{"id":9769,"date":"2023-03-08T21:26:06","date_gmt":"2023-03-08T13:26:06","guid":{"rendered":"http:\/\/123.57.164.21\/?p=9769"},"modified":"2023-03-08T21:26:06","modified_gmt":"2023-03-08T13:26:06","slug":"%e6%89%8b%e5%8a%a8%e5%90%91spring%e5%ae%b9%e5%99%a8%e4%b8%ad%e6%b3%a8%e5%85%a5%e5%af%b9%e8%b1%a1","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=9769","title":{"rendered":"\u624b\u52a8\u5411Spring\u5bb9\u5668\u4e2d\u6ce8\u5165\u5bf9\u8c61"},"content":{"rendered":"\n

\u624b\u52a8\u5411Spring\u5bb9\u5668\u4e2d\u6ce8\u5165\u5bf9\u8c61\u7684\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u672c\u6587\u5c06\u7b80\u5355\u9610\u8ff0\u5176\u4e2d\u7684\u56db\u79cd<\/p>\n\n\n\n

1. beanFactory\u7684registerSingleton\u65b9\u6cd5<\/strong><\/p>\n\n\n\n

\n\n\n\n

\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2aBeanFactory\u7684\u540e\u7f6e\u5904\u7406\u5668\uff0c\u5728\u5176\u4e2d\u5c31\u53ef\u4ee5\u83b7\u5f97BeanFactory\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u8c03\u7528registerSingleton\u65b9\u6cd5\u3002
\u6ce8\uff1a\u6b64\u5904bean\u7684\u540d\u5b57\u53ef\u4ee5\u81ea\u5b9a\u4e49\uff0c\u5982\u8fd9\u91cc\u5c31\u5b9a\u4e49\u4e3asherlock\u3002<\/p>\n\n\n\n

@Component\npublic class SherlockBeanFactoryPostProcessor implements BeanFactoryPostProcessor {\n    @Override\n    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {\n\n        beanFactory.registerSingleton(\"sherlock\", new User(\"sherlock\", 18));\n\n    }\n}<\/pre>\n\n\n\n
\u5982\u679c\u5728\u5bb9\u5668\u4e2d\u83b7\u53d6\u8be5\u7c7b<\/p>\n\n\n\n
@Test\n    public void test() {\n        ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);\n        User sherlock = context.getBean(\"sherlock\", User.class);\n        System.out.println(sherlock.toString());\n    }<\/pre>\n\n\n\n
\u63a7\u5236\u53f0\u8f93\u51fa\uff1a<\/p>\n\n\n\n
\"\"<\/figure><\/div>\n\n\n\n
\u5bf9\u8c61\u5c31\u5df2\u6210\u529f\u6ce8\u5165\u5230Spring\u5bb9\u5668\u4e2d\u4e86\u3002
\u6ce8\uff1a\u5176\u5b9e\u5728context\u4e2d\u4e5f\u6709registerBean\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5b9e\u73b0\u4e00\u6837\u7684\u6548\u679c\u3002\uff08ApplicationContext\u5176\u5b9e\u7ee7\u627f\u4e86BeanFactory\uff0c\u6240\u4ee5\u5b83\u4e5f\u62e5\u6709Bean\u5de5\u5382\u7684\u529f\u80fd\uff0c\u9664\u6b64\u4e4b\u5916ApplicationContext\u8fd8\u7ee7\u627f\u4e86\u5f88\u591a\u5176\u4ed6\u7684\u7c7b\uff0c\u62e5\u6709\u4e00\u4e9b\u8f85\u52a9\u529f\u80fd\u3002\u603b\u7684\u6765\u8bf4\uff0cApplicationContext\u5176\u5b9e\u5305\u62ec\u4e86BeanFactory\uff09<\/p>\n\n\n\n
2. @Bean\u6ce8\u89e3<\/strong><\/p>\n\n\n\n
\n\n\n\n
\u5728\u914d\u7f6e\u7c7b\u4e2d\uff0c\u4f7f\u7528@Bean\u6ce8\u89e3\uff0c\u8fd4\u56de\u4e00\u4e2a\u60f3\u8981\u6ce8\u5165\u7684\u5bf9\u8c61\u3002@Bean\u62ec\u53f7\u4e2d\u662fbean\u7684\u540d\u5b57\uff0c\u9ed8\u8ba4\u4e3a\u7c7b\u540d\u7684\u5c0f\u5199\u5f62\u5f0f\u3002<\/p>\n\n\n\n
@Configuration\n@ComponentScan(\"com.sherlock\")\npublic class AppConfig {\n\n    @Bean(\"sherlock\")\n    public User user() {\n        return new User(\"sherlock\", 19);\n    }\n\n}<\/pre>\n\n\n\n
\u63a7\u5236\u53f0\u8f93\u51fa\uff1a<\/p>\n\n\n\n
\"\"<\/figure><\/div>\n\n\n\n
3. \u4f7f\u7528Factory\u2018Bean<\/strong><\/p>\n\n\n\n
\n\n\n\n
\u65e2\u7136\u63d0\u5230\u4e86Factory\u2018Bean\uff0c\u5c31\u4e0d\u5f97\u4e0d\u63d0\u5230BeanFactory\u3002\u5173\u4e8e\u8fd9\u4e24\u4e2a\u7684\u533a\u522b\uff0c\u53ef\u4ee5\u770b\u4e0b\u6211\u7684\u53e6\u4e00\u7bc7\u6587\u7ae0\u3002https:\/\/www.jianshu.com\/p\/91d21128d2a9<\/a>
\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u7c7b\u53bb\u5b9e\u73b0FactoryBean\u63a5\u53e3<\/p>\n\n\n\n
@Component\npublic class SherlockFactoryBean implements FactoryBean {\n\n    @Override\n    public Object getObject() throws Exception {\n        return new User(\"sherlock\", 20);\n    }\n\n    @Override\n    public Class<?> getObjectType() {\n        return User.class;\n    }\n}<\/pre>\n\n\n\n
\/\/\u6ce8\u610f\uff1a\u8fd9\u4e2abean\u7684\u540d\u5b57\u662fsherlockFactoryBean\uff0c\u4f46\u8fd4\u56de\u7684\u662fUser\u7c7b\n User user = context.getBean(\"sherlockFactoryBean\", User.class);\n<\/pre>\n\n\n\n
\u63a7\u5236\u53f0\u8f93\u51fa\uff1a<\/p>\n\n\n\n
\"\"<\/figure><\/div>\n\n\n\n
4. \u4f7f\u7528@Import\u6ce8\u89e3<\/strong><\/p>\n\n\n\n
\n\n\n\n
@Import\u53ea\u80fd\u7528\u5728\u7c7b\u4e0a \uff0c@Import\u901a\u8fc7\u5feb\u901f\u5bfc\u5165\u7684\u65b9\u5f0f\u5b9e\u73b0\u628a\u5b9e\u4f8b\u52a0\u5165spring\u7684IOC\u5bb9\u5668\u4e2d
@Import\u7684\u4e09\u79cd\u7528\u6cd5\u4e3b\u8981\u5305\u62ec\uff1a<\/p>\n\n\n\n
  • \u76f4\u63a5\u586bclass\u6570\u7ec4<\/li><\/ul>\n\n\n\n
    @Import({User.class, Order.class})<\/pre>\n\n\n\n
    User user = context.getBean(\"com.sherlock.pojo.User\", User.class);<\/pre>\n\n\n\n
    \u6ce8\u610f\uff1a\u8fd9\u6837\u6ce8\u5165\u7684\u7c7b\u540d\u4e3a\u7c7b\u7684\u5168\u9650\u5b9a\u540d\u3002<\/p>\n\n\n\n
    • ImportSelector\u65b9\u5f0f<\/li><\/ul>\n\n\n\n
      \u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\u7684\u8fd9\u4e2a\u7c7b\u5fc5\u987b\u5b9e\u73b0ImportSelector\u63a5\u53e3<\/p>\n\n\n\n
      public class SherlockImportSelector implements ImportSelector {\n\n    @Override\n    public String[] selectImports(AnnotationMetadata annotationMetadata) {\n        \/\/\u524d\u9762\u53ef\u4ee5\u662f\u548c\u4e1a\u52a1\u76f8\u5173\u7684\u903b\u8f91\n        \/\/\u8fd4\u56de\u9700\u8981\u5bfc\u5165\u7684\u7ec4\u4ef6\u7684\u5168\u7c7b\u540d\u6570\u7ec4\n        return new String[]{\"com.sherlock.pojo.User\"};\n    }\n}<\/pre>\n\n\n\n
      • ImportBeanDefintionRegister\u65b9\u5f0f\u624b\u52a8\u6ce8\u518cbean<\/li><\/ul>\n\n\n\n
        public class SherlockImportBeanDefinitionRegistrar implements ImportBeanDefinitionRegistrar {\n\n    public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {\n        \/\/\u9700\u8981\u7684\u4e1a\u52a1\u903b\u8f91\n        \/\/\u6307\u5b9abean\u5b9a\u4e49\u4fe1\u606f\uff08\u5305\u62ecbean\u7684\u7c7b\u578b\u3001\u4f5c\u7528\u57df...\uff09\n        RootBeanDefinition beanDefinition = new RootBeanDefinition();\n        beanDefinition.setBeanClass(User.class);\n        registry.registerBeanDefinition(\"user\",beanDefinition);\n    }\n}<\/pre>\n\n\n\n
        @Import\u4e09\u79cd\u65b9\u5f0f\u7684\u603b\u7ed3<\/p>\n\n\n\n
        \u7b2c\u4e00\u79cd\u7528\u6cd5\uff1a@Import\uff08{ \u8981\u5bfc\u5165\u7684\u5bb9\u5668\u4e2d\u7684\u7ec4\u4ef6 } \uff09\uff1a\u5bb9\u5668\u4f1a\u81ea\u52a8\u6ce8\u518c\u8fd9\u4e2a\u7ec4\u4ef6\uff0cid\u9ed8\u8ba4\u662f\u5168\u7c7b\u540d\n\u7b2c\u4e8c\u79cd\u7528\u6cd5\uff1aImportSelector\uff1a\u8fd4\u56de\u9700\u8981\u5bfc\u5165\u7684\u7ec4\u4ef6\u7684\u5168\u7c7b\u540d\u6570\u7ec4\uff0cspringboot\u5e95\u5c42\u7528\u7684\u7279\u522b\u591a\u3002\n\u7b2c\u4e09\u79cd\u7528\u6cd5\uff1aImportBeanDefinitionRegistrar\uff1a\u624b\u52a8\u6ce8\u518cbean\u5230\u5bb9\u5668<\/pre>\n\n\n\n
        5.\u603b\u7ed3<\/strong><\/p>\n\n\n\n
        \n\n\n\n
        • beanFactory\u7684registerSingleton\u65b9\u6cd5<\/li>
        • @Bean\u6ce8\u89e3<\/li>
        • FactoryBean<\/li>
        • @Import<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"
          \u624b\u52a8\u5411Spring\u5bb9\u5668\u4e2d\u6ce8\u5165\u5bf9\u8c61\u7684\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u672c\u6587\u5c06\u7b80\u5355\u9610\u8ff0\u5176\u4e2d\u7684\u56db\u79cd 1. beanFactory\u7684regi […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26,27],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/9769"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=9769"}],"version-history":[{"count":1,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/9769\/revisions"}],"predecessor-version":[{"id":9773,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/9769\/revisions\/9773"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9769"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=9769"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=9769"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}