Java timer Web

 

 

It is common to execute tasks by using a timer. The following is a simple example:

 

The listener, timertask, and timer classes are used for implementation. In addition, Spring provides advanced timer implementation, which seems to be quarts.

 

For more information, see.

 

 

1. Package com. Rx. timer;
3. Import java. util. date;
4. Import java. util. timertask;
6. Public class mytask extends timertask {
8. @ Override
9. Public void run (){
10. System. Out. println ("call at" + (new date ()));
11. }
13. }

 

1. Package com. Rx. timer;
3. Import java. util. timer;
5. Import javax. servlet. servletcontextevent;
6. Import javax. servlet. servletcontextlistener;
8. Public class mylisten implements servletcontextlistener {
10. Private timer = NULL;
12. @ Override
13. Public void contextdestroyed (servletcontextevent arg0 ){
14. Timer. Cancel ();
15. }
17. @ Override
18. Public void contextinitialized (servletcontextevent arg0 ){
19. Timer = new timer (true );
20. // Set the task schedule, start time, and interval.
21. Timer. Schedule (New mytask (), 0, 1000*10 );
23. }
26. }

 

1. <? XML version = "1.0" encoding = "UTF-8"?>
2. <Web-app id = "webapp_id" version = "2.4" xmlns = "http://java.sun.com/xml/ns/j2ee" xmlns: xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi: schemalocation = "http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
3. <Display-Name>
4. Webtimer </display-Name>
6. <Listener>
7. <Listener-class> com. Rx. Timer. mylisten </listener-class>
8. </Listener>
10. <Welcome-file-List>
11. <Welcome-File> index. jsp </welcome-File>
12. </Welcome-file-List>
13. </Web-app>

 

 

1. 2008-11-20 20:52:35 org. Apache. tomcat. util. digester. setpropertiesrule begin
2. Warning: [setpropertiesrule] {server/service/engine/host/context} setting property 'source' to 'org. eclipse. JST. j2EE. server: webtimer 'did not find a matching property.
3. 2008-11-20 20:52:35 org. Apache. Catalina. Core. aprlifecyclelistener init
4. Information: The APR based Apache Tomcat native library which allows optimal performance in production environments was not found on the java. library. path: C:/program files/Java/jre1.6.0 _ 07/bin ;.; c:/Windows/Sun/Java/bin; C:/Windows/system32; C:/windows; C:/program files/Java/jre1.6.0 _ 07/bin/client; c:/program files/Java/jre1.6.0 _ 07/bin; C:/Windows/system32; C:/windows; C:/Windows/system32/WBEM; C: /program files/MIC Rosoft SQL Server/90/tools/binn/; C:/progra ~ 1/IBM/sqllib/bin; C:/progra ~ 1/IBM/sqllib/function; C:/progra ~ 1/IBM/sqllib/samples/repl; C:/IBM/installation Manager/Eclipse/LIB; C:/program files/MySQL Server 4.1/bin; C: /program files/tortoisesvn/bin; C:/program files/subversion/bin; C:/program files/stormii/codec; C:/program files/stormii; C: /program files/IDM computer solutions/ultraedit/
5. 20:52:35 org. Apache. Coyote. http11.http11protocol init
6. Information: initializing coyote HTTP/1.1 on http-8080
7. 2008-11-20 20:52:35 org. Apache. Catalina. startup. Catalina Load
8. Information: initialization processed in 795 MS
9. 2008-11-20 20:52:35 org. Apache. Catalina. Core. standardservice start
10. Information: starting service Catalina
11. 2008-11-20 20:52:35 org. Apache. Catalina. Core. standardengine start
12. Information: Starting Servlet Engine: Apache Tomcat/6.0.18
13. 20:52:36 org. Apache. Catalina. loader. webappclassloader validatejarfile
14. Information: validatejarfile (D:/eclipseworkspace /. metadata /. plugins/org. eclipse. WST. server. core/tmp0/wtpwebapps/webtimer/WEB-INF/lib/servlet-api.jar)-jar not loaded. see servlet spec 2.3, section 9.7.2. offending class: javax/servlet. class
15. Call at Thu Nov 20 20:52:36 CST 2008
16. 20:52:36 org. Apache. Coyote. http11.http11protocol start
17. Information: Starting coyote HTTP/1.1 on http-8080
18. 20:52:36 org. Apache. JK. Common. channelsocket init
19. Information: JK: ajp13 listening on/0.0.0.0: 8009
20. 2008-11-20 20:52:36 org. Apache. JK. server. jkmain start
21. Description: JK running id = 0 time = 0/31 Config = NULL
22. 2008-11-20 20:52:36 org. Apache. Catalina. startup. Catalina start
23. Information: server startup in 654 MS
24. Call at Thu Nov 20 20:52:46 CST 2008
25. Call at Thu Nov 20 20:52:56 CST 2008
26. Call at Thu Nov 20 20:53:06 CST 2008
27. Call at Thu Nov 20 20:53:16 CST 2008
28. Call at Thu Nov 20 20:53:26 CST 2008
29. Call at Thu Nov 20 20:53:36 CST 2008
30. Call at Thu Nov 20 20:53:46 CST 2008
31. Call at Thu Nov 20 20:53:56 CST 2008
32. Call at Thu Nov 20 20:54:06 CST 2008
33. Call at Thu Nov 20 20:54:16 CST 2008
34. Call at Thu Nov 20 20:54:26 CST 2008
35. Call at Thu Nov 20 20:54:36 CST 2008
36. Call at Thu Nov 20 20:54:46 CST 2008
37. Call at Thu Nov 20 20:54:56 CST 2008
38. Call at Thu Nov 20 20:55:06 CST 2008
39. Call at Thu Nov 20 20:55:16 CST 2008
40. Call at Thu Nov 20 20:55:26 CST 2008
41. Call at Thu Nov 20 20:55:36 CST 2008
42. Call at Thu Nov 20 20:55:46 CST 2008
43. Call at Thu Nov 20 20:55:56 CST 2008
44. Call at Thu Nov 20 20:56:06 CST 2008
45. Call at Thu Nov 20 20:56:16 CST 2008
46. Call at Thu Nov 20 20:56:26 CST 2008
47. Call at Thu Nov 20 20:56:36 CST 2008
48. Call at Thu Nov 20 20:56:46 CST 2008
49. Call at Thu Nov 20 20:56:56 CST 2008
50. Call at Thu Nov 20 20:57:06 CST 2008
51. Call at Thu Nov 20 20:57:16 CST 2008