分页实例代码
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1 Book.java
1 Book.java
package bean;
import java.sql.*;
import java.util.ArrayList;
/**
* Struts分页显示数据Bean，对应数据库中Book表
*/
public class Book {
private String bookname; //书名
private String author; //作者
private String price; //价格
import java.sql.*;
import java.util.ArrayList;
/**
* Struts分页显示数据Bean，对应数据库中Book表
*/
public class Book {
private String bookname; //书名
private String author; //作者
private String price; //价格
public Book(String name,String author,String price){
this.bookname=name;
this.author=author;
this.price=price;
}
this.bookname=name;
this.author=author;
this.price=price;
}
public String getAuthor() {
return author;
}
return author;
}
public void setAuthor(String author) {
this.author = author;
}
this.author = author;
}
public String getBookname() {
return bookname;
}
return bookname;
}
public void setBookname(String bookname) {
this.bookname = bookname;
}
this.bookname = bookname;
}
public String getPrice(){
return this.price;
}
return this.price;
}
public void setPrice(String price){
this.price=price;
}
this.price=price;
}
public static ArrayList getAllBook(Connection connection){
String sql="select * from book";
ArrayList arrayList = new ArrayList();
try{
Statement statement = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
ResultSet resultSet = statement.executeQuery(sql);
System.out.println("BookBean 数据查询已完成！");
while(resultSet.next())
{
String name = resultSet.getString("name");
String author = resultSet.getString("author");
String price = resultSet.getString("price");
System.out.println("开始数据封装：name="+name+"author="+author+"price="+price);
Book book = new Book(name,author,price);
arrayList.add(book);
}
connection.close();
resultSet.close();
}catch(SQLException e)
{
System.out.println("数据库异常"+e.toString());
}
String sql="select * from book";
ArrayList arrayList = new ArrayList();
try{
Statement statement = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
ResultSet resultSet = statement.executeQuery(sql);
System.out.println("BookBean 数据查询已完成！");
while(resultSet.next())
{
String name = resultSet.getString("name");
String author = resultSet.getString("author");
String price = resultSet.getString("price");
System.out.println("开始数据封装：name="+name+"author="+author+"price="+price);
Book book = new Book(name,author,price);
arrayList.add(book);
}
connection.close();
resultSet.close();
}catch(SQLException e)
{
System.out.println("数据库异常"+e.toString());
}
return arrayList;
}
}
}
}
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2 PageBean.java
package page;
import bean.Book;
import java.util.*;
/**
* Struts分页显示逻辑Bean
*/
public class PageBean {
package page;
import bean.Book;
import java.util.*;
/**
* Struts分页显示逻辑Bean
*/
public class PageBean {
int currentPage=1; //当前页
public int totalPages=0; //总页数
int pageRecorders=5;//每页5条数据
int totalRows=0; //总数据数
int pageStartRow=0;//每页的起始数
int pageEndRow=0; //每页显示数据的终止数
boolean hasNextPage=false; //是否有下一页
boolean hasPreviousPage=false; //是否有前一页
ArrayList arrayList;
Iterator it;
public PageBean(){}
public int totalPages=0; //总页数
int pageRecorders=5;//每页5条数据
int totalRows=0; //总数据数
int pageStartRow=0;//每页的起始数
int pageEndRow=0; //每页显示数据的终止数
boolean hasNextPage=false; //是否有下一页
boolean hasPreviousPage=false; //是否有前一页
ArrayList arrayList;
Iterator it;
public PageBean(){}
public PageBean(ArrayList arrayList){
this.arrayList=arrayList;
totalRows=arrayList.size();
it=arrayList.iterator();
hasPreviousPage=false;
currentPage=1;
if((totalRows%pageRecorders)==0)
{
totalPages=totalRows/pageRecorders;
}
else
{
totalPages=totalRows/pageRecorders+1;
}
this.arrayList=arrayList;
totalRows=arrayList.size();
it=arrayList.iterator();
hasPreviousPage=false;
currentPage=1;
if((totalRows%pageRecorders)==0)
{
totalPages=totalRows/pageRecorders;
}
else
{
totalPages=totalRows/pageRecorders+1;
}
if(currentPage>=totalPages)
{
hasNextPage=false;
}
else
{
hasNextPage=true;
}
{
hasNextPage=false;
}
else
{
hasNextPage=true;
}
if(totalRows<pageRecorders)
{
this.pageStartRow=0;
this.pageEndRow=totalRows;
}
else
{
this.pageStartRow=0;
this.pageEndRow=pageRecorders;
}
}
public Book[] getNextPage(){
currentPage=currentPage+1;
System.out.println("PageBean.getNextPage()正在执行；");
System.out.println("参数currentPage="+currentPage);
System.out.println("PageBean.getNextPage()正在执行；");
System.out.println("参数currentPage="+currentPage);
if((currentPage-1)>0)
{
hasPreviousPage=true;
}
else
{
hasPreviousPage=false;
}
{
hasPreviousPage=true;
}
else
{
hasPreviousPage=false;
}
if(currentPage>=totalPages)
{
hasNextPage=false;
}
else
{
hasNextPage=true;
}
System.out.println("参数hasNextPage="+hasNextPage);
System.out.println("准备执行PageBean.getBooks()");
Book[] books=getBooks();
this.description();
{
hasNextPage=false;
}
else
{
hasNextPage=true;
}
System.out.println("参数hasNextPage="+hasNextPage);
System.out.println("准备执行PageBean.getBooks()");
Book[] books=getBooks();
this.description();
return books;
}
}
public Book[] getPreviouspage(){
currentPage=currentPage-1;
if(currentPage==0){currentPage=1;}
if(currentPage>=totalPages)
{
hasNextPage=false;
}
else
{
hasNextPage=true;
}
if((currentPage-1)>0)
{
hasPreviousPage=true;
}
else
{
hasPreviousPage=false;
}
Book[] books=getBooks();
this.description();
return books;
}
{
hasNextPage=false;
}
else
{
hasNextPage=true;
}
if((currentPage-1)>0)
{
hasPreviousPage=true;
}
else
{
hasPreviousPage=false;
}
Book[] books=getBooks();
this.description();
return books;
}
public Book[] getBooks(){
System.out.println("pageBean.getBooks（）开始执行；");
if(currentPage*pageRecorders<totalRows){//判断是否为最后一页
pageEndRow=currentPage*pageRecorders;
pageStartRow=pageEndRow-pageRecorders;
}
else{
pageEndRow=totalRows;
pageStartRow=pageRecorders*(totalPages-1);
}
Book[] books=new Book[pageEndRow-pageStartRow+1];
System.out.println("pageStartRow="+pageStartRow);
System.out.println("pageEndRow="+pageEndRow);
int j=0;
for(int i=pageStartRow;i<pageEndRow;i++)
{
System.out.println("pageEndRow="+pageEndRow);
int j=0;
for(int i=pageStartRow;i<pageEndRow;i++)
{
Book book=(Book)arrayList.get(i);
books[j++]=book;
books[j++]=book;
}
System.out.println("要显示的页面数据已经封装,具体信息如下：");
this.description();
return books;
}
System.out.println("要显示的页面数据已经封装,具体信息如下：");
this.description();
return books;
}
public String toString(int temp)
{
String str=Integer.toString(temp);
return str;
}
public void description()
{
{
String description="共有数据数:"+this.getTotalRows()+
"共有页数: "+this.getTotalPages() +
"当前页数为:"+this.getCurrentPage()+
" 是否有前一页: "+this.isHasPreviousPage() +
" 是否有下一页:"+this.isHasNextPage()+
" 开始行数:"+this.getPageStartRow()+
" 终止行数:"+this.getPageEndRow();
System.out.println(description);
}
}
}
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3 PageListAction.java
package page;
import org.apache.struts.action.*;
import javax.servlet.http.*;
import comm.Constants;
package page;
import org.apache.struts.action.*;
import javax.servlet.http.*;
import comm.Constants;
import bean.Book;
import java.util.*;
import javax.sql.DataSource;
/**
* Struts分页显示Action
*/
public class PageListAction extends Action {
import java.util.*;
import javax.sql.DataSource;
/**
* Struts分页显示Action
*/
public class PageListAction extends Action {
public PageListAction(){}
ArrayList arrayList=new ArrayList();
PageBean pb;
ArrayList arrayList=new ArrayList();
PageBean pb;
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
String action;
action=request.getParameter("action");
if(action==null || action.equals("null")){ //第一次读取数据
try{
DataSource datasource=this.getDataSource(request,Constants.DATASOURCE_KEY);
arrayList=Book.getAllBook(datasource.getConnection());
System.out.println("第一步，数据已经成功传递到Action，action="+action);
}catch(Exception e){
e.printStackTrace();
System.out.println("数据库连接出现异常");
}
String action;
action=request.getParameter("action");
if(action==null || action.equals("null")){ //第一次读取数据
try{
DataSource datasource=this.getDataSource(request,Constants.DATASOURCE_KEY);
arrayList=Book.getAllBook(datasource.getConnection());
System.out.println("第一步，数据已经成功传递到Action，action="+action);
}catch(Exception e){
e.printStackTrace();
System.out.println("数据库连接出现异常");
}
pb=new PageBean(arrayList);
Book[] books=pb.getBooks();
pb.description();
request.setAttribute("result",books);
request.setAttribute("page",pb);
Book[] books=pb.getBooks();
pb.description();
request.setAttribute("result",books);
request.setAttribute("page",pb);
}
else
{
if(action=="nextPage" || action.equals("nextPage"))
{
System.out.println("参数action="+action);
System.out.println("函数pb.getNextPage()准备执行");
Book[]books=pb.getNextPage();
request.setAttribute("page",pb);
request.setAttribute("result",books);
}
if(action=="previousPage" || action.equals("previousPage"))
{
System.out.println("参数action="+action);
System.out.println("函数pb.getPreviouspage()准备执行");
Book[] books=pb.getPreviouspage();
request.setAttribute("page",pb);
request.setAttribute("result",books);
else
{
if(action=="nextPage" || action.equals("nextPage"))
{
System.out.println("参数action="+action);
System.out.println("函数pb.getNextPage()准备执行");
Book[]books=pb.getNextPage();
request.setAttribute("page",pb);
request.setAttribute("result",books);
}
if(action=="previousPage" || action.equals("previousPage"))
{
System.out.println("参数action="+action);
System.out.println("函数pb.getPreviouspage()准备执行");
Book[] books=pb.getPreviouspage();
request.setAttribute("page",pb);
request.setAttribute("result",books);
}
}
return (mapping.findForward("success"));
}
}
}
return (mapping.findForward("success"));
}
}
4 pagetest.jsp
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ page contentType="text/html; charset=gb2312" language="java"%>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ page contentType="text/html; charset=gb2312" language="java"%>
<html:html locale="true">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<table border="1">
<tr><th>书名</th><th>作者</th><th>价格</th></tr>
<logic:present name="result">
<logic:iterate id="book" name="result" type="bean.Book" >
<logic:present name="book">
<tr>
<td><bean:write name="book" property="bookname" /></td>
<td> <bean:write name="book" property="author" /></td>
<td><bean:write name="book" property="price" /></td>
</tr>
</logic:present>
</logic:iterate>
</logic:present>
</table>
<logic:equal name="page" property="hasNextPage" value="true">
<html:link page="/page.do?action=nextPage">nextPage</html:link>
</logic:equal>
<logic:equal name="page" property="hasPreviousPage" value="true">
<html:link page="/page.do?action=previousPage">PreviousPage</html:link>
</logic:equal>
共有数据总数<bean:write name="page" property="totalRows"/>;
共分<bean:write name="page" property="totalPages"/>页,当前是第
<bean:write name="page" property="currentPage"/>页
</body>
</html:html>
<tr><th>书名</th><th>作者</th><th>价格</th></tr>
<logic:present name="result">
<logic:iterate id="book" name="result" type="bean.Book" >
<logic:present name="book">
<tr>
<td><bean:write name="book" property="bookname" /></td>
<td> <bean:write name="book" property="author" /></td>
<td><bean:write name="book" property="price" /></td>
</tr>
</logic:present>
</logic:iterate>
</logic:present>
</table>
<logic:equal name="page" property="hasNextPage" value="true">
<html:link page="/page.do?action=nextPage">nextPage</html:link>
</logic:equal>
<logic:equal name="page" property="hasPreviousPage" value="true">
<html:link page="/page.do?action=previousPage">PreviousPage</html:link>
</logic:equal>
共有数据总数<bean:write name="page" property="totalRows"/>;
共分<bean:write name="page" property="totalPages"/>页,当前是第
<bean:write name="page" property="currentPage"/>页
</body>
</html:html>
5 struts-config.xml
<?xml version="1.0" encoding="ISO-8859-1" ?>
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.1//EN"
"[url]http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd[/url]">
"-//Apache Software Foundation//DTD Struts Configuration 1.1//EN"
"[url]http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd[/url]">
<struts-config>
<data-sources>
<data-source key="dataSource" type="org.apache.commons.dbcp.BasicDataSource">
<set-property property="driverClassName" value="com.microsoft.jdbc.sqlserver.SQLServerDriver"/>
<set-property property="url" value="jdbc:microsoft:sqlserver://127.0.0.1:1433;DatabaseName=eBookStore;SelectMethod=cursor"/>
<set-property property="username" value="limq"/>
<set-property property="password" value="1"/>
<set-property property="maxActive" value="10"/>
<set-property property="maxWait" value="5000"/>
<set-property property="defaultAutoCommit" value="true"/>
<set-property property="defaultReadOnly" value="false"/>
</data-source>
</data-sources>
<form-beans>
</form-beans>
<global-forwards>
</global-forwards>
<action-mappings>
<action path="/page" type="page.PageListAction" scope="request">
<forward name="success" path="/pagetest.jsp"/>
</action>
</action-mappings>
<controller>
</controller>
</struts-config>
<data-sources>
<data-source key="dataSource" type="org.apache.commons.dbcp.BasicDataSource">
<set-property property="driverClassName" value="com.microsoft.jdbc.sqlserver.SQLServerDriver"/>
<set-property property="url" value="jdbc:microsoft:sqlserver://127.0.0.1:1433;DatabaseName=eBookStore;SelectMethod=cursor"/>
<set-property property="username" value="limq"/>
<set-property property="password" value="1"/>
<set-property property="maxActive" value="10"/>
<set-property property="maxWait" value="5000"/>
<set-property property="defaultAutoCommit" value="true"/>
<set-property property="defaultReadOnly" value="false"/>
</data-source>
</data-sources>
<form-beans>
</form-beans>
<global-forwards>
</global-forwards>
<action-mappings>
<action path="/page" type="page.PageListAction" scope="request">
<forward name="success" path="/pagetest.jsp"/>
</action>
</action-mappings>
<controller>
</controller>
</struts-config>
6 建立eBookStore数据库，以及表book（name,author,parce）;其中数据的配置可以根据你的不同情况在struts-config.xml中而定。
7 Constants.java
package comm;
/**
* this interface provides the constant string for applicator constant
*/
public class Constants {
/**
* name of the User Object in HttpSession
*/
public static String USER_KEY="user";
/**
* dataSource name
*/
public static String DATASOURCE_KEY="dataSource";
}
* this interface provides the constant string for applicator constant
*/
public class Constants {
/**
* name of the User Object in HttpSession
*/
public static String USER_KEY="user";
/**
* dataSource name
*/
public static String DATASOURCE_KEY="dataSource";
}
