{"id":319,"date":"2021-01-04T16:18:17","date_gmt":"2021-01-04T08:18:17","guid":{"rendered":"http:\/\/www.softeng.cn\/?p=319"},"modified":"2021-01-04T16:18:17","modified_gmt":"2021-01-04T08:18:17","slug":"%e3%80%8ab%e7%ab%99-spring%e6%ba%90%e7%a0%81%e8%a7%a3%e6%9e%90%e3%80%8b%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0%ef%bc%88%e4%ba%8c%ef%bc%89-bean%e7%9a%84%e7%94%9f%e5%91%bd%e5%91%a8","status":"publish","type":"post","link":"https:\/\/www.softeng.cn\/?p=319","title":{"rendered":"\u300aB\u7ad9-Spring\u6e90\u7801\u89e3\u6790\u300b\u5b66\u4e60\u7b14\u8bb0\uff08\u4e8c\uff09\u2014\u2014Bean\u7684\u751f\u547d\u5468\u671f"},"content":{"rendered":"

\u89c6\u9891\u5730\u5740\uff1ahttps:\/\/www.bilibili.com\/video\/BV1oW41167AV<\/a>
\n\u5bf9\u5e94\u4ee3\u7801Git\u5e93\u5730\u5740\uff1ahttps:\/\/github.com\/whh306318848\/spring-annotation.git<\/a><\/p>\n

    \n
  1. Bean\u7684\u751f\u547d\u5468\u671f\u662f\u6307Bean\u7684\u521b\u5efa–\u521d\u59cb\u5316–\u9500\u6bc1\u7684\u8fc7\u7a0b\uff0cBean\u7684\u751f\u547d\u5468\u671f\u662f\u7531\u5bb9\u5668\u6765\u7ba1\u7406\u7684<\/li>\n
  2. \u5173\u4e8e\u6784\u9020\uff08\u5bf9\u8c61\u521b\u5efa\uff09\uff0c\u5355\u5b9e\u4f8bBean\u662f\u5728\u5bb9\u5668\u542f\u52a8\u7684\u65f6\u5019\u8fdb\u884c\u521b\u5efa\u7684\uff0c\u800c\u591a\u5b9e\u4f8bBean\u662f\u5728\u6bcf\u6b21\u83b7\u53d6\u7684\u65f6\u5019\u624d\u8fdb\u884c\u521b\u5efa\u7684<\/li>\n
  3. \u5173\u4e8e\u521d\u59cb\u5316\uff0c\u521d\u59cb\u5316\u4ee3\u7801\u662f\u5728\u5bf9\u8c61\u521b\u5efa\u5b8c\u6210\u5e76\u8d4b\u503c\u4e4b\u540e\u8fdb\u884c\u8c03\u7528\u7684<\/li>\n
  4. \u5173\u4e8e\u9500\u6bc1\uff0c\u5355\u5b9e\u4f8bBean\u662f\u5728\u5bb9\u5668\u5173\u95ed\u7684\u65f6\u5019\uff08\u5373\u5bb9\u5668\u7684close\u65b9\u6cd5\u88ab\u8c03\u7528\u65f6\uff09\u8fdb\u884c\u9500\u6bc1\u7684\uff0c\u800c\u591a\u5b9e\u4f8bBean\u7684\u9500\u6bc1\u5de5\u4f5c\u5bb9\u5668\u4e0d\u4f1a\u8fdb\u884c\u7ba1\u7406<\/li>\n
  5. \u6211\u4eec\u53ef\u4ee5\u81ea\u5b9a\u4e49Bean\u7684\u521d\u59cb\u5316\u548c\u9500\u6bc1\u65b9\u6cd5\uff0c\u5bb9\u5668\u4f1a\u5728Bean\u8fdb\u884c\u5230\u5f53\u524d\u751f\u547d\u5468\u671f\u7684\u65f6\u5019\u6765\u8c03\u7528\u6211\u4eec\u81ea\u5b9a\u4e49\u7684\u521d\u59cb\u5316\u548c\u9500\u6bc1\u65b9\u6cd5<\/li>\n
  6. \u81ea\u5b9a\u4e49Bean\u7684\u521d\u59cb\u5316\u548c\u9500\u6bc1\u5171\u6709\u56db\u79cd\u65b9\u6cd5\uff0c\u5206\u522b\u662f<\/li>\n<\/ol>\n

    – \u6307\u5b9a\u521d\u59cb\u5316\u548c\u9500\u6bc1\u65b9\u6cd5
    \n– \u8ba9Bean\u5b9e\u73b0InitializingBean\u3001DisposableBean\u63a5\u53e3\u5b9a\u4e49
    \n– \u4f7f\u7528@PostConstruct\u6ce8\u89e3\u548c@PreDestroy\u6ce8\u89e3
    \n– \u81ea\u5b9a\u4e49\u7c7b\u5b9e\u73b0BeanPostProcessor\u63a5\u53e3
    \n7. \u7b2c\u4e00\u79cd\uff0c\u6307\u5b9a\u521d\u59cb\u5316\u548c\u9500\u6bc1\u65b9\u6cd5\u6709\u4e24\u79cd\u65b9\u5f0f\u5b9e\u73b0
    \n7.1. \u5728bean\u7684xml\u914d\u7f6e\u6587\u4ef6\u4e2d\uff0c\u53ef\u4ee5\u4e3abean\u6807\u7b7e\u6dfb\u52a0init-method\u548cdestory-method\u5c5e\u6027\u6307\u5b9a\u521d\u59cb\u5316\u548c\u9500\u6bc1\u65b9\u6cd5\uff0c\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u5fc5\u987b\u6ca1\u6709\u53c2\u6570\uff0c\u4f46\u662f\u53ef\u4ee5\u629b\u51fa\u5f02\u5e38\uff0c\u4ee5\u4e0a\u4e24\u4e2a\u65b9\u6cd5\u5fc5\u987b\u5b9a\u4e49\u5728\u5f53\u524d\u5bf9\u8c61\u7684\u7c7b\u91cc
    \n7.2. \u9664\u4e86xml\u914d\u7f6e\u6587\u4ef6\u5916\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u6ce8\u89e3\u7684\u65b9\u5f0f\u8bbe\u7f6eBean\u7684\u521d\u59cb\u5316\u548c\u9500\u6bc1\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5728@Bean\u6ce8\u89e3\u4e2d\u8bbe\u7f6einitMethod\u548cdestroyMethod\uff0c\u5176\u503c\u5c31\u662f\u5bf9\u5e94\u65b9\u6cd5\u7684\u65b9\u6cd5\u540d\uff0c\u4ee5\u4e0a\u4e24\u4e2a\u65b9\u6cd5\u5fc5\u987b\u5b9a\u4e49\u5728\u5f53\u524d\u5bf9\u8c61\u7684\u7c7b\u91cc<\/p>\n

    public class Car {\n    public Car() {\n        System.out.println(\"car constructor...\");\n    }\n\n    public void init() {\n        System.out.println(\"car init...\");\n    }\n\n    public void destory() {\n        System.out.println(\"car destory...\");\n    }\n}\n\n<\/code><\/pre>\n
    @Bean(initMethod = \"init\", destroyMethod = \"destory\")\npublic Car car() {\n    return new Car();\n}\n<\/code><\/pre>\n
      \n
    1. \u7b2c\u4e8c\u79cd\uff0c\u53ef\u4ee5\u901a\u8fc7\u8ba9Bean\u5b9e\u73b0InitializingBean\u63a5\u53e3\u7684afterPropertiesSet\u65b9\u6cd5\u548cDisposableBean\u63a5\u53e3\u7684destroy\u65b9\u6cd5\u5b9e\u73b0\u81ea\u5b9a\u4e49\u521d\u59cb\u5316\u548c\u9500\u6bc1<\/li>\n<\/ol>\n
      @Component\npublic class Cat implements InitializingBean, DisposableBean {\n\n    public Cat() {\n        System.out.println(\"cat constructor...\");\n    }\n\n    \/***\n     * @Author: wuhaohua\n     * @Date: 2020\/12\/29\n     * @Description: \u5728Bean\u9500\u6bc1\u4e4b\u524d\u88ab\u8c03\u7528\n     **\/\n    @Override\n    public void destroy() throws Exception {\n        System.out.println(\"cat destroy...\");\n\n    }\n\n    \/***\n     * @Author: wuhaohua\n     * @Date: 2020\/12\/29\n     * @Description: \u5728Bean\u6784\u5efa\u4e4b\u540e\uff0c\u521d\u59cb\u5316\u4e4b\u524d\u88ab\u8c03\u7528\n     **\/\n    @Override\n    public void afterPropertiesSet() throws Exception {\n        System.out.println(\"cat afterPropertiesSet...\");\n    }\n}\n\n<\/code><\/pre>\n
        \n
      1. \u7b2c\u4e09\u79cd\uff0c\u53ef\u4ee5\u4f7f\u7528JSR250\u89c4\u8303\u4e2d\u5b9a\u4e49\u7684\u4e24\u4e2a\u6ce8\u89e3\uff1a@PostConstruct\u548c@PreDestroy
        \n9.1. @PostConstruct\uff1a\u5728Bean\u88c5\u914d\u5b8c\u6210\u540e\uff0c\u5373\u5bf9\u8c61\u521b\u5efa\uff0c\u5c5e\u6027\u8d4b\u503c\u5b8c\u6210\u540e\uff0c\u6267\u884c\u521d\u59cb\u5316\uff0c\u662f\u4e00\u4e2a\u6807\u6ce8\u5728\u65b9\u6cd5\u4e0a\u7684\u6ce8\u89e3
        \n9.2. @PreDestroy\uff1a\u5728\u5bb9\u5668\u9500\u6bc1bean\u4e4b\u524d\uff0c\u901a\u77e5\u6211\u4eec\u8fdb\u884c\u6e05\u7406\u5de5\u4f5c<\/li>\n<\/ol>\n
        @Component\npublic class Dog {\n\n    private ApplicationContext applicationContext;\n\n    public Dog() {\n        System.out.println(\"dog constructor...\");\n    }\n\n    \/***\n     * @Author: wuhaohua\n     * @Date: 2020\/12\/29\n     * @Description: \u5bf9\u8c61\u521b\u5efa\u5e76\u8d4b\u503c\u4e4b\u540e\u8c03\u7528\n     **\/\n    @PostConstruct\n    public void init() {\n        System.out.println(\"dog PostConstruct...\");\n    }\n\n    \/***\n     * @Author: wuhaohua\n     * @Date: 2020\/12\/29\n     * @Description: \u5bb9\u5668\u79fb\u9664\u5bf9\u8c61\u4e4b\u524d\u8c03\u7528\n     **\/\n    @PreDestroy\n    public void destory() {\n        System.out.println(\"dog PreDestroy...\");\n    }\n}\n<\/code><\/pre>\n
          \n
        1. \u7b2c\u56db\u79cd\uff0c\u5b9e\u73b0BeanPostProcessor\u63a5\u53e3\uff0c\u5373bean\u7684\u540e\u7f6e\u5904\u7406\u5668\uff0c\u662f\u5728bean\u521d\u59cb\u5316\u524d\u540e\u8fdb\u884c\u4e00\u4e9b\u5904\u7406\u5de5\u4f5c\uff0c\u8be5\u63a5\u53e3\u5b9a\u4e49\u4e86\u4e24\u4e2a\u65b9\u6cd5\uff0c\u5206\u522b\u662fpostProcessBeforeInitialization\uff08\u5728\u5df2\u7ecf\u521b\u5efaBean\u5b9e\u4f8b\u4e4b\u540e\uff0c\u5728\u4efb\u4f55\u521d\u59cb\u5316\u65b9\u6cd5\u8c03\u7528\u4e4b\u524d\u88ab\u8c03\u7528\uff09\u548cpostProcessAfterInitialization\uff08\u5728Bean\u5b9e\u4f8b\u7684\u521d\u59cb\u5316\u4e4b\u540e\u88ab\u8c03\u7528\uff09
          \n10.1. postProcessBeforeInitialization\u65b9\u6cd5\u6709\u4e24\u4e2a\u53c2\u6570\uff0c\u5206\u522b\u662fbean\uff08\u521a\u521b\u5efa\u7684\u5b9e\u4f8b\uff09\u548cbeanName\uff08\u8be5\u5b9e\u4f8b\u5728\u5bb9\u5668\u4e2d\u7684\u540d\u5b57\uff09\uff0c\u5176\u8fd4\u56de\u503c\u662f\u540e\u9762\u8981\u7528\u7684bean\u5b9e\u4f8b\uff0c\u5373\u53ef\u8fd4\u56de\u539f\u6765\u7684\u5bf9\u8c61\uff0c\u4e5f\u53ef\u4ee5\u8fd4\u56de\u5305\u88c5\u540e\u7684\u5bf9\u8c61
          \n10.2. postProcessAfterInitialization\u65b9\u6cd5\u6709\u4e24\u4e2a\u53c2\u6570\uff0c\u5206\u522b\u662fbean\uff08\u521a\u521b\u5efa\u7684\u5b9e\u4f8b\uff09\u548cbeanName\uff08\u8be5\u5b9e\u4f8b\u5728\u5bb9\u5668\u4e2d\u7684\u540d\u5b57\uff09\uff0c\u5373\u53ef\u8fd4\u56de\u539f\u6765\u7684\u5bf9\u8c61\uff0c\u4e5f\u53ef\u4ee5\u8fd4\u56de\u5305\u88c5\u540e\u7684\u5bf9\u8c61<\/li>\n<\/ol>\n
          \/**\n * @author: wuhaohua\n * @date: Created in 2020\/12\/29 18:02\n * @description: \u540e\u7f6e\u5904\u7406\u5668\uff1a\u521d\u59cb\u5316\u524d\u540e\u8fdb\u884c\u5904\u7406\u5de5\u4f5c\n *\/\n@Component\npublic class MyBeanPostProcessor implements BeanPostProcessor {\n\n    \/***\n     * @param bean \u521a\u521b\u5efa\u7684\u5b9e\u4f8b\n     * @param beanName \u8fd9\u4e2a\u5b9e\u4f8b\u5728\u5bb9\u5668\u4e2d\u7684\u540d\u5b57\n     * @return \u5c06\u8981\u4f7f\u7528\u7684bean\u5b9e\u4f8b\n     * @Author: wuhaohua\n     * @Date: 2020\/12\/29 \n     * @Description:\n     **\/\n    @Override\n    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {\n        System.out.println(\"postProcessBeforeInitialization...\" + beanName + \"=>\" + bean);\n        return bean;\n    }\n\n    \/***\n     * @param bean \u521a\u521b\u5efa\u7684\u5b9e\u4f8b\n     * @param beanName \u8fd9\u4e2a\u5b9e\u4f8b\u5728\u5bb9\u5668\u4e2d\u7684\u540d\u5b57\n     * @return \u5c06\u8981\u4f7f\u7528\u7684bean\u5b9e\u4f8b\n     * @Author: wuhaohua\n     * @Date: 2020\/12\/29\n     * @Description:\n     **\/\n    @Override\n    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {\n        System.out.println(\"postProcessAfterInitialization...\" + beanName + \"=>\" + bean);\n        return bean;\n    }\n}\n<\/code><\/pre>\n
          10.3. BeanPostProcessor\u7684\u5de5\u4f5c\u539f\u7406\uff1a<\/p>\n
          \/\/ \u7ed9bean\u8fdb\u884c\u5c5e\u6027\u8d4b\u503c\npopulateBean(beanName, mbd, instanceWrapper);\ninitializeBean {\n    \/\/ \u627e\u5230\u6240\u6709\u7684BeanPostProcessor\uff0c\u904d\u5386\uff0c\u7136\u540e\u6267\u884c\u5176postProcessBeforeInitialization\u65b9\u6cd5\uff0c\u4e00\u65e6\u67d0\u4e2apostProcessBeforeInitialization\u8fd4\u56denull\u4ee5\u540e\uff0c\u540e\u9762\u7684BeanPostProcessor\u5c31\u4e0d\u4f1a\u88ab\u6267\u884c\u4e86\uff0c\u6574\u4e2a\u65b9\u6cd5\u5c31\u76f4\u63a5\u8fd4\u56de\u4e86\n    applyBeanPostProcessorsBeforeInitialization(wrappedBean, beanName);\n    \/\/ \u6267\u884c\u81ea\u5b9a\u4e49\u521d\u59cb\u5316\u51fd\u6570\n    invokeInitMethods(beanName, wrappenBean, mbd);\n    \/\/ \n    applyBeanPostProcessAfterInitialization(wrappedBean, beanName);\n}\n<\/code><\/pre>\n
            \n
          1. \u5404\u4e2a\u65b9\u6cd5\u5728Bean\u5b9e\u4f8b\u5316\u548c\u9500\u6bc1\u8fc7\u7a0b\u4e2d\u7684\u8c03\u7528\u987a\u5e8f\u6574\u7406
            \n11.1. Bean\u5b9e\u4f8b\u5316\u8fc7\u7a0b\uff1a
            \nBean\u7684\u6784\u9020\u51fd\u6570 > BeanPostProcessor\u7684postProcessBeforeInitialization() > @PostConstruct\u6ce8\u89e3\u6807\u6ce8\u7684\u65b9\u6cd5 > InitializingBean\u7684afterPropertiesSet() > Bean\u7684initMethod() > BeanPostProcessor\u7684postProcessAfterInitialization()
            \n11.2. Bean\u9500\u6bc1\u8fc7\u7a0b\uff1a
            \n@PreDestroy\u6ce8\u89e3\u6807\u6ce8\u7684\u65b9\u6cd5 > DisposableBean\u7684destroy() > Bean\u7684destroyMethod()<\/p>\n<\/li>\n
          2. \n
            BeanPostProcessor\u5728Spring\u5e95\u5c42\u7684\u4f7f\u7528
            \n12.1. BeanPostProcessor\u6709\u975e\u5e38\u591a\u7684\u5b9e\u73b0\u7c7b\uff0c\u5f88\u591a\u6ce8\u89e3\u90fd\u5b9e\u73b0\u4e86\u8be5\u63a5\u53e3
            \n12.2. \u5982\u679c\u7ec4\u4ef6\u4e2d\u9700\u8981\u4f7f\u7528IOC\u5bb9\u5668\uff0c\u53ef\u4ee5\u8ba9\u7ec4\u4ef6\u5b9e\u73b0ApplicationContextAware\u63a5\u53e3\uff0c\u8be5\u63a5\u53e3\u6709\u4e00\u4e2asetApplicationContext\u65b9\u6cd5\uff0c\u5176\u53c2\u6570ApplicationContext\u5373\u662fIOC\u5bb9\u5668\uff0c\u5c06\u8be5\u65b9\u6cd5\u4f20\u5165\u7684IOC\u5bb9\u5668\u4fdd\u5b58\u8d77\u6765\uff0c\u5219\u8be5\u7c7b\u7684\u5176\u4ed6\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e2a\u5bb9\u5668
            \n12.3. setApplicationContext\u65b9\u6cd5\u662f\u5728\u5f53\u524d\u7ec4\u4ef6\u88ab\u521b\u5efa\u4e4b\u540e\u9a6c\u4e0a\u8c03\u7528\uff0c\u5373\u6784\u9020\u51fd\u6570\u8c03\u7528\u4e4b\u540e\u9a6c\u4e0a\u8c03\u7528\u7684<\/p>\n<\/li>\n<\/ol>\n
            @Component\npublic class Dog implements ApplicationContextAware {\n\n    private ApplicationContext applicationContext;\n\n    public Dog() {\n        System.out.println(\"dog constructor...\");\n    }\n\n    @Override\n    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {\n        this.applicationContext = applicationContext;\n    }\n}\n<\/code><\/pre>\n
            12.4. \u82e5\u9700\u8981\u5728Bean\u521b\u5efa\u6210\u529f\u4e4b\u540e\u8fdb\u884c\u6570\u636e\u6821\u9a8c\uff0c\u53ef\u4ee5\u901a\u8fc7BeanValidationPostProcessor\u5b9e\u73b0
            \n12.5. Spring\u5e95\u5c42\u7684bean\u8d4b\u503c\u3001\u5176\u4ed6\u7ec4\u4ef6\u6ce8\u5165\u3001@Autowired\u3001\u751f\u547d\u5468\u671f\u6ce8\u89e3\u529f\u80fd\u3001@Async\u6ce8\u89e3\u7b49\u529f\u80fd\uff0c\u90fd\u662f\u7528BeanPostProcessor\u5b9e\u73b0\u7684<\/p>\n  \n  \n  ","protected":false},"excerpt":{"rendered":"
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