SSH简单实现分页功能

最新推荐文章于 2019-02-15 09:24:00 发布

原创最新推荐文章于 2019-02-15 09:24:00 发布 · 1.7k 阅读

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#分页 #SSH #框架

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本文介绍了一个基于Struts2框架实现的用户列表展示及分页功能。通过整合Spring和Hibernate技术，实现了用户数据的分页加载和展示。文章详细展示了Action、Service、DAO层的代码实现，并提供了Struts配置文件及页面展示代码。

Action

package action;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import java.util.List;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import entity.User;
import service.Userservice;

public class Useraction extends ActionSupport {
private Userservice userservice;
public void setUserservice(Userservice userservice) {
	this.userservice = userservice;
}


public String userlist(){
	int pageNos;	//当前页数
	int count=userservice.usercount();//总条数
	int countPage;//总页数
	//取决于每页的数目奇数还是偶数，现在为偶数
	if(count%2==0) {
	 countPage=count/2;//每页两条数目的总页数
	}else {
		 countPage=count/2+1;
	}
	/* 
	 * 取决于每页的数目奇数还是偶数，现在为奇数
	if(count%2==0) {
	 countPage=count/3+1;//每页三条数目的总页数
	}else {
		 countPage=count/3;
	}
	 */
	List<User> list=userservice.userlist();
	HttpServletRequest request = ServletActionContext.getRequest();  
	if(request.getParameter("pageNos")==null || Integer.parseInt(request.getParameter("pageNos"))<1) {
		pageNos=1;
	}else {
		pageNos=Integer.parseInt(request.getParameter("pageNos"));
	}
	ActionContext.getContext().getSession().put("pageNos", pageNos);
	ActionContext.getContext().getSession().put("list", list);
	ActionContext.getContext().getSession().put("countPage", countPage);
	return "ok";
}
}

Service

package service;

import java.util.List;

import org.springframework.transaction.annotation.Transactional;

import dao.Userdao;
import entity.User;

@Transactional
public class Userservice {
	 private Userdao userdao;  	   
	    public void setUserdao(Userdao userdao) {
		this.userdao = userdao;
	}

		public List<User> userlist() {
	    	return userdao.userlist();
	    }
	    
	    public int usercount() {
	    	return userdao.usercount();
	    }
}

Dao

package dao;

import java.util.List;

import entity.User;

public interface Userdao {

public 	List<User> userlist();

public int usercount();

}

DaoImpl

package dao;

import java.util.List;

import org.hibernate.Query;
import org.springframework.orm.hibernate5.HibernateTemplate;

import com.opensymphony.xwork2.ActionContext;

import entity.User;

public class Userdaoimpl implements Userdao {
	private HibernateTemplate hibernateTemplate;    
    public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {  
        this.hibernateTemplate = hibernateTemplate;  
    }
    
@Override
public List<User> userlist() {
	List<User> list =(List<User>)	hibernateTemplate.find("from User");
		return list;
	}

@Override
public int usercount() {
	List<User> list =(List<User>)	hibernateTemplate.find("from User");
	int count = list.size();
	return count;
	
}
}

Struts.xml

<?xml version="1.0" encoding="UTF-8"?>  
<!DOCTYPE struts PUBLIC  
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"  
    "http://struts.apache.org/dtds/struts-2.3.dtd">  
<struts>  
    <package name="demo1" extends="struts-default" namespace="/">
         <action name="userAction" class="userAction" method="userlist">  
        <result name="ok">Userlist.jsp</result>   
        </action> 
    </package>  
</struts>

前端

Userhome.jsp

<%@ 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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<a href="userAction.action">用户列表</a>
</body>
</html>

Userlist.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<table border="1px" width="500px">
<tr>
<td>序号</td>
<td>用户名</td>
<td>密码</td>
</tr>
<c:forEach items="${list}" var="user" begin="${(pageNos-1)*2}" end="${pageNos*2-1}">
<tr>
<td>${user.uid}</td>
<td>${user.username}</td>
<td>${user.password}</td>
</tr>
</c:forEach>
<tr>
<td colspan="3" align="center">
<c:if test="${pageNos>1}">
<a href="userAction?pageNos=1">首页</a>
<a href="userAction?pageNos=${pageNos-1 }">上一页</a>
</c:if>
<c:if test="${pageNos<countPage}">
<a href="userAction?pageNos=${pageNos+1 }">下一页</a>
<a href="userAction?pageNos=${countPage }">末页</a>
</c:if>
<form action="userAction.action" method="post">
共${countPage}页
跳转到第几<input type="text" name="pageNos" >页 
<input type="submit" value="go">
</form>
</td>
</tr>
</table>
</body>
</html>

部分代码参考：https://www.cnblogs.com/xwlych/p/6017833.html