静态网站网页的一种做法

我要说的做法是：
用后台任务程序根据制定的条件 将jsp页面的内容复制到html上，使用者看到的都是html页面！

下面的一个类是用于将jsp页面的内容复制到html上

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;

/**
 * 
 * To change the template for this generated type comment go to Window>Preferences>Java>Code Generation>Code and Comments
 */
public class MakeHtml {
	private static long star = 0;
	private static long end = 0;
	private static long ttime = 0;

	// 返回html代码
	public static String getHtmlCode(String httpUrl) {
		Date before = new Date();
		star = before.getTime();
		String htmlCode = "";
		try {
			InputStream in;
			URL url = new java.net.URL(httpUrl);
			HttpURLConnection connection = (HttpURLConnection) url.openConnection();
			connection = (HttpURLConnection) url.openConnection();
			//connection.setRequestProperty("User-Agent", "Mozilla/4.0");
			connection.connect();
			in = connection.getInputStream();
			java.io.BufferedReader breader = new BufferedReader(new InputStreamReader(in, "GBK"));
			String currentLine;
			while ((currentLine = breader.readLine()) != null) {
				htmlCode += currentLine;
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			Date after = new Date();
			end = after.getTime();
			ttime = end - star;
			System.out.println("执行时间:" + ttime + "秒");
		}
		return htmlCode;
	}

	// 存储文件
	public static synchronized void writeHtml(String filePath, String info, String flag) {

		PrintWriter pw = null;
		try {
			File writeFile = new File(filePath);
			boolean isExit = writeFile.exists();
			if (isExit != true) {
				writeFile.createNewFile();
			} else {
				if (!flag.equals("NO")) {
					writeFile.delete();
					writeFile.createNewFile();
				}
			}
			//pw = new PrintWriter(new FileOutputStream(filePath, true));//true表示接着原来的往下写
			pw = new PrintWriter(new FileOutputStream(filePath));
			pw.println(info);
			pw.close();
		} catch (Exception ex) {
			System.out.println(ex.getMessage());
		} finally {
			pw.close();
		}
	}

	public static void main(String[] args) {
		String url = "http://192.168.61.113:8080/makehtml/index.jsp";
		writeHtml("http://192.168.61.113:8080/index.html", getHtmlCode(url), "NO");
	}
}

如果想制定时间就更新html，那可以考虑用java自带的java.util.Timer、TimerTask
可以参考
http://jimjiang.iteye.com/blog/110790或
http://blog.csdn.net/tianhappy/archive/2006/08/27/1126841.aspx

还有一种更简单的时间调度框架Quartz，可参考
http://www.ibm.com/developerworks/cn/java/j-quartz/index.html

我用Quartz简单地写了一个例子，比如每5分钟更新一次html网页,运行下面的CronTriggerRunner类就可以了（Quartz需要jar包，要自己去下载http://www.opensymphony.com/quartz/download.action）

import java.util.Date;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import com.huanglq.tools.MakeHtml;

public class SimpleQuartzJob implements Job {

    public SimpleQuartzJob() {
    }

    public void execute(JobExecutionContext context) throws JobExecutionException {
        String url = "http://192.168.61.113:8080/makehtml/index.jsp";
        MakeHtml.writeHtml("http://192.168.61.113:8080/index.html", MakeHtml.getHtmlCode(url), "NO");
    }
}

import org.quartz.CronExpression;
import org.quartz.CronTrigger;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SchedulerFactory;
import org.quartz.impl.StdSchedulerFactory;

public class CronTriggerRunner {

    public void task() throws SchedulerException
    {
        // Initiate a Schedule Factory
        SchedulerFactory schedulerFactory = new StdSchedulerFactory();
        // Retrieve a scheduler from schedule factory
        Scheduler scheduler = schedulerFactory.getScheduler();
        
        // current time
        long ctime = System.currentTimeMillis();
        System.out.println(ctime);
        
        // Initiate JobDetail with job name, job group, and executable job class
        JobDetail jobDetail = new JobDetail("jobDetail2", "jobDetailGroup2", SimpleQuartzJob.class);
        // Initiate CronTrigger with its name and group name
        CronTrigger cronTrigger = new CronTrigger("cronTrigger", "triggerGroup2");
        try {
            // setup CronExpression
            CronExpression cexp = new CronExpression("* 0/5 * * * ?");
            // Assign the CronExpression to CronTrigger
            cronTrigger.setCronExpression(cexp);
        } catch (Exception e) {
            e.printStackTrace();
        }
        // schedule a job with JobDetail and Trigger
        scheduler.scheduleJob(jobDetail, cronTrigger);
        
        // start the scheduler
        scheduler.start();
    }
    
    public static void main (String args[]) 
    {
        try {
            CronTriggerRunner qRunner = new CronTriggerRunner();
            qRunner.task();
        } catch (Exception e)
        {
            e.printStackTrace();
        }
    }
    
}