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java分页网页代码 java分页实现原理

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求java分页代码，急用！package common.util;
import java.util.*;
public class PageController implements IPageModel {
private Collection model;
//数据总行数
private int totalRowCount = 0; //
//总页数
private int pageCount = 0;
//每页应显示的行数
private int maxPageRowCount = 0;
//当前页行数
private int currPageRowCount = 0;
//当前页号
private int currPageNum;
//默认构造
public PageController() {
super();
}
//传入模型
public PageController(Collection model) {
setPageController(model);
}
//设一个分页模型
public void setPageController(Collection model) {
this.model = model;
this.totalRowCount = model.size();
}
/**
* 总页数
* @return int
*/
public int getPageCount() {
return this.pageCount;
}
/**
* getPageContents
*
* @param intPageNum int
* @return Object
*/
public Object getPageContents(int intPageNum) {
//非法数据
if(intPageNum1){
intPageNum=1;
}
if(intPageNumpageCount){
intPageNum=pageCount;
}
//指定当前页
this.currPageNum=intPageNum;
int i = 0;
ArrayList arr = new ArrayList();
//如果是合法的范围
if (intPageNum0intPageNum = pageCount) {
//计算该页的开始号和结束号
int lfromrow = (intPageNum - 1) * maxPageRowCount;
arr = (ArrayList) getElementsAt(model, lfromrow, lfromrowmaxPageRowCount-1);
}
currPageNum=intPageNum;
return arr;
}
public Object getLastPage() {
return this.getPageContents(pageCount);
}
public Object getFirstPage() {
return this.getPageContents(0);
}
/**
* getCurrentPageRowsCount
*
* @return int
*/
public int getCurrentPageRowsCount() {
if(currPageNumpageCount){
return maxPageRowCount;
}
else{//最后一页
return totalRowCount-(pageCount-1)*maxPageRowCount;
}
}
public int getCurrentPageNum(){
return currPageNum;
}
/**
* setMaxPageRows
*
* @return int
*/
public void setMaxPageRows(int rowCount) {
maxPageRowCount = rowCount;
//计算总页数
if (totalRowCount % maxPageRowCount0) { //有余数
pageCount = totalRowCount / maxPageRowCount1;
}
else {
pageCount = totalRowCount / maxPageRowCount;
}
}
/**
* getMaxPageRows
*/
public int getMaxPageRows() {
return maxPageRowCount;
}
//私有方法，返回集合中指定范围的数据
private Object getElementsAt(Collection model, int fromIndex, int toIndex) {
【java分页网页代码 java分页实现原理】Iterator iter = model.iterator();
ArrayList arr = new ArrayList();
if (iter != null) {
int i = 0;
while (iter.hasNext()) {
Object obj=iter.next();
if (i = fromIndexi = toIndex) {
arr.add(obj);
}
if (itoIndex) {
break;
}
i = i1;
}
}
return arr;
}
}
java中如何实现百度中的分页/**
* 分页代码
*
* @author Star
* @version 1.0 2008/07/08
*/
public class CutPage implements Serializable{
private static Log log = LogFactory.getLog(CutPage.class);
private int curPageNo = 0; // 当前页数，从0开始
private int size = 0; // 所有数据条数
private String url; // 页面跳转的路径
private List showList; // 当前页面需要显示的数据列表
private int pageSize = 20;// 每页显示的数据条数
private int groupSize = 1;// 多少页为一组
private String pageNavigation;// 导航条
/**
* 每次通过sql语句从数据库里面分组取出需要显示的数据
*
* @param request
*javax.servlet.http.HttpServletRequest对象
* @param sql
*String 查询数据库的sql语句
* @param pageSize
*int 每页显示的条数
* @param groupSize
*int 分成多少组
* @param url
*String 页面跳转的路径，若没有特殊的参数传递，可以传入null或""，
*如是在aciton里面调用 ， 并且action是继承自DispatherAction的话最好传入完整的路径
*/
public void init(HttpServletRequest request, String sql, int pageSize,
int groupSize, int pageNo, String url) {
// 上一页、下一页跳转路径
if (url != null) {
this.url = url;
} else {
this.url = request.getRequestURL()"";
}
if (pageSize0)
this.pageSize = pageSize;// 每页多少条记录
if (groupSize0)
this.groupSize = groupSize;
// 当前第几页
if (pageNo0) {
this.curPageNo = 0;
} else {
this.curPageNo = pageNo;
}
int curGroup = this.curPageNo / this.groupSize1;
// 是否是新的一组数据，如果是则到数据库取数据
this.size = parseInt(request.getSession().getAttribute("page_all_size")
"", 0);
if (this.curPageNo % this.groupSize == 0
|| (request.getSession().getAttribute("cur_group") != nullparseInt(
""request.getSession().getAttribute("cur_group"), 1) != curGroup)
|| this.size == 0 || request.getParameter("reload") != null) {
request.getSession().setAttribute("cur_group", curGroup);
if (pageNo0
request.getSession().getAttribute("page_sql") != null) {
sql = request.getSession().getAttribute("page_sql")"";
} else {
request.getSession().setAttribute("page_sql", sql);
}
this.size = getTotalCount(sql);
List list = getPageData(sql, (this.curPageNo / this.groupSize)
* this.pageSize * this.groupSize, this.pageSize
* this.groupSize);
request.getSession().setAttribute("page_all_size", this.size);
request.getSession().setAttribute("page_cur_list", list);
this.setShowList(list);// 设置页面上的显示数据
} else {
this.setShowList((List) request.getSession().getAttribute(
"page_cur_list"));// 设置页面上的显示数据
}
}
/**
* 每次通过sql语句从数据库里面分组取出需要显示的数据
*
* @param request
*javax.servlet.http.HttpServletRequest对象
* @param sql
*String 查询数据库的sql语句
* @param pageSize
*int 每页显示的条数
* @param groupSize
*int 分成多少组
* @param url
*String 页面跳转的路径，若没有特殊的参数传递，可以传入null或""，
*如是在aciton里面调用 ， 并且action是继承自DispatherAction的话最好传入完整的路径
*/
public void init(HttpServletRequest request, String sql, int pageSize,
int groupSize, String url) {
// 当前第几页
String curPage = request.getParameter("pageNo");
init(request, sql, pageSize, groupSize, parseInt(curPage, -1), url);
}
/**
* 每次通过sql语句从数据库里面分组取出需要显示的数据
*
* @param request
*javax.servlet.http.HttpServletRequest对象
* @param sql
*String 查询数据库的sql语句
* @param pageSize
*int 每页显示的条数
* @param groupSize
*int 分成多少组
* @param url
*String 页面跳转的路径，若没有特殊的参数传递，可以传入null或""，
*如是在aciton里面调用，并且action是继承自DispatherAction的话最好传入完整的路径
*/
public void init(HttpServletRequest request, String sql, int pageSize,
int groupSize, int pageNo) {
init(request, sql, pageSize, groupSize, pageNo, "");
}
太多了，贴不下，见附件
谁能给我个完整的java 分页代码 谢谢了import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Enumeration;
import javax.servlet.http.HttpServletRequest;
import com.lqh.dao.db.DBCon;
public class PageDAO {
public static final String Text = "text";
public static final String Image = "image";
public static final String BbsText = "bbstext";
public static final String BbsImage = "bbsimage";
private HttpServletRequest request;
private int currentpage = 1; // 当前是第几页
private int pagecount = 0; // 一共有多少页
private int rscount = 0; // 一共有多少行
private int pagesize = 10; // 每页有多少行[默认为20行]
public PageDAO(HttpServletRequest request) {
this.request = request;
}
public int getCurrentpage() {
return currentpage;
}
public void setCurrentpage(int currentpage) {
this.currentpage = currentpage;
}
public int getPagecount() {
return pagecount;
}
public void setPagecount(int pagecount) {
this.pagecount = pagecount;
}
public int getPagesize() {
return pagesize;
}
public void setPagesize(int pagesize) {
this.pagesize = pagesize;
}
public int getRscount() {
return rscount;
}
public void setRscount(int rscount) {
this.rscount = rscount;
}
/**
* 传入SQL语句获取总记录数
*/
public int getRsCountForRs(String sql) {
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
DBCon dbcon=new DBCon();
try {
conn = dbcon.getConn();
ps = conn.prepareStatement(sql);
rs = ps.executeQuery();
if (rs.next()) {
rs.last();
this.rscount = rs.getRow();
} else {
this.rscount = 0;
}
} catch (Exception ex) {
ex.printStackTrace();
this.rscount = 0;
} finally {
dbcon.tryClose(rs, ps, conn);
}
return this.rscount;
}
public int getRsCountForSQL(String sql) {
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
DBCon dbcon=new DBCon();
try {
conn = dbcon.getConn();
ps = conn.prepareStatement(sql);
rs = ps.executeQuery();
if (rs.next()) {
this.rscount = rs.getInt("rscount");
} else {
this.rscount = 0;
}
} catch (Exception ex) {
ex.printStackTrace();
this.rscount = 0;
} finally {
dbcon.tryClose(rs, ps, conn);
}
return this.rscount;
}
/**
* 获取总页数
*
* @return int
*/
public int getPageCount() {
try {
this.pagecount = ((this.rscount - 1) / this.pagesize)1;
} catch (Exception ex) {
this.pagecount = 0;
}
return this.pagecount;
}
/**
* 获取当前页码的设置
*
* @return int
*/
public int getCurrentPage() {
try {
if (this.request.getParameter("currentpage") != null
Integer.parseInt(this.request
.getParameter("currentpage"))1) {
this.currentpage = Integer.parseInt(this.request
.getParameter("currentpage"));
} else {
this.currentpage = 1;
}
} catch (Exception ex) {
this.currentpage = 1;
}
return this.currentpage;
}
/**
* 分页工具条
*
* @param fileName
*String
* @return String
*/
public String pagetool(String flag) {
StringBuffer str = new StringBuffer();
String url = this.getParamUrl();
int ProPage = this.currentpage - 1;
int Nextpage = this.currentpage1;
// 文字的分页
if (flag.equals(PageDAO.Text)) {
str.append("form method='post' name='pageform' action=''");
str
.append("table style='color: windowframe' width='100%' border='0' cellspacing='0' cellpadding='0'");
str.append("tr");
str.append("td width='20%'/td");
str.append("td height='26'");
str.append("共有记录"this.rscount"条 ");
str.append("共"this.pagecount"页 ");
str.append("每页"this.pagesize"记录 ");
str.append("现在"this.currentpage"/"this.pagecount"页");
str.append("/tdtd");
if (this.currentpage1) {
str.append("a href='"url"currentpage=1'首页/a");
str.append(" ");
str.append("a href='"url"currentpage="ProPage
"'上一页/a");
str.append(" ");
} else {
str.append("首页");
str.append(" ");
str.append("上一页");
str.append(" ");
}
if (this.currentpagethis.pagecount) {
str.append("a href='"url"currentpage="Nextpage
"'下一页/a");
str.append(" ");
} else {
str.append("下一页");
str.append(" ");
}
if (this.pagecount1this.currentpage != this.pagecount) {
str.append("a href='"url"currentpage="pagecount
"'尾页/a");
str.append(" ");
} else {
str.append("尾页");
str.append(" ");
}
str.append("转到");
str
.append("select name='currentpage' onchange='javascript:ChangePage(this.value);'");
for (int j = 1; j = pagecount; j) {
str.append("option value='"j"'");
if (currentpage == j) {
str.append("selected");
}
str.append("");
str.append(""j"");
str.append("/option");
}
str.append("/select页");
str.append("/tdtd width='3%' /td/tr/table");
str.append("script language='javascript'");
str.append("function ChangePage(testpage){");
str.append("document.pageform.action='"url
"currentpage=' testpage '';");
str.append("document.pageform.submit();");
str.append("}");
str.append("/script");
str.append("/form");
} else if (flag.equals(PageDAO.Image)) {
/**
* 图片的分页
*/
} else if (flag.equals(PageDAO.BbsText)) {
/**
* 论坛形式的分页[直接以数字方式体现]
*/
str
.append("table width='100%' border='0' cellspacing='0' cellpadding='0'");
str.append("tr");
str.append("td width='3%' /td");
str.append("td height='26'");
str.append("记录"this.rscount"条");
str.append("共"this.pagecount"页");
str.append("每页"this.pagesize"记录");
str.append("现在"this.currentpage"/"this.pagecount"页");
str.append("/tdtd");
// 设定是否有首页的链接
if (this.currentpage1) {
str.append("a href='"url"currentpage=1'首页/a");
str.append("");
}
// 设定是否有上一页的链接
if (this.currentpage1) {
str.append("a href='"url"currentpage="ProPage
"'上一页/a");
str.append("");
}
// 如果总页数只有10的话
if (this.pagecount = 10) {
for (int i = 1; i = this.pagecount; i) {
if (this.currentpage == i) {
str.append("font color=red["i
"]/font");
} else {
str.append("a href='"url"currentpage="i
"'"i"/a");
}
}
} else {
// 说明总数有超过10页
// 制定特环的开始页和结束页
int endPage = this.currentpage4;
if (endPagethis.pagecount) {
endPage = this.pagecount;
}
int startPage = 0;
if (this.pagecount = 8this.currentpage = 8) {
startPage = this.currentpage - 5;
} else {
// 表示从第一页开始算
startPage = 1;
}
System.out.println(startPage);
System.out.println(endPage);
for (int i = startPage; i = endPage; i) {
if (this.currentpage == i) {
str.append("font color=red["i
"]/font");
} else {
str.append("a href='"url"currentpage="i
"'"i"/a");
}
}
}
// 设定是否有下一页的链接
if (this.currentpagethis.pagecount) {
str.append("a href='"url"currentpage="Nextpage
"'下一页/a");
str.append("");
}
// 设定是否有尾页的链接
if (this.pagecount1this.currentpage != this.pagecount) {
str.append("a href='"url"currentpage="pagecount
"'尾页/a");
str.append("");
}
str.append("/tdtd width='3%' /td/tr/table");
} else if (flag.equals(PageDAO.BbsImage)) {
/**
* 论坛形式的分页[以图片的方式体现]
*/
// 设定分页显示的CSS
str.append("style");
str
.append("BODY {FONT-SIZE: 12px;FONT-FAMILY:宋体;WIDTH: 60%; PADDING-LEFT: 25px;}");
str
.append("DIV.meneame {PADDING-RIGHT: 3px; PADDING-LEFT: 3px; FONT-SIZE: 80%; PADDING-BOTTOM: 3px; MARGIN: 3px; COLOR: #ff6500; PADDING-TOP: 3px; TEXT-ALIGN: center}");
str
.append("DIV.meneame A {BORDER-RIGHT: #ff9600 1px solid; PADDING-RIGHT: 7px; BACKGROUND-POSITION: 50% bottom; BORDER-TOP: #ff9600 1px solid; PADDING-LEFT: 7px; BACKGROUND-IMAGE: url('"
this.request.getContextPath()
"/meneame.jpg'); PADDING-BOTTOM: 5px; BORDER-LEFT: #ff9600 1px solid; COLOR: #ff6500; MARGIN-RIGHT: 3px; PADDING-TOP: 5px; BORDER-BOTTOM: #ff9600 1px solid; TEXT-DECORATION: none}");
str
.append("DIV.meneame A:hover {BORDER-RIGHT: #ff9600 1px solid; BORDER-TOP: #ff9600 1px solid; BACKGROUND-IMAGE: none; BORDER-LEFT: #ff9600 1px solid; COLOR: #ff6500; BORDER-BOTTOM: #ff9600 1px solid; BACKGROUND-COLOR: #ffc794}");
str
.append("DIV.meneame SPAN.current {BORDER-RIGHT: #ff6500 1px solid; PADDING-RIGHT: 7px; BORDER-TOP: #ff6500 1px solid; PADDING-LEFT: 7px; FONT-WEIGHT: bold; PADDING-BOTTOM: 5px; BORDER-LEFT: #ff6500 1px solid; COLOR: #ff6500; MARGIN-RIGHT: 3px; PADDING-TOP: 5px; BORDER-BOTTOM: #ff6500 1px solid; BACKGROUND-COLOR: #ffbe94}");
str
.append("DIV.meneame SPAN.disabled {BORDER-RIGHT: #ffe3c6 1px solid; PADDING-RIGHT: 7px; BORDER-TOP: #ffe3c6 1px solid; PADDING-LEFT: 7px; PADDING-BOTTOM: 5px; BORDER-LEFT: #ffe3c6 1px solid; COLOR: #ffe3c6; MARGIN-RIGHT: 3px; PADDING-TOP: 5px; BORDER-BOTTOM: #ffe3c6 1px solid}");
str.append("/style");
str.append("div class=\"meneame\"");
// 判定是否有上一页
if (this.currentpage1) {
str.append("a href='"url
"currentpage=1' hidefocus=\"true\"首页/a");
str.append("");
str.append("a href='"url"currentpage="ProPage
"' hidefocus=\"true\"上一页/a");
str.append("");
} else {
str.append("span class=\"disabled\"首页/span");
str.append("");
str.append("span class=\"disabled\"上一页/span");
str.append("");
}
// 显示中间的图片
if (this.pagecount = 10) {
for (int i = 1; i = this.pagecount; i) {
if (this.currentpage == i) {
str.append("span class=\"current\""i"/span");
} else {
str.append("a href='"url"currentpage="i
"' hidefocus=\"true\""i
"/a");
}
}
} else {
// 说明总数有超过10页
// 制定特环的开始页和结束页
int endPage = this.currentpage4;
if (endPagethis.pagecount) {
endPage = this.pagecount;
}
int startPage = 0;
if (this.pagecount = 8this.currentpage = 8) {
startPage = this.currentpage - 5;
} else {
// 表示从第一页开始算
startPage = 1;
}
System.out.println(startPage);
System.out.println(endPage);
for (int i = startPage; i = endPage; i) {
if (this.currentpage == i) {
str.append("span class=\"current\""i"/span");
} else {
str.append("a href='"url"currentpage="i
"' hidefocus=\"true\""i
"/a");
}
}
}
// 判断下一页和尾页
if (this.currentpagethis.pagecount) {
if (this.currentpagethis.pagecount - 10) {
str.append("...");
str.append("a href='"url"currentpage="
(this.pagecount - 1)"' hidefocus=\"true\""
(this.pagecount - 1)"/a");
str.append("a href='"url"currentpage="
this.pagecount"' hidefocus=\"true\""
this.pagecount"/a");
}
str.append("a href='"url"currentpage="Nextpage
"' hidefocus=\"true\"下一页/a");
str.append("");
} else {
str.append("span class=\"disabled\"下一页/span");
str.append("");
}
if (this.pagecount1this.currentpage != this.pagecount) {
str.append("a href='"url"currentpage="pagecount
"' hidefocus=\"true\"尾页/a");
str.append("");
} else {
str.append("span class=\"disabled\"尾页/span");
str.append("");
}
str.append("/div");
}
return str.toString();
}
public String getParamUrl() {
String url = "";
url = this.request.getRequestURI().toString();
if (url.indexOf("?") == -1) {
url = url"?";
}
String totalParams = "";
Enumeration params = this.request.getParameterNames();// 得到所有参数名
while (params.hasMoreElements()) {
String tempName = params.nextElement().toString();
String tempValue = https://www.04ip.com/post/this.request.getParameter(tempName);
if (tempValue != null!tempValue.equals("")
!tempName.equals("currentpage")) {
if (totalParams.equals("")) {
totalParams = totalParamstempName"="tempValue;
} else {
totalParams = totalParams""tempName"="
tempValue;
}
}
}
String totalUrl = urltotalParams;
return totalUrl;
}
}
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