做了个简单的面包屑导航功能,比如页面上大家经常看到的这种导航:
我做成了标签的形式,利用jom4j来解析xml文件:
核心类SiteMapTag:
package org.forever.tag;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
/**
* 站点导航标签的实现
* @author Administrator
*
*/
public class SiteMapTag extends TagSupport {
private static final long serialVersionUID = -3531938467909884528L;
private String currentFilePath;
private Element target;
@Override
public int doStartTag() throws JspException {
HttpServletRequest request = (HttpServletRequest) this.pageContext.getRequest();
currentFilePath = request.getRequestURI().replaceFirst(request.getContextPath(), "");
try {
Element root = (Element)pageContext.getServletContext().getAttribute("webSiteMapSet");
if(root==null){
SAXReader reader = new SAXReader();
InputStream inputStream = SiteMapTag.class.getClassLoader().getResourceAsStream("sitemap.xml");
Document document = reader.read(inputStream);
root = document.getRootElement();
pageContext.getServletContext().setAttribute("webSiteMapSet", root);
}
parseParent(root);
StringBuffer content = new StringBuffer("");
List<String> titles = new ArrayList<String>();
List<String> hrefs = new ArrayList<String>();
while(target!=null){
Attribute attTitle = target.attribute("title");
if(attTitle!=null){
titles.add(attTitle.getText());
}
Attribute attHref = target.attribute("href");
if(attHref!=null){
hrefs.add(attHref.getText());
}else{
hrefs.add("");
}
target = target.getParent();
}
for (int i = titles.size()-1; i >=0; i--) {
String href = hrefs.get(i);
if(href.equals("")){
content.append(titles.get(i)+"-->");
}else{
content.append("<a href='"+href+"'>"+titles.get(i)+"</a>-->");
}
}
if(content.length()>0){
this.pageContext.getOut().println(content.delete(content.length()-6, content.length()));
}
} catch (Exception e) {
e.printStackTrace();
throw new JspException(e);
}
return super.doStartTag();
}
private void parseParent(Element parent){
Iterator<Element> it = parent.elementIterator();
while(it.hasNext()){
Element temp = it.next();
Attribute attr = temp.attribute("path");
if(attr!=null){
if(attr.getText().equals(currentFilePath)){
target = temp;
return;
}
}
parseParent(temp);
}
}
}
sitemap.tld文件:
<?xml version="1.0" encoding="UTF-8" ?> <taglib xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd" version="2.1"> <description>站点导航标签</description> <display-name>myTaglib siteMap</display-name> <tlib-version>1.1</tlib-version> <short-name>tagUtil</short-name> <uri>http://tag.forever.org/jsp/tagutil/sitemap</uri> <tag> <description>面包屑标签</description> <name>siteMap</name> <tag-class>org.forever.tag.SiteMapTag</tag-class> <body-content>empty</body-content> </tag> </taglib>
在项目的src下面添加sitemap.xml文件:
<?xml version="1.0" encoding="UTF-8"?> <!-- 配置文件说明, sitemap根节点,title是页面上显示的内容, href是超链接,path是该请求页面的物理路径 --> <sitemap title="音乐社区" href="index.action"> <node title="用户模块"> <node path="/WEB-INF/pages/user/register_view.jsp" href="user/registerView.action" title="用户注册" /> </node> </sitemap>
要使用的jsp加入标签指令:
<%@taglib uri="http://tag.forever.org/jsp/tagutil/sitemap" prefix="tagUtil" %>
在想放的位置处加上标签:
您所在的位置:<tagUtil:siteMap/>就可以了。
sitemap.jar带源码。用的时候别忘了添加jom4j的支持。