Struts+Hibernate+jsp页面实现分页

Posted 2020-08-19 丶疏影横斜

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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

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