JSP custom tab TAG whole process _jsp programming

First we need to create a page.tld file in the web-inf/tld/directory

<?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; /** * Paging Label * * @description * @DATE 2012-3-11 PM 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; 
The public void Setpageno (int pageno) {This.pageno = PageNo; 
public int getpagesize () {return pageSize; 
The public void setpagesize (int pageSize) {this.pagesize = pageSize; 
public int gettotalsum () {return totalSum; 
The 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;//does not show paging} 
else if (PageSize > TotalSum) {return tagsupport.skip_body;//does not display the paging} jspwriter out = Pagecontext.getout (); try {if (Url.indexof ("; jsessionid=") = = 1) {if (Url.indexof ("?") = = 1) {url = = '; jsessionid= ' + pagecontext.getses 
Sion (). 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 Pagination class * * @description * @DATE 2012-3-11 PM 10:33:14 * * public class HtmlPage extends Page {public Htmlpag 
E (Variablepage variablepage) {super (variablepage); 
public string pagination () {String printno = ""; If the page is paginated and the number of pages is less than equal to the number of pages to display if (Variablepage.totalpage > 1 && variablepage.totalpage <= 
Variablepage.showpagenum) {return displayall (); If pagination: greater than the number of pages displayed} else if (Variablepage.totalpage > 1 && variablepage.totalpage > Variablepage.showpagenu 
m) {if (Variablepage.pageno = 1) {//Current page equals first page return Fromfirstpageprint (); 
else if (Variablepage.pageno = = variablepage.totalpage) {//current page equals last page return Fromlastpageprint (); else {//If the current page: that is not the homepage nor the last if (variablepage.showpagenum% 2 = 0) {//You can split the number 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$no); i++) {if (i = = Variablepage.pageno) {//If is current page: Do not add a connection 
URL Printno + + (i + variablepage.split); 
else {Printno + = (Builda (variablepage, i) + variablepage.split); 
else {return fromfirstpageprint ()}}} 
} else {//printed page number is not even: int print$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) {//If is current page: do not add connection u 
RL Printno + + (i + variablepage.split); 
else {Printno + = (Builda (variablepage, i) + variablepage.split); 
' Else if ' (Variablepage.pageno <= print$no) {//return from the first page fromfirstpageprint (); 
else {return fromlastpageprint (); 
}} return (PRINTNO); 
else {return "1"; }} PubLic String Getbackpagenum () {if (Variablepage.pageno <= 1) {return Buildspan ("Previous page", Variablepage); 
else {return Builda ("prev", (Variablepage.url + (variablepage.pageno-1))); } public String Getnextpagenum () {if (Variablepage.pageno >= variablepage.totalpage) {return Buildspan ("next page") 
Variablepage); 
else {return Builda ("Next page", Variablepage.url + (Variablepage.pageno + 1)); } public string Buildspan (string text, Variablepage variablepage) {return "<span style=\" color:gray;\ ">" + te 
XT + "</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 ("Previous page", Variablepage); 
else {return Builda ("prev", Variablepage.geturl () + (variablepage.pageno-1)); } public String Getnextpagenum () {if (Variablepage.pageno >= variablepage.totalpage) {return Buildspan ("next page") 
Variablepage); 
else {return Builda ("Next page", Variablepage.geturl () + (Variablepage.pageno + 1)); }/** * Calculate total pages */private void Calculatetotalpage () {if (variablepage.totalsum% variablepage.pagesize = = 0) {V 
Ariablepage.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 (); 

/** * Abstracts out Pagination Method * * @return/public abstract String pagination (); /** * Implementation starts with the first page * * @return/protected final String Fromfirstpageprint () {StringBuffer buffer = new StringBuffer 
(100); for (int i = 1; I <= variablepage.showpagenum i++) {if (i = = Variablepage.pageno) {//If is current page: Do not add connection URL Buffer.append 
(i + variablepage.split); 
else {buffer.append (Builda (variablepage, i) + variablepage.split); 
} return buffer.tostring (); /** * Implementation starts printing from last page * * @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) {//If is current page: Do not add a connection URL buffer. 
Append (i + variablepage.split); 
else {buffer.append (Builda (variablepage, i) + variablepage.split); 
} return buffer.tostring (); 
Public String Getfirstno () {if (Isexistspagination ()) {return Builda ("Home", Variablepage.url + 1); 
else {return Buildspan ("Home page", variablepage); }/** * To determine if there is a paging * * @return/private Boolean isexistspagination () {if (Variablepage.totalsum > 1 &AMP;&A mp 
Variablepage.totalpage > 1) {return true; 
return false; Public String Getlastno () {if (Isexistspagination ()) {return Builda ("Last", Variablepage.url + Variablepage.totalpag 
e); 
else {return Buildspan ("Last", 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 ("Each page <input type= ' text ' id= ' pageSize ' style= '" width:20px ' maxlength= ' 2 ' name= ' pageSize ' "); 
if (pagesize>0) {builder.append ("value= '" +pagesize+ ""); 
} builder.append ("/> Strip"); 
return builder.tostring (); } 
}

/** * Paging Base variable * * @description * @DATE 2012-3-11 PM 10:34:00/public class Simplevariable {/** * Show page number/Protec 
Ted int showpagenum = 10; 
/** * Connection URL */protected String URL = null; 
/** * Current page number/protected int pageno = 1; 
/** * Total page number/protected int totalpage = 1; 
/** * Total number of strips/protected int totalSum = 0; 

/** * Each page shows the number of bars */protected int pageSize = 10; 
Public String GetUrl () {return URL; 
public void SetUrl (String url) {this.url = URL; 
public int gettotalpage () {return totalpage; 
The public void settotalpage (int totalpage) {this.totalpage = Totalpage; 
public int gettotalsum () {return totalSum; 
The public void settotalsum (int totalSum) {this.totalsum = TotalSum; 
public int getpagesize () {return pageSize; 
The public void setpagesize (int pageSize) {this.pagesize = pageSize; 
public int Getshowpagenum () {return showpagenum; 
The public void setshowpagenum (int showpagenum) {this.showpagenum = Showpagenum; } public INT Getpageno () {return pageno; 
The public void Setpageno (int pageno) {This.pageno = PageNo;  } 
}

/** * Paging 
variable * 
@description 
* @DATE 2012-3-11 pm 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 use the following methods:

JSP Head Introduction

<% @taglib uri= "http://www.kevin.com/taglibs/page" prefix= "page"%>

Use the following label raw page HTML code

<page:htmlpage pageno= "${pageno}" url= "Your_url" totalsum= "${totalsum}" "Showpage=" pagesize= "/>"