通过本文主要向大家介绍了jsp tag,unknown tag jsp,jsp tag文件,jsp中tag,jsp tag lib等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
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;
}
</div>
/**
* 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>");
}
}
</div>
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.