我的Ҏ(gu)是，Ҏ(gu)用户点击D条上的页?offset)Q到DB中读取该늚数据(不是一ơ全部读?Q点到哪读哪页的数据，JBX + tomcat + oracle下测试通过Q数据库用的表是oracle的emp表?/p>
********分页cPager.javaQ负责生成分导航条********
package page;
/**
* 分页代码
* <p>Title: 分页</p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2005</p>
* <p>Company: BCS</p>
* @author Alex
* @version 1.0
*/
public class Pager {
private int offset;
private int size;
private int length;
private String url;
private String pageHeader;
public Pager(int offset, int size, int length, String url, String pageHeader) {
this.offset = offset;
this.size = size;
this.length = length;
this.url = url;
this.pageHeader = pageHeader;
}
/**
* q回分页D?br> * @param offset int 起始记录的位|?br> * @param size int 总记录数
* @param length int 步长
* @param url String .do的url
* @param pageHeader String D条的前缀文字提示
* @return String
*/
public String getPageNavigation() {
String pageNavigation = ""; //最l返回的分页D?br> //记录数超q一?需要分?br> if (size > length) {
String pref; //前缀
if (url.indexOf("?") > -1) {
//如果url中已l包含了(jin)其他的参?把offset参数接在后面
pref = "&";
}
else {
//如果url中没有别的参?br> pref = "?";
}
//如果D条包含header
if (pageHeader != null && pageHeader.length() > 0) {
pageNavigation = pageHeader + " : ";
}
//如果不是W一?D条将包含“<<”(W一??#8220;<”(前一?
if (offset > 0) {
pageNavigation += "<a href='" + url + pref + "offset=0'>[<<]</a>\n" +
"<a href='" + url + pref + "offset=" + (offset - length) +
"'>[<]</a>\n";
}
//D条中,排头的那一늚offset?br> int startOffset;
//位于D条中间的那一늚offset?半径)
int radius = constants.MAX_PAGE_INDEX / 2 * length;
//如果当前的offset值小于半?br> if (offset < radius || this.pageCount() <= constants.MAX_PAGE_INDEX) {
//那么W一|?br> startOffset = 0;
}
else if (offset < size - radius) {
startOffset = offset - radius;
}
else {
startOffset = (size / length - constants.MAX_PAGE_INDEX) * length;
}
for (int i = startOffset;
i < size && i < startOffset + constants.MAX_PAGE_INDEX * length;
i += length) {
if (i == offset) {
//当前号,加粗昄
pageNavigation += "<b>" + (i / length + 1) + "</b>\n";
}
else {
//其他号,包含链?br> pageNavigation += "<a href='" + url + pref + "offset=" + i + "'>" +
(i / length + 1) + "</a>\n";
}
}
//如果不是最后一?D条将包含“>”(下一??#8220;>>”(最后一?
if (offset < size - length) {
pageNavigation += "<a href='" + url + pref + "offset=" +
(offset + length) + "'>[>]</a>\n" +
"<a href='" + url + pref + "offset=" + lastPageOffset() +
"'>[>>]</a>\n";
}
// System.out.println("radius : " + radius);
// System.out.println("start offset : " + startOffset);
return pageNavigation;
}
//记录不超q一?不需要分?br> else {
return "";
}
}
/**
* q回分页后的总页?br> * @param size int 总记录数
* @param length int 每页的记录数
* @return int
*/
public int pageCount() {
int pagecount = 0;
if (size % length == 0) {
pagecount = size / length;
}
else {
pagecount = size / length + 1;
}
return pagecount;
}
/**
* q回最后一늚记录?br> * @param size int 总记录数
* @param length int 每页的记录数
* @return int
*/
public int lastPageSize() {
int lastpagesize = 0;
if (size % length == 0) {
lastpagesize = length;
}
else {
lastpagesize = size % length;
}
return lastpagesize;
}
/**
* q回最后一늚起始记录位置
* @param size int 总记录数
* @param length int 每页的记录数
* @return int
*/
public int lastPageOffset() {
return size - lastPageSize();
}
public int getOffset() {
return offset;
}
public void setOffset(int offset) {
this.offset = offset;
}
public int getSize() {
return size;
}
public void setSize(int size) {
this.size = size;
}
public int getLength() {
return length;
}
public void setLength(int length) {
this.length = length;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getPageHeader() {
return pageHeader;
}
public void setPageHeader(String pageHeader) {
this.pageHeader = pageHeader;
}
}
********数据处理cempDAO.javaQ负责访问DBQ获取当前页面需要显C的记录********
package page;
import java.sql.*;
import java.util.*;
public class empDAO {
public empDAO() {
}
/**
* 从offset位置起始,q回length条记?br> * @param offset int 起始的记录位|?br> * @param length int 步长
* @param conn Connection 数据库连?br> * @return ArrayList
*/
public ArrayList findAllEmp(int offset, int length, Connection conn) throws
SQLException {
PreparedStatement ps = null;
ResultSet rs = null;
ArrayList emps = new ArrayList();
empVO empvo = null;
String strSql = "select empno, ename from emp where rowid not in (select rowid from emp where rownum <= ?) and rownum <= ?";
try {
ps = conn.prepareStatement(strSql);
ps.setInt(1, offset); //起始记录的位|?br> ps.setInt(2, length); //步长
rs = ps.executeQuery();
while (rs != null && rs.next()) {
empvo = new empVO();
empvo.setEmpno(rs.getInt("empno"));
empvo.setEname(rs.getString("ename"));
emps.add(empvo);
}
}
catch (SQLException ex) {
ex.printStackTrace();
throw ex;
}
return emps;
}
/**
* q回ȝ记录?br> * @param conn Connection
* @throws SQLException
* @return int
*/
public int getRsTotalCount(Connection conn) throws SQLException {
PreparedStatement ps = null;
ResultSet rs = null;
int rsCount = 0;
String strSql = "select count(empno) as empCount from emp";
try {
ps = conn.prepareStatement(strSql);
rs = ps.executeQuery();
if (rs != null && rs.next()) {
rsCount = rs.getInt("empCount");
}
}
catch (SQLException ex) {
ex.printStackTrace();
throw ex;
}
return rsCount;
}
}
********业务cempBO.javaQ调用empDAOc?*******
package page;
import java.util.*;
/**
* BOc?br> * <p>Title: 分页</p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2005</p>
* <p>Company: BCS</p>
* @author Alex
* @version 1.0
*/
public class empBO {
private DBPool db = DBPool.newInstance();
private empDAO empdao = new empDAO();
public empBO() {
}
/**
* 从offset位置起始,q回length条记?br> * @param offset int 起始
* @param length int 步长
* @throws Exception
* @return ArrayList
*/
public ArrayList findAllEmp(int offset, int length) throws Exception {
ArrayList emps = new ArrayList();
try {
emps = empdao.findAllEmp(offset, length, db.getConnection());
}
catch (Exception ex) {
throw ex;
}
finally {
db.release();
}
return emps;
}
/**
* q回ȝ记录?br> * @throws Exception
* @return int
*/
public int getRsTotalCount() throws Exception {
int rsCount = 0;
try {
rsCount = empdao.getRsTotalCount(db.getConnection());
}
catch (Exception ex) {
throw ex;
}
finally {
db.release();
}
return rsCount;
}
}
********ActionFormcempForm.java********
package page;
import javax.servlet.http.*;
import org.apache.struts.action.*;
public class empForm
extends ActionForm {
private int offset; //起始记录的位|?/每页昄的记录数
public ActionErrors validate(ActionMapping actionMapping,
HttpServletRequest httpServletRequest) {
/**@todo: finish this method, this is just the skeleton.*/
return null;
}
public void reset(ActionMapping actionMapping,
HttpServletRequest httpServletRequest) {
this.offset = 0; //记录默认从第一条开始显C?br> }
public int getOffset() {
return offset;
}
public void setOffset(int offset) {
this.offset = offset;
}
}
********ActioncempAction.javaQ控制器Q调用BOc，Pagerc?*******
package page;
import java.util.*;
import javax.servlet.http.*;
import org.apache.struts.action.*;
/**
* 分页试的Action
* <p>Title: 分页</p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2005</p>
* <p>Company: BCS</p>
* @author Alex
* @version 1.0
*/
public class empAction
extends Action {
public ActionForward execute(ActionMapping actionMapping,
ActionForm actionForm,
HttpServletRequest httpServletRequest,
HttpServletResponse httpServletResponse) {
empForm empform = (empForm) actionForm;
return performList(actionMapping, actionForm, httpServletRequest,
httpServletResponse);
}
private ActionForward performList(ActionMapping actionMapping,
ActionForm actionForm,
HttpServletRequest request,
HttpServletResponse response) {
try {
empBO empbo = new empBO();
//获取外部传进来的起始记录?br> int offset = ( (empForm) actionForm).getOffset();
//获取每页的记录数
int pagesize = constants.PAGE_SIZE;
//获取记录集合,从offset开?取length条记?br> ArrayList emps = empbo.findAllEmp(offset, pagesize);
//计算所有记录的条数(总记录数)
int size = empbo.getRsTotalCount();
//外部url地址,得到形如: http://localhost:8088/bugMIS/showlist.do 的String
String url = request.getContextPath() + actionMapping.getPath() + ".do";
//实例化分늱
Pager p = new Pager(offset, size, pagesize, url, "Page Navigation");
//获取分页D?br> //String pageNavigation = p.getPageNavigation();
//url字符串和记录集合,存入request?br> request.setAttribute("pager", p);
request.setAttribute("emps", emps);
}
catch (Exception e) {
e.printStackTrace();
return actionMapping.findForward("failure");
}
return actionMapping.findForward("success");
}
}
********数据库连接池cDBPool.javaQ可以用tomcat的连接池Q也可以不用Q这里关闭了(jin)********
package page;
import java.sql.*;
import javax.naming.*;
import javax.sql.*;
import org.apache.commons.logging.*;
/**
* pȝq接池类
* <p>Title:
Gantoo@91.com</p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2005</p>
* <p>Company: BCS</p>
* @author Alex
* @version 1.0
*/
public class DBPool {
Log log = LogFactory.getLog("DBPool"); //日志?br> private DBPool() {
}
private Connection conn = null;
/* true:使用q接?br> false:不用连接池,采用JDBC直接q接 */
private final static boolean USE_DB_POOL = false;
private final static String jndi_DataSource = "jdbc/BugMIS_ora";
private final static String jdbcdriver =
"oracle.jdbc.driver.OracleDriver";
private final static String url =
"jdbc:oracle:thin:@localhost:1521:myo9";
private final static String user = "scott";
private final static String pass = "tiger";
public static DBPool newInstance() {
return new DBPool();
}
/**
* 切换是否使用q接?br> * */
public Connection getConnection() {
if (USE_DB_POOL) {
conn = getConnectionByDBPool();
}
else {
conn = getConnectionDirect();
}
return conn;
}
/**
* 直接采用JDBCq接数据?br> * */
private Connection getConnectionDirect() {
try {
Class.forName(jdbcdriver).newInstance();
conn = DriverManager.getConnection(url, user, pass);
}
catch (SQLException ex) {
log.error("Error Connection! " + ex.getMessage());
}
catch (ClassNotFoundException ex) {
log.error("Driver Not Found! " + ex.getMessage());
}
catch (IllegalAccessException ex) {
log.error(ex.getMessage());
}
catch (InstantiationException ex) {
log.error(ex.getMessage());
}
return conn;
}
/**
* 采用q接?br> * */
private Connection getConnectionByDBPool() {
try {
Context initCtx = new InitialContext();
Context ctx = (Context) initCtx.lookup("java:/comp/env");
DataSource ds = (DataSource) ctx.lookup(jndi_DataSource);
conn = ds.getConnection();
}
catch (NamingException ex) {
log.error("Data Source Not Found! " + ex.getMessage());
//System.out.println("未找到数据源" + ex.getMessage());
}
catch (SQLException ex1) {
log.error("Error Connection! " + ex1.getMessage());
//System.out.println("错误的数据连? + ex1.getMessage());
}
return conn;
}
/**
* 释放q接
* */
public void release() {
try {
if (!conn.isClosed()) {
conn.close();
}
}
catch (SQLException ex) {
log.error("Connection Closing Error! " + ex.getMessage());
//System.out.println("q接关闭p|" + ex.getMessage());
}
}
}
********包含帔R的类constants.javaQ常?*******
package page;
/**
* 定义工程中公用的帔R
* <p>Title: 分页</p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2005</p>
* <p>Company: BCS</p>
* @author Alex
* @version 1.0
*/
public final class constants {
public static final int MAX_PAGE_INDEX = 5; //脚昄多少?br> public static final int PAGE_SIZE = 2; //每页的记录数
}
********试jsp面index.jspQؓ(f)?jin)方便测试，嵌入了(jin)java代码Q能昄p********
<%@ 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=GBK" import="java.util.*,page.*"%>
<html:html>
<head>
<title></title>
<style type="text/css">
.pt9 { font: 10pt "宋体"}
body { font: 10pt "宋体" ; margin: 15px}
td { font-size: 10pt}
a:hover { font-size: 10pt; color: red; text-decoration: underline}
a:link { font-size: 10pt; color: blue; text-decoration: underline}
a:active { font-size: 10pt; color: blue; text-decoration: underline}
a:visited { font-size: 10pt; color: blue; text-decoration: underline }
</style>
</head>
<body bgcolor="#ffffff">
<p><a href="http://localhost:8088/page/showEmp.do?offset=0">Show Me All Of The Emps</a></p>
<logic:present name="emps">
<%
ArrayList emps = (ArrayList)request.getAttribute("emps");
Iterator it = emps.iterator();
empVO empvo;
while(it!=null && it.hasNext()){
empvo = (empVO)it.next();
out.print(empvo.getEmpno() + " ");
out.print(empvo.getEname() + "<br>");
}
out.print("当前| " + emps.size() + " 条记?lt;br>");
out.print("<p>");
%>
</logic:present>
<logic:present name="pager">
<%
Pager pager = (Pager)request.getAttribute("pager");
out.print(pager.getPageNavigation() + "<p>");
out.print("共有记录 " + pager.getSize() + " ?lt;br>");
out.print("每页?" + pager.getLength() + " 条记?lt;br>");
out.print("共分 " + pager.pageCount() + " ?lt;br>");
%>
</logic:present>
</body>
</html:html>
********配置文gstruts-config.xml********
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "<struts-config>
<form-beans>
<form-bean name="empForm" type="page.empForm" />
</form-beans>
<action-mappings>
<action input="/index.jsp" name="empForm" path="/showEmp" scope="request" type="page.empAction" validate="false">
<forward name="faiure" path="/index.jsp" />
<forward name="success" path="/index.jsp" />
</action>
</action-mappings>
</struts-config>
在网上看?jin)几个Structs分页Q感觉不是很完善Q于是根据自ql验Q写?jin)一个相寚w效简z的分页Ҏ(gu)。由于本人水qx限，如果大家有什么更好的xQ欢q不吝赐教?br>
一?开发环?br>
我的开发环境是QJBuilder x + Weblogic 8.1 + Oracle 9i + Windows 2003 Q如果朋友们的开发环境不一样亦无妨?br>
二、开发思\
既然讲的是StrutsQ那自然M?jin)MVCQ分|CZ是如此?br>
1?建立数据库和对应的表Q本例的表是TCertificate?br>
2?建立适当的模型组Ӟ对应你要查询数据库中的表。这部分由DAO数据讉K层来实现Q如果有的朋友对DAO不熟(zhn)可以查询一下相兌料。本例由CertificateDAO.java来实现?br>
3 、徏立分|需要的模型lgQ由javaBean来充当，q与CertificateDAO实现分离。网上介l的很多Ҏ(gu)Q都存在着数据与分늻件藕合的现象Q这也是本方法与其它分页Ҏ(gu)的主要不同之处?br>
4、徏立控制器lgQ这部分由Struts 中的Action来实现。主要负责将实例化CertificateDAOQ只取要昄的数据记录，存入ArrayList对象然后q回Qƈ攑ֈrequest中。而分部分则Ҏ(gu)分页条gQ单独进行构造，避免?jin)与DAO混在一L(fng)情况发生。网上其它介l的一些分|法中Q基本上都是一ơ性读出所有查询的数据Q然后再由分늛关组件进行构造。这P如果数据量大的话Q很Ҏ(gu)形成瓉。在本例中由于不是一ơ性地d查询的所有数据，而只是读Z个页面要昄的数据记录，q就节省?jin)很多不必要的数据传输，提高了(jin)效率。本例中为CertificateAction.java?br>
5、徏立视囄Ӟq部分由jsp来充当，Z(jin)不出现java 代码Q我们用Struts提供的标{ֺQ主要负责从request中取出刚刚放入的对象Q通过反复调用CertificateAction以及(qing)action参数Q而实现分|C。本例中为listcertificate.jsp?br>
6?建立q|struts-config.xml?br>
三、实例代?br>
定好上面的开发思\后，代码的实现就有单可@?jin)?br>
1、徏数据库和相应的表?br>
2、数据逻辑层的相关代码?br>
1Q、通用的DAOc：(x)CommonDAO.java
q是一个很多DAO都要l承到的通用DAOc，是我Ҏ(gu)实践ȝ出来的，Z(jin)减少幅Q这里只昄和本例相关的代码?br>
java代码:
代码Q?br> --------------------------------------------------------------------------------
package com.xindeco.business ;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.sql.*;
import java.lang.IllegalAccessException;
import java.lang.reflect.InvocationTargetException;
import org.apache.commons.beanutils.BeanUtils;
public class DAO
{
protected DataSource ds;
/**
* 说明:取得当前查询的总记录数
*/
public int getRows ()
{
return this.count;
}
public void rsHandler (ResultSet rs, int offset, int limit)
{
try
{
count = 0;
rs.absolute ( -1) ;
count = rs.getRow () ;
if (offset <= 0)
{
rs.beforeFirst () ;
}
else
{
rs.absolute (offset) ;
}
}
catch (Exception e)
{
e.printStackTrace () ;
}
}
public DAO(DataSource ds) {
this.ds = ds;
}
public void setDataSource(DataSource ds) {
this.ds = ds;
}
protected void close(ResultSet rs) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
}
rs = null;
}
}
protected void close(PreparedStatement pstmt) {
if (pstmt != null) {
try {
pstmt.close();
} catch (SQLException e) {
}
pstmt = null;
}
}
protected void close(Connection conn) {
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
conn = null;
}
}
protected void rollback(Connection conn) {
if (conn != null) {
try {
conn.rollback();
} catch (SQLException e) {
e.printStackTrace();
}
conn = null;
}
}
}
q个cM要是通过子类传进来的先进l果集，取得查询的记录LQƈҎ(gu)据库q接q行单的理?br>
2Q、对数据库进行访问：(x)CertificateDAO.java
java代码:
代码Q?br> --------------------------------------------------------------------------------
package com.xindeco.business;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.sql.*;
import com.xindeco.common.dbconn.DbConn;
public class CertificateDAO extends DAO
{
public NationDAO(DataSource ds) {
super(ds);
}
public List findCertificateList(int offset,int limit) throws SQLException
{
int countRows = 0 ;
ArrayList list = null ;
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try
{
conn = ds.getConnection();
String sql =
"SELECT certificateID, certificateCode,certificateName,photoURL,"
+ "description,graduateID FROM TCertificate " ;
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
/*Ҏ(gu)标进行处理，rsHandler Ҏ(gu)在父cDAO?/
this.rsHandler(rs,offset,limit);
if (rs != null && rs.next ())
{
list = new ArrayList () ;
do
{
countRows++ ;
list.add (rs2VO (rs)) ;
}
while ( (countRows++ < limit) && rs.next ()) ;
}
close(rs);
close(pstmt);
} catch (SQLException e) {
close(rs);
close(pstmt);
rollback(conn);
e.printStackTrace();
}
finally {
close(conn);
}
return list ;
}
private CertificateVO rs2VO (ResultSet rs)
{
try
{
CertificateVO certificateVO = new CertificateVO () ;
certificateVO.setCertificateID (rs.getInt ("certificateID")) ;
certificateVO.setCertificateCode (rs.getString ("certificateCode")) ;
certificateVO.setCertificateName (rs.getString ("certificateName")) ;
certificateVO.setPhotoURL (rs.getString ("photoURL")) ;
certificateVO.setDescription (rs.getString ("description")) ;
certificateVO.setGraduateID (rs.getInt ("graduateID")) ;
return certificateVO ;
}
catch (Exception ex)
{
ex.printStackTrace () ;
return null ;
}
}
}
findCertificateList(int offset,int limit)是查得所有要昄的数据，q放入ArrayList中。看q网上有些例子，把数据记录放入ArrayList的动作过E直接在while循环体里完成Q如果字D多的话Q会(x)造成Ҏ(gu)q于宠大Q又不美观?q里Q数据记录放入ArrayList的动作过E由rs2VOҎ(gu)完成Q就比较整洁?jin)。另外，if (rs != null && rs.next ()) 配合while ( (countRows++ < limit) && rs.next ()) 是ؓ(f)?jin)程序的健壮性考虑的，E分析一下不隑־出结论?br>
3、徏立控制器lgQCertificateAction.java
java代码:
代码Q?br> --------------------------------------------------------------------------------
package com.xindeco.presentation;
import javax.sql.* ;
import java.util.* ;
import javax.servlet.http.* ;
import javax.servlet.* ;
import org.apache.struts.action.* ;
import org.apache.struts.util.* ;
import com.xindeco.common.Pager;
import com.xindeco.business.graduatedata.CertificateDAO ;
public class CertificateAction
extends Action
{
private static final int PAGE_LENGTH = 5 ; //每页昄5条记?br> public ActionForward execute (ActionMapping mapping, Actionform form,
HttpServletRequest request,
HttpServletResponse response)
{
ActionForward myforward = null ;
String myaction = mapping.getParameter () ;
if (isCancelled (request))
{
return mapping.findForward ("failure") ;
}
if ("".equalsIgnoreCase (myaction))
{
myforward = mapping.findForward ("failure") ;
}
else if ("LIST".equalsIgnoreCase (myaction))
{
myforward = performList (mapping, form, request, response) ;
}
else
{
myforward = mapping.findForward ("failure") ;
}
return myforward ;
}
private ActionForward performList (ActionMapping mapping,
Actionform actionform,
HttpServletRequest request,
HttpServletResponse response)
{
try
{
DataSource ds = (DataSource) servlet.getServletContext().getAttribute(Action.DATA_SOURCE_KEY);
CertificateDAO certificateDAO = new CertificateDAO (ds) ;
int offset = 0; //页时的起始记录所在游?br> int length = PAGE_LENGTH;
String pageOffset = request.getParameter("pager.offset");
if (pageOffset == null || pageOffset.equals("")) {
offset = 0;
} else {
offset = Integer.parseInt(pageOffset);
}
List certificateList = certificateDAO .findCertificateList (offset,length) ;
int size = certificateDAO.getRows(); // 取得总记录数
String url = request.getContextPath()+"/"+mapping.getPath()+".do";
String pagerHeader = Pager.generate(offset, size, length, url); //分页处理
request.setAttribute ("pager", pagerHeader) ;
request.setAttribute ("list", certificateList) ;
}
catch (Exception e)
{
e.printStackTrace();
return mapping.findForward ("error") ;
}
return mapping.findForward ("success") ;
}
}
CertificateAction.java主要是把数据从DAO中取出，q放入一个ArrayList 中，然后通过配置文g再Y件View的JSPc(din)?br>
5、徏立视图listcertificate.jsp文g?br>
jsp代码:
代码Q?br> --------------------------------------------------------------------------------
<%@ page contentType="text/html; charset=GBK" %>
<%@ taglib uri="/WEB-INF/struts-template.tld" prefix="template" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<table bgcolor="#666666" cellpadding="1" cellspacing="0" border="0" width="500">
<tr>
<td>
<table cellpadding="0" cellspacing="0" border="0" width="500">
<tr>
<td bgcolor="#fecc51">&</td>
</tr>
</table>
</td>
</tr>
<tr>
<td>
<table cellpadding="0" cellspacing="0" border="0" width="500">
<tr>
<td bgcolor="#d6e0ed">
&&<bean:message key="label.list4certificate"/>
</td>
</tr>
<tr bgcolor="#FFFFFF">
<td width="5%"></td><td width="19%"></td><td width="76%"></td>
</tr>
<tr>
<td>
<table bgcolor="#f2f2f2" width="500" cellspacing="0" border="0">
<tr bgcolor="#bacce1">
<td><b><bean:message key="Certificate.select"/> </b></td>
<td><b><bean:message key="Certificate.certificateID"/> </b></td>
<td><b><bean:message key="Certificate.certificateCode"/></b></td>
<td><b><bean:message key="Certificate.certificateName"/></b></td>
<td><b><bean:message key="Certificate.view"/></b></td>
</tr>
<bean:write name="pager" property="description"/>
<logic:equal name="pager" property="hasPrevious" value="true">
<a href="/graduatedata/list.do?viewPage=<bean:write name="pager" property="previousPage"/>" class="a02">
Previous
</a>
</logic:equal>
<logic:equal name="pager" property="hasNext" value="true">
<a href="/graduatedata/list.do?viewPage=<bean:write name="pager" property="nextPage"/>" class="a02">
Next
</a>
</logic:equal>
<logic:notEmpty name="list" scope="request">
<logic:iterate id="certificate" name="list" type="com.xindeco.business.graduatedata.CertificateVO"scope="request">
<tr bgcolor="#FFFFFF">
<td><html:text property="name" value="<bean:write name="certificate" property="certificateID" scope="page"/>"/>
</td>
<td> <bean:write name="certificate" property="certificateID" scope="page"/></td>
<td> <bean:write name="certificate" property="certificateCode" scope="page"/></td>
<td> <bean:write name="certificate" property="certificateName" scope="page"/></td>
<td> <bean:write name="certificate" property="photoURL" scope="page"/></td>
</tr>
</logic:iterate>
</logic:notEmpty>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
6、对应的配置文gstruts-config.xml?br>
java代码:
代码Q?br> --------------------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" " <struts-config>
<form-beans>
<form-bean name="certificateform" type="com.xindeco.presentation.graduatedata.Certificateform" />
</form-beans>
<global-forwards>
<forward name="error" path="/error/error.jsp" />
</global-forwards>
<action-mappings>
<action name="certificateform" parameter="LIST" path="/graduatedata/list" scope="request" type="com.xindeco.presentation.graduatedata.CertificateAction" validate="true">
<forward name="success" path="/graduatedata/listcertificate.jsp" />
</action>
</action-mappings>
……
</struts-config>
7、最后当然是最重要的分代码了(jin)QPager.java
java代码:
代码Q?br> --------------------------------------------------------------------------------
package com.xindeco.common;
import java.util.* ;
public class Pager {
private static int MAX_PAGE_INDEX = 10; //脚昄多少?br> private static String HEADER = "Result page";
public static String generate(int offset, int length, int size, String url) {
if (length > size) {
String pref;
if (url.indexOf("?") > -1) {
pref = "&";
} else {
pref = "?";
}
String header = "<font face='Helvetica' size='-1'>"+HEADER+": ";
if (offset > 0) {
header += "&<a href=\""+url+pref+"pager.offset="+(offset-size)+"\">[<< Prev]</a>\n";
}
int start;
int radius = MAX_PAGE_INDEX/2*size;
if (offset < radius) {
start = 0;
} else if(offset < length-radius) {
start = offset - radius;
} else {
start = (length/size-MAX_PAGE_INDEX)*size;
}
for(int i=start;i<length && i < start + MAX_PAGE_INDEX*size;i+=size) {
if (i == offset) {
header += "<b>"+(i/size+1)+"</b>\n";
} else {
header += "&<a href=\""+url+pref+"pager.offset="+i+"\">"+(i/size+1)+"</a>\n";
}
}
if(offset < length - size) {
header += "&<a href=\""+url+pref+"pager.offset="+((int)offset+(int)size)+"\">[Next >>]</a>\n";
}
header += "</font>";
return header;
} else {
return "";
}
}
}
q部分代码的实现相当z，但已l够完成所需?jin)?
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
String url="jdbc:oracle:thin:@localhost:1521:orcl";
//orcl为数据库的SID
String user="test";
String password="test";
Connection conn= DriverManager.getConnection(url,user,password);
2、DB2数据?
Class.forName("com.ibm.db2.jdbc.app.DB2Driver ").newInstance();
String url="jdbc:db2://localhost:5000/sample";
//sampleZ的数据库?
String user="admin";
String password="";
Connection conn= DriverManager.getConnection(url,user,password);
3、Sql Server7.0/2000数据?
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();
String url="jdbc:microsoft:sqlserver://localhost:1433;databasename=pubs";
//mydb为数据库
String user="sa";
String password="";
Connection conn= DriverManager.getConnection(url,user,password);
4、Sybase数据?
Class.forName("com.sybase.jdbc.SybDriver").newInstance();
String url =" jdbc:sybase:Tds:localhost:5007/myDB";
//myDBZ的数据库?
Properties sysProps = System.getProperties();
SysProps.put("user","userid");
SysProps.put("password","user_password");
Connection conn= DriverManager.getConnection(url, SysProps);
5、Informix数据?
Class.forName("com.informix.jdbc.IfxDriver").newInstance();
String url =
"jdbc:informix-sqli://123.45.67.89:1533/myDB:INFORMIXSERVER=myserver;
user=testuser;password=testpassword";
//myDB为数据库?
Connection conn= DriverManager.getConnection(url);
6、MySQL数据?
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
String url ="jdbc:mysql://localhost/myDB?user=soft&password=soft1234&useUnicode=true&characterEncoding=8859_1"
//myDB为数据库?
Connection conn= DriverManager.getConnection(url);
7、PostgreSQL数据?
Class.forName("org.postgresql.Driver").newInstance();
String url ="jdbc:postgresql://localhost/myDB"
//myDB为数据库?
String user="myuser";
String password="mypassword";
Connection conn= DriverManager.getConnection(url,user,password);
8、access数据?br>con = DriverManager.getConnection("jdbc:odbc:Driver={MicroSoft Access Driver (*.mdb)};DBQ=C:/data/Access/test1.mdb","dba","sql");