dao层数据库代码：
package com.hanqi.dao;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import com.hanqi.utility.USer;
public class USerDAO
{
private Configuration cfg = null ;
private ServiceRegistry sr = null ;
private SessionFactory sf = null ;
private Session se = null ;
Transaction ts = null ;
public USerDAO()
{
//初始化Hibernate
cfg = new Configuration().configure() ;
sr = new StandardServiceRegistryBuilder().applySettings(cfg.getProperties()).build() ;
}
public void init()
{
sf = cfg.buildSessionFactory(sr) ;
se = sf.openSession() ;
ts = se.beginTransaction() ;
}
public void destory()
{
ts.commit() ;
se.close() ;
sf.close() ;
}
//查询列表
public List<USer> getAll(int page)
{
List<USer> list = new ArrayList<>() ;
init() ;
//设置每页两行及起始页
list = se.createQuery("from USer").setMaxResults(2)
.setFirstResult((page-1)*2).list() ;
destory();
return list;
}
}
接下来就是jsp页面，这里通过a标签的get方式传递页码
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<a href="addUSer">添加用户</a>
<br><br>
<a href="selectUSer?pages=1" >用户列表</a>
</body>
</html>
跳转到显示界面
1 <%@page import="com.hanqi.utility.USer"%>
2 <%@page import="java.util.List"%>
3 <%@ page language="java" contentType="text/html; charset=UTF-8"
4 pageEncoding="UTF-8"%>
5 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
6 <html>
7 <head>
8 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
9 <title>Insert title here</title>
10 </head>
11 <body>
12 <%
13
14 List<USer> list = (List<USer>)request.getAttribute("selectuser") ;
15
16 for(USer us : list )
17 {
18 out.print(us + "<a href=‘deleteuser?user_id="+us.getUser_id()+"‘> 【删除】</a>"
19 +"<a href=‘modify?userid="+us.getUser_id()+"‘> 【修改】</a>"
20 +"<br>") ;
21 }
22 int pages = Integer.parseInt(request.getParameter("pages")) ;
23
24 %>
25
26 <% if(list.size()==0){response.getWriter().write("页码超出范围") ;
27 response.setHeader("refresh", "3;url=selectUSer?pages=1") ;}else{ %>
28 <%%>
29 <a href="selectUSer?pages=<%=pages-1%>">上一页</a>
30 <a href="selectUSer?pages=<%=pages+1%>">下一页</a>
31 <%} %>
32 </body>
33 </html>
Struts文件配置
1 <!-- 查询全部 --> 2 <action name="selectUSer" class="com.hanqi.action.USerAction" method="selectUSer"> 3 4 <result name="fail">/WEB-INF/pages/fail.jsp</result> 5 6 <result name="success">/WEB-INF/pages/selectUSer.jsp</result> 7 8 </action>
service层方法
public String selectUSer()
{
String rtn = "fail" ;
try
{//得到原生request
HttpServletRequest hsr = ServletActionContext.getRequest() ;
int page = Integer.parseInt(hsr.getParameter("pages")) ;
//page = Integer.parseInt(hsr.getParameter("pagess")) ;
//调用查询的方法
List<USer> list = new UserService().getAll(page);
hsr.setAttribute("pages", page+1);
hsr.setAttribute("selectuser", list);
rtn = "success" ;
}catch(Exception e)
{
e.printStackTrace();
}
return rtn;
}
页码超出时，提示错误（通过jsp的List来判断）Hibernate提供的方法返回的List.size()为行数（最后一页可能少于行数）,若为零则没有数据即可判断
时间： 2024-10-07 09:21:39