標籤：資料庫 -- 分享 builds nal eth nbsp creat html 4.01
dao層資料庫代碼：
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() ; } //查詢列表 public List<USer> getAll(int page) { List<USer> list = new ArrayList<>() ; init() ; //設定每頁兩行及起始頁 list = se.createQuery("from USer").setMaxResults(2) .setFirstResult((page-1)*2).list() ; destory(); return list; }}
接下來就是jsp頁面，這裡通過a標籤的get方式傳遞頁碼
<%@ 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">添加使用者</a><br><br><a href="selectUSer?pages=1" >使用者列表</a></body></html>
跳轉到顯示介面
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()+"‘> 【刪除】</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("頁碼超出範圍") ;27 response.setHeader("refresh", "3;url=selectUSer?pages=1") ;}else{ %>28 <%%>29 <a href="selectUSer?pages=<%=pages-1%>">上一頁</a>30 <a href="selectUSer?pages=<%=pages+1%>">下一頁</a>31 <%} %>32 </body>33 </html>
Struts檔案配置
1 <!-- 查詢全部 -->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層方法
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")) ; //調用查詢的方法 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; }
頁碼超出時，提示錯誤（通過jsp的List來判斷）Hibernate提供的方法返回的List.size()為行數（最後一頁可能少於行數）,若為零則沒有資料即可判斷
Struts+Hibernate+jsp頁面 實現分頁
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