首先我们需要在web-inf/tld/目录下创建page.tld文件
<?xml version="1.0" encoding="iso-8859-1"?>
<taglib>
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>page</short-name>
<uri>http://www.kevin.com/taglibs/page</uri>
<tag>
<name>htmlpage</name>
<tag-class>com.lss.common.tag.pagetag</tag-class>
<body-content>jsp</body-content>
<description>htmlpage tag</description>
<attribute>
<name>pageno</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>pagesize</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>totalsum</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>url</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>showpage</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
package com.lss.common.tag;
import java.io.ioexception;
import javax.servlet.jsp.jspexception;
import javax.servlet.jsp.jspwriter;
import javax.servlet.jsp.tagext.tagsupport;
import com.lss.common.page.htmlpage;
import com.lss.common.page.page;
import com.lss.common.page.variablepage;
/**
* 分页处理标签
*
* @description
* @date 2012-3-11下午09:08:46
*/
public class pagetag extends tagsupport {
private int pageno;
private int pagesize = 10;
private int totalsum;
private int showpage = 10;
private string url;
public int getpageno() {
return pageno;
}
public void setpageno(int pageno) {
this.pageno = pageno;
}
public int getpagesize() {
return pagesize;
}
public void setpagesize(int pagesize) {
this.pagesize = pagesize;
}
public int gettotalsum() {
return totalsum;
}
public void settotalsum(int totalsum) {
this.totalsum = totalsum;
}
public int getshowpage() {
return showpage;
}
public void setshowpage(int showpage) {
this.showpage = showpage;
}
public string geturl() {
return url;
}
public void seturl(string url) {
this.url = url;
}
@override
public int doendtag() throws jspexception {
if (pagesize == 0) {
return tagsupport.skip_page;// 不显示分页
} else if (pagesize > totalsum) {
return tagsupport.skip_body;// 不显示分页
}
jspwriter out = pagecontext.getout();
try {
if (url.indexof(";jsessionid=") == -1) {
if (url.indexof("?") == -1) {
url += ";jsessionid=" + pagecontext.getsession().getid() + "?pageno=";
} else {
url = url.replacefirst("\\?", ";jsessionid=" + pagecontext.getsession().getid() + "?");
if (url.indexof("pageno=") == -1) {
url += "&pageno=";
}
}
}
url = pagecontext.getservletcontext().getcontextpath() + url;
variablepage variablepage = new variablepage(pageno, totalsum, pagesize, url);
variablepage.setshowpagenum(showpage);
page page = new htmlpage(variablepage);
out.print(page.getfirstno() + " " + page.getbackpagenum() + " " + page.pagination() + " " + page.getnextpagenum() + " " + page.getlastno());
} catch (ioexception ex) {
ex.printstacktrace();
}
return super.doendtag();
}
@override
public void release() {
url = null;
pageno = 0;
totalsum = 0;
pagesize = 10;
super.release();
}
private static final long serialversionuid = -2642907859641024483l;
}
/**
* html 分页类
*
* @description
* @date 2012-3-11下午10:33:14
*/
public class htmlpage extends page {
public htmlpage(variablepage variablepage) {
super(variablepage);
}
public string pagination() {
string printno = "";
// 如果已分页；并且页数小于等于要显示的页数
if (variablepage.totalpage > 1 && variablepage.totalpage <= variablepage.showpagenum) {
return displayall();
// 如果分页数：大于显示的页码数
} else if (variablepage.totalpage > 1 && variablepage.totalpage > variablepage.showpagenum) {
if (variablepage.pageno == 1) {// 当前页等于第一页
return fromfirstpageprint();
} else if (variablepage.pageno == variablepage.totalpage) {// 当前页等于最后一页
return fromlastpageprint();
} else {// 如果当前页：即不是首页也不是尾页
if (variablepage.showpagenum % 2 == 0) {// 可以平分页码
int print$no = variablepage.showpagenum / 2;
if (variablepage.pageno >= print$no) {
int index$no = variablepage.pageno - print$no;
if (variablepage.pageno + print$no >= variablepage.totalpage) {
return fromlastpageprint();
} else {
if (index$no == 0)
index$no = 1;
for (int i = index$no; i < (variablepage.showpagenum + index$no); i++) {
if (i == variablepage.pageno) {// 如果是当前页:不添加连接url
printno += (i + variablepage.split);
} else {
printno += (builda(variablepage, i) + variablepage.split);
}
}
}
} else {
return fromfirstpageprint();
}
} else {// 打印页数不是偶数时：
int print$no = variablepage.showpagenum / 2 + 1;
if (variablepage.pageno >= print$no && variablepage.pageno + print$no < variablepage.totalpage) {
int index$no = variablepage.pageno - print$no + 1;
for (int i = index$no; i < variablepage.showpagenum + index$no; i++) {
if (i == variablepage.pageno) {// 如果是当前页:不添加连接url
printno += (i + variablepage.split);
} else {
printno += (builda(variablepage, i) + variablepage.split);
}
}
} else if (variablepage.pageno <= print$no) {// 从第一页开始
return fromfirstpageprint();
} else {
return fromlastpageprint();
}
}
}
return (printno);
} else {
return "1";
}
}
public string getbackpagenum() {
if (variablepage.pageno <= 1) {
return buildspan("上一页", variablepage);
} else {
return builda("上一页", (variablepage.url + (variablepage.pageno - 1)));
}
}
public string getnextpagenum() {
if (variablepage.pageno >= variablepage.totalpage) {
return buildspan("下一页", variablepage);
} else {
return builda("下一页", variablepage.url + (variablepage.pageno + 1));
}
}
public string buildspan(string text, variablepage variablepage) {
return "<span style=\"color:gray;\">" + text + "</span>";
}
public string builda(string text, string url) {
return "<a href=\"" + url + "\">" + text + "</a>";
}
public string builda(variablepage variablepage, int num) {
return ("<a href=\"" + variablepage.url + num + "\">" + num + "</a>");
}
}
public abstract class page {
protected variablepage variablepage;
public page(variablepage variablepage) {
this.variablepage = variablepage;
calculatetotalpage();
}
public int getstartindex() {
return (getvalidpagenum() - 1) * variablepage.pagesize;
}
public string getbackpagenum() {
if (variablepage.pageno <= 1) {
return buildspan("上一页", variablepage);
} else {
return builda("上一页", variablepage.geturl() + (variablepage.pageno - 1));
}
}
public string getnextpagenum() {
if (variablepage.pageno >= variablepage.totalpage) {
return buildspan("下一页", variablepage);
} else {
return builda("下一页", variablepage.geturl() + (variablepage.pageno + 1));
}
}
/**
* 计算总页数
*/
private void calculatetotalpage() {
if (variablepage.totalsum % variablepage.pagesize == 0) {
variablepage.totalpage = variablepage.totalsum / variablepage.pagesize;
} else {
variablepage.totalpage = variablepage.totalsum / variablepage.pagesize + 1;
}
if (variablepage.totalpage < variablepage.pageno) {
variablepage.pageno = variablepage.totalpage;
} else if (variablepage.pageno < 1) {
variablepage.pageno = 1;
}
}
protected string displayall() {
stringbuilder sbuilder = new stringbuilder(10);
sbuilder.append(variablepage.split);
for (int i = 1; i <= variablepage.totalpage; i++) {
if (i == variablepage.pageno) {
sbuilder.append(i + variablepage.split);
} else {
sbuilder.append(builda(variablepage, i) + variablepage.split);
}
}
return sbuilder.tostring();
}
/**
* 抽象出分页方法
*
* @return
*/
public abstract string pagination();
/**
* 实现从第一页开始打印
*
* @return
*/
protected final string fromfirstpageprint() {
stringbuffer buffer = new stringbuffer(100);
for (int i = 1; i <= variablepage.showpagenum; i++) {
if (i == variablepage.pageno) {// 如果是当前页:不添加连接url
buffer.append(i + variablepage.split);
} else {
buffer.append(builda(variablepage, i) + variablepage.split);
}
}
return buffer.tostring();
}
/**
* 实现从最后一页开始打印
*
* @return
*/
protected final string fromlastpageprint() {
stringbuffer buffer = new stringbuffer(100);
int startpage = variablepage.totalpage - (variablepage.showpagenum - 1);
for (int i = startpage; i <= variablepage.totalpage; i++) {
if (i == variablepage.pageno) {// 如果是当前页:不添加连接url
buffer.append(i + variablepage.split);
} else {
buffer.append(builda(variablepage, i) + variablepage.split);
}
}
return buffer.tostring();
}
public string getfirstno() {
if (isexistspagination()) {
return builda("首页", variablepage.url + 1);
} else {
return buildspan("首页", variablepage);
}
}
/**
* 判断是否存在分页
*
* @return
*/
private boolean isexistspagination() {
if (variablepage.totalsum > 1 && variablepage.totalpage > 1) {
return true;
}
return false;
}
public string getlastno() {
if (isexistspagination()) {
return builda("尾页", variablepage.url + variablepage.totalpage);
} else {
return buildspan("尾页", variablepage);
}
}
protected int getvalidpagenum() {
if (variablepage.totalpage < variablepage.pageno) {
return variablepage.pageno = variablepage.totalpage;
} else if (variablepage.pageno < 1) {
return variablepage.pageno = 1;
} else {
return variablepage.pageno;
}
}
public variablepage getpagecontant() {
return this.variablepage;
}
public abstract string buildspan(string text, variablepage variablepage);
public abstract string builda(string text, string url);
public abstract string builda(variablepage variablepage, int num);
public string printmodifypagesize(int pagesize){
stringbuilder builder=new stringbuilder(100);
builder.append("每页<input type='text' id='pagesize' style='width:20px' maxlength='2' name='pagesize'");
if(pagesize>0){
builder.append(" value='"+pagesize+"' ");
}
builder.append("/>条");
return builder.tostring();
}
}
/**
* 分页基础变量
*
* @description
* @date 2012-3-11下午10:34:00
*/
public class simplevariable {
/**
* 显示页码
*/
protected int showpagenum = 10;
/**
* 连接url
*/
protected string url = null;
/**
* 当前页码
*/
protected int pageno = 1;
/**
* 总页码
*/
protected int totalpage = 1;
/**
* 总条数
*/
protected int totalsum = 0;
/**
* 每页显示条数
*/
protected int pagesize = 10;
public string geturl() {
return url;
}
public void seturl(string url) {
this.url = url;
}
public int gettotalpage() {
return totalpage;
}
public void settotalpage(int totalpage) {
this.totalpage = totalpage;
}
public int gettotalsum() {
return totalsum;
}
public void settotalsum(int totalsum) {
this.totalsum = totalsum;
}
public int getpagesize() {
return pagesize;
}
public void setpagesize(int pagesize) {
this.pagesize = pagesize;
}
public int getshowpagenum() {
return showpagenum;
}
public void setshowpagenum(int showpagenum) {
this.showpagenum = showpagenum;
}
public int getpageno() {
return pageno;
}
public void setpageno(int pageno) {
this.pageno = pageno;
}
}
/**
* 分页变量
*
* @description
* @date 2012-3-11下午10:34:08
*/
public class variablepage extends simplevariable {
protected string split = " ";
protected string style = "class='page'";
public variablepage(int pageno, int totalsum, int pagesize, string url) {
pageno = pageno < 1 ? 1 : pageno;
super.pageno = pageno;
this.totalsum = totalsum;
this.url = url;
this.pagesize = pagesize;
}
public variablepage(int pagenum, int totalsum, string url) {
pagenum = pagenum < 1 ? 1 : pagenum;
super.pageno = pagenum;
this.totalsum = totalsum;
this.url = url;
}
public string getsplit() {
return split;
}
public void setsplit(string split) {
this.split = split;
}
}
#需要使用该分页标签的jsp 使用方法如下：
jsp 头部引入
<%@taglib uri="http://www.kevin.com/taglibs/page" prefix="page" %>
使用以下标签生成分页html代码
<page:htmlpage pageno="${pageno}" url="your_url" totalsum="${totalsum}" showpage="10" pagesize="12"/>
更多jsp自定义分页标签tag全过程。