前段时间工作需要，需要构建一个面包屑导航，想到了了.net下的站点地图、面包屑导航控件，于是自己也做了简单的封装，形成了jsp下的站点地图，不足之处忘大家指正。
涉及到的文件：
SiteMapUtil.java 用来构建站点地图的工具类
BaseAction.java 调用输出导航栏
SiteMapNode.java 自定义站点节点
sitemap.xml 站点地图配置文件
直接上代码了： sitemap.xml站点地图的配置文件 节点由 href:action path(系统路径) title(标题)构成
SiteMapUtil.java
package com.maxi.base.util;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
/**
* 站点导航的实现
* @author mx
*/
public class SiteMapUtil {
private static List allFullPaths = new ArrayList();//记录站点地图的所有jsp的节点全路径
private static List allPaths = new ArrayList();//记录站点地图的所有jsp路径
public static void siteMapSetting(HttpServletRequest request,String path,String href){
try {
Map map = (Map)request.getSession().getAttribute("webSiteMap");
String nowPath = (String)request.getSession().getAttribute("nowPath");
if(map==null){
SAXReader reader = new SAXReader();
InputStream inputStream = SiteMapUtil.class.getClassLoader().getResourceAsStream("sitemap.xml");
Document document = reader.read(inputStream);
Element root = document.getRootElement();
map = new HashMap();
put2Map(root,null,map);
request.getSession().setAttribute("webSiteMap", map);
}
if(allPaths.size()!=0&&!allPaths.contains(path)){
return;
}else{
if(nowPath==null||"".equals(nowPath)){
nowPath = path;
}else{
if(allFullPaths.contains(nowPath+path)){
nowPath = nowPath + path;
}else{
if(nowPath.contains(path)){
nowPath = nowPath.substring(0, nowPath.indexOf(path))+path;
}else{
for(String s:allFullPaths){
if(s.endsWith(path)){
nowPath = s;
break;
}
}
}
}
}
}
SiteMapNode target = map.get(nowPath);
if(target==null){
return;
}else{
StringBuffer content = new StringBuffer("您的当前位置：");
List titles = new ArrayList();
List hrefs = new ArrayList();
while(target!=null){
if(target.getTitle()!=null){
titles.add(target.getTitle());
}
if(target.isVariable()&&path.equals(target.getPath())){
hrefs.add(href);
target.setHref(href);
}else if(target.getHref()!=null&!target.getHref().equals("")){
hrefs.add(target.getHref());
}else {
hrefs.add("");
target.setHref("");
}
target = target.getParent();
}
for (int i = titles.size()-1; i >=0; i--) {
String a = hrefs.get(i);
if(a.equals("")){
content.append(titles.get(i)+"-->");
}else{
content.append(""+titles.get(i)+"-->");
}
}
if(content.length()>0){
request.getSession().setAttribute("siteMapString", content.delete(content.length()-6, content.length()));
request.getSession().setAttribute("nowPath", nowPath);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
//将xml中的所有节点转换为自定义节点并存储进入Map中，key:fullpath(全路径，可唯一确定一个节点)
public static void put2Map(Element root,SiteMapNode parent,Map map){
SiteMapNode node = getXML2Bean(root);
if(parent!=null){
node.setParent(parent);
parent.getChildren().add(node);
}
map.put(node.getFullPath(), node);
allFullPaths.add(node.getFullPath());
allPaths.add(node.getPath());
Iterator it = root.elementIterator();
while(it.hasNext()){
put2Map(it.next(),node,map);
}
}
//将xml中读取的Element转换成自定义的节点对象：SiteMapNode
public static SiteMapNode getXML2Bean(Element ele){
SiteMapNode node = new SiteMapNode();
node.setPath(ele.attribute("path").getText());
node.setTitle(ele.attribute("title").getText());
node.setHref(ele.attribute("href")==null||ele.attribute("href").equals("")?"":ele.attribute("href").getText());
node.setVariable(ele.attribute("href")==null||ele.attribute("href").equals("")?true:false);
return node;
}
}
自定义节点SiteMapNode：
package com.zohl.quicklms.base.util;
import java.util.ArrayList;
import java.util.List;
public class SiteMapNode {
private String title; //节点显示名称
private String path; //jsp页面全路径 与 struts配置文件中的path保持一致
private String href; //action全路径
private boolean variable;//记录该几点的href是否是动态获取的 当配置文件中已经定义好href则 variable = false; 否则为true
private String fullPath;//本节点在节点树中的路径 = 父节点的全路径+本节点的path
private SiteMapNode parent;//父节点
private List children = new ArrayList();//子节点集合
public String getPath() {
return path;
}
public void setPath(String path) {
this.path = path;
}
public String getHref() {
return href;
}
public void setHref(String href) {
this.href = href;
}
public List getChildren() {
return children;
}
public void setChildren(List children) {
this.children = children;
}
public SiteMapNode getParent() {
return parent;
}
public void setParent(SiteMapNode parent) {
this.parent = parent;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getFullPath() {
if(fullPath==null||"".equals(fullPath)){
if(parent!=null){
fullPath = parent.getFullPath()+path;
}else{
fullPath = path;
}
}
return fullPath;
}
public void setFullPath(String fullPath) {
this.fullPath = fullPath;
}
public boolean isVariable() {
return variable;
}
public void setVariable(boolean variable) {
this.variable = variable;
}
}
BaseAction.java关键在于调用
@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
String url = request.getRequestURL().toString();
String queryString = request.getQueryString();
ActionForward forward = super.execute(mapping, form, request, response);
try{
request.getSession().setAttribute("siteMapString", "");
//面包屑导航
if(forward!=null&&forward.getPath()!=null&&!forward.getPath().equals("")){
SiteMapUtil.siteMapSetting(request, forward.getPath(), url+"?"+queryString);
}
}catch(Exception exp){
exp.printStackTrace();
}
return forward;
}