JAVA項(xiàng)目中的真分頁與假分頁的代碼怎么寫~

真分頁：每次從數(shù)據(jù)庫里按照排序方法，取一段數(shù)據(jù)，比如每頁20條，第一頁就是1－20 ，第二頁就是21－40。它是每次都從數(shù)據(jù)庫里查詢。都是最新的。假分頁：一次從數(shù)據(jù)庫里得到很多頁的數(shù)據(jù)，然后緩存起來。比如每頁20條，一次取了100條，緩存起來。第一頁依然是1－20 ，第二頁就是21－40。到第6頁的時(shí)候，再從數(shù)據(jù)庫里取101－200條，在緩存起來。只不過，取數(shù)據(jù)的時(shí)候不是從數(shù)據(jù)庫里取了，而是在緩存里取。但是這個(gè)數(shù)據(jù)有可能不是最新的，因?yàn)椴皇侵苯訌臄?shù)據(jù)庫里查詢的。這種多用在更新不多的數(shù)據(jù)上。

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怎樣辨別java代碼真分頁和假分頁

辨別java代碼真分頁和假分頁：

看查詢的SQL語句，如果一次 取全部數(shù)據(jù)，就是假分頁，如果SQL語句是取每頁的數(shù)據(jù)條數(shù)，就是真分頁。

Java中實(shí)現(xiàn)分頁效果的詳細(xì)代碼

head

%

const MaxPerPage=20

dim sql

dim rs

dim totalPut

dim CurrentPage

dim TotalPages

dim i,j

%

/head

body

%

conn = "DBQ=" + server.mappath("wj028.mdb") + ";DefaultDir=;DRIVER={Microsoft Access Driver (*.mdb)};"

sql = "SELECT * FROM USER order by id desc"

set rs=server.createobject("adodb.recordset")

rs.open SQL,conn,1,1

rs.MoveFirst

rs.pagesize=MaxPerPage

howmanyfields=rs.Fields.Count-1

If trim(Request("Page"))"" then

CurrentPage= CLng(request("Page"))

If CurrentPage rs.PageCount then

CurrentPage = rs.PageCount

End If

Else

CurrentPage= 1

End If

if rs.eof then

response.write "p align='center'沒有記錄!/p"

else

totalPut=rs.recordcount

if CurrentPage1 then

if (currentPage-1)*MaxPerPagetotalPut then

rs.move(currentPage-1)*MaxPerPage

dim bookmark

bookmark=rs.bookmark

end if

end if

dim n,k

if (totalPut mod MaxPerPage)=0 then

n= totalPut \ MaxPerPage

else

n= totalPut \ MaxPerPage + 1

end if%

% i=0

do while not rs.EOF and imaxperpage

%

%

rs.movenext

i=i+1

loop

%

第%=currentpage%頁

共%=n%頁

%

k=currentpage

if k1 then

response.write "[b"+"a href='list.asp?page=1'首頁/a/b]"

response.write "[b"+"a href='list.asp?page="+cstr(k-1)+"'上一頁/a/b]"

else

Response.Write "[首頁][上一頁]"

end if

if kn then

response.write "[b"+"a href='list.asp?page="+cstr(k+1)+"'下一頁/a/b] "

response.write "[b"+"a href='list.asp?page="+cstr(n)+"'尾頁/a/b] "

else

Response.Write "[下一頁][尾頁]"

end if

%

%

end if

set rs=nothing

set conn=nothing

%

/body

求java分頁代碼，急用！

package common.util;

import java.util.*;

public class PageController implements IPageModel {

private Collection model;

//數(shù)據(jù)總行數(shù)

private int totalRowCount = 0; //

//總頁數(shù)

private int pageCount = 0;

//每頁應(yīng)顯示的行數(shù)

private int maxPageRowCount = 0;

//當(dāng)前頁行數(shù)

private int currPageRowCount = 0;

//當(dāng)前頁號(hào)

private int currPageNum;

//默認(rèn)構(gòu)造

public PageController() {

super();

}

//傳入模型

public PageController(Collection model) {

setPageController(model);

}

//設(shè)一個(gè)分頁模型

public void setPageController(Collection model) {

this.model = model;

this.totalRowCount = model.size();

}

/**

* 總頁數(shù)

* @return int

*/

public int getPageCount() {

return this.pageCount;

}

/**

* getPageContents

*

* @param intPageNum int

* @return Object

*/

public Object getPageContents(int intPageNum) {

//非法數(shù)據(jù)

if(intPageNum1){

intPageNum=1;

}

if(intPageNumpageCount){

intPageNum=pageCount;

}

//指定當(dāng)前頁

this.currPageNum=intPageNum;

int i = 0;

ArrayList arr = new ArrayList();

//如果是合法的范圍

if (intPageNum 0 intPageNum = pageCount) {

//計(jì)算該頁的開始號(hào)和結(jié)束號(hào)

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{//最后一頁

return totalRowCount-(pageCount-1)*maxPageRowCount;

}

}

public int getCurrentPageNum(){

return currPageNum;

}

/**

* setMaxPageRows

*

* @return int

*/

public void setMaxPageRows(int rowCount) {

maxPageRowCount = rowCount;

//計(jì)算總頁數(shù)

if (totalRowCount % maxPageRowCount 0) { //有余數(shù)

pageCount = totalRowCount / maxPageRowCount + 1;

}

else {

pageCount = totalRowCount / maxPageRowCount;

}

}

/**

* getMaxPageRows

*/

public int getMaxPageRows() {

return maxPageRowCount;

}

//私有方法，返回集合中指定范圍的數(shù)據(jù)

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;

}

}

誰能給我個(gè)完整的java 分頁代碼 謝謝了

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; // 當(dāng)前是第幾頁

private int pagecount = 0; // 一共有多少頁

private int rscount = 0; // 一共有多少行

private int pagesize = 10; // 每頁有多少行[默認(rèn)為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;

}

/**

* 傳入SQL語句獲取總記錄數(shù)

*/

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;

}

/**

* 獲取總頁數(shù)

*

* @return int

*/

public int getPageCount() {

try {

this.pagecount = ((this.rscount - 1) / this.pagesize) + 1;

} catch (Exception ex) {

this.pagecount = 0;

}

return this.pagecount;

}

/**

* 獲取當(dāng)前頁碼的設(shè)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;

}

/**

* 分頁工具條

*

* @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;

// 文字的分頁

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("共有記錄" + this.rscount + "條?");

str.append("共" + this.pagecount + "頁?");

str.append("每頁" + this.pagesize + "記錄?");

str.append("現(xiàn)在" + this.currentpage + "/" + this.pagecount + "頁");

str.append("/tdtd");

if (this.currentpage 1) {

str.append("a href='" + url + "currentpage=1'首頁/a");

str.append("?");

str.append("a href='" + url + "currentpage=" + ProPage

+ "'上一頁/a");

str.append("?");

} else {

str.append("首頁");

str.append("?");

str.append("上一頁");

str.append("?");

}

if (this.currentpage this.pagecount) {

str.append("a href='" + url + "currentpage=" + Nextpage

+ "'下一頁/a");

str.append("?");

} else {

str.append("下一頁");

str.append("?");

}

if (this.pagecount 1 this.currentpage != this.pagecount) {

str.append("a href='" + url + "currentpage=" + pagecount

+ "'尾頁/a");

str.append("?");

} else {

str.append("尾頁");

str.append("?");

}

str.append("轉(zhuǎn)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頁");

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)) {

/**

* 圖片的分頁

*/

} else if (flag.equals(PageDAO.BbsText)) {

/**

* 論壇形式的分頁[直接以數(shù)字方式體現(xiàn)]

*/

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("記錄" + this.rscount + "條??");

str.append("共" + this.pagecount + "頁??");

str.append("每頁" + this.pagesize + "記錄??");

str.append("現(xiàn)在" + this.currentpage + "/" + this.pagecount + "頁");

str.append("/tdtd");

// 設(shè)定是否有首頁的鏈接

if (this.currentpage 1) {

str.append("a href='" + url + "currentpage=1'首頁/a");

str.append("??");

}

// 設(shè)定是否有上一頁的鏈接

if (this.currentpage 1) {

str.append("a href='" + url + "currentpage=" + ProPage

+ "'上一頁/a");

str.append("???");

}

// 如果總頁數(shù)只有10的話

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 {

// 說明總數(shù)有超過10頁

// 制定特環(huán)的開始頁和結(jié)束頁

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 {

// 表示從第一頁開始算

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??");

}

}

}

// 設(shè)定是否有下一頁的鏈接

if (this.currentpage this.pagecount) {

str.append("a href='" + url + "currentpage=" + Nextpage

+ "'下一頁/a");

str.append("??");

}

// 設(shè)定是否有尾頁的鏈接

if (this.pagecount 1 this.currentpage != this.pagecount) {

str.append("a href='" + url + "currentpage=" + pagecount

+ "'尾頁/a");

str.append("??");

}

str.append("/tdtd width='3%'?/td/tr/table");

} else if (flag.equals(PageDAO.BbsImage)) {

/**

* 論壇形式的分頁[以圖片的方式體現(xiàn)]

*/

// 設(shè)定分頁顯示的CSS

str.append("style");

str

.append("BODY {FONT-SIZE: 12px;FONT-FAMILY:宋體;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\"");

// 判定是否有上一頁

if (this.currentpage 1) {

str.append("a href='" + url

+ "currentpage=1' hidefocus=\"true\"首頁/a");

str.append("???");

str.append("a href='" + url + "currentpage=" + ProPage

+ "' hidefocus=\"true\"上一頁/a");

str.append("???");

} else {

str.append("span class=\"disabled\"首頁/span");

str.append("??");

str.append("span class=\"disabled\"上一頁/span");

str.append("??");

}

// 顯示中間的圖片

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 {

// 說明總數(shù)有超過10頁

// 制定特環(huán)的開始頁和結(jié)束頁

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 {

// 表示從第一頁開始算

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??");

}

}

}

// 判斷下一頁和尾頁

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\"下一頁/a");

str.append("??");

} else {

str.append("span class=\"disabled\"下一頁/span");

str.append("??");

}

if (this.pagecount 1 this.currentpage != this.pagecount) {

str.append("a href='" + url + "currentpage=" + pagecount

+ "' hidefocus=\"true\"尾頁/a");

str.append("??");

} else {

str.append("span class=\"disabled\"尾頁/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();// 得到所有參數(shù)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;

}

}

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