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本篇內(nèi)容介紹了“Spring Boot怎么排除自動(dòng)加載數(shù)據(jù)源”的有關(guān)知識(shí),在實(shí)際案例的操作過(guò)程中,不少人都會(huì)遇到這樣的困境,接下來(lái)就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧!希望大家仔細(xì)閱讀,能夠?qū)W有所成!
有些老項(xiàng)目使用Spring MVC里面有寫(xiě)好的數(shù)據(jù)庫(kù)連接池,比如redis/mongodb/mybatis(mysql其他Oracle同理)。在這些項(xiàng)目遷入spring boot框架時(shí),會(huì)報(bào)錯(cuò)。
原因是我們業(yè)務(wù)寫(xiě)好了連接池,但spring boot在jar包存在的時(shí)候會(huì)主動(dòng)加載spring boot的autoconfiguration創(chuàng)建連接池,但我們并未配置Spring Boot參數(shù),也不需要配置。
mongodb自動(dòng)配置錯(cuò)誤如下:
org.mongodb.driver.cluster : Exception in monitor thread while connecting to server localhost:27017
com.mongodb.MongoSocketOpenException: Exception opening socket
Caused by: java.net.ConnectException: Connection refused (Connection refused)
但是我沒(méi)有引入spring-boot-starter-data-mongodb的jar包,后來(lái)發(fā)現(xiàn)我引入了spring-data-mongodb的jar
檢查spring-boot-starter-data-mongodb的jar,包括3部分,如下:
我的jar包都有,相當(dāng)于這些jar拼裝成了 spring-boot-starter-data-mongodb
在Spring Boot中自動(dòng)引入了自動(dòng)配置功能
需要手動(dòng)排除自動(dòng)配置的數(shù)據(jù)源,在SpringBootApplication中exclude
@SpringBootApplication(exclude = {MongoAutoConfiguration.class, MongoDataAutoConfiguration.class})
啟動(dòng)不再報(bào)錯(cuò)連接localhost:27017,業(yè)務(wù)正常。原理見(jiàn)Spring Boot官方文檔
mybatis同理
Failed to auto-configure a DataSource: 'spring.datasource.url' is not specified and no embedded data
***************************
APPLICATION FAILED TO START
***************************
Description:
Cannot determine embedded database driver class for database type NONE
Action:
If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (no profiles are currently active).
需要排除
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
原理是EnableAutoConfiguration
進(jìn)一步跟蹤:
AutoConfigurationImportSelector這個(gè)類(lèi)有自動(dòng)加載與排除的邏輯
public String[] selectImports(AnnotationMetadata annotationMetadata) { if (!isEnabled(annotationMetadata)) { return NO_IMPORTS; } AutoConfigurationMetadata autoConfigurationMetadata = AutoConfigurationMetadataLoader .loadMetadata(this.beanClassLoader); AutoConfigurationEntry autoConfigurationEntry = getAutoConfigurationEntry(autoConfigurationMetadata, annotationMetadata); return StringUtils.toStringArray(autoConfigurationEntry.getConfigurations()); }
注意加載代碼
getAutoConfigurationEntry(autoConfigurationMetadata, annotationMetadata);
/** * Return the {@link AutoConfigurationEntry} based on the {@link AnnotationMetadata} * of the importing {@link Configuration @Configuration} class. * @param autoConfigurationMetadata the auto-configuration metadata * @param annotationMetadata the annotation metadata of the configuration class * @return the auto-configurations that should be imported */ protected AutoConfigurationEntry getAutoConfigurationEntry(AutoConfigurationMetadata autoConfigurationMetadata, AnnotationMetadata annotationMetadata) { if (!isEnabled(annotationMetadata)) { return EMPTY_ENTRY; } AnnotationAttributes attributes = getAttributes(annotationMetadata); List<String> configurations = getCandidateConfigurations(annotationMetadata, attributes); configurations = removeDuplicates(configurations); Set<String> exclusions = getExclusions(annotationMetadata, attributes); checkExcludedClasses(configurations, exclusions); configurations.removeAll(exclusions); configurations = filter(configurations, autoConfigurationMetadata); fireAutoConfigurationImportEvents(configurations, exclusions); return new AutoConfigurationEntry(configurations, exclusions); }
里面
getExclusions(annotationMetadata, attributes);
/** * Return any exclusions that limit the candidate configurations. * @param metadata the source metadata * @param attributes the {@link #getAttributes(AnnotationMetadata) annotation * attributes} * @return exclusions or an empty set */ protected Set<String> getExclusions(AnnotationMetadata metadata, AnnotationAttributes attributes) { Set<String> excluded = new LinkedHashSet<>(); excluded.addAll(asList(attributes, "exclude")); excluded.addAll(Arrays.asList(attributes.getStringArray("excludeName"))); excluded.addAll(getExcludeAutoConfigurationsProperty()); return excluded; }
看到了,exclude或者excludeName,當(dāng)然還有一種方法
private List<String> getExcludeAutoConfigurationsProperty() { if (getEnvironment() instanceof ConfigurableEnvironment) { Binder binder = Binder.get(getEnvironment()); return binder.bind(PROPERTY_NAME_AUTOCONFIGURE_EXCLUDE, String[].class).map(Arrays::asList) .orElse(Collections.emptyList()); } String[] excludes = getEnvironment().getProperty(PROPERTY_NAME_AUTOCONFIGURE_EXCLUDE, String[].class); return (excludes != null) ? Arrays.asList(excludes) : Collections.emptyList(); }
通過(guò)application.properties文件配置spring.autoconfigure.exclude
private static final String PROPERTY_NAME_AUTOCONFIGURE_EXCLUDE = "spring.autoconfigure.exclude";
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