{"id":312,"date":"2021-01-01T16:28:59","date_gmt":"2021-01-01T08:28:59","guid":{"rendered":"http:\/\/www.softeng.cn\/?p=312"},"modified":"2021-01-04T15:56:35","modified_gmt":"2021-01-04T07:56:35","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-%e7%bb%84%e4%bb%b6%e7%ae%a1%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.softeng.cn\/?p=312","title":{"rendered":"\u300aB\u7ad9-Spring\u6e90\u7801\u89e3\u6790\u300b\u5b66\u4e60\u7b14\u8bb0\uff08\u4e00\uff09\u2014\u2014\u7ec4\u4ef6\u7ba1\u7406"},"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. Spring\u4e2d\u6240\u6709\u7684\u7ec4\u4ef6\u90fd\u653e\u5728IOC\u5bb9\u5668\u4e2d\uff0c\u7ec4\u4ef6\u4e4b\u95f4\u7684\u5173\u7cfb\u901a\u8fc7\u5bb9\u5668\u8fdb\u884c\u81ea\u52a8\u88c5\u914d\uff08DI\uff09\u5373\u4f9d\u8d56\u6ce8\u5165\uff1b<\/li>\n
  2. \u4ee5\u524d\u662f\u901a\u8fc7xml\u65b9\u5f0f\u914d\u7f6ebean\u6807\u7b7e\u7684\u65b9\u5f0f\u6ce8\u518c\u5bf9\u8c61<\/li>\n<\/ol>\n
    <?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<beans xmlns=\"http:\/\/www.springframework.org\/schema\/beans\"\n       xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\n       xmlns:context=\"http:\/\/www.springframework.org\/schema\/context\"\n       xsi:schemaLocation=\"http:\/\/www.springframework.org\/schema\/beans http:\/\/www.springframework.org\/schema\/beans\/spring-beans.xsd http:\/\/www.springframework.org\/schema\/context https:\/\/www.springframework.org\/schema\/context\/spring-context.xsd\">\n\n    <bean id=\"person\" class=\"com.atguigu.bean.Person\">\n        <property name=\"age\" value=\"18\"><\/property>\n        <property name=\"name\" value=\"zhangsan\"><\/property>\n    <\/bean>\n<\/beans>\n<\/code><\/pre>\n
    \u5728\u4ee3\u7801\u4e2d\u901a\u8fc7new\u4e00\u4e2aClassPathXmlApplicationContext\u5bf9\u8c61\uff08\u8fd4\u56de\u7684\u662fApplicationContext\u7684IOC\u5bb9\u5668\uff09\u4f7f\u7528\u914d\u7f6e\u6587\u4ef6\u7684\u65b9\u5f0f\u6784\u9020Bean\uff0c\u6784\u9020\u51fd\u6570\u7684\u53c2\u6570\u662f\u914d\u7f6e\u6587\u4ef6\u7684\u8def\u5f84\uff08\u57fa\u4e8eresources\u76ee\u5f55\u7684\u76f8\u5bf9\u8def\u5f84\uff09<\/p>\n
    \/\/ \u4f7f\u7528\u914d\u7f6e\u6587\u4ef6\u7684\u65b9\u5f0f\u6784\u9020\u4e00\u4e2aBean\nApplicationContext applicationContext = new ClassPathXmlApplicationContext(\"beans.xml\");\n\/\/ \u7528id\u83b7\u53d6\nPerson bean = (Person) applicationContext.getBean(\"person\");\nSystem.out.println(bean);\n\n<\/code><\/pre>\n
    \u901a\u8fc7ApplicationContext\u7684getBean\u65b9\u6cd5\u4ee5Bean\u7684id\u4f5c\u4e3a\u53c2\u6570\uff0c\u83b7\u53d6\u5728\u5bb9\u5668\u4e2d\u6ce8\u518c\u7684Bean\u5bf9\u8c61
    \n3. \u73b0\u5728\u53ef\u4ee5\u901a\u8fc7\u914d\u7f6e\u7c7b\u7684\u65b9\u5f0f\u6ce8\u518c\u5bf9\u8c61\uff0c\u4f7f\u7528@Configuration\u6ce8\u89e3\u544a\u8bc9Spring\u67d0\u4e2a\u7c7b\u662f\u914d\u7f6e\u7c7b\uff0c\u4f5c\u7528\u4e0exml\u914d\u7f6e\u6587\u4ef6\u4e00\u6837
    \n4. \u5728\u914d\u7f6e\u7c7b\u4e2d\u901a\u8fc7\u7ed9function\u6dfb\u52a0@Bean\u6ce8\u89e3\uff08\u9002\u7528\u4e8e\u7ed9\u5bb9\u5668\u4e2d\u5bfc\u5165\u7b2c\u4e09\u65b9\u7ec4\u4ef6\u6216\u7c7b\uff09\uff0c\u5b9e\u73b0\u5411\u5bb9\u5668\u4e2d\u6ce8\u518cBean\uff0c\u5176\u4f5c\u7528\u4e0exml\u914d\u7f6e\u6587\u4ef6\u4e2d\u7684bean\u6807\u7b7e\u4e00\u6837<\/p>\n
    @Bean(value = \"person\") \/\/ \u901a\u8fc7value\u6307\u5b9aid\npublic Person person01() {\n    return new Person(\"lisi\", 20);\n}\n<\/code><\/pre>\n
    4.1. \u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u7c7b\u578b\u5373\u662f\u6ce8\u518cBean\u7684\u7c7b\u578b
    \n4.2. \u9ed8\u8ba4\u60c5\u51b5\u4e0b\u65b9\u6cd5\u540d\u662fBean\u7684id\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7@Bean\u6ce8\u89e3\u7684value\u53c2\u6570\u624b\u52a8\u8bbe\u7f6eBean\u7684id
    \n4.3. \u5728\u4ee3\u7801\u4e2d\u901a\u8fc7new\u4e00\u4e2aAnnotationConfigApplicationContext\u5bf9\u8c61\uff08\u8fd4\u56de\u7684\u662fApplicationContext\u7684IOC\u5bb9\u5668\uff09\u4f7f\u7528\u914d\u7f6e\u7c7b\u7684\u65b9\u5f0f\u6784\u5efaBean\uff0c\u6784\u9020\u51fd\u6570\u7684\u53c2\u6570\u662f\u914d\u7f6e\u7c7b\u7684\u7c7b\u578b<\/p>\n
    \/\/ \u4f7f\u7528\u914d\u7f6e\u7c7b\u7684\u65b9\u5f0f\u6784\u9020\u4e00\u4e2aBean\nApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfig.class);\n\/\/ \u7528\u7c7b\u578b\u83b7\u53d6\nPerson bean = applicationContext.getBean(Person.class);\n<\/code><\/pre>\n
    \u901a\u8fc7ApplicationContext\u7684getBean\u65b9\u6cd5\u4ee5Bean\u7684\u7c7b\u578b\u4f5c\u4e3a\u53c2\u6570\uff0c\u83b7\u53d6\u5728\u5bb9\u5668\u4e2d\u6ce8\u518c\u7684Bean\u5bf9\u8c61
    \n5. \u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u4f7f\u7528\u5305\u626b\u63cf\uff08\u9002\u7528\u4e8e\u81ea\u5df1\u5199\u7684\u7c7b\u5bfc\u5165\u5230\u5bb9\u5668\u4e2d\uff09\u7684\u60c5\u51b5\u6bd4\u8f83\u591a\uff0c\u5305\u626b\u63cf\u7684\u914d\u7f6e\u6709\u4e24\u79cd\uff0c\u5206\u522b\u662f\u914d\u7f6e\u6587\u4ef6\u914d\u7f6e\u548c\u6ce8\u89e3\u65b9\u5f0f\u914d\u7f6e
    \n5.1. \u82e5\u4f7f\u7528\u914d\u7f6e\u6587\u4ef6\u65b9\u5f0f\uff0c\u9700\u8981\u5728\u914d\u7f6e\u6587\u4ef6\u4e2d\u6dfb\u52a0context:component-scan\u6807\u7b7e<\/p>\n
    <context:component-scan base-package=\"com.atguigu\"><\/context:component-scan>\n<\/code><\/pre>\n
    \u5176\u4e2dbase-package\u7684\u503c\u6307\u5b9a\u4e86\u5305\u626b\u63cf\u7684\u8303\u56f4\uff0c\u610f\u601d\u662f\u626b\u63cf\u8be5\u5305\u4e0b\u7684\u6240\u6709\u7ec4\u4ef6\uff0c\u53ea\u8981\u6807\u6ce8\u4e86@Controller\u3001@Service\u3001@Repository\u3001@Component\u8fd9\u56db\u4e2a\u6ce8\u89e3\u4e2d\u4efb\u4f55\u4e00\u4e2a\u6ce8\u89e3\uff0c\u90fd\u4f1a\u88ab\u81ea\u52a8\u626b\u63cf\u52a0\u8fdb\u5bb9\u5668\u4e2d
    \n5.2. \u4f7f\u7528\u6ce8\u89e3\u65b9\u5f0f\u914d\u7f6e\u5305\u626b\u63cf\u65f6\uff0c\u9700\u8981\u7528\u5230@ComponentScan\u6ce8\u89e3\uff0c\u8be5\u6ce8\u89e3\u7684value\u53c2\u6570\u7528\u4e8e\u6307\u5b9a\u8981\u626b\u63cf\u7684\u5305\uff0c\u5176\u4f5c\u7528\u4e0e\u914d\u7f6e\u6587\u4ef6\u7684base-package\u503c\u4e00\u6837<\/p>\n
    @ComponentScan(value = \"com.atguigu\")\n<\/code><\/pre>\n
    5.3. \u901a\u8fc7getBeanDefinitionNames\u65b9\u6cd5\u53ef\u4ee5\u83b7\u53d6\u5230\u5bb9\u5668\u4e2d\u6240\u6709\u7684bean\u7684\u540d\u79f0<\/p>\n
    AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfig.class);\nString[] definitionNames = applicationContext.getBeanDefinitionNames();\nfor (String name : definitionNames) {\n    System.out.println(name);\n}\n<\/code><\/pre>\n
    5.4. \u53ef\u4ee5\u901a\u8fc7@ComponentScan\u6ce8\u89e3\u7684excludeFilter\u5c5e\u6027\u8bbe\u7f6e\u9700\u8981\u88ab\u6392\u9664\u7684\u7c7b\uff0c\u5176\u503c\u662f\u4e00\u4e2a@Filter\u6570\u7ec4
    \n5.5. @Filter\u6709\u4e24\u4e2a\u5e38\u7528\u5c5e\u6027\u5206\u522b\u662ftype\u548cclasses\uff0ctype\u7528\u4e8e\u6807\u6ce8\u8fc7\u6ee4\u89c4\u5219\uff0c\u603b\u5171\u6709\u4e94\u4e2a\uff0c\u5206\u522b\u662f\uff1a
    \n– ANNOTATION\uff08\u6309\u7167\u6ce8\u89e3\u8fdb\u884c\u8fc7\u6ee4\uff09
    \n– ASSIGNABLE_TYPE\uff08\u6309\u7167\u7ed9\u5b9a\u7684\u7c7b\u578b\u8fc7\u6ee4\uff0c\u5305\u542b\u5176\u5b50\u7c7b\u3001\u5b9e\u73b0\u7c7b\u7b49\uff09
    \n– ASPECTJ\uff08\u6309\u7167ASPECTJ\u8868\u8fbe\u5f0f\u8fc7\u6ee4\uff0c\u4e0d\u5e38\u7528\uff09
    \n– REGEX\uff08\u6309\u7167\u6b63\u5219\u8868\u8fbe\u5f0f\u8fc7\u6ee4\uff09
    \n– CUSTOM\uff08\u6309\u7167\u81ea\u5b9a\u4e49\u89c4\u5219\u89c4\u5f8b\uff0c\u81ea\u5b9a\u4e49\u89c4\u5219\u9700\u8981\u5b9e\u73b0TypeFilter\u63a5\u53e3\uff09
    \nclasses\u662f\u4e00\u4e2a\u7c7b\u578b\u6570\u7ec4<\/p>\n
    @ComponentScan(value = \"com.atguigu\", excludeFilters = {\n        @ComponentScan.Filter(type = FilterType.ANNOTATION, classes = {Controller.class}),\n})\n<\/code><\/pre>\n
    5.6. \u5f53\u914d\u7f6eincludeFilters\u89c4\u5219\u65f6\uff0c\u9700\u8981\u5148\u5c06@ComponentScan\u6ce8\u89e3\u7684useDefaultFilters\u53c2\u6570\u8bbe\u7f6e\u4e3afalse\uff0c\u5426\u5219\u9ed8\u8ba4\u7684\u5305\u626b\u63cf\u89c4\u5219\u5c31\u662f\u626b\u63cf\u6240\u6709\u7684\u6ce8\u89e3
    \n5.7. \u5982\u679c\u4f7f\u7528\u7684\u662fJDK 8\u53ca\u4ee5\u4e0a\u7248\u672c\uff0c@ComponentScan\u662f\u4e00\u4e2a\u91cd\u590d\u7ec4\u4ef6\uff0c\u53ef\u4ee5\u5728\u914d\u7f6e\u7c7b\u4e0a\u5b9a\u4e49\u591a\u4e2a@ComponentScan\u6ce8\u89e3\uff0c\u7528\u4ee5\u914d\u7f6e\u591a\u4e2a\u5305\u626b\u63cf\u89c4\u5219
    \n5.8. \u8003\u8651\u5230\u517c\u5bb9\u6027\u95ee\u9898\uff0c\u5982\u679c\u6709\u591a\u4e2a\u5305\u626b\u63cf\u89c4\u5219\uff0c\u5efa\u8bae\u4f7f\u7528@ComponentScans\u6ce8\u89e3\u5b9e\u73b0\u591a\u4e2a\u5305\u626b\u63cf\u7b56\u7565\uff0c@ComponentScans\u6ce8\u89e3\u53ea\u6709\u4e00\u4e2avalue\u53c2\u6570\uff0c\u5176\u503c\u662f@ComponentScan\u6570\u7ec4<\/p>\n
    \/\/ \u914d\u7f6e\u591a\u4e2a\u5305\u626b\u63cf\u89c4\u5219\n@ComponentScans(value = {\n        @ComponentScan(value = \"com.atguigu\", includeFilters = {\n                @ComponentScan.Filter(type = FilterType.ANNOTATION, classes = {Controller.class}),\n                @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, classes = {BookService.class}),\n                @ComponentScan.Filter(type = FilterType.CUSTOM, classes = {MyTypeFilter.class})\n        }, useDefaultFilters = false)   \/\/ \u914d\u7f6e\u5305\u626b\u63cf\u7684\u8303\u56f4\n})\n<\/code><\/pre>\n
    5.9. @Filter\u6ce8\u89e3\u4e2d\uff0c\u82e5type\u4e3aFilterType.CUSTOM\uff0c\u5219classes\u7684\u503c\u5fc5\u987b\u662f\u5b9e\u73b0\u4e86TypeFilter\u63a5\u53e3\u7684\u7c7b\uff0c\u5176\u4e2d\u6709\u4e00\u4e2amatch\u65b9\u6cd5\uff0c\u7528\u4e8e\u81ea\u5b9a\u4e49\u8fc7\u6ee4\u89c4\u5219\uff0c\u6307\u5b9a\u62a5\u540d\u4e0b\u7684\u6bcf\u4e00\u4e2a\u7c7b\uff0c\u90fd\u4f1a\u88ab\u626b\u63cf\u5230\u5e76\u7531match\u65b9\u6cd5\u8fdb\u884c\u5339\u914d\uff0cmatch\u65b9\u6cd5\u6709\u4e24\u4e2a\u53c2\u6570\u5206\u522b\u662fMetadataReader\u548cMetadataReaderFactory\uff0cmetadataReader\u7684\u503c\u662f\u201c\u5f53\u524d\u6b63\u5728\u626b\u63cf\u7684\u7c7b\u7684\u4fe1\u606f\u201d\uff0cmetadataReaderFactory\u7684\u503c\u662f\u201c\u5176\u4ed6\u4efb\u4f55\u7c7b\uff08\u4e0d\u6b62\u5f53\u524d\u7c7b\uff09\u7684\u4fe1\u606f\u201d\uff0c\u5176\u8fd4\u56de\u503c\u662fboolean\u578b\uff0c\u82e5\u5f53\u524d\u7c7b\u9700\u8981\u88ab\u8fc7\u6ee4\uff08\u5305\u542b\u6216\u6392\u9664\uff09\uff0c\u5219\u8fd4\u56detrue\uff0c\u53cd\u4e4b\u5219\u8fd4\u56defalse<\/p>\n
    public class MyTypeFilter implements TypeFilter {\n    \/***\n     * @param metadataReader \u8bfb\u53d6\u5230\u7684\u5f53\u524d\u6b63\u5728\u626b\u63cf\u7684\u7c7b\u7684\u4fe1\u606f\n     * @param metadataReaderFactory \u83b7\u53d6\u5230\u5176\u4ed6\u4efb\u4f55\u7c7b\uff08\u4e0d\u6b62\u5f53\u524d\u7c7b\uff09\u7684\u4fe1\u606f\n     * @return \u82e5\u8be5\u7c7b\u88ab\u8fc7\u6ee4\uff0c\u5219\u8fd4\u56detrue\uff0c\u53cd\u4e4b\u5219\u8fd4\u56defalse\n     **\/\n    @Override\n    public boolean match(MetadataReader metadataReader, MetadataReaderFactory metadataReaderFactory) throws IOException {\n        \/\/ \u83b7\u53d6\u5f53\u524d\u7c7b\u6ce8\u89e3\u7684\u4fe1\u606f\n        AnnotationMetadata annotationMetadata = metadataReader.getAnnotationMetadata();\n        \/\/ \u83b7\u53d6\u5f53\u524d\u6b63\u5728\u626b\u63cf\u7684\u7c7b\u7684\u7c7b\u4fe1\u606f\uff0c\u5982\u7c7b\u578b\u3001\u5b9e\u73b0\u4e86\u4ec0\u4e48\u63a5\u53e3\u7b49\n        ClassMetadata classMetadata = metadataReader.getClassMetadata();\n        \/\/ \u83b7\u53d6\u5f53\u524d\u7c7b\u8d44\u6e90\uff08\u7c7b\u7684\u8def\u5f84\u7b49\uff09\n        Resource resource = metadataReader.getResource();\n        \/\/ \u83b7\u53d6\u7c7b\u540d\uff08\u542b\u5305\u540d\uff09\n        String className = classMetadata.getClassName();\n        System.out.println(\"--->\" + className);\n        if (className.contains(\"er\")) {\n            return true;\n        }\n        return false;\n    }\n}\n<\/code><\/pre>\n
      \n
    1. \u5728IOC\u5bb9\u5668\u4e2d\uff0c\u9ed8\u8ba4Bean\u90fd\u662f\u5355\u5b9e\u4f8b\u7684\uff0c\u65e0\u8bba\u4ece\u5bb9\u5668\u4e2d\u83b7\u53d6\u5230\u5c11\u6b21\u76f8\u540c\u7c7b\u578b\u7684Bean\uff0c\u5176\u5b9e\u8fd4\u56de\u7684\u90fd\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7@Scope\u6ce8\u89e3\u6307\u5b9a\u6bcf\u4e2aBean\u7684\u4f5c\u7528\u8303\u56f4
      \n6.1. @Scope\u6ce8\u89e3\u7684value\u53d6\u503c\u8303\u56f4\u5305\u62ec4\u4e2a<\/li>\n<\/ol>\n
      – prototype\uff1a\u591a\u5b9e\u4f8b\uff0cIOC\u5bb9\u5668\u542f\u52a8\u65f6\u5e76\u4e0d\u4f1a\u53bb\u8c03\u7528\u65b9\u6cd5\u521b\u5efa\u5bf9\u8c61\u653e\u5728\u5bb9\u5668\u4e2d\uff0c\u800c\u662f\u6bcf\u6b21\u83b7\u53d6\u7684\u65f6\u5019\u90fd\u4f1a\u8c03\u7528\u65b9\u6cd5\u521b\u5efa\u5bf9\u8c61
      \n– singleton\uff1a\u5355\u5b9e\u4f8b\uff08\u9ed8\u8ba4\u503c\uff09\uff0cIOC\u5bb9\u5668\u542f\u52a8\u4f1a\u8c03\u7528\u65b9\u6cd5\u521b\u5efa\u5bf9\u8c61\u5230IOC\u5bb9\u5668\u4e2d\uff0c\u4ee5\u540e\u6bcf\u6b21\u83b7\u53d6\u5c31\u662f\u76f4\u63a5\u4ece\u5bb9\u5668\uff08map.get()\uff09\u4e2d\u62ff
      \n– request\uff1a\u540c\u4e00\u6b21\u8bf7\u6c42\u521b\u5efa\u4e00\u4e2a\u5b9e\u4f8b
      \n– session\uff1a\u540c\u4e00\u4e2asession\u521b\u5efa\u4e00\u4e2a\u5b9e\u4f8b<\/p>\n
      @Scope(\"prototype\")\n@Bean(\"person\")\npublic Person person() {\n    System.out.println(\"\u7ed9\u5bb9\u5668\u4e2d\u6dfb\u52a0Person...\");\n    return new Person(\"\u5f20\u4e09\", 25);\n}\n<\/code><\/pre>\n
      6.2. \u5f53Bean\u662f\u5355\u5b9e\u4f8b\u65f6\uff0c\u5728IOC\u5bb9\u5668\u521b\u5efa\u597d\u4e4b\u540e\uff0cBean\u5b9e\u4f8b\u9a6c\u4e0a\u5c31\u4f1a\u88ab\u521b\u5efa\uff0c\u4ee5\u540e\u6bcf\u6b21\u83b7\u53d6\uff0c\u90fd\u662f\u4ece\u5bb9\u5668\u4e2d\u53d6\u76f8\u540c\u7684Bean\u5b9e\u4f8b
      \n6.3. \u5f53Bean\u662f\u591a\u5b9e\u4f8b\u65f6\uff0c\u662f\u5728\u6bcf\u6b21\u83b7\u53d6\u5bf9\u8c61\u7684\u65f6\u5019\uff0cIOC\u5bb9\u5668\u624d\u4f1a\u521b\u5efaBean\u5b9e\u4f8b\u5e76\u8fd4\u56de
      \n7. \u5f53Bean\u662f\u5355\u5b9e\u4f8b\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7@Lazy\u6ce8\u89e3\u8bbe\u7f6e\u61d2\u52a0\u8f7d\uff0c\u5373\u9996\u6b21\u83b7\u53d6\u5bf9\u8c61\u65f6\uff0c\u518d\u521b\u5efaBean\u5b9e\u4f8b\uff0c\u800c\u4e0d\u662f\u5728IOC\u5bb9\u5668\u521b\u5efa\u597d\u4e4b\u540e\uff0c\u9a6c\u4e0a\u521b\u5efaBean\u5b9e\u4f8b<\/p>\n
      @Lazy\n@Bean(\"person\")\npublic Person person() {\n    System.out.println(\"\u7ed9\u5bb9\u5668\u4e2d\u6dfb\u52a0Person...\");\n    return new Person(\"\u5f20\u4e09\", 25);\n}\n<\/code><\/pre>\n
        \n
      1. Spring\u53ef\u4ee5\u6309\u7167\u6761\u4ef6\u7ed9\u5bb9\u5668\u4e2d\u6ce8\u518cBean\u5b9e\u4f8b\uff0c\u901a\u8fc7@Conditional\u6ce8\u89e3\u5b9e\u73b0\uff0c@Conditional\u6ce8\u89e3\u7684\u503c\u662f\u5b9e\u73b0Condition\u63a5\u53e3\u7684\u7c7b\u7684\u6570\u7ec4\uff0c\u8be5\u6ce8\u89e3\u53ef\u4ee5\u6807\u6ce8\u5728\u7c7b\u4e0a\uff0c\u4e5f\u53ef\u4ee5\u6807\u6ce8\u5728\u65b9\u6cd5\u4e0a
        \n8.1 Condition\u63a5\u53e3\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2amatches\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u6709\u4e24\u4e2a\u503cConditionContext\u8868\u793a\u201c\u80fd\u4f7f\u7528\u7684\u4e0a\u4e0b\u6587\uff08\u73af\u5883\u4fe1\u606f\uff09\u201d\uff0cAnnotatedTypeMetadata\u8868\u793a\u201c\u5f53\u524d\u6807\u6ce8\u4e86Condition\u6ce8\u89e3\u7684\u6ce8\u91ca\u4fe1\u606f\u201d<\/li>\n<\/ol>\n
        \/**\n * @author: wuhaohua\n * @date: Created in 2020\/12\/28 17:53\n * @description: \u5224\u65ad\u662f\u5426Linux\u64cd\u4f5c\u7cfb\u7edf\n *\/\npublic class LinuxCondition implements Condition {\n    \/***\n     * @param conditionContext \u5224\u65ad\u80fd\u4f7f\u7528\u7684\u4e0a\u4e0b\u6587\uff08\u73af\u5883\uff09\n     * @param annotatedTypeMetadata \u5f53\u524d\u6807\u6ce8\u4e86Condition\u6ce8\u89e3\u7684\u6ce8\u91ca\u4fe1\u606f\n     * @throws\n     * @Author: wuhaohua\n     * @Date: 2020\/12\/28\n     * @Description:\n     **\/\n    @Override\n    public boolean matches(ConditionContext conditionContext, AnnotatedTypeMetadata annotatedTypeMetadata) {\n        \/\/ 1\u3001\u80fd\u83b7\u53d6\u5230ioc\u4f7f\u7528\u7684beanfactory\n        ConfigurableListableBeanFactory beanFactory = conditionContext.getBeanFactory();\n        \/\/ 2\u3001\u83b7\u53d6\u7c7b\u52a0\u8f7d\u5668\n        ClassLoader classLoader = conditionContext.getClassLoader();\n        \/\/ 3\u3001\u83b7\u53d6\u5230\u73af\u5883\u4fe1\u606f\n        Environment environment = conditionContext.getEnvironment();\n        \/\/ 4\u3001\u83b7\u53d6\u5230bean\u5b9a\u4e49\u7684\u6ce8\u518c\u7c7b\n        BeanDefinitionRegistry registry = conditionContext.getRegistry();\n\n        String property = environment.getProperty(\"os.name\");\n        if (property.contains(\"Linux\")) {\n            return true;\n        }\n        return false;\n    }\n}\n<\/code><\/pre>\n
        \/**\n * @author: wuhaohua\n * @date: Created in 2020\/12\/28 17:54\n * @description: \u5224\u65ad\u662f\u5426Windows\u64cd\u4f5c\u7cfb\u7edf\n *\/\npublic class WindowsCondition implements Condition {\n    @Override\n    public boolean matches(ConditionContext conditionContext, AnnotatedTypeMetadata annotatedTypeMetadata) {\n        \/\/ 1\u3001\u80fd\u83b7\u53d6\u5230ioc\u4f7f\u7528\u7684beanfactory\n        ConfigurableListableBeanFactory beanFactory = conditionContext.getBeanFactory();\n        \/\/ 2\u3001\u83b7\u53d6\u7c7b\u52a0\u8f7d\u5668\n        ClassLoader classLoader = conditionContext.getClassLoader();\n        \/\/ 3\u3001\u83b7\u53d6\u5230\u73af\u5883\u4fe1\u606f\n        Environment environment = conditionContext.getEnvironment();\n        \/\/ 4\u3001\u83b7\u53d6\u5230bean\u5b9a\u4e49\u7684\u6ce8\u518c\u7c7b\n        BeanDefinitionRegistry registry = conditionContext.getRegistry();\n\n        String property = environment.getProperty(\"os.name\");\n\n        if (property.contains(\"Windows\")) {\n            return true;\n        }\n        return false;\n    }\n}\n<\/code><\/pre>\n
        8.2. \u5728\u5b9a\u4e49\u597dCondition\u7684\u5b9e\u73b0\u7c7b\u540e\uff0c\u5728\u9700\u8981\u63a7\u5236\u7684Bean\u6ce8\u518c\u65b9\u6cd5\u4e0a\u589e\u52a0\u76f8\u5e94\u7684\u6ce8\u89e3<\/p>\n
        \/***\n * @Conditional({Condition})\uff1a\u6309\u7167\u4e00\u5b9a\u7684\u6761\u4ef6\u8fdb\u884c\u5224\u65ad\uff0c\u6ee1\u8db3\u6761\u4ef6\u7ed9\u5bb9\u5668\u4e2d\u6ce8\u518cbean\n * \u5982\u679c\u7cfb\u7edf\u662fWindows\uff0c\u5c31\u7ed9\u5bb9\u5668\u4e2d\u6ce8\u518c(\"bill\")\n * \u5982\u679c\u7cfb\u7edf\u662fLinux\uff0c\u5c31\u7ed9\u5bb9\u5668\u4e2d\u6ce8\u518c(\"linus\")\n **\/\n@Conditional({WindowsCondition.class})\n@Bean(\"bill\")\npublic Person person01() {\n    return new Person(\"Bill Gates\", 62);\n}\n\n@Conditional({LinuxCondition.class})\n@Bean(\"linus\")\npublic Person person02() {\n    return new Person(\"Linus\", 48);\n}\n<\/code><\/pre>\n
        8.3. \u5f53@Conditional\u6ce8\u89e3\u6807\u6ce8\u5728\u7c7b\u4e0a\u65f6\uff0c\u6ee1\u8db3condition\u6761\u4ef6\uff0c\u8fd9\u4e2a\u7c7b\u4e2d\u914d\u7f6e\u7684\u6240\u6709bean\u6ce8\u518c\u624d\u4f1a\u751f\u6548
        \n9. \u4f7f\u7528@Import\u4e5f\u53ef\u4ee5\u5feb\u901f\u7684\u7ed9\u5bb9\u5668\u4e2d\u5bfc\u5165\u4e00\u4e2a\u7ec4\u4ef6\uff0c\u5c06\u5176\u6807\u6ce8\u5728\u914d\u7f6e\u7c7b\u4e0a\uff0c\u5176\u503c\u662f\u4e00\u4e2a\u7c7b\u578b\u6570\u7ec4\uff0c\u88ab\u8d4b\u503c\u7684\u7c7b\u4f1a\u81ea\u52a8\u6ce8\u518c\u5230IOC\u5bb9\u5668\u4e2d\uff0c\u6ce8\u518c\u7684Bean\u7684id\u9ed8\u8ba4\u662f\u7ec4\u4ef6\u7684\u5168\u7c7b\u540d\uff08\u5373\u542b\u5305\u540d\u7684\u7c7b\u540d\uff09<\/p>\n
        @Configuration\n\/\/ \u5bfc\u5165\u7ec4\u4ef6\uff0cid\u9ed8\u8ba4\u662f\u7ec4\u4ef6\u7684\u5168\u7c7b\u540d\uff08\u542b\u5305\u540d\uff09\n@Import({Color.class, Red.class, MyImportSelector.class, MyImportBeanDefinitionRegistrar.class})\npublic class MainConfig2 {\n    \/\/......\n}\n<\/code><\/pre>\n
        9.1. \u9664\u4e86\u76f4\u63a5\u5c06\u7c7b\u5199\u5728@Import\u6ce8\u89e3\u4e2d\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7\u5b9e\u73b0ImportSelector\u63a5\u53e3\u7684\u65b9\u5f0f\u5bfc\u5165\u5176\u4ed6\u7c7b\uff0c\u5b9e\u73b0ImportSelector\u63a5\u53e3\u4e2d\u7684selectImports\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u53ea\u6709\u4e00\u4e2a\u53c2\u6570AnnotationMetadata\uff0c\u5176\u503c\u662f\u5f53\u524d\u6807\u6ce8@Import\u6ce8\u89e3\u7684\u7c7b\uff08\u5373MainConfig2\u7c7b\uff09\u7684\u6240\u6709\u4fe1\u606f\uff0c\u8be5\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u662f\u8981\u5bfc\u5165\u5230\u5bb9\u5668\u4e2d\u7684\u7ec4\u4ef6\u5168\u7c7b\u540d\u6570\u7ec4<\/p>\n
        \/**\n * @author: wuhaohua\n * @date: Created in 2020\/12\/28 19:59\n * @description: \u81ea\u5b9a\u4e49\u903b\u8f91\u8fd4\u56de\u9700\u8981\u5bfc\u5165\u7684\u7ec4\u4ef6\n *\/\npublic class MyImportSelector implements ImportSelector {\n    \/***\n     * @param annotationMetadata \u5f53\u524d\u6807\u6ce8@Import\u6ce8\u89e3\u7684\u7c7b\u7684\u6240\u6709\u4fe1\u606f\n     * @return \u8981\u5bfc\u5165\u5230\u5bb9\u5668\u4e2d\u7684\u7ec4\u4ef6\u5168\u7c7b\u540d\n     * @throws\n     * @Author: wuhaohua\n     * @Date: 2020\/12\/28\n     * @Description:\n     **\/\n    @Override\n    public String[] selectImports(AnnotationMetadata annotationMetadata) {\n\n        \/\/\u65b9\u6cd5\u4e0d\u8981\u8fd4\u56denull\u503c\uff0c\u5426\u5219\u4f1a\u62a5\u7a7a\u6307\u9488\u5f02\u5e38\n        return new String[]{\"com.atguigu.bean.Blue\", \"com.atguigu.bean.Yellow\"};\n    }\n}\n<\/code><\/pre>\n
        9.2. \u9664\u4e86ImportSelector\u8fd8\u80fd\u901a\u8fc7\u5b9e\u73b0ImportBeanDefinitionRegistrar\u63a5\u53e3\u7684registerBeanDefinitions\u65b9\u6cd5\u53ef\u4ee5\u81ea\u5b9a\u4e49\u7ed9\u5bb9\u5668\u4e2d\u6ce8\u518cbean\uff08\u624b\u52a8\u6ce8\u518cbean\u5230\u5bb9\u5668\u4e2d\uff0c\u5728SpringBoot\u6e90\u7801\u4e2d\u7528\u7684\u6bd4\u8f83\u591a\uff09\uff0c\u8be5\u65b9\u6cd5\u6709\u4e24\u4e2a\u503c\uff0c\u5206\u522b\u662fAnnotationMetadata\uff08\u5f53\u524d\u7c7b\u7684\u6240\u6709\u6ce8\u89e3\u53ca\u5176\u4ed6\u4fe1\u606f\uff09\u548cBeanDefinitionRegistry\uff08bean\u5b9a\u4e49\u7684\u6ce8\u518c\u7c7b\uff0c\u6240\u6709bean\u7684\u5b9a\u4e49\u90fd\u5728\u8fd9\u6ce8\u518c\uff0c\u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e2a\u53d8\u91cf\u7ed9\u5bb9\u5668\u6ce8\u518c\u4e00\u4e2abean\uff09\uff0c\u4e3b\u8981\u901a\u8fc7\u64cd\u4f5cBeanDefinitionRegistry\u8fdb\u884c\u7ec4\u4ef6\u6dfb\u52a0\uff0c\u5e76\u4e14\u53ef\u4ee5\u6307\u5b9aBean\u7684\u540d\u5b57<\/p>\n
        public class MyImportBeanDefinitionRegistrar implements ImportBeanDefinitionRegistrar {\n    \/***\n     * @param importingClassMetadata \u5f53\u524d\u7c7b\u7684\u6240\u6709\u6ce8\u89e3\u53ca\u5176\u4ed6\u4fe1\u606f\n     * @param registry bean\u5b9a\u4e49\u7684\u6ce8\u518c\u7c7b\uff0c\u6240\u6709bean\u7684\u5b9a\u4e49\u90fd\u5728\u8fd9\u6ce8\u518c\uff0c\u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e2a\u53d8\u91cf\u7ed9\u5bb9\u5668\u6ce8\u518c\u4e00\u4e2abean\n     *                 \u628a\u6240\u6709\u9700\u8981\u6dfb\u52a0\u5230\u5bb9\u5668\u4e2d\u7684bean\uff1a\u8c03\u7528BeanDefinitionRegistry.registerBeanDefinition\u624b\u5de5\u6ce8\u518c\u8fdb\u6765\n     * @Author: wuhaohua\n     * @Date: 2020\/12\/29 \n     * @Description: \n     **\/\n    @Override\n    public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {\n        boolean red = registry.containsBeanDefinition(\"com.atguigu.bean.Red\");\n        boolean blue = registry.containsBeanDefinition(\"com.atguigu.bean.Blue\");\n        if (red && blue) {\n            \/\/ \u6307\u5b9aBean\u7684\u5b9a\u4e49\u4fe1\u606f\uff0c\u5373bean\u7684\u7c7b\u578b\u3001bean\u7684scope\u7b49\u7b49\n            RootBeanDefinition beanDefinition = new RootBeanDefinition(RainBow.class);\n            \/\/ \u6307\u5b9abean\u540d\n            registry.registerBeanDefinition(\"rainBow\", beanDefinition);\n        }\n    }\n}\n<\/code><\/pre>\n
          \n
        1. \u4f7f\u7528Sprig\u63d0\u4f9b\u7684FactoryBean\uff08\u5de5\u5382Bean\uff09\u4e5f\u53ef\u4ee5\u5411\u5bb9\u5668\u4e2d\u6ce8\u518cBean\uff0c\u533a\u522b\u4e8e\u666e\u901a\u7684Bean\uff0c\u5f53\u666e\u901a\u7684Bean\u6ce8\u518c\u5230\u5bb9\u5668\u65f6\uff0c\u5bb9\u5668\u4f1a\u8c03\u7528\u5176\u65e0\u53c2\u6784\u9020\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\u6ce8\u518c\u5728\u5bb9\u5668\u4e2d\uff0c\u800cFactoryBean\u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5bb9\u5668\u4f1a\u8c03\u7528\u5176getObject\u65b9\u6cd5\uff0c\u5c06\u5176\u8fd4\u56de\u7684\u5bf9\u8c61\u6ce8\u518c\u5230\u5bb9\u5668\u4e2d\uff08\u4e5f\u4f1a\u8c03\u7528\u5176getObjectType\u548cisSingleton\u65b9\u6cd5\uff09
          \n10.1.  \u82e5\u8981\u4f7f\u7528FactoryBean\uff0c\u9700\u8981\u81ea\u5b9a\u4e49\u7c7b\u5e76\u5b9e\u73b0FactoryBean\u63a5\u53e3\uff0c\u63a5\u53e3\u4e0a\u7684\u6cdb\u578b\u4ee3\u8868\u7740\u9700\u8981\u6ce8\u518c\u5230\u5bb9\u5668\u7684\u7c7b<\/li>\n<\/ol>\n
          \/**\n * @author: wuhaohua\n * @date: Created in 2020\/12\/29 15:31\n * @description: \u521b\u5efa\u4e00\u4e2aSpring\u5b9a\u4e49\u7684FactoryBean\n *\/\npublic class ColorFactoryBean implements FactoryBean<Color> {\n    \/***\n     * @return \u9700\u8981\u6dfb\u52a0\u5230\u5bb9\u5668\u4e2d\u7684Color\u5bf9\u8c61\n     * @Author: wuhaohua\n     * @Date: 2020\/12\/29 \n     * @Description: \u8fd4\u56de\u4e00\u4e2aColor\u5bf9\u5e94\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u4f1a\u88ab\u6dfb\u52a0\u5230\u5bb9\u5668\u4e2d\n     **\/\n    @Override\n    public Color getObject() throws Exception {\n        System.out.println(\"ColorFactoryBean getObject...\");\n        return new Color();\n    }\n\n    \/***\n     * @return Bean\u7684\u7c7b\u578b\n     * @Author: wuhaohua\n     * @Date: 2020\/12\/29\n     * @Description: Bean\u7684\u7c7b\u578b\n     **\/\n    @Override\n    public Class<?> getObjectType() {\n        return Color.class;\n    }\n\n    \/***\n     * @return \u82e5\u8fd4\u56detrue\uff0c\u8fd9\u4e2abean\u662f\u5355\u4f8b\u7684\uff0c\u5728\u5bb9\u5668\u4e2d\u53ea\u4fdd\u5b58\u4e00\u4efd\uff0c\u82e5\u8fd4\u56defalse\uff0c\u6bcf\u6b21\u83b7\u53d6\u65f6\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684bean\n     * @Author: wuhaohua\n     * @Date: 2020\/12\/29\n     * @Description: \u63a7\u5236\u8be5bean\u662f\u5426\u662f\u5355\u5b9e\u4f8b\n     **\/\n    @Override\n    public boolean isSingleton() {\n        return false;\n    }\n}\n<\/code><\/pre>\n
          \u7136\u540e\u9700\u8981\u5728\u914d\u7f6e\u7c7b\u4e2d\u5c06\u81ea\u5b9a\u4e49\u7684FactoryBean\u5b9e\u73b0\u7c7b\u4f5c\u4e3aBean\u5bf9\u8c61\u6dfb\u52a0\u5230\u5bb9\u5668\u4e2d<\/p>\n
          @Bean\npublic ColorFactoryBean colorFactoryBean() {\n    return new ColorFactoryBean();\n}\n<\/code><\/pre>\n
          10.2. \u8fd9\u91cc\u9700\u8981\u6ce8\u610f\uff0c\u867d\u7136\u4ece\u4ee3\u7801\u5c42\u9762\u770b\u8d77\u6765\u88c5\u914d\u7684\u662fColorFactoryBean\uff0c\u4f46\u5b9e\u9645\u4e0a\u88c5\u914d\u7684\u662fColorFactoryBean\u7684getObject\u65b9\u6cd5\u521b\u5efa\u7684Color\u5bf9\u8c61\uff0c\u82e5\u60f3\u83b7\u53d6\u5230ColorFactoryBean\u672c\u8eab\u7684\u8bdd\uff0c\u9700\u8981\u5728\u83b7\u53d6\u7684beanId\u524d\u9762\u589e\u52a0\u4e00\u4e2a&\u524d\u7f00<\/p>\n
          @Test\npublic void testImport() {\n    printBeans(applicationContext);\n    Blue bean = applicationContext.getBean(Blue.class);\n    System.out.println(bean);\n\n    \/\/ \u5de5\u5382Bean\u83b7\u53d6\u7684\u662f\u8c03\u7528getObject\u521b\u5efa\u7684\u5bf9\u8c61\n    Object colorFactoryBean = applicationContext.getBean(\"colorFactoryBean\");\n    System.out.println(\"bean\u7684\u7c7b\u578b\" + colorFactoryBean.getClass());\n\n    Object colorFactoryBean3 = applicationContext.getBean(\"&colorFactoryBean\");\n    System.out.println(\"bean\u7684\u7c7b\u578b\" + colorFactoryBean3.getClass());\n}\n<\/code><\/pre>\n  \n  \n  ","protected":false},"excerpt":{"rendered":"
          \u89c6\u9891\u5730\u5740\uff1ahttps:\/\/www.bilibili.com\/video\/BV1oW41167AV \u5bf9\u5e94\u4ee3\u7801Gi…Continue reading \u300aB\u7ad9-Spring\u6e90\u7801\u89e3\u6790\u300b\u5b66\u4e60\u7b14\u8bb0\uff08\u4e00\uff09\u2014\u2014\u7ec4\u4ef6\u7ba1\u7406<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[35,36,37],"class_list":["post-312","post","type-post","status-publish","format-standard","hentry","category-32","tag-spring","tag-36","tag-37"],"_links":{"self":[{"href":"https:\/\/www.softeng.cn\/index.php?rest_route=\/wp\/v2\/posts\/312"}],"collection":[{"href":"https:\/\/www.softeng.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.softeng.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.softeng.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.softeng.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=312"}],"version-history":[{"count":4,"href":"https:\/\/www.softeng.cn\/index.php?rest_route=\/wp\/v2\/posts\/312\/revisions"}],"predecessor-version":[{"id":316,"href":"https:\/\/www.softeng.cn\/index.php?rest_route=\/wp\/v2\/posts\/312\/revisions\/316"}],"wp:attachment":[{"href":"https:\/\/www.softeng.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=312"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.softeng.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=312"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.softeng.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=312"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}