  

 3.jsp頁面

js函數：

 

function changesearch(currentPage){    
        $("#currentPage").val(currentPage);
        $("#listform").action="goodsDetail_limit.action";//listform整個表單的名字，訪問action中分頁查詢的方法
        $("#listform").submit();
}
<form method="post" action="" id="listform">
    <input type="hidden" value="${page.currentPage}" name="page.currentPage" id="currentPage">//設置隱藏域，將當前頁的信息傳遞給action
</form>

 

　　　 <tr>
        <td colspan="8"><div class="pagelist"><a href="javascript:changesearch(${page.firstPage})">首頁</a> 
         <a href="javascript:changesearch(${page.prePage})">上一頁</a>
         ${page.currentPage}
         <a href="javascript:changesearch(${page.nextPage})">下一頁</a>
         <a href="javascript:changesearch(${page.lastPage})">尾頁</a> </div></td>
      </tr>

4.action中

省略set get方法和一些其他的屬性，只寫方法

 

public String limit(){
		int pageSize=1;
		int totalCount=goodsDetailService.findGoods(number);//Spring動態代理
		if(page==null){
			int	currentPage=1;
			list=goodsDetailService.limit(number, currentPage, pageSize);
			page=new PageResult1(list, currentPage, pageSize, totalCount);
		}else{
			list=goodsDetailService.limit(number, page.getCurrentPage(), pageSize);
			page=new PageResult1(list, page.getCurrentPage(), pageSize, totalCount);
		}					
		return "ddd";
	}

 

 配置文件省略