使用分頁(yè)類,直接調(diào)用就可以,代碼如下:
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package com.godwin.news.util;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.ArrayList;
/**
* 分頁(yè)類,用于封閉分頁(yè)顯示信息
*
* @author javabs
*
*/
public class Pager {
// 當(dāng)前頁(yè)
private int currentPage;
// 總頁(yè)數(shù)
private int totalPage;
// 總記錄數(shù)
private int totalRecord;
// 每頁(yè)條數(shù)
private int pageSize;
// 是否有下一頁(yè)
private int hasNext;
private ArrayList keys;
private ArrayList values;
// 查詢串
private String queryString;
// 首頁(yè)
private String firstLink;
// 上一頁(yè)
private String previousLink;
// 下一頁(yè)
private String nextLink;
// 尾頁(yè)
private String lastLink;
// 鏈接
private String forScriptLink;
public Pager(int pageSize, String queryString) {
keys = new ArrayList();
values = new ArrayList();
setQueryString(queryString);
setPageSize(pageSize);
}
public String getForScriptLink() {
if (keys.contains("toPage"))
removeKey("toPage");
String tmp = getQueryString();
if (tmp.length() == 0)
return "?";
else
return "?" + tmp + "";
}
public int getCurrentPage() {
return currentPage;
}
public void setCurrentPage(String toPage) {
int tmpage = 1;
try {
tmpage = Integer.parseInt(toPage);
} catch (NumberFormatException e) {
tmpage = 1;
}
if (tmpage 1)
tmpage = 1;
else if (tmpage getTotalPage())
tmpage = getTotalPage();
currentPage = tmpage;
}
public String getFirstLink() {
return getQueryStr(1);
}
public int getHasNext() {
int i = 1;
if (getCurrentPage() = getTotalPage())
i = 0;
return i;
}
public String getLastLink() {
return getQueryStr(getTotalPage());
}
public String getNextLink() {
return getQueryStr(currentPage == totalPage ? currentPage : (currentPage + 1));
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public String getPreviousLink() {
return getQueryStr(currentPage == 1 ? currentPage : currentPage - 1);
}
public void setPreviousLink(String previousLink) {
this.previousLink = previousLink;
}
public String getQueryString() {
StringBuffer sb = new StringBuffer();
for (int i = 0; i keys.size(); i++) {
String key = (String) keys.get(i);
String value = (String) values.get(i);
sb.append("");
sb.append(key);
sb.append("=");
sb.append(value);
}
return sb.delete(0, 1).toString();
}
public void setQueryString(String queryString) {
if (queryString != null) {
String s[] = queryString.split("");
for (int i = 0; i s.length; i++) {
String s1[] = s[i].split("=");
if (s1.length == 2) {
keys.add(s1[0]);
values.add(s1[1]);
} else {
keys.add(s1[0]);
values.add("");
}
}
}
}
public int getTotalPage() {
return totalPage;
}
public void setTotalPage() {
if (totalRecord % pageSize == 0) {
totalPage = totalRecord / pageSize;
totalPage = totalPage == 0 ? 1 : totalPage;
}
else
totalPage = totalRecord / pageSize + 1;
}
public int getTotalRecord() {
return totalRecord;
}
public void setTotalRecord(int totalRecord) {
this.totalRecord = totalRecord;
setTotalPage();
}
public String[] getQueryParameterValues(String key) {
return getQueryParameterValues(key, "UTF-8");
}
public String[] getQueryParameterValues(String key, String decode) {
ArrayList ret = new ArrayList();
for (int i = 0; i keys.size(); i++)
if (((String) keys.get(i)).equals(key))
try {
ret.add(URLDecoder.decode((String) values.get(i), decode));
} catch (UnsupportedEncodingException e) {
ret.add((String) values.get(i));
}
if (ret.size() == 0)
return null;
String strArr[] = new String[ret.size()];
for (int i = 0; i ret.size(); i++)
strArr[i] = (String) ret.get(i);
return strArr;
}
public String getQueryParameter(String key) {
return getQueryParameter(key, "UTF-8");
}
public String getQueryParameter(String key, String decode) {
String value = "";
if (key != "toPage") {
try {
value = URLDecoder.decode(getValue(key), decode);
} catch (UnsupportedEncodingException e) {
value = getValue(key);
}
} else {
int tmpage = 1;
try {
value = getValue(key);
tmpage = Integer.parseInt(value);
} catch (NumberFormatException e) {
tmpage = 1;
} catch (NullPointerException e1) {
tmpage = 1;
}
if (tmpage 1)
tmpage = 1;
else if (tmpage getTotalPage())
tmpage = getTotalPage();
value = (new StringBuffer(String.valueOf(tmpage))).toString();
}
return value;
}
public void setQueryParameter(String key, String value) {
if (key.equals("toPage"))
removeKey(key);
keys.add(key);
values.add(value);
}
public String getQueryStr(int toPage) {
setQueryParameter("toPage", (new StringBuffer(String.valueOf(toPage))).toString());
return "?" + getQueryString();
}
private String getValue(String key) {
String ret = "";
for (int i = 0; i keys.size(); i++) {
if (!((String) keys.get(i)).equals(key))
continue;
ret = (String) values.get(i);
break;
}
return ret;
}
private void removeKey(String key) {
for (int i = 0; i keys.size(); i++) {
if (!((String) keys.get(i)).equals(key))
continue;
keys.remove(i);
values.remove(i);
break;
}
}
public static void main(String args[]) {
String str = "a=中文aab=2c=3c=4c=5";
Pager page = new Pager(2, str);
page.setTotalRecord(10);
page.setCurrentPage("1");
System.out.println(page.getFirstLink());
System.out.println(page.getPreviousLink());
System.out.println(page.getNextLink());
System.out.println(page.getLastLink());
String s = page.getQueryParameter("a");
System.out.println("s: " + s);
}
}
實(shí)現(xiàn)原理很簡(jiǎn)單,就是建立一個(gè)Page類,里面放當(dāng)前訪問的頁(yè)數(shù)和每一頁(yè)顯示的記錄行數(shù)。然后通過分頁(yè)計(jì)算就可以得出下列數(shù)據(jù)。
總頁(yè)數(shù) = 總記錄數(shù)/每頁(yè)大小,如果0!=總記錄數(shù)%每頁(yè)大小,那么總頁(yè)數(shù)再+1。
當(dāng)前頁(yè)數(shù)。
表記錄的起始位置=(當(dāng)前頁(yè)數(shù)-1)*每頁(yè)大小。
總記錄數(shù)(select count(*) from [表名] [where [條件]]。從數(shù)據(jù)庫(kù)中查詢得到)
每頁(yè)大小,可以固定,也可以從頁(yè)面?zhèn)鬟^來有了這幾個(gè)參數(shù)之后,就用sql語(yǔ)句查出對(duì)應(yīng)的記錄就可以了。
Java是一種可以撰寫跨平臺(tái)應(yīng)用程序的面向?qū)ο蟮某绦蛟O(shè)計(jì)語(yǔ)言。
Java?技術(shù)具有卓越的通用性、高效性、平臺(tái)移植性和安全性,廣泛應(yīng)用于PC、數(shù)據(jù)中心、游戲控制臺(tái)、科學(xué)超級(jí)計(jì)算機(jī)、移動(dòng)電話和互聯(lián)網(wǎng),同時(shí)擁有全球最大的開發(fā)者專業(yè)社群。
它最初被命名為Oak,目標(biāo)設(shè)定在家用電器等小型系統(tǒng)的編程語(yǔ)言,來解決諸如電視機(jī)、電話、鬧鐘、烤面包機(jī)等家用電器的控制和通訊問題。
由于這些智能化家電的市場(chǎng)需求沒有預(yù)期的高,Sun放棄了該項(xiàng)計(jì)劃。就在Oak幾近失敗之時(shí),隨著互聯(lián)網(wǎng)的發(fā)展,Sun看到了Oak在計(jì)算機(jī)網(wǎng)絡(luò)上的廣闊應(yīng)用前景,于是改造了Oak,以“Java”的名稱正式發(fā)布。
Java的主要工作是通過編程語(yǔ)言來制作互聯(lián)網(wǎng)頁(yè)面、制作動(dòng)態(tài)效果以及網(wǎng)站等技術(shù)。
/**
*?分頁(yè)代碼
*?
*?@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;?//?當(dāng)前頁(yè)數(shù),從0開始
private?int?size?=?0;?//?所有數(shù)據(jù)條數(shù)
private?String?url;?//?頁(yè)面跳轉(zhuǎn)的路徑
private?List?showList;?//?當(dāng)前頁(yè)面需要顯示的數(shù)據(jù)列表
private?int?pageSize?=?20;//?每頁(yè)顯示的數(shù)據(jù)條數(shù)
private?int?groupSize?=?1;//?多少頁(yè)為一組
private?String?pageNavigation;//?導(dǎo)航條
/**
?*?每次通過sql語(yǔ)句從數(shù)據(jù)庫(kù)里面分組取出需要顯示的數(shù)據(jù)
?*?
?*?@param?request
?*????????????javax.servlet.http.HttpServletRequest對(duì)象
?*?@param?sql
?*????????????String?查詢數(shù)據(jù)庫(kù)的sql語(yǔ)句
?*?@param?pageSize
?*????????????int?每頁(yè)顯示的條數(shù)
?*?@param?groupSize
?*????????????int?分成多少組
?*?@param?url
?*????????????String?頁(yè)面跳轉(zhuǎn)的路徑,若沒有特殊的參數(shù)傳遞,可以傳入null或"",
?*????????????如是在aciton里面調(diào)用,并且action是繼承自DispatherAction的話最好傳入完整的路徑
?*/
public?void?init(HttpServletRequest?request,?String?sql,?int?pageSize,
int?groupSize,?int?pageNo,?String?url)?{
//?上一頁(yè)、下一頁(yè)跳轉(zhuǎn)路徑
if?(url?!=?null)?{
this.url?=?url;
}?else?{
this.url?=?request.getRequestURL()?+?"";
}
if?(pageSize??0)
this.pageSize?=?pageSize;//?每頁(yè)多少條記錄
if?(groupSize??0)
this.groupSize?=?groupSize;
//?當(dāng)前第幾頁(yè)
if?(pageNo??0)?{
this.curPageNo?=?0;
}?else?{
this.curPageNo?=?pageNo;
}
int?curGroup?=?this.curPageNo?/?this.groupSize?+?1;
//?是否是新的一組數(shù)據(jù),如果是則到數(shù)據(jù)庫(kù)取數(shù)據(jù)
this.size?=?parseInt(request.getSession().getAttribute("page_all_size")
+?"",?0);
if?(this.curPageNo?%?this.groupSize?==?0
||?(request.getSession().getAttribute("cur_group")?!=?null??parseInt(
""?+?request.getSession().getAttribute("cur_group"),?1)?!=?curGroup)
||?this.size?==?0?||?request.getParameter("reload")?!=?null)?{
request.getSession().setAttribute("cur_group",?curGroup);
if?(pageNo??0
?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);//?設(shè)置頁(yè)面上的顯示數(shù)據(jù)
}?else?{
this.setShowList((List)?request.getSession().getAttribute(
"page_cur_list"));//?設(shè)置頁(yè)面上的顯示數(shù)據(jù)
}
}
/**
?*?每次通過sql語(yǔ)句從數(shù)據(jù)庫(kù)里面分組取出需要顯示的數(shù)據(jù)
?*?
?*?@param?request
?*????????????javax.servlet.http.HttpServletRequest對(duì)象
?*?@param?sql
?*????????????String?查詢數(shù)據(jù)庫(kù)的sql語(yǔ)句
?*?@param?pageSize
?*????????????int?每頁(yè)顯示的條數(shù)
?*?@param?groupSize
?*????????????int?分成多少組
?*?@param?url
?*????????????String?頁(yè)面跳轉(zhuǎn)的路徑,若沒有特殊的參數(shù)傳遞,可以傳入null或"",
?*????????????如是在aciton里面調(diào)用,并且action是繼承自DispatherAction的話最好傳入完整的路徑
?*/
public?void?init(HttpServletRequest?request,?String?sql,?int?pageSize,
int?groupSize,?String?url)?{
//?當(dāng)前第幾頁(yè)
String?curPage?=?request.getParameter("pageNo");
init(request,?sql,?pageSize,?groupSize,?parseInt(curPage,?-1),?url);
}
/**
?*?每次通過sql語(yǔ)句從數(shù)據(jù)庫(kù)里面分組取出需要顯示的數(shù)據(jù)
?*?
?*?@param?request
?*????????????javax.servlet.http.HttpServletRequest對(duì)象
?*?@param?sql
?*????????????String?查詢數(shù)據(jù)庫(kù)的sql語(yǔ)句
?*?@param?pageSize
?*????????????int?每頁(yè)顯示的條數(shù)
?*?@param?groupSize
?*????????????int?分成多少組
?*?@param?url
?*????????????String?頁(yè)面跳轉(zhuǎn)的路徑,若沒有特殊的參數(shù)傳遞,可以傳入null或"",
?*????????????如是在aciton里面調(diào)用,并且action是繼承自DispatherAction的話最好傳入完整的路徑
?*/
public?void?init(HttpServletRequest?request,?String?sql,?int?pageSize,
int?groupSize,?int?pageNo)?{
init(request,?sql,?pageSize,?groupSize,?pageNo,?"");
}
太多了,貼不下,見附件
我以前的jsp頁(yè)面嵌入的
%
richen.setpageSize(8); //設(shè)置一頁(yè)顯示記錄的條數(shù)
richen.setuserID(user1.getUerInfo().get("userID").toString());
Vector vect = new Vector();
vect=richen.getData(); //取出所有的記錄
String pageNumStr=request.getParameter("pageNum"); //取得當(dāng)前的頁(yè)碼
if(pageNumStr==""||pageNumStr==null)
pageNumStr="1";
int pageNum=Integer.parseInt(pageNumStr);
richen.setpageNum(pageNum); //設(shè)置要顯示的那頁(yè)
richen.page();//分頁(yè)
int i=0;
int first=(richen.getpageNum()-1)*richen.getpageSize(); //計(jì)算從哪條記錄開始
int last=richen.getpageNum()*richen.getpageSize();//計(jì)算到哪條結(jié)束
if(richen.getLastpageNum()!=0pageNum==richen.getTotalPage()){ //當(dāng)最后一頁(yè)不夠時(shí)
last=richen.getpageNum()*richen.getpageSize()-(richen.getpageSize()-richen.getLastpageNum());
}
for(i=first;ilast;i++){ //循環(huán)顯示當(dāng)頁(yè)記錄
Hashtable hash = new Hashtable();
hash=(Hashtable)vect.get(i);
%