自定义分页标签实现

分页标签如下：
package com.sz.kcygl.web.tag;

import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

import com.sz.kcygl.common.constants.KcyglConstants;
import com.sz.kcygl.common.util.Utils;


/**
* 分页标签
*/
public class PageSplitTag extends TagSupport {

private String url = ""; // 页面指向地址

private String pageNo = ""; // 当前页面，字符串型，由外面传入

private String paramsStr = ""; // 组装后的参数字符串

private int totalPages = 1; // 总页面数

private int count = 0; // 总记录数

private int intPageNo = 1; // 当前页面

private String type ;

private int pageSize = KcyglConstants.PAGE_SIZE_DEFAULT; // 每一页面显示的最大记录数

public PageSplitTag() {
}

public int doStartTag() throws JspException {
if (url == null) {
url = "";
}
url = url.trim();

HttpServletRequest request = (HttpServletRequest) pageContext
.getRequest();
Enumeration en = request.getParameterNames();
StringBuffer param = new StringBuffer();
while (en.hasMoreElements()) {
String key = (String) en.nextElement();
if ("pageNo".equals(key) || key.toLowerCase().startsWith("submit")||"pageSize".equals(key))
continue;
String value = Utils.trim(request.getParameter(key));
if (value.equals(""))
continue;
param.append("&" + key + "=" + Utils.encodeStr(value));
}
paramsStr = param.toString();

try {
intPageNo = Utils.parseInt(pageNo, 1);
if(intPageNo<1){
intPageNo = 1;
}
} catch (Exception e) {
}
if (count % pageSize > 0) {
totalPages = count / pageSize + 1;
} else {
totalPages = count / pageSize;
}
if (intPageNo > totalPages) {
intPageNo = totalPages;
}
return (SKIP_BODY);
}

public int doEndTag() throws JspException {
StringBuffer reStr = new StringBuffer();
reStr.append("<div class='scrollpage'>");
reStr.append("<form name='splitPageForm' id='splitPageForm' method='post' ");
reStr.append("action='" + url + addParams(paramsStr) + "'>");

reStr.append("<ul class='page_btn'>");

if (totalPages < 2) {
reStr.append("<li class='ini_un'><a href='javascript:void(0)'></a></li>");
reStr.append("<li class='pre_un'><a href='javascript:void(0)'></a></li>");
reStr.append("<li>"+intPageNo+"/"+totalPages+"</li>");
reStr.append("<li class='next_un'><a href='javascript:void(0)'></a></li>");
reStr.append("<li class='end_un'><a href='javascript:void(0)'></a></li>");
} else {
if (intPageNo < 2) {
reStr.append("<li class='ini_un'><a href='javascript:void(0)'></a></li>");
reStr.append("<li class='pre_un'><a href='javascript:void(0)'></a></li>");
reStr.append("<li>"+intPageNo+"/"+totalPages+"</li>");
reStr.append(getUrl(intPageNo + 1, "next"));
reStr.append(getUrl(totalPages, "end"));
} else if (intPageNo == totalPages) {
reStr.append(getUrl(1, "ini"));
reStr.append(getUrl(intPageNo - 1, "pre"));
reStr.append("<li>"+intPageNo+"/"+totalPages+"</li>");
reStr.append("<li class='next_un'><a href='javascript:void(0)'></a></li>");
reStr.append("<li class='end_un'><a href='javascript:void(0)'></a></li>");
} else {
reStr.append(getUrl(1, "ini"));
reStr.append(getUrl(intPageNo - 1, "pre"));
reStr.append("<li>"+intPageNo+"/"+totalPages+"</li>");
reStr.append(getUrl(intPageNo + 1, "next"));
reStr.append(getUrl(totalPages, "end"));
}
}
reStr.append("</ul>");

reStr.append("<ul class='page_num'>");
reStr.append("<li><input class='bottom_btn' name='' type='button' value=' Go ' onclick=\"addCookie('pageSize',document.getElementById('pageSize').value,720); document.getElementById('splitPageForm').submit();\" /></li>");
reStr.append("<li> <span>跳转至</span><input style='vertical-align:center;' size='2' name='pageNo' type='text' /><span>页</span> <span>每页</span><input size='2' style='vertical-align:center;' name='pageSize' id='pageSize' type='text' value='"+pageSize+"' /><span>条</span></li>");
reStr.append("<li>共"+count+"条匹配记录</li>");
reStr.append("</ul");

reStr.append("</form></div>");
JspWriter writer = pageContext.getOut();
try {
writer.println(new String(reStr.toString().getBytes()));
} catch (Exception e) {
throw new JspException(e.getMessage());
}
return (EVAL_PAGE);
}

private String getUrl(int pageNo, String name) {
return "<li class='"+name+"'><a href='" + dealUrl(url, pageNo)
+ "'></a></li>";
}

private String dealUrl(String url, int pageNo) {
return url + "?pageNo=" + pageNo +"&pageSize="+pageSize+ paramsStr;
}

private String addParams(String params) {
if (params == null || params.equals("")) {
return "";
}
return "?" + params.substring(1);
}

public void release() {
super.release();
}

public void setPageNo(String pageNo) {
this.pageNo = pageNo;
}

public void setCount(int count) {
this.count = count;
}

public void setUrl(String url) {
this.url = url;
}

public String getType() {
return type;
}

public void setType(String type) {
this.type = type;
}

public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}

}
分页用到的两个实体对象：
package com.sz.kcygl.common.page;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;


public class PageList<T> implements Serializable {

public PageList() {

}

public PageList(PageProperty pp, int allCount, List<T> list) {
if(pp.getNpage()>0){
this.page = pp.getNpage();
}
if(pp.getNpagesize()>0){
this.pageSize = pp.getNpagesize();
}
this.totalRecords = allCount;
if (totalRecords % pageSize > 0) {
this.totalPages = totalRecords / pageSize + 1;
} else {
this.totalPages = totalRecords / pageSize;
}
this.setRecords(list);
}

private int page = 1;

private int totalRecords;

private int totalPages;

private int pageSize = 20;

private int numbersPerBlock = 10;

private List<T> records = new ArrayList<T>();

public List<T> getRecords() {
return records;
}

public void setRecords(List<T> records) {
this.records = records;
}

public int getPage() {
return page;
}

public void setPage(int page) {
if (page < 1)
page = 1;
this.page = page;
}

public int getPageNumber() {
int pageNumber = 0;
if (totalRecords % pageSize == 0)
pageNumber = totalRecords / pageSize;
else
pageNumber = 1 + totalRecords / pageSize;

return pageNumber;
}

public int getPageSize() {
return pageSize;
}

public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}

public int getTotalRecords() {
return totalRecords;
}

public void setTotalRecords(int totalRecords) {
this.totalRecords = totalRecords;
}

/**
* first row count of current page, start from 1
*
* @return
*/
public int getFirstRow() {
return (page - 1) * pageSize + 1;
}

/**
* last row count of current page
*
* @return
*/
public int getLastRow() {
return page == getPageNumber() ? getTotalRecords() : page * pageSize;
}

public int getPreviousPage() {
return page > 1 ? page - 1 : page;
}

public int getNextPage() {
return page < getPageNumber() ? page + 1 : page;
}

public int getBlocks() {
if (this.getPageNumber() % this.numbersPerBlock == 0) {
return this.getPageNumber() / this.numbersPerBlock;
} else {
return 1 + this.getPageNumber() / this.numbersPerBlock;
}
}

public int getBlock() {
if (this.getPage() % this.numbersPerBlock == 0) {
return this.getPage() / this.numbersPerBlock;
} else {
return 1 + this.getPage() / this.numbersPerBlock;
}
}

public int getNumbersPerBlock() {
return numbersPerBlock;
}

public void setNumbersPerBlock(int numberPerBlock) {
this.numbersPerBlock = numberPerBlock;
}

public int getPageOfPrevBlock() {
if (this.getBlock() > 1) {
return (this.getBlock() - 1) * this.getNumbersPerBlock();
} else {
return 1;
}
}

public int getPageOfNextBlock() {
if (this.getBlock() < this.getBlocks()) {
return this.getBlock() * this.getNumbersPerBlock() + 1;
} else {
return this.getTotalRecords();
}
}

public int getTotalPages() {
return totalPages;
}

public void setTotalPages(int totalPages) {
this.totalPages = totalPages;
}
}


package com.sz.kcygl.common.page;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class PageProperty {

private int npage;//页码
private int nfirstindex;//查询起点
private int npagesize;//查询数量，0表示全部
private String searchString;//查询条件 where field=?
private String orderString;//排序条件 order by id desc
private List parameterList;// 查询条件参数列表
private HashMap paramMap; //参数map

public PageProperty(int page, int pagesize,String searchString, String orderString){
this.npagesize = pagesize;
this.npage = page;
this.searchString = searchString;
this.orderString = orderString;
}
public PageProperty(){
this.npage=1;
this.npagesize = 10;
this.nfirstindex = 0;
this.searchString = "";
this.orderString = "";
}

public int getNfirstindex() {
nfirstindex=(npage-1)*npagesize;
return nfirstindex;
}

public void setNfirstindex(int nfirstindex) {
this.nfirstindex = nfirstindex;
}

public int getNpagesize() {
return npagesize;
}

public void setNpagesize(int npagesize) {
this.npagesize = npagesize;
}

public String getOrderString() {
return orderString;
}

public void setOrderString(String orderString) {
this.orderString = orderString;
}

public String getSearchString() {
return searchString;
}

public void setSearchString(String searchString) {
this.searchString = searchString;
}
public List getParameterList() {
return parameterList;
}
public void setParameterList(List parameterList) {
this.parameterList = parameterList;
}
public void addParamter(Object o){//增加参数
initParameterList();
parameterList.add(o);
}
public void addParamter(int index,Object o){ //增加参数
initParameterList();
parameterList.add(index,o);
}
public void clearParamter(){ //增加参数
initParameterList();
parameterList.clear();
}
public void initParameterList(){//初始化参数列表
if(parameterList==null){
parameterList=new ArrayList();
}
}
public int getNpage() {
return npage;
}
public void setNpage(int page) {
npage = page;
}


public HashMap getParamMap() {
initParamMap();
return paramMap;
}

public void putParamMap(String name,Object o){ //增加参数
initParamMap();
paramMap.put(name,o);
}
public void clearParamMap(){ //增加参数
initParamMap();
paramMap.clear();
}
public void initParamMap(){//初始化参数列表
if(paramMap==null){
paramMap=new HashMap();
}
}

public int getPageStart(){
return (npage - 1)*npagesize;
}

public int getPageEnd(){
return npage*npagesize;
}

}
tld文件：
<?xml version="1.0" encoding="UTF-8"?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
version="2.0">

<description>kcygl tags</description>
<tlib-version>1.0</tlib-version>
<short-name>kcygl</short-name>

<tag>
<name>pageSplit</name>
<tag-class>com.sz.kcygl.web.tag.PageSplitTag</tag-class>
<body-content>empty</body-content>
<attribute>
<name>pageNo</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>count</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>url</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>params</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>type</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>pageSize</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>

<tag>
<name>columnSort</name>
<tag-class>com.sz.kcygl.web.tag.ColumnSortTag</tag-class>
<body-content>empty</body-content>
<attribute>
<name>url</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>column</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>columnShowName</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>sortType</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>sortColumn</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>