{"id":611,"date":"2021-11-01T18:48:30","date_gmt":"2021-11-01T10:48:30","guid":{"rendered":"https:\/\/explause.com\/?p=611"},"modified":"2021-11-01T18:48:30","modified_gmt":"2021-11-01T10:48:30","slug":"applicationcontext%e7%9a%84%e9%a2%9d%e5%a4%96%e5%8a%9f%e8%83%bd","status":"publish","type":"post","link":"https:\/\/devdoge.org\/?p=611","title":{"rendered":"ApplicationContext\u7684\u989d\u5916\u529f\u80fd"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">org.springframework.context\u5305\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u529f\u80fd\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u901a\u8fc7<code>MessageSource<\/code>\u63a5\u53e3\u5b9e\u73b0\u56fd\u9645\u5316\u3002<\/li><li>\u901a\u8fc7<code>ResourceLoader<\/code>\u63a5\u53e3\u5b58\u53d6\u50cfURLs\u3001\u6587\u4ef6\u4e4b\u7c7b\u7684\u8d44\u6e90\u3002<\/li><li>\u901a\u8fc7<code>ApplicationEventPublisher<\/code>\u63a5\u53e3\u53d1\u5e03\u4e8b\u4ef6\u7ed9\u5b9e\u73b0ApplicationListener\u63a5\u53e3\u7684bean\u3002<\/li><li>\u901a\u8fc7<code>HierarchicalBeanFactory<\/code>\u63a5\u53e3\u8bfb\u53d6\u591a\u4e2a\u5177\u6709\u5c42\u7ea7\u5173\u7cfb\u7684context\u3002<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>\u4f7f\u7528MessageSource\u8fdb\u884c\u56fd\u9645\u5316\uff1a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ApplicationContext\u63a5\u53e3extends\u4e86\u4e00\u4e2a\u540d\u53ebMessageSource\u7684\u63a5\u53e3\uff0c\u4ee5\u63d0\u4f9b\u56fd\u9645\u5316\u652f\u6301\u3002<br>Spring\u8fd8\u63d0\u4f9b\u4e86HierarchicalMessageSource\u63a5\u53e3\u7528\u4e8e\u89e3\u6790\u5c42\u6b21\u7684message\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e9b\u63a5\u53e3\u5185\u7684\u90e8\u5206\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String getMessage(String code, Object&#91;] args, String default, Locale loc);\nString getMessage(String code, Object&#91;] args, Locale loc);\nString getMessage(MessageSourceResolvable resolvable, Locale locale);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53ApplicationContext\u88ab\u88c5\u8f7d\u65f6\uff0c\u5b83\u4f1a\u81ea\u52a8\u641c\u7d22\u4e00\u4e2a\u540d\u4e3amessageSource\u7684MessageSource\u7c7b\u578bbean\u3002<br>\u5982\u679c\u627e\u4e0d\u5230\uff0cApplicationContext\u5c31\u4f1a\u5728\u7236\u7ea7\u5bb9\u5668\u91cc\u5bfb\u627e\uff0c\u5982\u679c\u8fd8\u662f\u627e\u4e0d\u5230\u5c31\u751f\u6210\u4e00\u4e2a\u7a7a\u7684DelegatingMessageSource\u5b9e\u4f8b\uff0c\u7528\u4e8e\u5904\u7406\u63a5\u53e3\u63d0\u4f9b\u7684\u65b9\u6cd5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Spring\u63d0\u4f9b\u4e09\u79cdMessageSource\u5b9e\u73b0\uff1aResourceBundleMessageSource\u3001ReloadableResourceBundleMessageSource\u548cStaticMessageSource\uff0c\u4e09\u4e2a\u90fd\u5b9e\u73b0\u4e86HierarchicalMessageSource\u63a5\u53e3\u4ee5\u5b8c\u6210\u5d4c\u5957\u6d88\u606f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">StaticMessageSource\u5f88\u5c11\u4f7f\u7528\uff0c\u4f46\u662f\u63d0\u4f9b\u4e86\u7f16\u7a0b\u5f0f\u6dfb\u52a0\u6d88\u606f\u7684\u529f\u80fd\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\u4f7f\u7528ResourceBundleMessageSource\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;beans>\n    &lt;bean id=\"messageSource\" class=\"org.springframework.context.support.ResourceBundleMessageSource\">\n        &lt;property name=\"basenames\">\n            &lt;list>\n                &lt;value>format&lt;\/value>\n                &lt;value>exceptions&lt;\/value>\n                &lt;value>windows&lt;\/value>\n            &lt;\/list>\n        &lt;\/property>\n    &lt;\/bean>\n&lt;\/beans><\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u9762\u7684\u914d\u7f6e\u5047\u5b9a\u5728<strong>classpath<\/strong>\u4e0a\u6709\u4e09\u4e2a\u8d44\u6e90\u5305\uff0c\u540d\u5b57\u5206\u522b\u662fformat\u3001exceptions\u548cwindows\u3002<br>\u89e3\u6790\u6d88\u606f\u662f\u7528\u4e00\u79cdJDK\u6807\u51c6\u7684\u65b9\u5f0f\uff0c\u901a\u8fc7ResourceBundle\u5bf9\u8c61\u5b8c\u6210\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># in format.properties\nmessage=Alligators rock!\n# in exceptions.properties\nargument.required=The {0} argument is required.<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7531\u4e8eApplicationContext\u5b9e\u73b0\u4e5f\u5b9e\u73b0\u4e86MessageSource\uff0c\u6240\u4ee5ApplicationContext\u53ef\u4ee5\u8f6c\u6362\u6210MessageSource\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public static void main(String&#91;] args) {\n    MessageSource resources = new ClassPathXmlApplicationContext(\"beans.xml\");\n    String message = resources.getMessage(\"message\", null, \"Default\", Locale.ENGLISH);\n    System.out.println(message);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\u5c06\u53c2\u6570\u4f20\u9012\u7ed9message\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Example {\n\n    private MessageSource messages;\n\n    public void setMessages(MessageSource messages) {\n        this.messages = messages;\n    }\n\n    public void execute() {\n        String message = this.messages.getMessage(\"argument.required\",\n            new Object &#91;] {\"userDao\"}, \"Required\", Locale.ENGLISH);\n        System.out.println(message);\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u540e\u4f1a\u8f93\u51fa\uff1a<strong>The userDao argument is required.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8003\u8651\u5230\u56fd\u9645\u5316\uff0cSpring\u7684\u5404\u79cdMessageSource\u5b9e\u73b0\u90fd\u548c\u6807\u51c6JDK\u7684ResourceBundle\u6709\u76f8\u540c\u7684\u89e3\u6790\u548c\u56de\u8c03\u89c4\u5219\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6bd4\u5982\u8981\u4f7f\u7528\u82f1\u56fd\u672c\u5730\u5316\u8bbe\u7f6e\uff08en-GB\uff09\uff0c\u53ef\u4ee5\u5c06\u8d44\u6e90\u6587\u4ef6\u540d\u540d\u6210format_en_GB.properties\u3001exceptions_en_GB.properties\u548cwindows_en_GB.properties\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6bd4\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># in exceptions_en_GB.properties\nargument.required=Ebagum lad, the ''{0}'' argument is required, I say, required.<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>public static void main(final String&#91;] args) {\n    MessageSource resources = new ClassPathXmlApplicationContext(\"beans.xml\");\n    String message = resources.getMessage(\"argument.required\",\n        new Object &#91;] {\"userDao\"}, \"Required\", Locale.UK);\n    System.out.println(message);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f1a\u8f93\u51fa\uff1a<strong>Ebagum lad, the &#8216;userDao&#8217; argument is required, I say, required.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e5f\u53ef\u4ee5\u4f7f\u7528MessageSourceAware\u63a5\u53e3\u83b7\u5f97\u4e00\u4e2a\u5df2\u7ecf\u88ab\u5b9a\u4e49\u7684MessageSource\u5f15\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\uff1aSpring\u7684MessageSource\u57fa\u4e8eJava\u7684ResourceBundle\uff0c\u5982\u679c<meta charset=\"utf-8\">basename\u76f8\u540c\uff0c\u5e76\u4e0d\u4f1a\u81ea\u52a8\u8fc1\u79fb\uff0c\u800c\u662f\u4f7f\u7528\u7b2c\u4e00\u4e2a\u53d1\u73b0\u7684bundle\uff0c\u5269\u4e0b\u7684\u5ffd\u7565\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f5c\u4e3aResourceBundleMessageSource\u7684\u66ff\u4ee3\uff0cSpring\u63d0\u4f9b\u4e86ReloadableResourceBundleMessageSource\u7c7b\uff0c\u6bd4\u6807\u51c6JDK\u66f4\u6709\u62d3\u5c55\u6027\uff0c\u5141\u8bb8\u4ece\u4efb\u610fSpring\u8d44\u6e90\u76ee\u5f55\u8bfb\u53d6\u6587\u4ef6\uff0c\u800c\u4e14\u652f\u6301\u70ed\u66f4\u65b0\u3002<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>\u6807\u51c6\/\u5b9a\u5236\u4e8b\u4ef6\uff1a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e8b\u4ef6\u5904\u7406\u901a\u8fc7ApplicationEvent\u7c7b\u548cApplicationListener\u63a5\u53e3\u5b9e\u73b0\u3002<br>\u5982\u679c\u4e00\u4e2abean\u5b9e\u73b0\u4e86ApplicationListener\u63a5\u53e3\u800c\u4e14\u88ab\u90e8\u7f72\u8fdb\u5bb9\u5668\uff0c\u90a3\u4e48\u6bcf\u6b21ApplicationEvent\u88ab\u53d1\u5e03\u5230ApplicationContext\u5185\uff0c\u8fd9\u4e2abean\u90fd\u4f1a\u88ab\u63d0\u9192\u3002\u6807\u51c6\u7684\u89c2\u5bdf\u8005\u6a21\u5f0f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Spring\u5185\u7f6e\u4e8b\u4ef6\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table aligncenter is-style-stripes\"><table><tbody><tr><td>ContextRefreshedEvent<\/td><td>\u5f53ApplicationContext\u88ab\u521d\u59cb\u5316\u6216\u8005\u624b\u52a8\u8c03\u7528refresh()\u65b9\u6cd5\u3002<br>\u521d\u59cb\u5316\u610f\u601d\u662f\u6240\u6709\u7684singleten\u4f5c\u7528\u57dfbean\u90fd\u88ab\u88c5\u8f7d\uff0c<br>post-processor\u90fd\u88ab\u68c0\u6d4b\u5e76\u88c5\u8f7d\uff0cApplicationContext\u53ef\u7528\u3002<\/td><\/tr><tr><td>ContextStartedEvent<\/td><td>\u5f53ApplicationContext\u8c03\u7528\u4e86start()\u65b9\u6cd5\uff0cstarted\u610f\u601d\u662f\u6240\u6709<br><code>Lifecycle<\/code>&nbsp;bean\u90fd\u6536\u5230\u660e\u786e\u7684start\u4fe1\u53f7\uff0c\u901a\u5e38\u7528\u4e8e\u91cd\u542fbean\u3002<\/td><\/tr><tr><td>ContextStoppedEvent<\/td><td>\u5f53ApplicationContext\u8c03\u7528\u4e86stop()\uff0cstopped\u610f\u601d\u662f\u6240\u6709<br><code>Lifecycle<\/code>&nbsp;bean\u90fd\u6536\u5230\u660e\u786e\u7684stop\u4fe1\u53f7\uff0c\u53ef\u88abstart()\u91cd\u542f\u3002<\/td><\/tr><tr><td>ContextClosedEvent<\/td><td>\u5f53ApplicationContext\u8c03\u7528\u4e86close()\u6216\u8005\u901a\u8fc7JVM shutdown hook\u3002<br>closed\u610f\u601d\u662f\u6240\u6709\u7684singleton\u4f5c\u7528\u57dfbean\u5c06\u4f1a\u88ab\u9500\u6bc1\uff0c\u800c\u4e14\u65e0\u6cd5\u91cd\u542f\u3002<\/td><\/tr><tr><td>RequestHandledEvent<\/td><td>web\u4e13\u7528\u4e8b\u4ef6\uff0c\u8868\u793a\u670d\u52a1\u4e86\u4e00\u4e2aHTTP\u8bf7\u6c42\uff0c\u5728\u8bf7\u6c42\u5b8c\u6210\u540e\u53d1\u5e03\u3002<\/td><\/tr><tr><td>ServletRequestHandledEvent<\/td><td>RequestHandledEvent\u7684\u5b50\u7c7b\uff0c\u6dfb\u52a0\u4e86Servlet\u4e13\u7528\u4e0a\u4e0b\u6587\u4fe1\u606f\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ee7\u627fSpring\u7684ApplicationEvent\u7c7b\u53ef\u4ee5\u5b9e\u73b0\u81ea\u5b9a\u4e49\u4e8b\u4ef6\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class BlockedListEvent extends ApplicationEvent {\n\n    private final String address;\n    private final String content;\n\n    public BlockedListEvent(Object source, String address, String content) {\n        super(source);\n        this.address = address;\n        this.content = content;\n    }\n    \/\/ \u5176\u5b83\u5185\u5bb9\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u521b\u5efa\u4e00\u4e2a\u7c7b\uff0c\u5b9e\u73b0ApplicationEventPublisherAware\u63a5\u53e3\uff0c\u5e76\u6ce8\u518c\u4e3abean\uff0c\u8c03\u7528ApplicationEventPublisher\u7684publishEvent()\u65b9\u6cd5\u53d1\u5e03\u5b9a\u5236\u7684\u4e8b\u4ef6\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class EmailService implements ApplicationEventPublisherAware {\n\n    private List&lt;String> blockedList;\n    private ApplicationEventPublisher publisher;\n\n    public void setBlockedList(List&lt;String> blockedList) {\n        this.blockedList = blockedList;\n    }\n\n    public void setApplicationEventPublisher(ApplicationEventPublisher publisher) {\n        this.publisher = publisher;\n    }\n\n    public void sendEmail(String address, String content) {\n        if (blockedList.contains(address)) {\n            publisher.publishEvent(new BlockedListEvent(this, address, content));\n            return;\n        }\n        \/\/ send email...\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u914d\u7f6e\u65f6\uff0c\u5bb9\u5668\u68c0\u6d4b\u5230\u5b9e\u73b0ApplicationEventPublisherAware\u63a5\u53e3\uff0c\u4f1a\u81ea\u52a8\u8c03\u7528setApplicationEventPublisher()\u65b9\u6cd5\u3002\u5728\u73b0\u5b9e\u4e2d\uff0c\u4f20\u5165\u7684\u53c2\u6570\u5c31\u662f\u5bb9\u5668\u81ea\u5df1\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8981\u63a5\u6536\u81ea\u5b9a\u4e49\u4e8b\u4ef6\uff0c\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u7c7b\uff0c\u5b9e\u73b0ApplicationListener\u63a5\u53e3\uff0c\u5e76\u6ce8\u518c\u6210bean\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class BlockedListNotifier implements ApplicationListener&lt;BlockedListEvent> {\n\n    private String notificationAddress;\n\n    public void setNotificationAddress(String notificationAddress) {\n        this.notificationAddress = notificationAddress;\n    }\n\n    public void onApplicationEvent(BlockedListEvent event) {\n        \/\/ \u4e00\u987f\u64cd\u4f5c...\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7531\u4e8eApplicationListener\u662f\u6cdb\u578b\u63a5\u53e3\uff0c\u6240\u4ee5\u9700\u8981\u4f20\u5165\u7c7b\u578b\u4fe1\u606f\uff0c<meta charset=\"utf-8\">onApplicationEvent\u65b9\u6cd5\u662f\u7c7b\u578b\u5b89\u5168\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/explause.com\/?p=255\">\u4f8b\u5b50\u5728\u8fd9\u91cc<\/a>\u3002\u53ef\u4ee5\u60f3\u6ce8\u518c\u51e0\u4e2a\u4e8b\u4ef6\u76d1\u542c\u5668\u5c31\u6ce8\u518c\u51e0\u4e2a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9ed8\u8ba4\uff0c\u4e8b\u4ef6\u76d1\u542c\u5668\u4ee5\u540c\u6b65\u65b9\u5f0f\u63a5\u6536\u4e8b\u4ef6\uff0c\u5355\u7ebf\u7a0b\u8fd0\u884c\uff0c\u6240\u4ee5\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u4e00\u4e2a\u4f18\u52bf\u662f\u5f53\u76d1\u542c\u5668\u63a5\u6536\u5230\u4e00\u4e2a\u4e8b\u4ef6\uff0c\u5982\u679c\u4e8b\u52a1\u53ef\u7528\uff0c\u5b83\u5c31\u5728\u53d1\u5e03\u8005\u7684transaction context\u5185\u8fd0\u884c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Spring\u7684\u4e8b\u52a1\u673a\u5236\u8bbe\u8ba1\u7528\u4e8e\u7b80\u5355\u7684\u5bb9\u5668\u5185bean\u4e4b\u95f4\u7684\u901a\u4fe1\u3002\u7528\u4e8e\u4f01\u4e1a\u7ea7\u5e94\u7528\u53ef\u4ee5\u8003\u8651\u4f7f\u7528<a href=\"https:\/\/projects.spring.io\/spring-integration\/\">Spring Integration<\/a>\u9879\u76ee\u3002<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>\u57fa\u4e8e\u6ce8\u89e3\u7684\u4e8b\u4ef6\u76d1\u542c<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c06bean\u5b9a\u4e49\u5185\u7684\u65b9\u6cd5\u6ce8\u518c\u6210\u4e00\u4e2a\u4e8b\u4ef6\u5904\u7406\u5668\uff0c\u4f7f\u7528@EventListener\u6ce8\u89e3:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class BlockedListNotifier {\n\n    private String notificationAddress;\n\n    public void setNotificationAddress(String notificationAddress) {\n        this.notificationAddress = notificationAddress;\n    }\n\n    @EventListener\n    public void processBlockedListEvent(BlockedListEvent event) {\n        \/\/ notify appropriate parties via notificationAddress...\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u58f0\u660e\u7684\u65b9\u6cd5\u53ea\u9700\u8981\u4e8b\u4ef6\u7c7b\u578b\u53c2\u6570\uff0c\u800c\u4e0d\u9700\u8981\u5b9e\u73b0\u7279\u522b\u7684\u63a5\u53e3\u3002<br>\u5982\u679c\u8981\u76d1\u542c\u591a\u4e2a\u4e8b\u4ef6\uff0c\u53c8\u4e0d\u60f3\u65b9\u6cd5\u53c2\u6570\u592a\u591a\uff0c\u5c31\u5728\u6ce8\u89e3\u5185\u58f0\u660e\u4e00\u4e2a\u6570\u7ec4\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@EventListener({ContextStartedEvent.class, ContextRefreshedEvent.class})\npublic void handleContextStart() {\n    \/\/ ...\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u901a\u8fc7@EventListener\u7684condition\u5c5e\u6027\u58f0\u660eSpEL\u6dfb\u52a0\u4e00\u4e2a\u8fd0\u884c\u65f6\u8fc7\u6ee4\u5668\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@EventListener(condition = \"#blEvent.content == 'my-event'\")\npublic void processBlockedListEvent(BlockedListEvent blEvent) {\n    \/\/ notify appropriate parties via 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class=\"wp-block-paragraph\">\u6ce8\u610f#root.event\u53ef\u4ee5\u8bbf\u95ee\u5230\u5e95\u5c42\u4e8b\u4ef6\uff0c\u5373\u4f7f\u65b9\u6cd5\u7b7e\u540d\u662f\u522b\u7684\u5bf9\u8c61\u7684\u5f15\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u60f3\u5728\u65b9\u6cd5\u7ed3\u675f\u540e\u89e6\u53d1\u4e00\u4e2a\u4e8b\u4ef6\uff0c\u53ea\u8981\u8bbe\u7f6e\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u4e8b\u4ef6\u7c7b\u578b\u5c31\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@EventListener\npublic ListUpdateEvent handleBlockedListEvent(BlockedListEvent event) {\n    \/\/ notify appropriate parties via notificationAddress and\n    \/\/ then publish a ListUpdateEvent...\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\uff0c\u4e0d\u652f\u6301asynchronous listeners\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u901a\u8fc7\u8fd4\u56deCollection\u6216\u8005\u4e00\u4e2a\u6570\u7ec4\u6765\u53d1\u9001\u591a\u4e2a\u4e8b\u4ef6\u3002<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>\u5f02\u6b65\u76d1\u542c\u5668<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6dfb\u52a0@Async\u6ce8\u89e3\u5373\u53ef\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@EventListener\n@Async\npublic void processBlockedListEvent(BlockedListEvent event) {\n    \/\/ BlockedListEvent is processed in a separate thread\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\u6709\u4e00\u4e9b\u9650\u5236\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5982\u679c\u5f02\u6b65\u4e8b\u4ef6\u76d1\u542c\u5668\u629b\u51fa\u5f02\u5e38\uff0c\u662f\u4e0d\u4f1a\u4f20\u64ad\u7ed9\u8c03\u7528\u8005\u7684\u3002<\/li><li>\u4e0d\u80fd\u901a\u8fc7\u65b9\u6cd5\u8fd4\u56de\u4e8b\u4ef6\u7c7b\u578b\u53d1\u5e03\u4e8b\u4ef6\u3002<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>\u7ed9\u76d1\u542c\u5668\u6392\u5e8f\uff1a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6bd4\u5982\u5728\u4e00\u4e2a\u76d1\u542c\u5668\u4e4b\u524d\u8c03\u7528\u53e6\u5916\u4e00\u4e2a\u76d1\u542c\u5668\uff0c\u4f7f\u7528@Order\u6ce8\u89e3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@EventListener\n@Order(42)\npublic void processBlockedListEvent(BlockedListEvent event) {\n    \/\/ notify appropriate parties via notificationAddress...\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>\u4fbf\u6377\u8bbf\u95ee\u5e95\u5c42\u8d44\u6e90<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u4e2a\u5bb9\u5668\u5c31\u662f\u4e00\u4e2aResourceLoader\uff0c\u53ef\u4ee5\u8f7d\u5165Resource\u5bf9\u8c61\u3002<br>Resource\u7c7b\u578b\u5c31\u662f\u529f\u80fd\u66f4\u4e30\u5bcc\u7684JDK java.net.URL\u7c7b\u578b\u3002<br>\u4e8b\u5b9e\u4e0a\u4e5f\u662f\uff0cResource\u7c7b\u5185\u90e8\u5305\u88c5\u4e86\u4e00\u4e2ajava.net.URL\u5b9e\u4f8b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Resource\u53ef\u4ee5\u900f\u660e\u5730\u8bbf\u95ee\u51e0\u4e4e\u4efb\u4f55\u4f4d\u7f6e\u7684\u5e95\u5c42\u8d44\u6e90\uff0c<br>\u50cfclasspath\u3001\u6587\u4ef6\u7cfb\u7edf\u4f4d\u7f6e\u7b49\u53ef\u4ee5\u7528\u6807\u51c6URL\u6216\u5b83\u7684\u53d8\u79cd\u8868\u8ff0\u7684\u4efb\u4f55\u4f4d\u7f6e\u3002<br>\u5982\u679c\u8d44\u6e90\u4f4d\u7f6e\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u5b57\u7b26\u4e32\uff0c\u6ca1\u6709\u7279\u6b8a\u7684\u524d\u7f00\uff0c\u90a3\u4e48\u8d44\u6e90\u4ece\u54ea\u91cc\u6765\u53d6\u51b3\u4e8e\u5177\u4f53\u7684\u5bb9\u5668\u7c7b\u578b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">bean\u53ef\u4ee5\u901a\u8fc7\u5b9e\u73b0ResourceLoaderAware\u63a5\u53e3\uff0c\u5728\u521d\u59cb\u5316\u65f6\u5c06ApplicationContext\u8f6c\u6362\u6210ResourceLoader\u5e76\u6ce8\u5165bean\u3002\u53ef\u4ee5\u5c06Resource\u5c5e\u6027\u58f0\u660e\u4e3aString\uff0c\u53ef\u4ee5\u81ea\u52a8\u8f6c\u6362\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f20\u9012\u7ed9ApplicationContext\u6784\u9020\u5668\u7684\u4f4d\u7f6e\u6216\u8005\u8def\u5f84\u5b9e\u9645\u4e0a\u90fd\u662f\u8def\u5f84\u5b57\u7b26\u4e32\uff0c\u4ee5\u7b80\u5355\u7684\u65b9\u5f0f\u88ab\u5bb9\u5668\u6b63\u786e\u5904\u7406\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u5728\u8def\u5f84\u5b57\u7b26\u4e32\u5185\u6dfb\u52a0\u7279\u5b9a\u7684\u524d\u7f00\u6765\u5f3a\u5236\u4ece\u4ec0\u4e48\u5730\u65b9\u8f7d\u5165\u5b9a\u4e49\uff0c\u5982classpath:\u3002<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>\u5e94\u7528\u542f\u52a8\u8fc7\u7a0b\u8ddf\u8e2a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u590d\u6742\u7684\u7a0b\u5e8f\u6709\u590d\u6742\u7684\u542f\u52a8\u8fc7\u7a0b\uff0c\u8ffd\u8e2a\u542f\u52a8\u8fc7\u7a0b\u53ef\u4ee5\u5e2e\u52a9\u5206\u6790\u542f\u52a8\u65f6\u95f4\u82b1\u5728\u4ec0\u4e48\u5730\u65b9\uff0c<br>\u4e5f\u53ef\u4ee5\u5e2e\u52a9\u7406\u89e3\u5206\u6790\u6574\u4e2a\u5bb9\u5668\u7684\u751f\u547d\u5468\u671f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AbstractApplicationContext\u548c\u5176\u5b50\u7c7b\u6709ApplicationStartup\u5b9e\u4f8b\uff0c\u6536\u96c6\u542f\u52a8\u9636\u6bb5\u7684StartupStep\u6570\u636e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5bb9\u5668\u751f\u547d\u5468\u671f\u9636\u6bb5\uff1b<\/li><li>bean\u751f\u547d\u5468\u671f\u9636\u6bb5\uff1b<\/li><li>\u5e94\u7528\u4e8b\u4ef6\u5904\u7406\uff1b<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u88c5\u5907\u5728AnnotationConfigApplicationContext\u5185\u7684\u4f8b\u5b50\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a\u542f\u52a8step\u5e76\u5f00\u59cb\u8bb0\u5f55\nStartupStep scanPackages = this.getApplicationStartup().start(\"spring.context.base-packages.scan\");\n\/\/ \u5728\u5f53\u524d<meta charset=\"utf-8\">step\u6dfb\u52a0\u6807\u8bb0\nscanPackages.tag(\"packages\", () -> Arrays.toString(basePackages));\n\/\/ \u6267\u884c\u88c5\u914d\u7684\u5b9e\u9645\u9636\u6bb5\nthis.scanner.scan(basePackages);\n\/\/ \u7ed3\u675f\u5f53\u524d<meta charset=\"utf-8\">step\nscanPackages.end();<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bb9\u5668\u5df2\u7ecf\u88c5\u914d\u4e86\u591a\u4e2a\u6b65\u9aa4\uff0c\u5f53\u5f00\u59cb\u8bb0\u5f55\u65f6\uff0c\u8fd9\u4e9b\u6b65\u9aa4\u90fd\u53ef\u4ee5\u88ab\u76f8\u5e94\u7684\u5de5\u5177\u6536\u96c6\u3001\u663e\u793a\u548c\u5206\u6790\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9ed8\u8ba4\u7684ApplicationStartup\u5b9e\u73b0\u662f\u4e00\u4e2a\u6ca1\u6709\u64cd\u4f5c\u7684\u53d8\u79cd\uff0c\u662f\u4e3a\u4e86\u6700\u5c0f\u7684\u5f00\u9500\u3002\u4e5f\u5c31\u662f\u9ed8\u8ba4\u4e0d\u4f1a\u6536\u96c6\u542f\u52a8\u6b65\u9aa4\u3002Spring\u81ea\u5e26\u4e86\u4e00\u4e2a\u5b9e\u73b0\uff1aFlightRecorderApplicationStartup\u3002\u8981\u4f7f\u7528\u8fd9\u4e2a\u53d8\u79cd\u5c31\u8981\u5728\u5bb9\u5668\u521b\u5efa\u4e4b\u540e\u5c3d\u5feb\u5c06\u5b83\u914d\u7f6e\u8fdb\u5bb9\u5668\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ApplicationStartup\u4ec5\u7528\u4e8e\u5e94\u7528\u542f\u52a8\u9636\u6bb5\uff0c\u5e76\u4e14\u4ec5\u7528\u4e8e\u6838\u5fc3\u5bb9\u5668\uff0c\u800c\u4e0d\u662f\u53d6\u4ee3\u522b\u7684java\u6d4b\u91cf\u5e93\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8981\u5f00\u59cb\u6536\u96c6\u5b9a\u5236\u7684StartupStep\uff0c\u7ec4\u4ef6\u53ef\u4ee5\u5b9e\u73b0ApplicationStartupAware\u63a5\u53e3\u76f4\u63a5\u83b7\u5f97ApplicationStartup\u5b9e\u4f8b\u6216\u8005\u5728\u6ce8\u5165\u70b9\u8bf7\u6c42ApplicationStartup\u7c7b\u578b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\u4e0d\u80fd\u4f7f\u7528&#8221;spring.*&#8221;\u4f5c\u7528\u57df\uff0c\u8fd9\u662fSpring\u4fdd\u7559\u7684\uff0c\u7528\u4e8eSpring\u5185\u90e8\u4f7f\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>ApplicationContext\u5c31\u662f\u6838\u5fc3\u5bb9\u5668\uff0c\u5b83\u6709\u8bb8\u591a\u989d\u5916\u529f\u80fd\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[28],"class_list":["post-611","post","type-post","status-publish","format-standard","hentry","category-ioc","tag-ioc"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":6}},"_links":{"self":[{"href":"https:\/\/devdoge.org\/index.php?rest_route=\/wp\/v2\/posts\/611","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devdoge.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devdoge.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devdoge.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/devdoge.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=611"}],"version-history":[{"count":13,"href":"https:\/\/devdoge.org\/index.php?rest_route=\/wp\/v2\/posts\/611\/revisions"}],"predecessor-version":[{"id":624,"href":"https:\/\/devdoge.org\/index.php?rest_route=\/wp\/v2\/posts\/611\/revisions\/624"}],"wp:attachment":[{"href":"https:\/\/devdoge.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devdoge.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devdoge.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}