Struts2分页-自定义标签-类似百度分页
备份一下，以后继续学习
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1.类似百度的数字分页
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?2.首页、上一页、下一页、末页
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我做的例子是Eclipse环境下的
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这是我的结构图:
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以下是代码:
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?1 . web.xml
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<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <filter><filter-name>struts2</filter-name><filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class></filter><filter-mapping><filter-name>struts2</filter-name><url-pattern>/*</url-pattern></filter-mapping><jsp-config><taglib><taglib-uri>/WEB-INF/struts-tags.tld</taglib-uri><taglib-location>/WEB-INF/struts-tags.tld</taglib-location></taglib></jsp-config> </web-app>
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?我自定义的tld文件
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2 . wangs.tld
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<?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>wangs</short-name><uri>/wangs</uri> <tag> <name>pages</name> <tag-class>com.wangs.tag.PageTag</tag-class> <body-content>empty</body-content> <attribute> <name>cpage</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>total</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>visitUrl</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>styleClass</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>theme</name> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag></taglib>
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3?.?struts-tags.tld? 从struts2-core-2.1.8.1.jar 中复制
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?4 . struts.xml
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<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN""http://struts.apache.org/dtds/struts-2.1.dtd"><struts><package name="TagDemo" namespace="/" extends="struts-default"><action name="list"method="execute"><result name="success">/list.jsp</result></action></package></struts>
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5 . PageTag.java Bean
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package com.wangs.tag;import com.opensymphony.xwork2.util.ValueStack;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts2.components.Component;import org.apache.struts2.views.jsp.ComponentTagSupport;/** * 分页标签 */public class PageTag extends ComponentTagSupport {private String cpage;private String total;private String visitUrl;private String styleClass;private String theme;public void setCpage(String cpage) {this.cpage = cpage;}public void setTotal(String total) {this.total = total;}public void setVisitUrl(String visitUrl) {this.visitUrl = visitUrl;}public void setStyleClass(String styleClass) {this.styleClass = styleClass;}public void setTheme(String theme) {this.theme = theme;}@Overridepublic Component getBean(ValueStack arg0, HttpServletRequest arg1,HttpServletResponse arg2) {return new Pages(arg0, arg1);}protected void populateParams() {super.populateParams();Pages pages = (Pages) component;pages.setCpage(cpage);pages.setTotal(total);pages.setVisitUrl(visitUrl);pages.setStyleClass(styleClass);pages.setTheme(theme);}}?
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6?. Pages.java 逻辑类
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package com.wangs.tag;import com.opensymphony.xwork2.util.ValueStack;import java.io.IOException;import java.io.Writer;import java.util.logging.Level;import java.util.logging.Logger;import javax.servlet.http.HttpServletRequest;import org.apache.struts2.components.Component;/** * 分页逻辑 */public class Pages extends Component {private HttpServletRequest request;private String cpage;private String total;private String visitUrl;private String styleClass;private String theme;public String getCpage() {return cpage;}public void setCpage(String cpage) {this.cpage = cpage;}public String getTotal() {return total;}public void setTotal(String total) {this.total = total;}public String getVisitUrl() {return visitUrl;}public void setVisitUrl(String visitUrl) {this.visitUrl = visitUrl;}public String getStyleClass() {return styleClass;}public void setStyleClass(String styleClass) {this.styleClass = styleClass;}public String getTheme() {return theme;}public void setTheme(String theme) {this.theme = theme;}public Pages(ValueStack arg0, HttpServletRequest request) {super(arg0);this.request = request;}@Overridepublic boolean start(Writer writer) {boolean result = super.start(writer);try {StringBuilder str = new StringBuilder();boolean isValid = true;// 从ValueStack中取出数值if (isValid) {if (total.startsWith("%{") && total.endsWith("}")) {total = total.substring(2, total.length() - 1);total = (String) this.getStack().findValue(total);isValid = total == null ? false : true;} else {isValid = false;}}if (isValid) {if (cpage.startsWith("%{") && cpage.endsWith("}")) {cpage = cpage.substring(2, cpage.length() - 1);cpage = (String) this.getStack().findValue(cpage);isValid = cpage == null ? false : true;} else {isValid = false;}}if (isValid) {if (visitUrl.startsWith("%{") && visitUrl.endsWith("}")) {visitUrl = visitUrl.substring(2, visitUrl.length() - 1);visitUrl = (String) this.getStack().findValue(visitUrl);isValid = visitUrl == null ? false : true;} else {isValid = false;}}if (isValid) {Integer cpageInt = Integer.valueOf(cpage);str.append("<span ");if (styleClass != null) {str.append(" class='" + styleClass + "'>");} else {str.append(">");}// 文本样式if (theme == null || "text".equals(theme)) {// 当前页与总页数相等if (cpage.equals(total)) {// 如果total = 1，则无需分页，显示“[第1页] [共1页]”if ("1".equals(total)) {str.append("[第 " + cpage + " 页]");str.append(" [共 " + total + " 页]");} else {// 到达最后一页,显示“[首页] [上一页] [末页]”str.append("<a href='");str.append(visitUrl);str.append("?cpage=1&total=" + total + "&visitUrl="+ visitUrl);str.append("'>[首页]</a> <a href='");str.append(visitUrl);str.append("?cpage=" + (cpageInt - 1) + "&total="+ total + "&visitUrl=" + visitUrl);str.append("'>[上一页]</a> <a href='");str.append(visitUrl);str.append("?cpage=" + total + "&total=" + total+ "&visitUrl=" + visitUrl);str.append("'>[末页]</a>");}} else {// 当前页与总页数不相同if ("1".equals(cpage)) {// 第一页，显示“[首页] [下一页] [末页]”str.append("<a href='");str.append(visitUrl);str.append("?cpage=1&total=" + total + "&visitUrl="+ visitUrl);str.append("'>[首页]</a> <a href='");str.append(visitUrl);str.append("?cpage=" + (cpageInt + 1) + "&total="+ total + "&visitUrl=" + visitUrl);str.append("'>[下一页]</a> <a href='");str.append(visitUrl);str.append("?cpage=" + total + "&total=" + total+ "&visitUrl=" + visitUrl);str.append("'>[末页]</a>");} else {// 不是第一页，显示“[首页] [上一页] [下一页] [末页]”str.append("<a href='");str.append(visitUrl);str.append("?cpage=1&total=" + total + "&visitUrl="+ visitUrl);str.append("'>[首页]</a> <a href='");str.append(visitUrl);str.append("?cpage=" + (cpageInt - 1) + "&total="+ total + "&visitUrl=" + visitUrl);str.append("'>[上一页]</a> <a href='");str.append(visitUrl);str.append("?cpage=" + (cpageInt + 1) + "&total="+ total + "&visitUrl=" + visitUrl);str.append("'>[下一页]</a> <a href='");str.append(visitUrl);str.append("?cpage=" + total + "&total=" + total+ "&visitUrl=" + visitUrl);str.append("'>[末页]</a>");}}} else if ("number".equals(theme)) { // 数字样式 [1 2 3 4 5 6 7 8 9// 10 > >>]Integer totalInt = Integer.valueOf(total);// 如果只有一页，则无需分页str.append("[ ");if (totalInt == 1) {str.append("<strong>1</strong> ");} else {// 计算一共分几组int group = (totalInt - 1) / 10 + 1;// 当前第几组int cgroup = (cpageInt - 1) / 10 + 1;if (cgroup > 1) {// 当前不是第一组，要显示“<< <”// <<：返回前一组第一页// <：返回前一页str.append("<a href='");str.append(visitUrl);str.append("?cpage=" + ((cgroup - 2) * 10 + 1)+ "&total=" + total + "&visitUrl=" + visitUrl);str.append("'>«</a> ");str.append("<a href='");str.append(visitUrl);str.append("?cpage=" + (cpageInt - 1) + "&total="+ total + "&visitUrl=" + visitUrl);str.append("'>‹</a> ");}// 10个为一组显示for (int i = (cgroup - 1) * 10 + 1; i <= totalInt&& i <= cgroup * 10; i++) {if (cpageInt == i) { // 当前页要加粗显示str.append("<strong>");}str.append("<a href='");str.append(visitUrl);str.append("?cpage=" + i + "&total=" + total+ "&visitUrl=" + visitUrl);str.append("'>" + i + "</a> ");if (cpageInt == i) {str.append("</strong>");}}// 如果多于1组并且不是最后一组，显示“> >>”if (group > 1 && cgroup != group) {// >>：返回下一组最后一页// >：返回下一页str.append("<a href='");str.append(visitUrl);str.append("?cpage=" + (cpageInt + 1) + "&total="+ total + "&visitUrl=" + visitUrl);str.append("'>›</a> ");str.append("<a href='");str.append(visitUrl);str.append("?cpage="+ ((cgroup * 10 + 10) > totalInt ? totalInt: (cgroup * 10 + 10)) + "&total="+ total + "&visitUrl=" + visitUrl);str.append("'>»</a> ");}}str.append("]");}str.append("</span>");}writer.write(str.toString());} catch (IOException ex) {Logger.getLogger(Pages.class.getName()).log(Level.SEVERE, null, ex);}return result;}}?
7 . DemoAction.java
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package action;import com.opensymphony.xwork2.Action;import com.opensymphony.xwork2.ActionSupport;public class DemoAction extends ActionSupport {private static final long serialVersionUID = 2120921059932936210L;private String cpage;private String total;private String visitUrl;public String execute() {// 测试地址:// (1).当前页第一页,共5页// http://localhost:8080/TagDemo/list?cpage=1&total=5&visitUrl=list// (2).当前页第一页,共18页// http://localhost:8080/TagDemo/list?cpage=1&total=18&visitUrl=listreturn Action.SUCCESS;}public String getCpage() {return cpage;}public void setCpage(String cpage) {this.cpage = cpage;}public String getTotal() {return total;}public void setTotal(String total) {this.total = total;}public String getVisitUrl() {return visitUrl;}public void setVisitUrl(String visitUrl) {this.visitUrl = visitUrl;}}?
8 . 页面 list.jsp
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<%@page contentType="text/html" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><%@ taglib prefix="wangs" uri="/WEB-INF/wangs.tld"%><%@ taglib prefix="s" uri="/WEB-INF/struts-tags.tld"%><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <link href="css/style.css" rel="stylesheet" type="text/css"/> <title>List</title> </head> <body> 共 <s:property value="total"/> 页 第 <s:property value="cpage"/> 页<br><br> <wangs:pages cpage="%{cpage}" total="%{total}" visitUrl="%{visitUrl}" styletheme="text"/> </body></html>?
theme 控制分页的形式：1.类似百度的数字分页? 2.[ 首页 下一页 末页 ] 的文字分页
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参考一:?? http://tangshuo.iteye.com/blog/189447
参考二:?? http://tangshuo.iteye.com/blog/189820