{"id":542,"date":"2021-09-23T15:50:59","date_gmt":"2021-09-23T07:50:59","guid":{"rendered":"https:\/\/explause.com\/?p=542"},"modified":"2021-09-23T15:50:59","modified_gmt":"2021-09-23T07:50:59","slug":"%e5%ae%9a%e5%88%b6bean%e7%9a%84%e8%a1%8c%e4%b8%ba","status":"publish","type":"post","link":"https:\/\/devdoge.org\/?p=542","title":{"rendered":"\u5b9a\u5236Bean\u7684\u884c\u4e3a"},"content":{"rendered":"\n

\u751f\u547d\u5468\u671f\u8c03\u7528\uff1a\u901a\u8fc7\u5b9e\u73b0InitializingBean<\/strong>\u548cDisposableBean<\/strong>\u63a5\u53e3\u5b9e\u73b0\u3002<\/p>\n\n\n\n

\u5982\u679c\u8981\u51cf\u4f4e\u4ee3\u7801\u548cSpring\u6846\u67b6\u7684\u8026\u5408\u7a0b\u5ea6\uff0c\u8003\u8651\u4f7f\u7528\u6ce8\u89e3\u3002<\/p>\n\n\n\n

org.springframework.beans.factory.InitializingBean<\/strong>\u63a5\u53e3\u7528\u4e8e\u521d\u59cb\u5316\uff0c\u53ea\u6709\u4e00\u4e2a\u65b9\u6cd5\uff1a<\/p>\n\n\n\n

void afterPropertiesSet() throws Exception;<\/code><\/pre>\n\n\n\n
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<bean id=\"exampleInitBean\" class=\"examples.ExampleBean\" init-method=\"init\"\/><\/code><\/pre>\n\n\n\n
org.springframework.beans.factory.DisposableBean<\/strong>\u63a5\u53e3\u7528\u4e8e\u9500\u6bc1\uff0c\u53ea\u6709\u4e00\u4e2a\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
void destroy() throws Exception;<\/code><\/pre>\n\n\n\n
\u5f53\u5bb9\u5668\u88ab\u9500\u6bc1\u524d<\/strong>\u8c03\u7528\u3002\u5efa\u8bae\u4f7f\u7528JSR-250\u6ce8\u89e3@PreDestroy<\/strong><\/code><\/code>\u3002xml\u914d\u7f6e\u5143\u6570\u636e\u6587\u4ef6\u4e2d\u53ef\u4ee5\u8bbe\u7f6e<bean\/>\u5143\u7d20\u7684destroy-method<\/strong>\u5c5e\u6027\uff1a<\/p>\n\n\n\n
<bean id=\"exampleInitBean\" class=\"examples.ExampleBean\" destroy-method=\"cleanup\"\/><\/code><\/pre>\n\n\n\n
destroy-method<\/strong>\u5c5e\u6027\u6709\u4e00\u4e2a\u7279\u6b8a\u503c\uff1ainferred<\/strong>\uff0c\u81ea\u52a8\u68c0\u6d4bpublic\u7684<\/strong>\u540d\u4e3aclose<\/code>\u6216shutdown<\/code><\/strong>\u65b9\u6cd5\u3002
\u5b9e\u73b0java.lang.AutoCloseable<\/strong><\/code>\u6216java.io.Closeable<\/strong><\/code>\u63a5\u53e3\u7684\u7c7b\u4e5f\u4f1a\u88ab\u5339\u914d\u3002<\/p>\n\n\n\n
\u9ed8\u8ba4\u521d\u59cb\u5316\u548c\u9500\u6bc1\u65b9\u6cd5\uff1a<\/em><\/strong><\/p>\n\n\n\n
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default-init-method
default-destroy-method<\/strong>
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Spring\u63d0\u4f9b\u4e09\u79cd\u65b9\u5f0f\u63a7\u5236bean\u7684\u751f\u547d\u5468\u671f\u3002
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\u8c03\u7528\u987a\u5e8f\uff1a
@PostConstruct<\/strong>\u6216@PreDestroy<\/strong>\uff0c
InitializingBean<\/strong>\u6216DisposableBean<\/strong>\u63a5\u53e3\u7684\u65b9\u6cd5\uff0c
init-method<\/strong><\/code>\u548cdestroy-method<\/strong><\/code>\u5c5e\u6027\u58f0\u660e\u7684\u65b9\u6cd5\u3002<\/p>\n\n\n\n
\u542f\u52a8\u548c\u5173\u95ed\u56de\u8c03<\/strong><\/p>\n\n\n\n
Lifecycle\u63a5\u53e3\u5b9a\u4e49\u4e86\u7279\u5b9a\u751f\u547d\u5468\u671f\u9700\u6c42\u7684\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
public interface Lifecycle {\n\n    void start();\n\n    void stop();\n\n    boolean isRunning();\n}<\/code><\/pre>\n\n\n\n
\u4efb\u4f55Spring\u7ba1\u7406\u7684\u5bf9\u8c61\u90fd\u53ef\u4ee5\u5b9e\u73b0Lifecycle\u63a5\u53e3\uff0c\u5f53\u5bb9\u5668\u6536\u5230\u4e86start\u6216stop\u5c31\u4f1a\u8c03\u7528\u76f8\u5e94\u7684\u65b9\u6cd5\uff0c
\u901a\u8fc7\u59d4\u6258\u7ed9LifecycleProcessor\u5b9e\u73b0\u3002LifecycleProcessor\u7684\u5b9a\u4e49\uff1a<\/p>\n\n\n\n
public interface LifecycleProcessor extends Lifecycle {\n\n    void onRefresh();\n\n    void onClose();\n}<\/code><\/pre>\n\n\n\n
org.springframework.context.Lifecycle<\/strong>\u4e0d\u4f1a\u5728\u5bb9\u5668\u5237\u65b0\u65f6\u81ea\u52a8\u8c03\u7528\uff0c\u53ef\u4ee5\u8003\u8651\uff1a
org.springframework.context.SmartLifecycle<\/strong>\u3002<\/p>\n\n\n\n
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shutdown\u52a8\u4f5c\u65f6\uff0cLifecycle\u7c7b\u578bbean\u4f1a\u5728\u9500\u6bc1\u524d\u6536\u5230stop\u4fe1\u53f7\u3002\u4f46\u662frefresh\u52a8\u4f5c\u53ea\u4f1a\u8c03\u7528\u9500\u6bc1\u65b9\u6cd5\u3002<\/p>\n\n\n\n
SmartLifecycle\u63a5\u53e3\u7684\u5b9a\u4e49\uff1a<\/strong><\/p>\n\n\n\n
public interface SmartLifecycle extends Lifecycle, Phased {\n\n    boolean isAutoStartup();\n\n    void stop(Runnable callback);\n}<\/code><\/pre>\n\n\n\n
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Phased\u63a5\u53e3\u5b9a\u4e49\uff1a<\/p>\n\n\n\n
public interface Phased {\n\n    int getPhase();\n}<\/code><\/pre>\n\n\n\n
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getPhase\u65b9\u6cd5\u8fd4\u56deInteger.MIN_VALUE\u7684\u5bf9\u8c61\u6700\u5148\u542f\u52a8\u548c\u6700\u540e\u5173\u95ed\u3002
MAX_VALUE\u5c31\u53cd\u8fc7\u6765\uff0c\u6700\u540e\u542f\u52a8\uff0c\u6700\u5148\u5173\u95ed\u3002
\u666e\u901a\u7684Lifecycle\u7c7b\u578b\u5bf9\u8c61\u8c03\u7528getPhase\u8fd4\u56de0.
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SmartLifecycle\u63a5\u53e3\u7684stop\u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u56de\u8c03\u53c2\u6570\uff0c\u5728shutdown\u8fc7\u7a0b\u7ed3\u675f\u540e\u8c03\u7528\u3002
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\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u540d\u4e3alifecycleProcessor\u7684bean\u6ce8\u5165\u5230\u5bb9\u5668\u5373\u53ef\u3002<\/p>\n\n\n\n
\u6216\u8005\u7528xml\u914d\u7f6e\uff1a<\/p>\n\n\n\n
<bean id=\"lifecycleProcessor\" class=\"org.springframework.context.support.DefaultLifecycleProcessor\">\n    <!-- timeout value \u5c5e\u6027\u5355\u4f4d\u662f\u6beb\u79d2 -->\n    <property name=\"timeoutPerShutdownPhase\" value=\"10000\"\/>\n<\/bean><\/code><\/pre>\n\n\n\n
\u5f53\u5bb9\u5668\u5237\u65b0\u65f6\u4f1a\u8c03\u7528SmartLifecycle\u7c7b\u578bbean\u7684isAutoStartup\u65b9\u6cd5\uff0c\u5982\u679c\u8fd4\u56detrue\u5c31\u4f1a\u542f\u52a8\u8fd9\u4e2a\u5bf9\u8c61\u3002<\/p>\n\n\n\n
\u5e73\u7a33\u5173\u95ed\u975eweb IoC\u5bb9\u5668\uff1a<\/strong><\/p>\n\n\n\n
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ApplicationContextAware<\/strong><\/code>\u548c<\/strong>BeanNameAware<\/strong><\/code><\/p>\n\n\n\n
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org.springframework.context.ApplicationContextAware<\/strong>
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public interface ApplicationContextAware {\n    void setApplicationContext(ApplicationContext applicationContext) throws BeansException;\n}<\/code><\/pre>\n\n\n\n
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orgorg.springframework.beans.factory.BeanNameAware<\/strong>
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public interface BeanNameAware {\n    void setBeanName(String name) throws BeansException;\n}<\/code><\/pre>\n\n\n\n
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