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          ?? 相信做軟件的朋友都有這樣的經歷,我的軟件是不是少了點什么東西呢?比如定時任務啊,

          ?? 就拿新聞發布系統來說,如果新聞的數據更新太快,勢必涉及一個問題,這些新聞不能由人工的去發布,應該讓系統自己發布,這就需要用到定時定制任務了,以前 定制任務無非就是設計一個Thread,并且設置運行時間片,讓它到了那個時間執行一次,就ok了,讓系統啟動的時候啟動它,想來也夠簡單的。不過有了 spring,我想這事情就更簡單了。

          看看spring的配置文件,想來就只有這個配置文件了

          xml 代碼
          1. < bean ? id = "infoCenterAutoBuildTask" ??
          2. ???? class = "com.teesoo.teanet.scheduling.InfoCenterAutoBuildTask" > ??
          3. ???? < property ? name = "baseService" ? ref = "baseService" ? /> ??
          4. ???? < property ? name = "htmlCreator" ? ref = "htmlCreator" ? /> ??
          5. </ bean > ??
          6. ??
          7. < bean ? id = "scheduledTask" ??
          8. ???? class = "org.springframework.scheduling.timer.ScheduledTimerTask" > ??
          9. ???? <!--?wait?10?seconds?before?starting?repeated?execution?--> ??
          10. ???? < property ? name = "delay" ? value = "10000" ? /> ??
          11. ???? <!--?run?every?50?seconds?--> ??
          12. ???? < property ? name = "period" ? value = "1000000" ? /> ??
          13. ???? < property ? name = "timerTask" ? ref = "infoCenterAutoBuildTask" ? /> ??
          14. </ bean > ??
          15. ??
          16. ??
          17. < bean ? id = "timerFactory" ? class = "org.springframework.scheduling.timer.TimerFactoryBean" > ??
          18. ??? < property ? name = "scheduledTimerTasks" > ??
          19. ??????? < list > ??
          20. ??????????? <!--?see?the?example?above?--> ??
          21. ??????????? < ref ? bean = "scheduledTask" ? /> ??
          22. ??????? </ list > ??
          23. ??? </ property > ??
          24. </ bean > ??

          上面三個配置文件中只有一個配置文件是涉及到您自己的class的,其他的都是spring的類。很簡單吧

          我們只需要涉及一個class讓他繼承java.util.TimerTask;

          java 代碼
          1. BaseTask? extends ?java.util.TimerTask?{ ??
          2. //用戶只需要實現這個方面,把自己的任務放到這里 ??
          3. public ? void ?run(){ ??
          4. } ??
          5. }??

          ?

          下面讓我們來看看 spring的源代碼

          java 代碼
          1. /* ?
          2. ?*?Copyright?2002-2005?the?original?author?or?authors. ?
          3. ?*? ?
          4. ?*?Licensed?under?the?Apache?License,?Version?2.0?(the?"License"); ?
          5. ?*?you?may?not?use?this?file?except?in?compliance?with?the?License. ?
          6. ?*?You?may?obtain?a?copy?of?the?License?at ?
          7. ?*? ?
          8. ?*??????http://www.apache.org/licenses/LICENSE-2.0 ?
          9. ?*? ?
          10. ?*?Unless?required?by?applicable?law?or?agreed?to?in?writing,?software ?
          11. ?*?distributed?under?the?License?is?distributed?on?an?"AS?IS"?BASIS, ?
          12. ?*?WITHOUT?WARRANTIES?OR?CONDITIONS?OF?ANY?KIND,?either?express?or?implied. ?
          13. ?*?See?the?License?for?the?specific?language?governing?permissions?and ?
          14. ?*?limitations?under?the?License. ?
          15. ?*/ ??
          16. ??
          17. package ?org.springframework.scheduling.timer; ??
          18. ??
          19. import ?java.util.TimerTask; ??
          20. ??
          21. /** ?
          22. ?*?JavaBean?that?describes?a?scheduled?TimerTask,?consisting?of ?
          23. ?*?the?TimerTask?itself?(or?a?Runnable?to?create?a?TimerTask?for) ?
          24. ?*?and?a?delay?plus?period.?Period?needs?to?be?specified; ?
          25. ?*?there?is?no?point?in?a?default?for?it. ?
          26. ?* ?
          27. ?*?

            The?JDK?Timer?does?not?offer?more?sophisticated?scheduling

            ?
          28. ?*?options?such?as??cron?expressions.?Consider?using?Quartz?for ?
          29. ?*?such?advanced?needs. ?
          30. ?* ?
          31. ?*?

            Note?that?Timer?uses?a?TimerTask?instance?that?is?shared

            ?
          32. ?*?between?repeated?executions,?in?contrast?to?Quartz?which ?
          33. ?*?instantiates?a?new?Job?for?each?execution. ?
          34. ?* ?
          35. ?*?@author?Juergen?Hoeller ?
          36. ?*?@since?19.02.2004 ?
          37. ?*?@see?java.util.TimerTask ?
          38. ?*?@see?java.util.Timer#schedule(TimerTask,?long,?long) ?
          39. ?*?@see?java.util.Timer#scheduleAtFixedRate(TimerTask,?long,?long) ?
          40. ?*/ ??
          41. public ? class ?ScheduledTimerTask?{ ??
          42. ??
          43. ???? private ?TimerTask?timerTask; ??
          44. ??
          45. ???? private ? long ?delay?=? 0 ; ??
          46. ??
          47. ???? private ? long ?period?=? 0 ; ??
          48. ??
          49. ???? private ? boolean ?fixedRate?=? false ; ??
          50. ??
          51. ??
          52. ???? /** ?
          53. ?????*?Create?a?new?ScheduledTimerTask, ?
          54. ?????*?to?be?populated?via?bean?properties. ?
          55. ?????*?@see?#setTimerTask ?
          56. ?????*?@see?#setDelay ?
          57. ?????*?@see?#setPeriod ?
          58. ?????*?@see?#setFixedRate ?
          59. ?????*/ ??
          60. ???? public ?ScheduledTimerTask()?{ ??
          61. ????} ??
          62. ??
          63. ???? /** ?
          64. ?????*?Create?a?new?ScheduledTimerTask,?with?default ?
          65. ?????*?one-time?execution?without?delay. ?
          66. ?????*?@param?timerTask?the?TimerTask?to?schedule ?
          67. ?????*/ ??
          68. ???? public ?ScheduledTimerTask(TimerTask?timerTask)?{ ??
          69. ???????? this .timerTask?=?timerTask; ??
          70. ????} ??
          71. ??
          72. ???? /** ?
          73. ?????*?Create?a?new?ScheduledTimerTask,?with?default ?
          74. ?????*?one-time?execution?with?the?given?delay. ?
          75. ?????*?@param?timerTask?the?TimerTask?to?schedule ?
          76. ?????*?@param?delay?the?delay?before?starting?the?task?for?the?first?time?(ms) ?
          77. ?????*/ ??
          78. ???? public ?ScheduledTimerTask(TimerTask?timerTask,? long ?delay)?{ ??
          79. ???????? this .timerTask?=?timerTask; ??
          80. ???????? this .delay?=?delay; ??
          81. ????} ??
          82. ??
          83. ???? /** ?
          84. ?????*?Create?a?new?ScheduledTimerTask. ?
          85. ?????*?@param?timerTask?the?TimerTask?to?schedule ?
          86. ?????*?@param?delay?the?delay?before?starting?the?task?for?the?first?time?(ms) ?
          87. ?????*?@param?period?the?period?between?repeated?task?executions?(ms) ?
          88. ?????*?@param?fixedRate?whether?to?schedule?as?fixed-rate?execution ?
          89. ?????*/ ??
          90. ???? public ?ScheduledTimerTask(TimerTask?timerTask,? long ?delay,? long ?period,? boolean ?fixedRate)?{ ??
          91. ???????? this .timerTask?=?timerTask; ??
          92. ???????? this .delay?=?delay; ??
          93. ???????? this .period?=?period; ??
          94. ???????? this .fixedRate?=?fixedRate; ??
          95. ????} ??
          96. ??
          97. ???? /** ?
          98. ?????*?Create?a?new?ScheduledTimerTask,?with?default ?
          99. ?????*?one-time?execution?without?delay. ?
          100. ?????*?@param?timerTask?the?Runnable?to?schedule?as?TimerTask ?
          101. ?????*/ ??
          102. ???? public ?ScheduledTimerTask(Runnable?timerTask)?{ ??
          103. ????????setRunnable(timerTask); ??
          104. ????} ??
          105. ??
          106. ???? /** ?
          107. ?????*?Create?a?new?ScheduledTimerTask,?with?default ?
          108. ?????*?one-time?execution?with?the?given?delay. ?
          109. ?????*?@param?timerTask?the?Runnable?to?schedule?as?TimerTask ?
          110. ?????*?@param?delay?the?delay?before?starting?the?task?for?the?first?time?(ms) ?
          111. ?????*/ ??
          112. ???? public ?ScheduledTimerTask(Runnable?timerTask,? long ?delay)?{ ??
          113. ????????setRunnable(timerTask); ??
          114. ???????? this .delay?=?delay; ??
          115. ????} ??
          116. ??
          117. ???? /** ?
          118. ?????*?Create?a?new?ScheduledTimerTask. ?
          119. ?????*?@param?timerTask?the?Runnable?to?schedule?as?TimerTask ?
          120. ?????*?@param?delay?the?delay?before?starting?the?task?for?the?first?time?(ms) ?
          121. ?????*?@param?period?the?period?between?repeated?task?executions?(ms) ?
          122. ?????*?@param?fixedRate?whether?to?schedule?as?fixed-rate?execution ?
          123. ?????*/ ??
          124. ???? public ?ScheduledTimerTask(Runnable?timerTask,? long ?delay,? long ?period,? boolean ?fixedRate)?{ ??
          125. ????????setRunnable(timerTask); ??
          126. ???????? this .delay?=?delay; ??
          127. ???????? this .period?=?period; ??
          128. ???????? this .fixedRate?=?fixedRate; ??
          129. ????} ??
          130. ??
          131. ??
          132. ???? /** ?
          133. ?????*?Set?the?Runnable?to?schedule?as?TimerTask. ?
          134. ?????*?@see?DelegatingTimerTask ?
          135. ?????*/ ??
          136. ???? public ? void ?setRunnable(Runnable?timerTask)?{ ??
          137. ???????? this .timerTask?=? new ?DelegatingTimerTask(timerTask); ??
          138. ????} ??
          139. ??
          140. ???? /** ?
          141. ?????*?Set?the?TimerTask?to?schedule. ?
          142. ?????*/ ??
          143. ???? public ? void ?setTimerTask(TimerTask?timerTask)?{ ??
          144. ???????? this .timerTask?=?timerTask; ??
          145. ????} ??
          146. ??
          147. ???? /** ?
          148. ?????*?Return?the?TimerTask?to?schedule. ?
          149. ?????*/ ??
          150. ???? public ?TimerTask?getTimerTask()?{ ??
          151. ???????? return ?timerTask; ??
          152. ????} ??
          153. ??
          154. ???? /** ?
          155. ?????*?Set?the?delay?before?starting?the?task?for?the?first?time, ?
          156. ?????*?in?milliseconds.?Default?is?0,?immediately?starting?the ?
          157. ?????*?task?after?successful?scheduling. ?
          158. ?????*/ ??
          159. ???? public ? void ?setDelay( long ?delay)?{ ??
          160. ???????? this .delay?=?delay; ??
          161. ????} ??
          162. ??
          163. ???? /** ?
          164. ?????*?Return?the?delay?before?starting?the?job?for?the?first?time. ?
          165. ?????*/ ??
          166. ???? public ? long ?getDelay()?{ ??
          167. ???????? return ?delay; ??
          168. ????} ??
          169. ??
          170. ???? /** ?
          171. ?????*?Set?the?period?between?repeated?task?executions,?in?milliseconds. ?
          172. ?????*?Default?is?0,?leading?to?one-time?execution.?In?case?of?a?positive ?
          173. ?????*?value,?the?task?will?be?executed?repeatedly,?with?the?given?interval ?
          174. ?????*?inbetween?executions. ?
          175. ?????*?

            Note?that?the?semantics?of?the?period?vary?between?fixed-rate

            ?
          176. ?????*?and?fixed-delay?execution. ?
          177. ?????*?@see?#setFixedRate ?
          178. ?????*/ ??
          179. ???? public ? void ?setPeriod( long ?period)?{ ??
          180. ???????? this .period?=?period; ??
          181. ????} ??
          182. ??
          183. ???? /** ?
          184. ?????*?Return?the?period?between?repeated?task?executions. ?
          185. ?????*/ ??
          186. ???? public ? long ?getPeriod()?{ ??
          187. ???????? return ?period; ??
          188. ????} ??
          189. ??
          190. ???? /** ?
          191. ?????*?Set?whether?to?schedule?as?fixed-rate?execution,?rather?than ?
          192. ?????*?fixed-delay?execution.?Default?is?"false",?i.e.?fixed?delay. ?
          193. ?????*?

            See?Timer?javadoc?for?details?on?those?execution?modes.

            ?
          194. ?????*?@see?java.util.Timer#schedule(TimerTask,?long,?long) ?
          195. ?????*?@see?java.util.Timer#scheduleAtFixedRate(TimerTask,?long,?long) ?
          196. ?????*/ ??
          197. ???? public ? void ?setFixedRate( boolean ?fixedRate)?{ ??
          198. ???????? this .fixedRate?=?fixedRate; ??
          199. ????} ??
          200. ??
          201. ???? /** ?
          202. ?????*?Return?whether?to?schedule?as?fixed-rate?execution. ?
          203. ?????*/ ??
          204. ???? public ? boolean ?isFixedRate()?{ ??
          205. ???????? return ?fixedRate; ??
          206. ????} ??
          207. ??
          208. } ??

          說實話這個類也沒什么,只是簡單的包裝了我們的timertask,里面也就只有幾個屬性,一個是時間片,一個是任務等。

          真正運行我們的任務的類是:

          java 代碼
          1. /* ?
          2. ?*?Copyright?2002-2006?the?original?author?or?authors. ?
          3. ?* ?
          4. ?*?Licensed?under?the?Apache?License,?Version?2.0?(the?"License"); ?
          5. ?*?you?may?not?use?this?file?except?in?compliance?with?the?License. ?
          6. ?*?You?may?obtain?a?copy?of?the?License?at ?
          7. ?* ?
          8. ?*??????http://www.apache.org/licenses/LICENSE-2.0 ?
          9. ?* ?
          10. ?*?Unless?required?by?applicable?law?or?agreed?to?in?writing,?software ?
          11. ?*?distributed?under?the?License?is?distributed?on?an?"AS?IS"?BASIS, ?
          12. ?*?WITHOUT?WARRANTIES?OR?CONDITIONS?OF?ANY?KIND,?either?express?or?implied. ?
          13. ?*?See?the?License?for?the?specific?language?governing?permissions?and ?
          14. ?*?limitations?under?the?License. ?
          15. ?*/ ??
          16. ??
          17. package ?org.springframework.scheduling.timer; ??
          18. ??
          19. import ?java.util.Timer; ??
          20. ??
          21. import ?org.apache.commons.logging.Log; ??
          22. import ?org.apache.commons.logging.LogFactory; ??
          23. ??
          24. import ?org.springframework.beans.factory.DisposableBean; ??
          25. import ?org.springframework.beans.factory.FactoryBean; ??
          26. import ?org.springframework.beans.factory.InitializingBean; ??
          27. ??
          28. /** ?
          29. ?*?FactoryBean?that?sets?up?a?JDK?1.3+?Timer?and?exposes?it?for?bean?references. ?
          30. ?* ?
          31. ?*?

            Allows?for?registration?of?ScheduledTimerTasks,?automatically?starting

            ?
          32. ?*?the?Timer?on?initialization?and?cancelling?it?on?destruction?of?the?context. ?
          33. ?*?In?scenarios?that?just?require?static?registration?of?tasks?at?startup, ?
          34. ?*?there?is?no?need?to?access?the?Timer?instance?itself?in?application?code. ?
          35. ?* ?
          36. ?*?

            Note?that?Timer?uses?a?TimerTask?instance?that?is?shared?between

            ?
          37. ?*?repeated?executions,?in?contrast?to?Quartz?which?instantiates?a?new ?
          38. ?*?Job?for?each?execution. ?
          39. ?* ?
          40. ?*?@author?Juergen?Hoeller ?
          41. ?*?@since?19.02.2004 ?
          42. ?*?@see?ScheduledTimerTask ?
          43. ?*?@see?java.util.Timer ?
          44. ?*?@see?java.util.TimerTask ?
          45. ?*/ ??
          46. public ? class ?TimerFactoryBean? implements ?FactoryBean,?InitializingBean,?DisposableBean?{ ??
          47. ??
          48. ???? protected ? final ?Log?logger?=?LogFactory.getLog(getClass()); ??
          49. ??
          50. ???? private ?ScheduledTimerTask[]?scheduledTimerTasks; ??
          51. ??
          52. ???? private ? boolean ?daemon?=? false ; ??
          53. ??
          54. ???? private ?Timer?timer; ??
          55. ??
          56. ??
          57. ???? /** ?
          58. ?????*?Register?a?list?of?ScheduledTimerTask?objects?with?the?Timer?that ?
          59. ?????*?this?FactoryBean?creates.?Depending?on?each?SchedulerTimerTask's ?
          60. ?????*?settings,?it?will?be?registered?via?one?of?Timer's?schedule?methods. ?
          61. ?????*?@see?java.util.Timer#schedule(java.util.TimerTask,?long) ?
          62. ?????*?@see?java.util.Timer#schedule(java.util.TimerTask,?long,?long) ?
          63. ?????*?@see?java.util.Timer#scheduleAtFixedRate(java.util.TimerTask,?long,?long) ?
          64. ?????*/ ??
          65. ???? public ? void ?setScheduledTimerTasks(ScheduledTimerTask[]?scheduledTimerTasks)?{ ??
          66. ???????? this .scheduledTimerTasks?=?scheduledTimerTasks; ??
          67. ????} ??
          68. ??
          69. ???? /** ?
          70. ?????*?Set?whether?the?timer?should?use?a?daemon?thread, ?
          71. ?????*?just?executing?as?long?as?the?application?itself?is?running. ?
          72. ?????*?

            Default?is?"false":?The?timer?will?automatically?get?cancelled?on

            ?
          73. ?????*?destruction?of?this?FactoryBean.?Hence,?if?the?application?shuts?down, ?
          74. ?????*?tasks?will?by?default?finish?their?execution.?Specify?"true"?for?eager ?
          75. ?????*?shutdown?of?threads?that?execute?tasks. ?
          76. ?????*?@see?java.util.Timer#Timer(boolean) ?
          77. ?????*/ ??
          78. ???? public ? void ?setDaemon( boolean ?daemon)?{ ??
          79. ???????? this .daemon?=?daemon; ??
          80. ????} ??
          81. ??
          82. ??
          83. ???? public ? void ?afterPropertiesSet()?{ ??
          84. ????????logger.info( "Initializing?Timer" ); ??
          85. ???????? this .timer?=?createTimer( this .daemon); ??
          86. ??
          87. ???????? //?Register?all?ScheduledTimerTasks. ??
          88. ???????? if ?( this .scheduledTimerTasks?!=? null )?{ ??
          89. ???????????? for ?( int ?i?=? 0 ;?i?<? this .scheduledTimerTasks.length;?i++)?{ ??
          90. ????????????????ScheduledTimerTask?scheduledTask?=? this .scheduledTimerTasks[i]; ??
          91. ???????????????? if ?(scheduledTask.getPeriod()?>? 0 )?{ ??
          92. ???????????????????? //?repeated?task?execution ??
          93. ???????????????????? if ?(scheduledTask.isFixedRate())?{ ??
          94. ???????????????????????? this .timer.scheduleAtFixedRate( ??
          95. ????????????????????????????????scheduledTask.getTimerTask(),?scheduledTask.getDelay(),?scheduledTask.getPeriod()); ??
          96. ????????????????????} ??
          97. ???????????????????? else ?{ ??
          98. ???????????????????????? this .timer.schedule( ??
          99. ????????????????????????????????scheduledTask.getTimerTask(),?scheduledTask.getDelay(),?scheduledTask.getPeriod()); ??
          100. ????????????????????} ??
          101. ????????????????} ??
          102. ???????????????? else ?{ ??
          103. ???????????????????? //?One-time?task?execution. ??
          104. ???????????????????? this .timer.schedule(scheduledTask.getTimerTask(),?scheduledTask.getDelay()); ??
          105. ????????????????} ??
          106. ????????????} ??
          107. ????????} ??
          108. ????} ??
          109. ??
          110. ???? /** ?
          111. ?????*?Create?a?new?Timer?instance.?Called?by?afterPropertiesSet. ?
          112. ?????*?Can?be?overridden?in?subclasses?to?provide?custom?Timer?subclasses. ?
          113. ?????*?@param?daemon?whether?to?create?a?Timer?that?runs?as?daemon?thread ?
          114. ?????*?@return?a?new?Timer?instance ?
          115. ?????*?@see?#afterPropertiesSet() ?
          116. ?????*?@see?java.util.Timer#Timer(boolean) ?
          117. ?????*/ ??
          118. ???? protected ?Timer?createTimer( boolean ?daemon)?{ ??
          119. ???????? return ? new ?Timer(daemon); ??
          120. ????} ??
          121. ??
          122. ??
          123. ???? public ?Object?getObject()?{ ??
          124. ???????? return ? this .timer; ??
          125. ????} ??
          126. ??
          127. ???? public ?Class?getObjectType()?{ ??
          128. ???????? return ?Timer. class ; ??
          129. ????} ??
          130. ??
          131. ???? public ? boolean ?isSingleton()?{ ??
          132. ???????? return ? true ; ??
          133. ????} ??
          134. ??
          135. ??
          136. ???? /** ?
          137. ?????*?Cancel?the?Timer?on?bean?factory?shutdown,?stopping?all?scheduled?tasks. ?
          138. ?????*?@see?java.util.Timer#cancel() ?
          139. ?????*/ ??
          140. ???? public ? void ?destroy()?{ ??
          141. ????????logger.info( "Cancelling?Timer" ); ??
          142. ???????? this .timer.cancel(); ??
          143. ????} ??
          144. ??
          145. } ??

          ?

          這個類就是運行我們任務的類了,我們可以定制N個任務,只需要塞到這里就ok了。



          爬蟲工作室 -- 專業的手機軟件開發工作室
          3G視線 -- 專注手機軟件開發
          posted on 2007-04-01 15:04 3G工作室 閱讀(2844) 評論(0)  編輯  收藏 所屬分類: j2ee
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