标签文件(放到WEB-INF目录下):
标签类:
分页逻辑处理类:
jsp文件:
其中totalPage和currentPage需要在action中设置。
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd"> <taglib> <tlib-version>2.2.3</tlib-version> <jsp-version>1.2</jsp-version> <short-name>pageTag</short-name> <uri>/pageTag</uri> <display-name>"pageTag"</display-name> <description><![CDATA[用于jsp文件中的分页功能]]></description> <tag> <name>pages</name> <tag-class>kaiqi.helpu.common.PageTag</tag-class> <body-content>JSP</body-content> <description><![CDATA[分页标签,只负责显示分页]]></description> <attribute> <name>currentPage</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <description><![CDATA[当前页]]></description> </attribute> <attribute> <name>totalPage</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <description><![CDATA[总页数]]></description> </attribute> <attribute> <name>url</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <description><![CDATA[请求的url地址]]></description> </attribute> <attribute> <name>cssClass</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <description><![CDATA[CSS的样式类名]]></description> </attribute> <attribute> <name>currentCssClass</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <description><![CDATA[当前页CSS的样式类名]]></description> </attribute> <attribute> <name>showPageNumber</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <description><![CDATA[分页时需要显示的数字页码个数]]></description> </attribute> <attribute> <name>firstPage</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <description><![CDATA[第一页]]></description> </attribute> <attribute> <name>endPage</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <description><![CDATA[最后页]]></description> </attribute> <attribute> <name>prePage</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <description><![CDATA[下一页]]></description> </attribute> <attribute> <name>nextPage</name> <required>false</required> <rtexprvalue>true</rtexprvalue> <description><![CDATA[上一页]]></description> </attribute> </tag> </taglib>
标签类:
/** * 分页标签 * */ public class PageTag extends ComponentTagSupport { private String currentPage = "1"; // 当前页 private String totalPage = "1"; // 总页数 private String url; // 请求地址 private String cssClass = "pagination"; // CSS样式类 private String currentCssClass = "current"; //当前页的CSS样式 private String showPageNumber = "5"; // 需要显示的页码数 // 指定首页,末页,上一页,下一页在页面上显示时的字符串 private String firstPage = "第一页"; private String endPage = "最后页"; private String prePage = "<<"; private String nextPage = ">>"; public void setCurrentPage(String currentPage) { this.currentPage = currentPage; } public void setTotalPage(String totalPage) { this.totalPage = totalPage; } public void setUrl(String url) { this.url = url; } public void setCssClass(String cssClass) { this.cssClass = cssClass; } public void setShowPageNumber(String showPageNumber) { this.showPageNumber = showPageNumber; } public void setFirstPage(String firstPage) { this.firstPage = firstPage; } public void setEndPage(String endPage) { this.endPage = endPage; } public void setPrePage(String prePage) { this.prePage = prePage; } public void setNextPage(String nextPage) { this.nextPage = nextPage; } public void setCurrentCssClass(String currentCssClass) { this.currentCssClass = currentCssClass; } @Override public Component getBean(ValueStack arg0, HttpServletRequest arg1, HttpServletResponse arg2) { return new PageManage(arg0); // 返回Pages Component,分页的逻辑处理都在这个Component中 } // 获得参数 protected void populateParams() { super.populateParams(); PageManage pages = (PageManage) component; pages.setCssClass(cssClass); pages.setCurrentCssClass(currentCssClass); pages.setCurrentPage(currentPage); pages.setShowPageNumber(showPageNumber); pages.setTotalPage(totalPage); pages.setUrl(url); pages.setFirstPage(firstPage); pages.setEndPage(endPage); pages.setNextPage(nextPage); pages.setPrePage(prePage); } }
分页逻辑处理类:
/** * * 分页逻辑 * */ public class PageManage extends Component { private String currentPage; private String totalPage; private String url; private String cssClass; private String currentCssClass; private String showPageNumber; private String firstPage; private String endPage; private String prePage; private String nextPage; public String getCurrentPage() { return currentPage; } public void setCurrentPage(String currentPage) { this.currentPage = currentPage; } public void setCurrentCssClass(String currentCssClass) { this.currentCssClass = currentCssClass; } public String getTotalPage() { return totalPage; } public void setTotalPage(String totalPage) { this.totalPage = totalPage; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } public String getCssClass() { return cssClass; } public void setCssClass(String cssClass) { this.cssClass = cssClass; } public String getShowPageNumber() { return showPageNumber; } public void setShowPageNumber(String showPageNumber) { this.showPageNumber = showPageNumber; } public void setFirstPage(String firstPage) { this.firstPage = firstPage; } public void setEndPage(String endPage) { this.endPage = endPage; } public void setPrePage(String prePage) { this.prePage = prePage; } public void setNextPage(String nextPage) { this.nextPage = nextPage; } public PageManage(ValueStack arg0) { super(arg0); } @Override public boolean start(Writer writer) { boolean result = super.start(writer); totalPage = parse(totalPage); currentPage = parse(currentPage); cssClass = parse(cssClass); currentCssClass = parse(currentCssClass); showPageNumber = parse(showPageNumber); endPage = parse(endPage); firstPage = parse(firstPage); prePage = parse(prePage); nextPage = parse(nextPage); return result; } private String parse(String value) { String actualValue = null; if (altSyntax()) { if (value.startsWith("%{") && value.endsWith("}")) { value = value.substring(2, value.length() - 1); } } actualValue = (String) getStack().findValue(value, String.class); if(actualValue == null) { actualValue = value; } return actualValue; } @Override public boolean end(Writer writer, String body) { try { StringBuilder outputStringBuilder = new StringBuilder(); StringBuilder paramStringBuilder = new StringBuilder(); boolean isValid = true; // 从ValueStack中取出数值 if (isValid) { Set<String> keys = getParameters().keySet(); for (String key : keys) { paramStringBuilder.append("&"); paramStringBuilder.append(key); paramStringBuilder.append("="); //转换编码,否则会出现乱码 paramStringBuilder.append(java.net.URLEncoder.encode(getParameters().get(key).toString(),"utf-8")); } } if (isValid) { Integer currentPageInt = Integer.valueOf(currentPage); Integer totalPageInt = Integer.valueOf(totalPage); Integer showPageNumberInt = Integer.valueOf(showPageNumber); String current = ""; String param = paramStringBuilder.toString(); if (totalPageInt != 0) { if (totalPageInt <= showPageNumberInt) { // 总的页数小于可以被显示的页码数 if (currentPage.equals(totalPage)) { // 当前页等于总数页 if ("1".equals(totalPage)) { // 如果totalPage = 1,则无需分页,不显示分页信息 } else { // 总数页大于1 outputStringBuilder.append("<ol class='" + cssClass + "'>"); outputStringBuilder.append("<li>"); outputStringBuilder.append("<a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=1" + param); outputStringBuilder.append("'>" + firstPage + "</a></li><li><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + (currentPageInt - 1) + param); outputStringBuilder.append("'>" + prePage + "</a></li>"); for (int i = 1; i <= totalPageInt; i++) { current = ""; if (i == currentPageInt) { current = " class='"+currentCssClass+"' "; } outputStringBuilder.append("<li" + current + "><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + i + param); outputStringBuilder.append("'>" + i + "</a></li>"); } outputStringBuilder.append("</ol>"); } } else { // 当前页不等于总数页 if ("1".equals(currentPage)) { // 当前页为第一页 outputStringBuilder.append("<ol class='" + cssClass + "'>"); for (int i = 1; i <= totalPageInt; i++) { current = ""; if (i == currentPageInt) { current = " class='"+currentCssClass+"' "; } outputStringBuilder.append("<li" + current + "><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + i + param); outputStringBuilder.append("'>" + i + "</a></li>"); } outputStringBuilder.append("<li><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + (currentPageInt + 1) + param); outputStringBuilder.append("'>" + nextPage + "</a></li><li> <a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + totalPage + param); outputStringBuilder.append("'>" + endPage + "</a></li></ol>"); } else { // 当前页不为第一页 outputStringBuilder.append("<ol class='" + cssClass + "'>"); outputStringBuilder.append("<li>"); outputStringBuilder.append("<a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=1" + param); outputStringBuilder.append("'>" + firstPage + "</a></li><li><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + (currentPageInt - 1) + param); outputStringBuilder.append("'>" + prePage + "</a></li>"); for (int i = 1; i <= totalPageInt; i++) { current = ""; if (i == currentPageInt) { current = " class='"+currentCssClass+"' "; } outputStringBuilder.append("<li" + current + "><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + i + param); outputStringBuilder.append("'>" + i + "</a></li>"); } outputStringBuilder.append("<li><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + (currentPageInt + 1) + param); outputStringBuilder.append("'>" + nextPage + "</a></li><li> <a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + totalPage + param); outputStringBuilder.append("'>" + endPage + "</a></li></ol>"); } } } else { // 总页数大于可以显示的页码数 if (currentPage.equals(totalPage)) { // 当前页等于最后页 outputStringBuilder.append("<ol class='" + cssClass + "'>"); outputStringBuilder.append("<li>"); outputStringBuilder.append("<a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=1" + param); outputStringBuilder.append("'>" + firstPage + "</a></li><li><a href='"); outputStringBuilder.append(url); if((totalPageInt % showPageNumberInt) == 0) {//最后一页显示了showPageNumberInt条 outputStringBuilder.append("?" + "currentPage=" + (totalPageInt-showPageNumberInt) +param); } else {//最后一页显示了不到showPageNumberInt条 outputStringBuilder.append("?" + "currentPage=" + (totalPageInt-(totalPageInt %showPageNumberInt)) +param); } outputStringBuilder.append("'>" + prePage + "</a></li>"); /*显示可见页*/ if((totalPageInt % showPageNumberInt) == 0) { for (int i = totalPageInt - showPageNumberInt +1; i <= totalPageInt; i++) { current = ""; if (i == currentPageInt) { current = " class='"+currentCssClass+"' "; } outputStringBuilder.append("<li" + current + "><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + i + param); outputStringBuilder.append("'>" + i + "</a></li>"); } outputStringBuilder.append("</ol>"); } else { for (int i = totalPageInt - totalPageInt % showPageNumberInt +1; i <= totalPageInt; i++) { current = ""; if (i == currentPageInt) { current = " class='"+currentCssClass+"' "; } outputStringBuilder.append("<li" + current + "><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + i + param); outputStringBuilder.append("'>" + i + "</a></li>"); } outputStringBuilder.append("</ol>"); } } else if(currentPage.equals("1")) { // 当前页为第一页 outputStringBuilder.append("<ol class='" + cssClass + "'>"); for (int i = 1; i <= showPageNumberInt; i++) { current = ""; if (i == currentPageInt) { current = " class='"+currentCssClass+"' "; } outputStringBuilder.append("<li" + current + "><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + i + param); outputStringBuilder.append("'>" + i + "</a></li>"); } outputStringBuilder.append("<li><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + (1 + showPageNumberInt) + param); outputStringBuilder.append("'>" + nextPage + "</a></li><li> <a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + totalPage + param); outputStringBuilder.append("'>" + endPage + "</a></li></ol>"); } else if((currentPageInt - showPageNumberInt ) < 1) {//当前页在第一大页中 outputStringBuilder.append("<ol class='" + cssClass + "'>"); outputStringBuilder.append("<li>"); outputStringBuilder.append("<a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=1" + param); outputStringBuilder.append("'>" + firstPage + "</a></li><li><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + (currentPageInt - 1) + param); outputStringBuilder.append("'>" + prePage + "</a></li>"); /*显示可见页*/ for (int i = 1; i <= showPageNumberInt; i++) { current = ""; if (i == currentPageInt) { current = " class='"+currentCssClass+"' "; } outputStringBuilder.append("<li" + current + "><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + i + param); outputStringBuilder.append("'>" + i + "</a></li>"); } outputStringBuilder.append("<li><a href='"); outputStringBuilder.append(url); /*显示下一大页*/ if((currentPageInt % showPageNumberInt) == 0) {//当前页为该大页(第一大页)最后一页 outputStringBuilder.append("?" + "currentPage=" + (currentPageInt + 1) + param); } else {//当前页不为该大页(第一大页)最后一页 outputStringBuilder.append("?" + "currentPage=" + (currentPageInt + (showPageNumberInt- currentPageInt % showPageNumberInt)+ 1) + param); } outputStringBuilder.append("'>" + nextPage + "</a></li><li> <a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + totalPage + param); outputStringBuilder.append("'>" + endPage + "</a></li></ol>"); } else if ((currentPageInt - showPageNumberInt ) >= 1 && (currentPageInt + showPageNumberInt ) <= totalPageInt) {//当前页不在第一大页也不在最后一大页中 outputStringBuilder.append("<ol class='" + cssClass + "'>"); outputStringBuilder.append("<li>"); outputStringBuilder.append("<a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=1" + param); outputStringBuilder.append("'>" + firstPage + "</a></li><li><a href='"); outputStringBuilder.append(url); /*显示前一大页*/ if((currentPageInt % showPageNumberInt) == 0) {//当前页为该大页最后一页 outputStringBuilder.append("?" + "currentPage=" + (currentPageInt - showPageNumberInt) + param); } else {//当前页不为该大页最后一页 outputStringBuilder.append("?" + "currentPage=" + ((currentPageInt - (currentPageInt % showPageNumberInt))) + param); } outputStringBuilder.append("'>" + prePage + "</a></li>"); if((currentPageInt % showPageNumberInt)!= 0) { //当前页不为该大页最后一页 /*显示可见页*/ for (int i = currentPageInt + (showPageNumberInt-currentPageInt % showPageNumberInt) + 1 - showPageNumberInt; i < currentPageInt + (showPageNumberInt-currentPageInt % showPageNumberInt) + 1; i++) { current = ""; if (i == currentPageInt) { current = " class='"+currentCssClass+"' "; } outputStringBuilder.append("<li" + current + "><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + i + param); outputStringBuilder.append("'>" + i + "</a></li>"); } /*显示下一大页*/ outputStringBuilder.append("<li><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + (currentPageInt + (showPageNumberInt-currentPageInt % showPageNumberInt) + 1) + param); outputStringBuilder.append("'>" + nextPage + "</a></li><li> <a href='"); /*显示最后一页*/ outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + totalPage + param); outputStringBuilder.append("'>" + endPage + "</a></li></ol>"); }else { //当前页为该大页最后一页 for (int i = currentPageInt - showPageNumberInt + 1; i <= currentPageInt ; i++) { //显示可见页 current = ""; if (i == currentPageInt) { current = " class='"+currentCssClass+"' "; } outputStringBuilder.append("<li" + current + "><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + i + param); outputStringBuilder.append("'>" + i + "</a></li>"); } outputStringBuilder.append("<li><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + (currentPageInt + 1) + param); outputStringBuilder.append("'>" + nextPage + "</a></li><li> <a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + totalPage + param); outputStringBuilder.append("'>" + endPage + "</a></li></ol>"); } } else if ((totalPageInt - currentPageInt ) < showPageNumberInt) { //当前页在最后一大页中 outputStringBuilder.append("<ol class='" + cssClass + "'>"); outputStringBuilder.append("<li>"); outputStringBuilder.append("<a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=1" + param); outputStringBuilder.append("'>" + firstPage + "</a></li><li><a href='"); outputStringBuilder.append(url); /*显示前一大页*/ if((currentPageInt % showPageNumberInt) == 0) {//当前页为该大页(最后一大页)最后一页 outputStringBuilder.append("?" + "currentPage=" + (currentPageInt - showPageNumberInt) + param); } else {//当前页不为该大页(最后一大页)最后一页 outputStringBuilder.append("?" + "currentPage=" + ((currentPageInt - (currentPageInt % showPageNumberInt))) + param); } outputStringBuilder.append("'>" + prePage + "</a></li>"); if((currentPageInt % showPageNumberInt)!= 0) { //当前页不为该大页(最后一大页)的最后一页 /*显示可见页*/ for (int i = currentPageInt + (showPageNumberInt-currentPageInt % showPageNumberInt) + 1 - showPageNumberInt; i < totalPageInt+1; i++) { current = ""; if (i == currentPageInt) { current = " class='"+currentCssClass+"' "; } outputStringBuilder.append("<li" + current + "><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + i + param); outputStringBuilder.append("'>" + i + "</a></li>"); } } else { //当前页为该大页最后一页 for (int i = currentPageInt - showPageNumberInt + 1; i <= currentPageInt ; i++) { //显示可见页 current = ""; if (i == currentPageInt) { current = " class='"+currentCssClass+"' "; } outputStringBuilder.append("<li" + current + "><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + i + param); outputStringBuilder.append("'>" + i + "</a></li>"); } } /*显示下一页*/ outputStringBuilder.append("<li><a href='"); outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + (currentPageInt + 1) + param); outputStringBuilder.append("'>" + nextPage + "</a></li><li> <a href='"); /*显示最后一页*/ outputStringBuilder.append(url); outputStringBuilder.append("?" + "currentPage=" + totalPage + param); outputStringBuilder.append("'>" + endPage + "</a></li></ol>"); } } } } writer.write(outputStringBuilder.toString()); } catch (IOException e) { Logger.getLogger(PageManage.class.getName()).log(Level.SEVERE, null, e); } return super.end(writer, body); } }
jsp文件:
<%@ taglib prefix="p" uri="/pageTag"%> <p:pages currentPage="%{currentPage}" showPageNumber="3" totalPage="%{totalPage}" url="xxx.action" currentCssClass="current"> <s:param name="condition" value="condition"></s:param> </p:pages>
其中totalPage和currentPage需要在action中设置。
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本文将详细介绍如何在Struts2中实现分页标签,并提供一个简洁易懂的项目示例。 1. **Struts2分页概念**: 分页是将大量数据分割成若干小块,每次只加载一部分数据到页面上,使得用户可以逐页浏览,减轻服务器压力...