用dw如何做网站,seo短视频网页入口引流网址,网站开发后的经验总结,wordpress国内打开速度慢17、Bean的生命周期 bean的生命周期#xff1a;bean的创建—初始化—销毁的过程 容器负责管理bean的生命周期 我们可以自定义初始化和销毁方法#xff0c;容器在bean进行到当前生命周期的时候来调用我们自定义的初始化和销毁方法 构造#xff08;对象创建#xff09; 单…17、Bean的生命周期 bean的生命周期bean的创建—初始化—销毁的过程 容器负责管理bean的生命周期 我们可以自定义初始化和销毁方法容器在bean进行到当前生命周期的时候来调用我们自定义的初始化和销毁方法 构造对象创建 单实例在容器启动时创建对象 多实例在每次获取的时候创建对象 初始化 单实例容器 关闭的时候 多实例容器不会管理这个bean容器不会调用销毁方法如果需要销毁必须使用手动调用。 指定初始化和销毁方法有三种 1、使用Bean(initMethod “init”,destroyMethod “destory”) 2、通过让Bean实现InitializingBean接口来定义初始化逻辑 DisposableBean接口来销毁bean 3、PostConstruct、PreDestory注解初始化和销毁方式 4、BeanPostProcessor后置处理器在bean初始化进行相应操作
18、Bean(initMethod “init”,destroyMethod “destory”)指定初始化和销毁方式
1指定初始化和销毁方式 使用Bean(initMethod “init”,destroyMethod “destory”) 多实例bean的销毁由用户自定义容器不再管理 指定前
创建bean并设置初始化和销毁方法
public class Car {public Car(){System.out.println(car is constructor........);}public void init(){System.out.println(car is inited........);}public void destory(){System.out.println(car is destoried.....);}
}
创建配置类并配置bean
Configuration
public class MainConfigOfLifeCycle {Beanpublic Car car(){return new Car();}
}
测试类 public class testLife {//创建ioc容器AnnotationConfigApplicationContext annotationConfigApplicationContext new AnnotationConfigApplicationContext(MainConfigOfLifeCycle.class);Testpublic void testLifeCycle(){System.out.println( 容器创建完成);}
}
测试结果
car is constructor........容器创建完成指定后 创建配置类并配置bean 注意 Bean(initMethod “init”,destroyMethod “destory”)
Configuration
public class MainConfigOfLifeCycle {Bean(initMethod init,destroyMethod destory)public Car car(){return new Car();}
}测试类
public class testLife {//创建ioc容器AnnotationConfigApplicationContext applicationContext new AnnotationConfigApplicationContext(MainConfigOfLifeCycle.class);Testpublic void testLifeCycle(){System.out.println(容器创建完成);applicationContext.close();}
}测试结果
car is constructor........
car is inited........
容器创建完成
car is destoried.....
19、InitializingBean接口定义初始化和销毁方式
2通过让Bean实现InitializingBean接口来定义初始化逻辑 DisposableBean接口来销毁bean
创建自定义bean并实现InitializingBean、DisposableBean接口同时改写destory和afterPropertiesSet()方法
Component
public class Cat implements InitializingBean, DisposableBean {public Cat() {System.out.println(cat is generated.....);}//销毁方法Overridepublic void destroy() throws Exception {System.out.println(cat is destoried ......);}//初始化方法Overridepublic void afterPropertiesSet() throws Exception {System.out.println(cat is inited ......);}
}
修改配置类
Configuration
ComponentScan(com.atguigu)
public class MainConfigOfLifeCycle {Bean(initMethod init,destroyMethod destory)public Car car(){return new Car();}
}
测试类
public class testLife {//创建ioc容器AnnotationConfigApplicationContext applicationContext new AnnotationConfigApplicationContext(MainConfigOfLifeCycle.class);Testpublic void testLifeCycle(){System.out.println(容器创建完成);applicationContext.getBean(cat);applicationContext.close();}
}测试结果
cat is generated.....
cat is inited ......
car is constructor........
car is inited........
容器创建完成
car is destoried.....
cat is destoried ......20、PostConstruct、PreDestory注解初始化和销毁方式
3通过让Bean实现PostConstruct接口来定义初始化逻辑 PreDestory接口来销毁bean PostConstuct在bean创建完成并且属性赋值完成初始化方法,作用在方法上 preDestory:再容器销毁bean之前通知我们进行清理工作
比较好的一篇文章 PostConstruct详解
**创建bean类并添加相应注解 **
Component
public class Dog {public Dog() {System.out.println(dog is generated);}//对象创建并赋值之后调用PostConstructpublic void init(){System.out.println(dog is constructed ......);}//容器移除对象之前PreDestroypublic void destory(){System.out.println(dog is destoried ......);}
}测试类
public class testLife {//创建ioc容器AnnotationConfigApplicationContext applicationContext new AnnotationConfigApplicationContext(MainConfigOfLifeCycle.class);Testpublic void testLifeCycle(){System.out.println(容器创建完成);//applicationContext.getBean(cat);applicationContext.close();}
}
测试结果
cat is generated.....
cat is inited ......
dog is generated
car is constructor........
car is inited........
容器创建完成
car is destoried.....
cat is destoried ......21、BeanPostProcessor后置处理器
4BeanPostProcessor后置处理器在bean初始化进行相应操作包括 postProcessBeforeInitialization:在初始化之前工作 postProcessAfterInitialization:在初始化之后工作调用
具体来说需要事项BeanPostProcessor接口并改写postProcessBeforeInitialization(Object o, String s)、postProcessAfterInitialization(Object o, String s)方法
创建自定义后置处理器
Component
public class MyBeanPostProcessor implements BeanPostProcessor {Overridepublic Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {System.out.println(初始化完成前工作调用beanNamebean);return bean;}Overridepublic Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {System.out.println(初始化完成后工作调用beanNamebean);return bean;}
}
测试类
public class testLife {//创建ioc容器AnnotationConfigApplicationContext applicationContext new AnnotationConfigApplicationContext(MainConfigOfLifeCycle.class);Testpublic void testLifeCycle(){System.out.println(容器创建完成);//applicationContext.getBean(cat);applicationContext.close();}
}
测试结果
初始化完成前工作调用org.springframework.context.event.internalEventListenerProcessororg.springframework.context.event.EventListenerMethodProcessor4b5189ac
初始化完成后工作调用org.springframework.context.event.internalEventListenerProcessororg.springframework.context.event.EventListenerMethodProcessor4b5189ac
初始化完成前工作调用org.springframework.context.event.internalEventListenerFactoryorg.springframework.context.event.DefaultEventListenerFactory704deff2
初始化完成后工作调用org.springframework.context.event.internalEventListenerFactoryorg.springframework.context.event.DefaultEventListenerFactory704deff2
初始化完成前工作调用mainConfigOfLifeCyclecom.atguigu.config.MainConfigOfLifeCycle$$EnhancerBySpringCGLIB$$9bbbd82c2b9ed6da
初始化完成后工作调用mainConfigOfLifeCyclecom.atguigu.config.MainConfigOfLifeCycle$$EnhancerBySpringCGLIB$$9bbbd82c2b9ed6da
cat is generated.....
初始化完成前工作调用catcom.atguigu.bean.Cat59d4cd39
cat is inited ......
初始化完成后工作调用catcom.atguigu.bean.Cat59d4cd39
dog is generated
初始化完成前工作调用dogcom.atguigu.bean.Dog1187c9e8
初始化完成后工作调用dogcom.atguigu.bean.Dog1187c9e8
初始化完成前工作调用mainConfigcom.atguigu.config.MainConfig$$EnhancerBySpringCGLIB$$201ea2bd6d7fc27
初始化完成后工作调用mainConfigcom.atguigu.config.MainConfig$$EnhancerBySpringCGLIB$$201ea2bd6d7fc27
初始化完成前工作调用bookControllercom.atguigu.controller.BookController135606db
初始化完成后工作调用bookControllercom.atguigu.controller.BookController135606db
初始化完成前工作调用bookDAOcom.atguigu.dao.BookDAO6c372fe6
初始化完成后工作调用bookDAOcom.atguigu.dao.BookDAO6c372fe6
初始化完成前工作调用bookServicecom.atguigu.service.BookService2a3888c1
初始化完成后工作调用bookServicecom.atguigu.service.BookService2a3888c1
初始化完成前工作调用com.atguigu.bean.Colorcom.atguigu.bean.Color4167d97b
初始化完成后工作调用com.atguigu.bean.Colorcom.atguigu.bean.Color4167d97b
初始化完成前工作调用com.atguigu.bean.Redcom.atguigu.bean.Red14fa86ae
初始化完成后工作调用com.atguigu.bean.Redcom.atguigu.bean.Red14fa86ae
初始化完成前工作调用com.atguigu.bean.Bluecom.atguigu.bean.Blue6e15fe2
初始化完成后工作调用com.atguigu.bean.Bluecom.atguigu.bean.Blue6e15fe2
初始化完成前工作调用com.atguigu.bean.Yellowcom.atguigu.bean.Yellow68f1b17f
初始化完成后工作调用com.atguigu.bean.Yellowcom.atguigu.bean.Yellow68f1b17f
初始化完成前工作调用femalePerson{namewanger, age23}
初始化完成后工作调用femalePerson{namewanger, age23}
初始化完成前工作调用colorFactoryBeancom.atguigu.bean.ColorFactory7cbd9d24
初始化完成后工作调用colorFactoryBeancom.atguigu.bean.ColorFactory7cbd9d24
初始化完成前工作调用rainbowcom.atguigu.bean.RainBow1b45c0e
初始化完成后工作调用rainbowcom.atguigu.bean.RainBow1b45c0e
car is constructor........
初始化完成前工作调用carcom.atguigu.bean.Car73a8da0f
car is inited........
初始化完成后工作调用carcom.atguigu.bean.Car73a8da0f
容器创建完成car is destoried.....
cat is destoried ......
22、Value为属性赋值
在bean类的属性上直接使用Value注解来赋值
创建bean类pojo类
public class Person {//value的值可以是1、基本数据类型值2、可以写表达式如#{},3、可以用${}取出配置文件的值在运行的环境变量中的值Value(张三)private String name;Value(#{234})private Integer age;public Person() {}public Person(String name, Integer age) {this.name name;this.age age;}public String getName() {return name;}public void setName(String name) {this.name name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age age;}Overridepublic String toString() {return Person{ name name \ , age age };}
}创建配置类
Configuration
public class MainConfigOfPropertyValues {Beanpublic Person person(){return new Person();}}
测试类
public class TestAno {AnnotationConfigApplicationContext applicationContextnew AnnotationConfigApplicationContext(MainConfigOfPropertyValues .class);Testpublic void testProperty(){printBeans(applicationContext);System.out.println();Person person (Person) applicationContext.getBean(person);System.out.println(person);}private void printBeans(AnnotationConfigApplicationContext applicationContext){String[] beanDefinitionNames applicationContext.getBeanDefinitionNames();for (String name:beanDefinitionNames) {System.out.println(name);}}
}
测试结果
org.springframework.context.annotation.internalConfigurationAnnotationProcessor
org.springframework.context.annotation.internalAutowiredAnnotationProcessor
org.springframework.context.annotation.internalRequiredAnnotationProcessor
org.springframework.context.annotation.internalCommonAnnotationProcessor
org.springframework.context.event.internalEventListenerProcessor
org.springframework.context.event.internalEventListenerFactory
mainConfigOfPropertyValues
personPerson{name张三, age27}23、PropertySource加载外部配置文件属性赋值
需要加载外部配置文件读取配置文件中 的k/v保存到运行中的环境变量中
1、创建配置文件在文件中创建若干键值对 创建文件 person.properties
person.namezhangsanfeng2、在配置类中使用PropertySource指定配置文件 注意PropertySource(value{“classpath:/person.properties”})
//加载外部配置文件读取配置文件中 的k/v保存到运行中的环境变量中
PropertySource(value{classpath:/person.properties})
Configuration
public class MainConfigOfPropertyValues {Beanpublic Person person(){return new Person();}
}3、bean类中引用相应的值 注意 Value(“${person.name}”) private String name; public class Person {//value的值可以是1、基本数据类型值2、可以写表达式如#{},3、可以用${}取出配置文件的值在运行的环境变量中的值Value(${person.name})private String name;Value(#{234})private Integer age;public Person() {}public Person(String name, Integer age) {this.name name;this.age age;}public String getName() {return name;}public void setName(String name) {this.name name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age age;}Overridepublic String toString() {return Person{ name name \ , age age };}
}
4、测试类
public class TestAno {AnnotationConfigApplicationContext applicationContextnew AnnotationConfigApplicationContext(MainConfigOfPropertyValues .class);Testpublic void testProperty(){printBeans(applicationContext);System.out.println();Person person (Person) applicationContext.getBean(person);System.out.println(person);ConfigurableEnvironment environment applicationContext.getEnvironment();String propertyenvironment.getProperty(person.name);System.out.println(property);}private void printBeans(AnnotationConfigApplicationContext applicationContext){String[] beanDefinitionNames applicationContext.getBeanDefinitionNames();for (String name:beanDefinitionNames) {System.out.println(name);}}
}5、测试结果 注意Person{name‘zhangsanfeng’, age27}
org.springframework.context.annotation.internalConfigurationAnnotationProcessor
org.springframework.context.annotation.internalAutowiredAnnotationProcessor
org.springframework.context.annotation.internalRequiredAnnotationProcessor
org.springframework.context.annotation.internalCommonAnnotationProcessor
org.springframework.context.event.internalEventListenerProcessor
org.springframework.context.event.internalEventListenerFactory
mainConfigOfPropertyValues
personPerson{namezhangsanfeng, age27}
zhangsanfeng24、Autowired自动装配
自动装配Spring利用依赖注入DI完成对IOC容器中各个组件的依赖关系赋值
1)Autowired 一个组件需要使用到另外一个组件直接对被使用的组件上添加Autowired注解就可以注入这个组件。它
默认优先按照类型去容器内找到对应的组件如 BookDAO bookDAO applicationContext.getBean(BookDAO.class);如果有多个同类型的组件,再将属性名作为组件的id去容器中查找(没测试出来总是报找到两个bean)
dao类
Repository
public class BookDAO {
}
service类
Service
public class BookService {Autowiredprivate BookDAO bookDao;public void print(){System.out.println(bookDao);}
}
controller
Controller
public class BookController {Autowiredprivate BookService bookService;
}
配置类
Configuration
ComponentScan({com.atguigu})
public class MainConfigAutowired {
}
测试类
public class TestAuto {AnnotationConfigApplicationContext applicationContext new AnnotationConfigApplicationContext(MainConfigAutowired.class);Testpublic void testAutowired(){BookService bookService applicationContext.getBean(BookService.class);BookDAO bookDAO applicationContext.getBean(BookDAO.class);System.out.println(bookService);System.out.println(bookDAO);}
}测试结果
com.atguigu.service.BookService7357a011
com.atguigu.dao.BookDAO30bce90b25、Qualifier自动装配
Qualifier明确指定需要装配哪一个组件,具体写法如Qualifier“bookDAO3”
Configuration
ComponentScan({com.atguigu})
public class MainConfigAutowired {Qualifier(bookDAO)Bean(bookDAO2)public BookDAO bookDAO(){BookDAO bookDAO new BookDAO();bookDAO.setLable(2);return bookDAO;}
}
26、Primary自动装配
如果容器内没有任何bean单IOC自动装配默认一定要将属性装配好否则会报错可以使用在Autowiredrequiredfalse),这里设置了required为非必须
以上情况可以使用Primary来让Spring装配的时候选择该注解的类为首选类
Configuration
ComponentScan({com.atguigu})
public class MainConfigAutowired {Qualifier(bookDAO)Bean(bookDAO2)public BookDAO bookDAO(){BookDAO bookDAO new BookDAO();bookDAO.setLable(2);return bookDAO;}
}
27、Resource自动装配
Resource是用来 替代Autowired的和Autowired一样实现自动装配默认按照组件名称进行装配没有能支持Primary
Service
public class BookService {Resourceprivate BookDAO bookDAO2;public void print(){System.out.println(bookDAO2);}
}
28、Inject自动装配
也是用来替代Autowired的需要在pom.xml中导入inject依赖
dependencygroupIdjavax.inject/groupIdartifactIdjavax.inject/artifactIdversion1/version/dependency装配的写法
Service
public class BookService {Injectprivate BookDAO bookDAO2;public void print(){System.out.println(bookDAO2);}
}29、标注在方法上方法的自动装配
默认加在ioc容器的组件容器启动会调用无参构造器创建对象再进行初始化等操作
标注在方法上Spring容器 创建当前对象就会调用方法完成赋值 方法使用的参数自定义类型的值从ioc容易中获取标注在构造方法上也可以放在参数列表上
Boos类
Component
public class Boss {private Car car;public Car getCar(){return car;}//标注在方法上Spring容器 创建当前对象就会调用方法完成赋值//方法使用的参数自定义类型的值从ioc容易中获取Autowiredpublic void setCar(Car car){this.carcar;}Overridepublic String toString() {return Boss{ car car };}
}
Car类 Component
public class Car {
}
测试 类
public class TestAuto {Testpublic void testAutowired(){AnnotationConfigApplicationContext applicationContext new AnnotationConfigApplicationContext(MainConfigAutowired.class);Boss Boos applicationContext.getBean(Boss.class);System.out.println(Boos);Car car applicationContext.getBean(Car.class);System.out.println(car);}
}
测试结果
Boss{carcom.atguigu.bean.Car198d6542}
com.atguigu.bean.Car198d6542ps:两个car对象的地址是一样的如果只有一个有参构造器则参数上的Autowired可以不写可以从组件中自动获取
30、标注在构造器位置的自动装配
也可以把Autowried放在有参构造器上
Component
public class Boss {private Car car;Autowiredpublic Boss(Car car) {this.car car;}public Car getCar(){return car;}//标注在方法上Spring容器 创建当前对象就会调用方法完成赋值//方法使用的参数自定义类型的值从ioc容易中获取//Autowiredpublic void setCar(Car car){this.carcar;}Overridepublic String toString() {return Boss{ car car };}
}还可以放在参数列表上
Component
public class Boss {private Car car;public Boss(Car car) {this.car car;}public Car getCar(){return car;}//标注在方法上Spring容器 创建当前对象就会调用方法完成赋值//方法使用的参数自定义类型的值从ioc容易中获取//Autowiredpublic void setCar(Autowired Car car){this.carcar;}Overridepublic String toString() {return Boss{ car car };}
}
31、Aware注入Spring底层组件
自定义组件要想使用Spring容器底层的一些组件ApplicationContextBeanFactory等
自定义组件实现XXXAware在创建对象 的时候会调用接口规定的方法注入相应组件Aware把Spring底层的一些组件注入到自定义的bean中 bean类 Component
public class Red implements ApplicationContextAware, BeanNameAware, EmbeddedValueResolverAware {private ApplicationContext applicationContext;//获得一个注解的环境Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {this.applicationContextapplicationContext;System.out.println(applicationContext);}//可以设置bean的名字Overridepublic void setBeanName(String name) {System.out.println(name);}//传入String值的解析器Overridepublic void setEmbeddedValueResolver(StringValueResolver stringValueResolver) {String osName stringValueResolver.resolveStringValue(你好${os.name});System.out.println(osName);}
}测试类 public class TestAuto {Testpublic void testAutowired(){AnnotationConfigApplicationContext applicationContext new AnnotationConfigApplicationContext(MainConfigAutowired.class);}
}
测试结果
red
你好Mac OS X
org.springframework.context.annotation.AnnotationConfigApplicationContext214b199c: startup date [Mon Jul 31 11:27:51 CST 2023]; root of context hierarchy
32、Profile环境搭建
Profile是Spring为我们提供的可以根据当前环境动态的激活和切换一系列组件bean的功能。
环境开发环境测试环境生产环境在不同环境下可能链接不同的数据库因此需要可以根据当前环境动态的激活和切换一系列组件。
如引不同的数据源需要导入以下依赖 c3p0和mysql链接驱动
!-- https://mvnrepository.com/artifact/com.mchange/c3p0 --dependencygroupIdcom.mchange/groupIdartifactIdc3p0/artifactIdversion0.9.2/version/dependency!-- https://mvnrepository.com/artifact/com.mysql/mysql-connector-j --dependencygroupIdcom.mysql/groupIdartifactIdmysql-connector-j/artifactIdversion8.0.32/version/dependency创建dbConfig.propreties
db.userroot
db.passwordxxxxxxxx
db.driverClasscom.mysql.cj.jdbc.Driver创建配置类
PropertySource(classpath:/dbConfig.properties)
Configuration
public class MainConfigProfile implements EmbeddedValueResolverAware {Value(${db.user})private String user;//值解析器private StringValueResolver valueResolver;private String driverClass;Bean(productDatasource)public DataSource dataSource(Value(${db.password}) String password) throws PropertyVetoException {ComboPooledDataSource dataSource new ComboPooledDataSource();dataSource.setUser(user);dataSource.setPassword(password);dataSource.setJdbcUrl(jdbc:mysql://localhost8080:3306/fruitdb);//使用值解析器解析driverdataSource.setDriverClass(driverClass);return dataSource;}Bean(testDatasource)public DataSource dataSourceTest(Value(${db.password}) String password) throws PropertyVetoException {ComboPooledDataSource dataSource new ComboPooledDataSource();dataSource.setUser(user);dataSource.setPassword(password);dataSource.setJdbcUrl(jdbc:mysql://localhost8080:3306/empdb);dataSource.setDriverClass(driverClass);return dataSource;}Bean(developmentDatasource)public DataSource dataSourceDevelopment(Value(${db.password}) String password) throws PropertyVetoException {ComboPooledDataSource dataSource new ComboPooledDataSource();dataSource.setUser(user);dataSource.setPassword(password);dataSource.setJdbcUrl(jdbc:mysql://localhost8080:3306/userDb);dataSource.setDriverClass(driverClass);return dataSource;}Overridepublic void setEmbeddedValueResolver(StringValueResolver stringValueResolver) {this.valueResolverstringValueResolver;this.driverClassthis.valueResolver.resolveStringValue(${db.driverClass});}
}
测试类
public class TestAuto {Testpublic void testAutowired(){AnnotationConfigApplicationContext applicationContext new AnnotationConfigApplicationContext(MainConfigProfile.class);//获取beans的类名数组String[] beanNamesForType applicationContext.getBeanNamesForType(DataSource.class);for (String name: beanNamesForType ) {System.out.println(name);}}
}测试结果
productDatasource
testDatasource
developmentDatasource33、Profile根据环境注册bean
Profile:指定组件在哪个环境的情况下才能被注册到容器中不指定的话在任何情况下都能注册组件加了环境标识Profile的bean只有这个环境被激活才能注册到容器中默认都default标识被注册没有标注环境标识的bean在任何环境下都是加载的 Profile(default)如何激活 1使用命令行动态参数在虚拟机参数位置加载-Dspring.profiles.activetest或其他标识 2)代码方式 配置类
PropertySource(classpath:/dbConfig.properties)
Configuration
public class MainConfigProfile implements EmbeddedValueResolverAware {Value(${db.user})private String user;//值解析器private StringValueResolver valueResolver;private String driverClass;Profile(test)Beanpublic Red red(){return new Red();}//定义生产环境Profile(product)Bean(productDatasource)public DataSource dataSource(Value(${db.password}) String password) throws PropertyVetoException {ComboPooledDataSource dataSource new ComboPooledDataSource();dataSource.setUser(user);dataSource.setPassword(password);dataSource.setJdbcUrl(jdbc:mysql://localhost8080:3306/fruitdb);//使用值解析器解析driverdataSource.setDriverClass(driverClass);return dataSource;}//定义测试环境Profile(test)Bean(testDatasource)public DataSource dataSourceTest(Value(${db.password}) String password) throws PropertyVetoException {ComboPooledDataSource dataSource new ComboPooledDataSource();dataSource.setUser(user);dataSource.setPassword(password);dataSource.setJdbcUrl(jdbc:mysql://localhost8080:3306/empdb);dataSource.setDriverClass(driverClass);return dataSource;}//定义开发环境Profile(development)Bean(developmentDatasource)public DataSource dataSourceDevelopment(Value(${db.password}) String password) throws PropertyVetoException {ComboPooledDataSource dataSource new ComboPooledDataSource();dataSource.setUser(user);dataSource.setPassword(password);dataSource.setJdbcUrl(jdbc:mysql://localhost8080:3306/userDb);dataSource.setDriverClass(driverClass);return dataSource;}Overridepublic void setEmbeddedValueResolver(StringValueResolver stringValueResolver) {this.valueResolverstringValueResolver;this.driverClassthis.valueResolver.resolveStringValue(${db.driverClass});}
}
测试类
public class TestAuto {Testpublic void testAutowired(){//1.获取一个applicationContextAnnotationConfigApplicationContext applicationContext new AnnotationConfigApplicationContext(MainConfigProfile.class);//2.设置激活的环境applicationContext.getEnvironment().setActiveProfiles(test,product);//设置了两个环境//3.注册住配置类applicationContext.register(MainConfigProfile.class);//4.刷新容器applicationContext.refresh();//获取beans的类名数组String[] beanNamesForType applicationContext.getBeanNamesForType(DataSource.class);for (String name: beanNamesForType ) {System.out.println(name);}}
}
测试结果 应该出现test和product两个组件但在执行refresh的时候报错。GenericApplicationContext does not support multiple refresh attempts: just call ‘refresh’ once
3)不仅可以写在bean上还可以写在类上
Profile(development)
PropertySource(classpath:/dbConfig.properties)
Configuration
public class MainConfigProfile implements EmbeddedValueResolverAware {表示只有环境为development的时候只有是指定的环境的时候整个配置类里面的所有配置才生效
