Struts+Hibernate+jsp页面 实现分页
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