SSH后台管理系统，实现查询+分页

一个搜索框，然后会获取大量信息，将信息进行分页，每一页显示固定条数。

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

1.首先创建一个页面信息的实体类，代码如下：

import java.util.List;
public class PageResult1 {
    private List dataList;//满足查询条件后的所有数据
    public List getDataList() {
        return dataList;
    }
    public void setDataList(List dataList) {
        this.dataList = dataList;
    }
    //当前页
    private int currentPage;
    //首页
    private int firstPage=1;
    //尾页
    private int lastPage;
    //上一页
    private int prePage;
    //下一页
    private int nextPage;
    //总数
    private int totalCount;
    //每页条数
    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需要自己写方法得到
        super();
        this.dataList=dataList;
        this.currentPage = currentPage;
        this.firstPage = 1;
        this.pageSize = pageSize;
        this.totalCount = totalCount;
        //这边要按顺序写，用myeclipse自动生成的有参构造，顺序会有问题，这样可能无法计算出需要的数值
        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.编写dao实现类中的方法

需要两个方法分别是：

　//查询某个商品的数量
    public int findGoods(Integer number);
    //分页
    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 = ? ");//这是精确查找，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();//选择用hql语句进行分页
		return list;
	}
｝

 3.jsp页面

js函数：

function changesearch(currentPage){
        $("#currentPage").val(currentPage);
        $("#listform").action="goodsDetail_limit.action";//listform整个表单的名字，访问action中分页查询的方法
        $("#listform").submit();
}
<form method="post" action="" id="listform">
    <input type="hidden" value="${page.currentPage}" name="page.currentPage" id="currentPage">//设置隐藏域，将当前页的信息传递给action
</form>

　　　 <tr>
        <td colspan="8"><div class="pagelist"><a href="javascript:changesearch(${page.firstPage})">首页</a>
         <a href="javascript:changesearch(${page.prePage})">上一页</a>
         ${page.currentPage}
         <a href="javascript:changesearch(${page.nextPage})">下一页</a>
         <a href="javascript:changesearch(${page.lastPage})">尾页</a> </div></td>
      </tr>

4.action中

省略set get方法和一些其他的属性，只写方法

public String limit(){
		int pageSize=1;
		int totalCount=goodsDetailService.findGoods(number);//Spring动态代理
		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