{"id":4016,"date":"2019-03-20T16:09:27","date_gmt":"2019-03-20T08:09:27","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=4016"},"modified":"2019-03-20T16:09:27","modified_gmt":"2019-03-20T08:09:27","slug":"%e7%9c%8b%e6%ba%90%e7%a0%81%ef%bc%8c%e6%88%91%e4%b8%ba%e4%bb%80%e4%b9%88%e5%bb%ba%e8%ae%ae%e4%bd%a0%e5%85%88%e4%bb%8e-springboot-%e5%bc%80%e5%a7%8b","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=4016","title":{"rendered":"\u770b\u6e90\u7801\uff0c\u6211\u4e3a\u4ec0\u4e48\u5efa\u8bae\u4f60\u5148\u4ece SpringBoot \u5f00\u59cb"},"content":{"rendered":"

\n\t\u5728\u9762\u8bd5\u8fc7\u7a0b\u4e2d\uff0c\u5f88\u591a\u9762\u8bd5\u5b98\u90fd\u4f1a\u6216\u591a\u6216\u5c11\u7684\u95ee\u4f60\uff0c\u6709\u6ca1\u6709\u770b\u8fc7\u6e90\u7801\uff1f\n<\/p>\n

\n\t\u5982\u679c\u4f60\u56de\u7b54\uff0c\u6ca1\u6709\uff01\u90a3\u5c31\u6362\u5176\u4ed6\u95ee\u9898\u3002\u4f46\u662f\u5982\u679c\u4f60\u5de5\u4f5c\u65f6\u95f4\u6bd4\u8f83\u957f\u4e86\uff0c\u6bd4\u5982 3 \u5e74\u4e86\u3002\u4f46\u4f60\u8fd8\u6ca1\u6709\u770b\u8fc7\u4e00\u4e9b\u6846\u67b6\u7684\u6e90\u7801\uff0c\u90a3\u4e48\u5f88\u53ef\u80fd\u4f60\u5c31\u88ab pass \u6389\u4e86\u3002\n<\/p>\n

\n\t\u9762\u5bf9\u8fd9\u79cd\u60c5\u51b5\uff0c\u4f60\u8be5\u600e\u4e48\u529e\uff1f\n<\/p>\n

\n\t\u5fc5\u987b\u7684\u5148\u770b\u51e0\u5957\u554a\u3002\u552c\u4f4f\u4e86\u5c31 50K\uff0c\u552c\u4e0d\u4f4f\u5c31\u53ea\u80fd 5K \u4e86\u3002\n<\/p>\n

\n\t\u90a3\u4e48\u770b\u51e0\u5957\uff0c\u884c\u554a\uff0c\u6211\u4e5f\u770b\u4e86\uff0c\u4f46\u662f\u770b\u4e0d\u61c2\u554a\uff0c\u65e0\u5b58\u4e0b\u624b\u3002\u54ce\uff0c\u90a3\u4e48\u8fd9\u4e2a\u65f6\u5019\uff0c\u6211\u63a8\u8350\u4f60\u5148\u4ece SpringBoot \u7684\u6e90\u7801\u5f00\u59cb\u770b\u8d77\u3002\u4e3a\u4ec0\u4e48\u5462\uff1f\u539f\u56e0\u6709\u4ee5\u4e0b 3 \u70b9\uff1a\n<\/p>\n

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  1. \n

    \n\t\t\t\u70ed\u95e8\u3002SpringBoot \u6709\u591a\u70ed\u95e8\uff0c\u6211\u76f8\u4fe1\u5927\u5bb6\u6bd4\u6211\u90fd\u6e05\u695a\u5427\u3002\u4f60\u548c\u5979\u76f8\u5904\u7684\u65f6\u95f4\u751a\u81f3\u6bd4\u548c\u4f60\u5973\u670b\u53cb\u76f8\u5904\u7684\u65f6\u95f4\u8981\u957f\u3002\n\t\t<\/p>\n<\/li>\n

  2. \n

    \n\t\t\t\u4e3b\u6d41\u7a0b\u590d\u6742\u5ea6\u4e0d\u5927\u3002SpringBoot \u7684\u4e3b\u6d41\u7a0b\u975e\u5e38\u7684\u7b80\u5355\u3002\u731c\u900f\u8fd9\u4e2a\u6846\u67b6\u7684\u539f\u7406\u548c\u8bbe\u8ba1\u601d\u8def\u6bd4\u731c\u5bf9\u5973\u5b69\u5b50\u7684\u5fc3\u601d\u7b80\u76f4\u7b80\u5355\u592a\u591a\u4e86!\n\t\t<\/p>\n<\/li>\n

  3. \n

    \n\t\t\t\u9762\u8bd5\u5fc5\u95ee\u3002\u50cf if else \u8fd9\u79cd"\u5766\u8bda\u76f8\u5f85"\u7684\u4ee3\u7801\u9762\u8bd5\u6839\u672c\u6ca1\u4eba\u95ee\uff0c\u76f8\u53cd\u50cf SpringBoot \u8fd9\u6837\u505a\u4e86\u5927\u91cf\u81ea\u52a8\u914d\u7f6e\u7684"\u72b9\u62b1\u7435\u7436\u534a\u906e\u9762"\u7684\u8bbe\u8ba1\u9762\u8bd5\u603b\u662f\u4e00\u4e0a\u6765\u5c31\u8981\u628a\u539f\u7406\u6252\u4e2a\u7cbe\u5149\u3002\n\t\t<\/p>\n<\/li>\n<\/ol>\n

    \n\t\u6240\u4ee5\uff0c\u4e3a\u4e86\u9ad8\u85aa\u3002\u6211\u4eec\u5c31\u8981\u5367\u85aa\u5c1d\u80c6\u3002\n<\/p>\n

    \n\t\u4e3b\u6d41\u7a0b\u4e0d\u590d\u6742\uff1f\u55ef\uff0c\u771f\u4e0d\u590d\u6742\uff0c\u4e0d\u884c\u6211\u7ed9\u4f60\u7b80\u5355\u7684\u89e3\u91ca\u4e00\u4e0b\u3002\n<\/p>\n

    \n\t\u7b2c\u4e00\u6b65\uff0c\u4ece @SpringBootApplication \u5f00\u59cb\u3002\n<\/p>\n

    \r\n@SpringBootApplication\r\npublic class XttblogApplication {\r\n    public static void main(String[] args) {\r\n        SpringApplication.run(XttblogApplication.class, args);\r\n    }\r\n}<\/pre>\n
    \n\t\u7b2c\u4e8c\u6b65\uff0c\u770b @SpringBootApplication \u6ce8\u89e3\u7c7b\u3002\n<\/p>\n
    \r\n@Target(ElementType.TYPE)\r\n@Retention(RetentionPolicy.RUNTIME)\r\n@Documented\r\n@Inherited\r\n@SpringBootConfiguration\r\n@EnableAutoConfiguration\r\n@ComponentScan(excludeFilters = {\r\n        @Filter(type = FilterType.CUSTOM, classes = TypeExcludeFilter.class),\r\n        @Filter(type = FilterType.CUSTOM, classes = AutoConfigurationExcludeFilter.class) })\r\npublic @interface SpringBootApplication {\r\n    ...\r\n}<\/pre>\n
    \n\t\u7b2c\u4e09\u6b65\uff0c\u770b @EnableAutoConfiguration \u6ce8\u89e3\u7c7b\u3002\n<\/p>\n
    \r\n@Target(ElementType.TYPE)\r\n@Retention(RetentionPolicy.RUNTIME)\r\n@Documented\r\n@Inherited\r\n@AutoConfigurationPackage\r\n@Import(EnableAutoConfigurationImportSelector.class)\r\npublic @interface EnableAutoConfiguration {\r\n    ...\r\n}<\/pre>\n
    \n\t\u7b2c\u56db\u6b65\uff0c\u770b EnableAutoConfigurationImportSelector \u7c7b\u3002\n<\/p>\n
    \r\n@Deprecated\r\npublic class EnableAutoConfigurationImportSelector\r\n        extends AutoConfigurationImportSelector {\r\n    @Override\r\n    protected boolean isEnabled(AnnotationMetadata metadata) {\r\n        if (getClass().equals(EnableAutoConfigurationImportSelector.class)) {\r\n            return getEnvironment().getProperty(\r\n                    EnableAutoConfiguration.ENABLED_OVERRIDE_PROPERTY, Boolean.class,\r\n                    true);\r\n        }\r\n        return true;\r\n    }\r\n}<\/pre>\n
    \n\t\u7b2c\u4e94\u6b65\uff0c\u770b AutoConfigurationImportSelector \u7c7b\u4e2d\u7684 selectImports \u548c getCandidateConfigurations \u65b9\u6cd5\u3002\n<\/p>\n
    \r\n@Override\r\npublic String[] selectImports(AnnotationMetadata annotationMetadata) {\r\n    if (!isEnabled(annotationMetadata)) {\r\n        return NO_IMPORTS;\r\n    }\r\n    try {\r\n        AutoConfigurationMetadata autoConfigurationMetadata = AutoConfigurationMetadataLoader\r\n                .loadMetadata(this.beanClassLoader);\r\n        AnnotationAttributes attributes = getAttributes(annotationMetadata);\r\n        List<String> configurations = getCandidateConfigurations(annotationMetadata,\r\n                attributes);\r\n        configurations = removeDuplicates(configurations);\r\n        configurations = sort(configurations, autoConfigurationMetadata);\r\n        Set<String> exclusions = getExclusions(annotationMetadata, attributes);\r\n        checkExcludedClasses(configurations, exclusions);\r\n        configurations.removeAll(exclusions);\r\n        configurations = filter(configurations, autoConfigurationMetadata);\r\n        fireAutoConfigurationImportEvents(configurations, exclusions);\r\n        return configurations.toArray(new String[configurations.size()]);\r\n    }\r\n    catch (IOException ex) {\r\n        throw new IllegalStateException(ex);\r\n    }\r\n}\r\nprotected List<String> getCandidateConfigurations(AnnotationMetadata metadata,\r\n        AnnotationAttributes attributes) {\r\n    List<String> configurations = SpringFactoriesLoader.loadFactoryNames(\r\n            getSpringFactoriesLoaderFactoryClass(), getBeanClassLoader());\r\n    Assert.notEmpty(configurations,\r\n            "No auto configuration classes found in META-INF\/spring.factories. If you "\r\n                    + "are using a custom packaging, make sure that file is correct.");\r\n    return configurations;\r\n}<\/pre>\n
    \n\t\u7b2c\u516d\u6b65\uff0cSpringFactoriesLoader \u7c7b\u7684 loadFactoryNames \u65b9\u6cd5\u3002\n<\/p>\n
    \r\npublic static List<String> loadFactoryNames(Class<?> factoryClass, ClassLoader classLoader) {\r\n    String factoryClassName = factoryClass.getName();\r\n    try {\r\n        Enumeration<URL> urls = (classLoader != null ? classLoader.getResources(FACTORIES_RESOURCE_LOCATION) :\r\n                ClassLoader.getSystemResources(FACTORIES_RESOURCE_LOCATION));\r\n        List<String> result = new ArrayList<String>();\r\n        while (urls.hasMoreElements()) {\r\n            URL url = urls.nextElement();\r\n            Properties properties = PropertiesLoaderUtils.loadProperties(new UrlResource(url));\r\n            String factoryClassNames = properties.getProperty(factoryClassName);\r\n            result.addAll(Arrays.asList(StringUtils.commaDelimitedListToStringArray(factoryClassNames)));\r\n        }\r\n        return result;\r\n    }\r\n    catch (IOException ex) {\r\n        throw new IllegalArgumentException("Unable to load [" + factoryClass.getName() +\r\n                "] factories from location [\" + FACTORIES_RESOURCE_LOCATION + \"]", ex);\r\n    }\r\n}<\/pre>\n
    \n\t\u91cd\u70b9\u770b\u8fd9\u4e2a FACTORIES_RESOURCE_LOCATION \u3002\n<\/p>\n
    \r\npublic static final String \r\n    FACTORIES_RESOURCE_LOCATION = "META-INF\/spring.factories";<\/pre>\n
    \n\t\u4ee5 spring-boot-autoconfigure-1.5.13.RELEASE.jar \u4e3a\u4f8b\uff0c\u770b\u4e0b\u5b83\u7684 META-INF\/spring.factories \u6587\u4ef6\u3002\n<\/p>\n
    \r\n# Auto Configure\r\norg.springframework.boot.autoconfigure.EnableAutoConfiguration=\\\r\norg.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\\\r\norg.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\\\r\n... \u7701\u7565<\/pre>\n
    \n\t\u5230\u6b64\u6574\u4e2a SpringBoot \u7684\u81ea\u52a8\u914d\u7f6e\uff0c\u81ea\u52a8\u52a0\u8f7d\u4e3b\u6d41\u7a0b\u6e90\u7801\u5df2\u7ecf\u770b\u5b8c\u4e86\u3002\n<\/p>\n
    \n\t\u6574\u4e2a\u8fc7\u7a0b\uff0c\u603b\u7ed3\u4e00\u4e0b\u5c31\u662f\u4f60\u628a\u4f60\u7684\u7ec4\u4ef6\u7684\u5168\u7c7b\u540d\u7ed9\u6211\uff0c\u6211\u5e2e\u4f60\u521d\u59cb\u5316\u4f60\u7ed9\u6211\u7684\u8fd9\u4e9b bean\u3002\n<\/p>\n
    \n\t\u8fd9\u4e2a\u8fc7\u7a0b\u6211\u5728\u5570\u55e6\u4e00\u4e0b\uff0c\u6d41\u7a0b\u5982\u4e0b\uff1a\n<\/p>\n