springboot啟動原理

springboot專案一般都是打包成jar包直接執行main方法啟動,當然也可以跟傳統的專案一樣打包war包放在tomcat裡面啟動.那麼springboot怎麼直接通過main方法啟動呢?

舉個栗子,這是乙個簡單的main方法啟動類:

@enableasync

@enablescheduling
@enabletransactionmanagement
@enableconfigurationproperties
@enablecaching
(value =
)public
class
}

public

(class<
?>
primarysources, string[
] args)

public

(resourceloader resourceloader, class<
?>..
. primarysources)
private class<
?>()
}}catch
(classnotfoundexception ex)
return null;
}

(string.

.. args)

, context)

;//準備容器

preparecontext

;//重新整理容器

refreshcontext

(context)

;//spring容器後置處理

afterrefresh

;//計時終止

stopwatch.

stop()

;if(this

.logstartupinfo)

//結束通知

listeners.

started

(context)

;//執行runner

callrunners;}

catch

(throwable ex)

trycatch

(throwable ex)

//返回容器

return context;

}getrunlisteners方法,starting方法,獲取啟動監聽,和啟動

原始碼:(string[

] args)

;return

new(logger,

getspringfactoriesinstances

class

, types,

this

, args));

}private

collection

getspringfactoriesinstances

(class

type, class<

?>

parametertypes, object.

.. args)

prepareenvironment準備環境

//準備啟動引數就不說了

new(args)
;private configurableenvironment prepareenvironment
//配置propertysources-如果有attach到environment
configurationpropertysources.
attach
(environment)
;return environment;
}

preparecontext,準備容器

private

void
preparecontext
// add boot specific singleton beans
//獲取beanfactory,註冊相關bean
configurablelistablebeanfactory beanfactory = context.
getbeanfactory()
; beanfactory.
registersingleton(;
if(printedbanner != null)
if(beanfactory instanceof
defaultlistablebeanfactory
)//延遲載入if(
this
.lazyinitialization)
// load the sources
setsources =
getallsources()
; assert.
notempty
(sources,
"sources must not be empty");
//載入啟動類
load
(context, sources.
toarray
(new
object[0
]));
listeners.
contextloaded
(context)
;}

就是spring容器的重新整理方法

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