java在tomcat里实现计划任务定时生成SiteMap

站想要让搜索引擎搜到，必须设置好keywords，description，title，做好SEO优化，同时sitemap.xml也是不可缺少的

通过Google，得到一些帮助，把自己做的整理一下：

第一、对文件进行查找：

 

public class FileDemo {
	File myDir;
	File[] contents;
	List fileList;
	Iterator currentFileIt;
	File currentFile;
	String path;

	/**
	 * 无参的构造函数
	 * */
	public FileDemo() {
		path = new String("");
		fileList = new ArrayList();
	}

	/**
	 * 有参的构造函数
	 * */
	public FileDemo(String path) {
		this.path = path;
		fileList = new ArrayList();
	}

	/**
	 * 设置要查看的文件路径
	 */
	public void setPath(String path) {
		this.path = path;
	}

	/***************************************************************************
	 * 返回当前目录的路径
	 */
	public String getDirectory() {
		return myDir.getPath();
	}

	public void refreshList() {
		if (this.path.equals(""))
			path = "c:\\";
		myDir = new File(path);

		fileList.clear();
		contents = myDir.listFiles();
		// 重新装入路径下文件
		for (int i = 0; i < contents.length; i++) {
			fileList.add(contents[i]);
		}
		currentFileIt = fileList.iterator();
	}

	/**
	 * 指到下一个条目
	 */
	public boolean nextFile() {
		while (currentFileIt.hasNext()) {
			currentFile = (File) currentFileIt.next();
			
			return true;
		}
		return false;
	}

	/**
	 * 返回当前指向的文件对象的文件名称
	 */
	public String getFileName() {
		return currentFile.getName();
	}

	/**
	 * 返回当前指向的文件对象的文件尺寸
	 */
	public String getFileSize() {
		return convertFileSize(currentFile.length());
	}

	/**
	 * 转换文件尺寸为指定格式。
	 */
	private String convertFileSize(long size) {
		int divisor = 1;
		String unit = "bytes";
		if (size >= 1024 * 1024) {
			divisor = 1024 * 1024;
			unit = "MB";
		} else if (size >= 1024) {
			divisor = 1024;
			unit = "KB";
		}
		if (divisor == 1)
			return size / divisor + " " + unit;
		String aftercomma = "" + 100 * (size % divisor) / divisor;
		if (aftercomma.length() == 1)
			aftercomma = "0" + aftercomma;
		return size / divisor + "." + aftercomma + " " + unit;
	}

	/**
	 * 返回文件的最后修改日期
	 */
	public String getFileTimeStamp() {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		String dateString = sdf.format(new Date(currentFile.lastModified()));

		return dateString;
	}

	/**
	 * 返回文件是不是一个目录
	 */
	public boolean isDirectory() {
		return currentFile.isDirectory();
	}

}

 

第二、创建一个任务类,继承TimerTask

public class XMLParese extends TimerTask{
	
	private ServletContext context;
	
	public XMLParese(ServletContext context){
		this.context=context;
	}
	
	@Override
	public void run() {
		// TODO Auto-generated method stub
		createSiteMap();
		
	}
	public void createSiteMap() {

		String priority = "0.75";// 级 别
		String changefreq = "daily";// "weekly";//频 率
		String xmlpath = "e:/sitemap.xml";// sitemap名称以及位置		
		String homeurl = "http://www.jiujiajiu.cn"; // 栏目首页
		String []directory={"promotion","news","brand","goods","services","shop","winelive"};
		FileDemo fp = new FileDemo();
		try {
			Document document = DocumentHelper.createDocument();
			Element urlsetElement = document.addElement("urlset");
			urlsetElement.addAttribute("xmlns ",
					"http://www.sitemaps.org/schemas/sitemap/0.9"); // "xmlns
																	// "必须要有空格,否则会报错
			urlsetElement.addAttribute("xmlns",
					"http://www.sitemaps.org/schemas/sitemap/0.9");

			urlsetElement.addAttribute("xmlns:xsi",
					"http://www.w3.org/2001/XMLSchema-instance");

			urlsetElement.addAttribute("xsi:schemaLocation",
					"http://www.sitemaps.org/schemas/sitemap/0.9 " +

					"http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd");
			
			//创建url根元素
			Element urlElement ; 
			//为url根元素创建loc网页地址，lastmod更新时间，changefreq更改频率和priority级别
			Element locElement ;
			Element lastmodElement;
			Element changefreqElement;
			Element priorityElement;
			fp.setPath("D:\\Program Files\\Apache Software Foundation\\Tomcat 6.0\\webapps\\ROOT\\");
			fp.refreshList();
			while (fp.nextFile()) {
				if (!fp.isDirectory()) {
					homeurl="http://www.jiujiajiu.cn/";
					String f=fp.getFileName();
					String fname=f.substring(f.lastIndexOf("."));
					if((fname.equals(".html")||fname.equals(".htm")) && !f.equals("login.html")){
						urlElement = urlsetElement.addElement("url");
						locElement = urlElement.addElement("loc");
						lastmodElement = urlElement.addElement("lastmod");
						changefreqElement = urlElement.addElement("changefreq");
						priorityElement = urlElement.addElement("priority");
						
						//导航赋值
						homeurl = homeurl + fp.getFileName();
						locElement.setText(homeurl);
						lastmodElement.setText(fp.getFileTimeStamp());// 这里时间是你更新时间，这里暂时统一
						changefreqElement.setText(changefreq);
						priorityElement.setText(priority);
					}
				}
			}
			
            //各个目录下的文件
			for(int i=0;i<directory.length;i++){
				fp.setPath("D:\\Program Files\\Apache Software Foundation\\Tomcat 6.0\\webapps\\ROOT\\"+directory[i]+"\\");
				fp.refreshList();
				while (fp.nextFile()) {
					homeurl="http://www.jiujiajiu.cn/"+directory[i]+"/";							
					urlElement = urlsetElement.addElement("url");
					locElement = urlElement.addElement("loc");
					lastmodElement = urlElement.addElement("lastmod");
					changefreqElement = urlElement.addElement("changefreq");
					priorityElement = urlElement.addElement("priority");							
					
					homeurl = homeurl + fp.getFileName();
					locElement.setText(homeurl);
					lastmodElement.setText(fp.getFileTimeStamp());// 这里时间是你更新时间，这里暂时统一
					changefreqElement.setText(changefreq);
					priorityElement.setText(priority);
				}
			}

			XMLWriter writer = new XMLWriter(new FileOutputStream(new File(
					xmlpath)));
			writer.write(document);
			writer.close();
			document = null;
			// 格式化
			formatXMLFile(xmlpath, "UTF-8");
		} catch (Exception ex) {
			ex.printStackTrace();

		}

	}

	/**
	 * 格式化XML文档,并解决中文问题
	 * @param xmlpath：xml文件路径
	 * @param charSet:格式化的字符集
	 * @return
	 */
	public static boolean formatXMLFile(String xmlpath, String charSet) {

		boolean returnValue = false;
		try {

			SAXReader saxReader = new SAXReader();
			Document document = saxReader.read(new File(xmlpath));
			XMLWriter output = null;
			OutputFormat format = OutputFormat.createPrettyPrint();
			format.setEncoding(charSet);
			output = new XMLWriter(new FileWriter(new File(xmlpath)), format);
			output.write(document);
			output.close();
			document = null;
			saxReader = null;
			returnValue = true;
		} catch (Exception ex) {
			ex.printStackTrace();
		}
		return returnValue;
	}

}

 

 第三、创建一个任务监听类，实现ServletContextListener 接口

 

public class TimerListener implements ServletContextListener {
	// 设置启动时间为23点;
	private static final int hours = 23;
	private static final int minutes = 0;
	private static final int seconds = 0;
	private Timer timer = null;

	public void contextDestroyed(ServletContextEvent event) {
		timer.cancel();
		event.getServletContext().log("定时器销毁");
	}

	public void contextInitialized(ServletContextEvent event) {
        timer=new Timer(true);
        event.getServletContext().log("定时器已启动");
        Calendar calendar = Calendar.getInstance(); 
        calendar.set(Calendar.HOUR_OF_DAY, hours);
        calendar.set(Calendar.MINUTE, minutes); 
        calendar.set(Calendar.SECOND, seconds);
        
        //SiteMap生成
        //间隔时间1天生成一次
        timer.schedule(new XMLParese(event.getServletContext()),calendar.getTime(),
        		1*24*60*60*1000);
	}
}

 

第四、在web中添加一个监听器
       web.xml里的配置

 

<!-- 定时器 -->
<listener>
	<listener-class>timer.TimerListener</listener-class>
</listener>