Customize tag lib 2

来源：互联网发布：淘宝代理招聘编辑：程序博客网时间：2024/05/18 03:45

We also can customize the tag lib using component class, here are the steps:

1. Define the component

package com.stefli.core.component.taglib;import java.io.IOException;import java.io.Writer;import javax.servlet.http.HttpServletRequest;import org.apache.struts2.components.Component;import com.opensymphony.xwork2.util.ValueStack;public class TMSDatagridComponent extends Component {protected HttpServletRequest request;protected String title;protected String url;protected String css;public TMSDatagridComponent(ValueStack stack, HttpServletRequest request) {super(stack);this.request = request;}public void setTitle(String title) {this.title = title;}public void setUrl(String url) {this.url = url;}public void setCss(String css) {this.css = css;}public boolean start(Writer writer) {try {String ctx = request.getContextPath();StringBuffer script = new StringBuffer();script.append("<mce:script type=/"text/javascript/"></mce:script>/n");StringBuffer html = new StringBuffer();html.append(script);if (title != null && title.trim().length() > 0) {html.append("<h2>" + title + "</h2><br />/n");}html.append("<table cellpadding=/"0/" cellspacing=/"0/" border=/"0/" ");if (css != null && css.trim().length() > 0) {html.append("class=/"" + css + "/" ");}html.append("id=/"example/">/n");html.append("<thead>/n");html.append("<tr>/n");html.append("<th><input type=/"checkbox/" name=/"selectAll/" /></th>/n");html.append("<th>代码</th>/n");html.append("<th>承运商名称</th>/n");html.append("<th>国家</th>/n");html.append("<th>省份</th>/n");html.append("<th>城市</th>/n");html.append("<th>区/县</th>/n");html.append("<th>状态</th>/n");html.append("<th>区/县</th>/n");html.append("<th>状态</th>/n");html.append("</tr>/n");html.append("</thead>/n");html.append("</table>/n");writer.write(html.toString());} catch (IOException e) {e.printStackTrace();}return true;}public boolean end(Writer writer) {return true;}@Overridepublic boolean usesBody() {return false;}}

2. Define the tag, here we'll define a datagrid using jQuery plugin, so you should add necessary javascript before using the tag.

package com.stefli.core.component.taglib;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts2.components.Component;import org.apache.struts2.views.jsp.ComponentTagSupport;import com.opensymphony.xwork2.util.ValueStack;public class TMSDatagridTag extends ComponentTagSupport {protected String title;protected String url;protected int width;protected String css;public Component getBean(ValueStack stack, HttpServletRequest request,HttpServletResponse response) {return new TMSDatagridComponent(stack, request);}protected void populateParams() {super.populateParams();TMSDatagridComponent datagridComponent = (TMSDatagridComponent) component;datagridComponent.setTitle(title);datagridComponent.setUrl(url);datagridComponent.setCss(css);}public void setTitle(String title) {this.title = title;}public void setWidth(int width) {this.width = width;}public void setUrl(String url) {this.url = url;}public void setCss(String css) {this.css = css;}}

3. Define the tld, which should be added to "WEB-INF/tld/tms-tags.tld".

<?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>1.1.0</tlib-version><jsp-version>1.2</jsp-version><short-name>t</short-name><uri>/tms-tags</uri><display-name>"TMS Tags"</display-name><description></description></attribute></tag></taglib>

4. Configure the tag in web.xml

<jsp-config><taglib><taglib-uri>/WEB-INF/tld/tms-tags.tld</taglib-uri><taglib-location>/tms</taglib-location></taglib></jsp-config>

5. Use the tag lib in jsp

<tms:datagrid url="/carrier/getCarrierList.action" css="display" title="Carrier Management" />

Ok, you'll see the result.