Struts2 分页
2014-12-31 07:44
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注意，Struts2 分页改进版本已经发布在：/article/1533866.html
代码结构
数据库操作javaBean
package com.rctraffic110.bean;
/**
* create by ni掌柜
* 实现对数据库的访问和操作
*/
import java.sql.*;
public class SqlBean{
/*
* 构造函数
* 加载数据库mysql数据库驱动
*/
public SqlBean(){
try{
//加载驱动器
Class.forName(DatabaseDriver);
}
catch(java.lang.ClassNotFoundException e){
System.err.println("加载驱动器有错误:"+e.getMessage( ));
}
}
/*
*查询数据库信息 select
*@param sql 数据库查询语句
*@param rs 查询结果集
*/
public ResultSet executeSelect(String sql){
rs=null;
try{
conn=DriverManager.getConnection(dateUrl,dbaName,dbaPws);
Statement stmt=conn.createStatement();
rs=stmt.executeQuery(sql);
}
catch(SQLException ex){
System.err.println("执行查询有错误:"+ex.getMessage() );
System.out.print("执行查询有错误:"+ex.getMessage()); //输出到客户端
}
return rs;
}
/*
* 添加数据 insert
* @param sql 数据库添加语句
* @param num 执行的条数
*/
public int executeInsert(String sql){
try{
conn=DriverManager.getConnection(dateUrl,dbaName,dbaPws);
Statement stmt=conn.createStatement( );
int num = stmt.executeUpdate(sql);
return num;
}
catch(SQLException ex){
System.err.println("执行插入有错误:"+ex.getMessage() );
System.out.print("执行插入有错误:"+ex.getMessage());//输出到客户端
return 0;
}
}
/*
* 更新数据库 update
* @param sql 数据库更新语句
* @param num 执行数量
*/
public int executeUpdate(String sql){
rs=null;
try{
conn = DriverManager.getConnection(dateUrl,dbaName,dbaPws);
Statement stmt = conn.createStatement();
int num = stmt.executeUpdate(sql);
return num;
}
catch(SQLException ex){
System.err.println("执行更新有错误:"+ex.getMessage() );
System.out.print("执行更新有错误:"+ex.getMessage()); //输出到客户端
return 0;
}
}
/*
* 删除数据 delete
* @param sql 数据库删除语句
* @param num 执行数量
*/
public int executeDelete(String sql){
try{
conn=DriverManager.getConnection(dateUrl,dbaName,dbaPws);
Statement stmt=conn.createStatement( );
int num = stmt.executeUpdate(sql);
return num;
}
catch(SQLException ex){
System.err.println("执行删除有错误:"+ex.getMessage() );
System.out.print("执行删除有错误:"+ex.getMessage()); //输出到客户端
return 0;
}
}
/*
* 关闭数据库 close
*/
public void closeDB(){
try{
conn.close();
conn = null;
}
catch(Exception end){
System.err.println("执行关闭Connection对象有错误："+end.getMessage( ) );
System.out.print("执行执行关闭Connection对象有错误：有错误:"+end.getMessage()); //输出到客户端
}
}
//定义连接对象
public Connection conn=null;
//定义操作数据库后返回的结果记录集
public ResultSet rs=null;
/////预设初始值
//数据源库驱动器
private String DatabaseDriver="com.mysql.jdbc.Driver";
//DataSource 数据源名称DSN
private String dateUrl = "jdbc:mysql://localhost/rctraffic110";
private String dbaName = "root";
private String dbaPws = "123456";
//定义方法
/*setXxx用于设置属性值;getXxx用于得到属性值*/
public void setDatabaseDriver(String Driver){
this.DatabaseDriver=Driver;
}
public String getDatabaseDriver(){
return (this.DatabaseDriver);
}
public String getDateUrl() {
return dateUrl;
}
public void setDateUrl(String dateUrl) {
this.dateUrl = dateUrl;
}
public String getDbaName() {
return dbaName;
}
public void setDbaName(String dbaName) {
this.dbaName = dbaName;
}
public String getDbaPws() {
return dbaPws;
}
public void setDbaPws(String dbaPws) {
this.dbaPws = dbaPws;
}
}//SqlBean分页业务
package com.rctraffic110.service;
import java.sql.ResultSet;
import java.util.ArrayList;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import com.rctraffic110.bean.SqlBean;
import com.rctraffic110.model.Article;
public class ArticleService {
/*
* 分页显示所有该类别的文章
* @param cno 类别编号
* @param pageSize 每页的大小
* @param pageNow 当前页码
*/
public ArrayList<Article> queryByCnoPaging(String cno, int pageSize, int pageNow){
ResultSet rs = null;
String sql = "";
ArrayList<Article> _articleList = new ArrayList<Article> ();
SqlBean queryByCnoPaging = new SqlBean();
//计算总页数
String _sqlTotall ="SELECT COUNT(*) totalNum FROM article WHERE cno ='"+ cno +"'";
try{
rs = queryByCnoPaging.executeSelect(_sqlTotall );
while(rs.next())
{
HttpServletRequest request = ServletActionContext.getRequest();
//把总记录数放入request
request.setAttribute("totalNum",rs.getInt("totalNum" ) );
//向上取整
int _totallPage = (int) Math.ceil((double) rs.getInt("totalNum" ) /(pageSize*1.0) );
String _notLast = "1";
//已经是最后一页了
if(_totallPage <= pageNow) _notLast = "0";
request.setAttribute("notLast",_notLast);
request.setAttribute("totallPage",_totallPage);
request.setAttribute("pageNow",pageNow);
}
}catch(Exception ee){;}
if ( pageSize > 0 && pageNow > 0) {
sql = "SELECT * FROM article WHERE cno='"+ cno +"' ORDER BY id LIMIT "+(pageNow*pageSize-pageSize)+","+pageSize;
}
try{
rs = queryByCnoPaging.executeSelect(sql);
while(rs.next())
{
// 从数据库中查询出这个类别的指定数目的所有文章
Article _article = new Article();
//赋值
_article.setAno(rs.getString("ano" ) );
_article.setTitle(rs.getString("title" ) );
_article.setAuthor(rs.getString("author" ) );
_article.setContent(rs.getString("content" ) );
_article.setPubdate(rs.getString("pubdate" ) );
//去除日期中的具体时间
String[] unit = _article.getPubdate().split("-" );
_article.setPubdate(unit[0] + "-" + unit[1] + "-" + unit[2] );
_article.setRead(rs.getInt("read" ) );
_article.setSource(rs.getString("source" ) );
_article.setKeyword(rs.getString("keyword" ) );
_article.setImagesrc(rs.getString("imagesrc" ) );
_article.setCno(rs.getString("cno" ) );
_articleList.add(_article );
}
rs.close();
queryByCnoPaging.closeDB();
}catch(Exception ee)
{
;
}
return _articleList;
}
}action控制
package com.rctraffic110.action;
import com.opensymphony.xwork2.ActionSupport;
import com.rctraffic110.bean.SqlBean;
import com.rctraffic110.model.Article;
import com.rctraffic110.service.ArticleService;
import java.sql.*;
import java.util.Map;
import java.util.ArrayList;
import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;
public class ArticleAction extends ActionSupport{
private static final long serialVersionUID = 1L;
public String execute() throws Exception {
return "default";
}
/*
* 分页显示新闻列表
*/
public String queryByCnoPaging()
{
ArticleService articleService = new ArticleService();
this.articleListPaging = articleService.queryByCnoPaging(this.getCno(),
this.getPageSize(),
this.getPageNow());
return SUCCESS ;
}
//类别编号
private String cno;
//用来接受新闻列表的一些参数
private int pageNow = 1 ; //初始化为1,默认从第一页开始显示
private int pageSize = 10 ; //每页显示10条记录
private ArrayList<Article> articleListPaging ; //新闻列表的集合
private Map<String, Object> request;
private Map<String, Object> session;
private Map<String, Object> application;
public String getCno() {
return cno;
}
public void setCno(String cno) {
this.cno = cno;
}
public void setRequest(Map<String, Object> request) {
this.request = request;
}
public void setSession(Map<String, Object> session) {
this.session = session;
}
public void setApplication(Map<String, Object> application) {
this.application = application;
}
public int getPageNow() {
return pageNow;
}
public void setPageNow(int pageNow) {
this.pageNow = pageNow;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public ArrayList<Article> getArticleListPaging() {
return articleListPaging;
}
public void setArticleListPaging(ArrayList<Article> articleListPaging) {
this.articleListPaging = articleListPaging;
}
}struts.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="struts2" extends="struts-default">
<!-- =====================后台管理========================= -->
<!-- 列出所有的新闻 -->
<action name="admin_allArticle" class="com.rctraffic110.action.ArticleAction" method="queryByCnoPaging">
<result name="success">/admin/right/articleList.jsp</result>
<result name="login">/default.jsp</result>
</action>
</package>
</struts>jsp页面
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<!-- 取消编辑 -->
<script type="text/javascript" src="/lunhua/public/deleteconfirm.js">
</script>
<title>所有文章（分页）</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<div align="center">
<table border="0" width="700">
<tr>
<td align="center" height="10" colspan="3">
<p align="left">
<font face="方正舒体" size="6" color="#6699FF"><b>所有文章（分页）</b></font></td>
</tr>
<tr>
<td height="2" align="center" colspan="3">
<hr color="c0c0c0" width="500" align="left"></td>
</tr> </table>
</div>
<div >
<s:if test="null== articleListPaging || articleListPaging.isEmpty()">
没有更多文章了
</s:if>
<s:else>
<table width="" border="1" align="center" style="font-size:11px">
<tr>
<td width="300" align="center" valign="middle">新 闻 标 题</td>
<td width="100" align="center" valign="middle">发表人</td>
<td width="100" align="center" valign="middle">发表日期</td>
<td width="50" align="center" valign="middle">详情</td>
<td width="70" align="center" valign="middle">操作</td>
</tr>
<!-- 对action中传来的参数进行遍历 -->
<s:iterator value="articleListPaging">
<tr>
<td align="center" valign="middle"><s:property value="title"/></td>
<td align="center" valign="middle"><s:property value="author"/></td>
<td align="center" valign="middle"><s:property value="pubdate"/></td>
<td align="center" valign="middle"><a href="detilnews.jsp?id=<s:property value='id'/>">详</a></td>
<td align="center" valign="middle">
<a href="editnews.jsp?id=<s:property value='id'/>">编辑</a>
<b>or</b >
<a href="delnews.action?id=<s:property value='id'/>" onclick="return Confirms();">删除</a>
</td>
</tr>
</s:iterator>
</table>
<!-- 以下是一些翻页操作 -->
共有<s:property value="#request.totalNum" />篇文章 共有<s:property value="#request.totallPage" />页 当前第<s:property value="#request.pageNow" />
<!-- 页码处理 -->
<s:url id="url_pre" value="admin_allArticle.action">
<s:param name="pageNow" value="pageNow-1"></s:param>
<s:param name="cno" value="cno"></s:param>
</s:url>
<s:url id="url_next" value="admin_allArticle.action">
<s:param name="pageNow" value="pageNow+1"></s:param>
<s:param name="cno" value="cno"></s:param>
</s:url>
<!-- 第一页 -->
<s:if test="pageNow == 1">
<s:if test="pageNow < #request.totallPage">
<s:a href="%{url_next}">下一页</s:a>
</s:if>
</s:if>
<s:if test="pageNow > 1">
<!-- 最后一页 -->
<s:if test="pageNow >= #request.totallPage">
<s:a href="%{url_pre}">上一页</s:a>
</s:if>
<!-- 其它普通页面 -->
<s:else>
<s:a href="%{url_pre}">上一页</s:a>
<s:a href="%{url_next}">下一页</s:a>
</s:else>
</s:if>
</s:else> <!-- 有文章结束 -->
</div>
</body>
</html>效果图
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