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java分页异步代码 java分页查询原理思路
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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 (intPageNum 0 intPageNum = pageCount) {
//计算该页的开始号和结束号
int lfromrow = (intPageNum - 1) * maxPageRowCount;
arr = (ArrayList) getElementsAt(model, lfromrow, lfromrow + maxPageRowCount-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 % maxPageRowCount 0) { //有余数
pageCount = totalRowCount / maxPageRowCount + 1;
}
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) {
Iterator iter = model.iterator();
ArrayList arr = new ArrayList();
if (iter != null) {
int i = 0;
while (iter.hasNext()) {
Object obj=iter.next();
if (i = fromIndex i = toIndex) {
arr.add(obj);
}
if (i toIndex) {
break;
}
i = i + 1;
}
}
return arr;
}
}
相关问答
Q1: 关于分页的一段代码 JAVA
if((当前页码-1)*每页显示数==0) //如果是首页
{
rs.beforeFirst(); //将指针移到 ResultSet 对象java分页异步代码的开头java分页异步代码，位于第一行之前
}
else //不是第一页
{
rs.absolute((当前页码-1)*每页显示数) //移到指定行java分页异步代码，这个公式算出来的是上一页的最后一行记录
}
这个分页不好，每次都把所有数据查询出来，一般都在SQL语句里判断，直接查询出本页的数据
Q2: 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java分页异步代码的设置
*
* @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.currentpage + 1;
// 文字java分页异步代码的分页
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.currentpage 1) {
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.currentpage this.pagecount) {
str.append("a href='" + url + "currentpage=" + Nextpage
+ "'下一页/a");
str.append(" ");
} else {
str.append("下一页");
str.append(" ");
}
if (this.pagecount 1 this.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java分页异步代码的分页
*/
} 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.currentpage 1) {
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.currentpage 1) {
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.currentpage + 4;
if (endPage this.pagecount) {
endPage = this.pagecount;
}
int startPage = 0;
if (this.pagecount = 8 this.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.currentpage this.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.pagecount 1 this.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.currentpage 1) {
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.currentpage + 4;
if (endPage this.pagecount) {
endPage = this.pagecount;
}
int startPage = 0;
if (this.pagecount = 8 this.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.currentpage this.pagecount) {
if (this.currentpage this.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.pagecount 1 this.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 = this.request.getParameter(tempName);
if (tempValue != null !tempValue.equals("")
!tempName.equals("currentpage")) {
if (totalParams.equals("")) {
totalParams = totalParams + tempName + "=" + tempValue;
} else {
totalParams = totalParams + "" + tempName + "="
+ tempValue;
}
}
}
String totalUrl = url + totalParams;
return totalUrl;
}
}
Q3: 谁能给我一个java分页标签的代码参考一下
下面的代码是纯jsp页面分页
也有java后台代码的分页，你如果想要的话就说。
%@ page contentType="text/html; charset=gb2312" %
%@ page language="java" %
%@ page import="java.sql.*" %
%
//驱动程序名，比较旧了，如果你用mysql5,自己改。
String driverName="org.gjt.mm.mysql.Driver";
String userName="root";//数据库用户名
String userPasswd="";//密码
String dbName="bookstore";//数据库名
String tableName="items"; //表名
//连接字符串
String url="jdbc:mysql://localhost/"+dbName+"?user="+userName+"password="+userPasswd;
Class.forName(driverName).newInstance();
Connection connection=DriverManager.getConnection(url);
Statement statement = connection.createStatement();
//每页显示记录数
int PageSize = 8;
int StartRow = 0; //开始显示记录的编号
int PageNo=0;//需要显示的页数
int CounterStart=0;//每页页码的初始值
int CounterEnd=0;//显示页码的最大值
int RecordCount=0;//总记录数;
int MaxPage=0;//总页数
int PrevStart=0;//前一页
int NextPage=0;//下一页
int LastRec=0;
int LastStartRecord=0;//最后一页开始显示记录的编号
//获取需要显示的页数，由用户提交
if(request.getParameter("PageNo")==null){ //如果为空，则表示第1页
if(StartRow == 0){
PageNo = StartRow + 1; //设定为1
}
}else{
PageNo = Integer.parseInt(request.getParameter("PageNo")); //获得用户提交的页数
StartRow = (PageNo - 1) * PageSize; //获得开始显示的记录编号
}
//设置显示页码的初始值
if(PageNo % PageSize == 0){
CounterStart = PageNo - (PageSize - 1);
}else{
CounterStart = PageNo - (PageNo % PageSize) + 1;
}
CounterEnd = CounterStart + (PageSize - 1);
%
html
head
title分页显示记录/title
link rel="stylesheet" href="style.css" type="text/css"
/head
%
//获取总记录数
ResultSet rs = statement.executeQuery("select count(*) from items" );
rs.next();
RecordCount = rs.getInt(1);
rs = statement.executeQuery("SELECT image_url,author,price,item_id FROM items ORDER BY item_id DESC LIMIT "
+StartRow+", "+PageSize);
//获取总页数
MaxPage = RecordCount % PageSize;
if(RecordCount % PageSize == 0){
MaxPage = RecordCount / PageSize;
}else{
MaxPage = RecordCount/PageSize+1;
}
%
body class="UsePageBg"
table width="100%" border="0" class="InternalHeader"
tr
td width="24%"font size=4分页显示记录/font/td
td width="76%"
font size=4%="总共"+RecordCount+"条记录 - 当前页："+PageNo+"/"+MaxPage %/font
/td
/tr
/table
br
table width="100%" border="0" class="NormalTableTwo"
tr
td class="InternalHeader"记录序号/td
td class="InternalHeader" 图像路径/td
td class="InternalHeader" 作者/td
td class="InternalHeader" 价格/td
td class="InternalHeader" 图书编号/td
/tr
%
int i = 1;
while (rs.next()) {
int bil = i + (PageNo-1)*PageSize;
%
tr
td class="NormalFieldTwo" %=bil %/td
td class="NormalFieldTwo" %=rs.getString(1)%/td
td class="NormalFieldTwo" %=rs.getString(2)%/td
td class="NormalFieldTwo" %=rs.getString(3)%/td
td class="NormalFieldTwo" %=rs.getString(4)%/td
/tr
%
i++;
}%
/table
br
table width="100%" border="0" class="InternalHeader"
tr
tddiv align="center"
%
out.print("font size=4");
//显示第一页或者前一页的链接
//如果当前页不是第1页，则显示第一页和前一页的链接
if(PageNo != 1){
PrevStart = PageNo - 1;
out.print("a href=TestPage.jsp?PageNo=1第一页 /a: ");
out.print("a href=TestPage.jsp?PageNo="+PrevStart+"前一页/a");
}
out.print("[");
//打印需要显示的页码
for(int c=CounterStart;c=CounterEnd;c++){
if(c MaxPage){
if(c == PageNo){
if(c %PageSize == 0){
out.print(c);
}else{
out.print(c+" ,");
}
}else if(c % PageSize == 0){
out.print("a href=TestPage.jsp?PageNo="+c+""+c+"/a");
}else{
out.print("a href=TestPage.jsp?PageNo="+c+""+c+"/a ,");
}
}else{
if(PageNo == MaxPage){
out.print(c);
break;
}else{
out.print("a href=TestPage.jsp?PageNo="+c+""+c+"/a");
break;
}
}
}
out.print("]");;
if(PageNo MaxPage){ //如果当前页不是最后一页，则显示下一页链接
NextPage = PageNo + 1;
out.print("a href=TestPage.jsp?PageNo="+NextPage+"下一页/a");
}
//同时如果当前页不是最后一页，要显示最后一页的链接
if(PageNo MaxPage){
LastRec = RecordCount % PageSize;
if(LastRec == 0){
LastStartRecord = RecordCount - PageSize;
}
else{
LastStartRecord = RecordCount - LastRec;
}
out.print(":");
out.print("a href=TestPage.jsp?PageNo="+MaxPage+"最后一页/a");
}
out.print("/font");
%
/div
/td
/tr
/table
%
rs.close();
statement.close();
connection.close();
%
/body
/html
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