JCrontab简单入门实例详解

<?xml version="1.0" encoding="utf-8"?>


0,5,10,15,20,25,30,35,40,45,50,55
*
*
*
*
*
*
true


xu.crontab.Crontab1
run

<?xml version="1.0" encoding="UTF-8"?>

ADemo
 

LoadOnStartupServlet
xu.crontab.LoadCrontabServlet

PROPERTIES_FILE

E:\EclipseWorkspace\ADemo\src\jcrontab.properties

1


LoadOnStartupServlet
/Startup

package xu.crontab;
 
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Properties;
 
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
 
import org.jcrontab.Crontab;
import org.jcrontab.log.Log;
 
public class LoadCrontabServlet extends HttpServlet {
 
/**
 *
 */
private static final long serialVersionUID = 1L;
private Crontab cron = null;
 
public void init(ServletConfig config) throws ServletException {
super.init(config);
 
try {
System.out.print("Working?...");
process();
System.out.println("OK");
} catch (Exception e) {
throw new ServletException(e);
}
}
 
protected InputStream createPropertiesStream(String name) throws IOException {
return new FileInputStream(name);
}
 
public void process() {
 
String propz = "jcrontab.properties";
 
String props = getServletConfig().getInitParameter("PROPERTIES_FILE");
if (props == null) {
props = propz;
}
 
Properties propObj = new Properties();
try {
InputStream input = createPropertiesStream(props);
propObj.load(input);
} catch (IOException ioe) {
ioe.printStackTrace();
}
ServletConfig c = getServletConfig();
Enumeration keys = c.getInitParameterNames();
while (keys.hasMoreElements()) {
String key = (String) keys.nextElement();
propObj.setProperty(key, c.getInitParameter(key));
}
 
cron = Crontab.getInstance();
 
try {
ShutdownHook();
cron.init(propObj);
} catch (Exception e) {
Log.error(e.toString(), e);
}
}
 
 
public void ShutdownHook() throws Exception {
Runtime.getRuntime().addShutdownHook(new Thread() {
public void run() {
doStop();
}
});
}
 
public void destroy() {
doStop();
}
 
public void doStop() {
Log.info("Shutting down...");
cron.uninit(100);
Log.info("Stoped");
}
}
 

package xu.crontab;
 
import java.util.Date;
 
public class Crontab1 {
  public static void run(String[] args) {
    System.out.println(new Date()+"-----> hello world!!!");
  }
}