Spring-IOC-@Value和@PropertySource用法

1、Book.java

• @PropertySource(value="classpath:配置文件地址") 替代  <context:property-placeholder location="配置文件地址"/>

• @Value("${book.bid}") @Value("${book.bname}") @Value("${book.price}")

  <bean id="book"  class="com.atguigu.ioc.Book">            <property name="bid"  value="${book.bid}"/>            <property name="bname" vlaue="${book.bname}"/>            <property name="price" value="${book.price}"/> </bean>

package com.atguigu.ioc;
import lombok.Data;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
@Data
@Component
@PropertySource(value = "classpath:book.properties", encoding = "UTF-8")
public class Book {@Value("${book.bid}")private Integer bid;@Value("${book.bname}")private String bname;@Value("${book.price}")private Integer price;
}

2、book.properties

book.bid=1
book.bname=Java入门经典
book.price=99

3、MySpringConfiguration.java

• @ComponentScan(basePackages={"包","包"}) 替代 <context:component-scan base-package="com.atguigu.ioc,等等">

package com.atguigu.ioc;
import org.springframework.context.annotation.ComponentScan;
@ComponentScan
public class MySpringConfiguration {
}

4、BookTest.java

package com.atguigu.ioc;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class BookTest {private BeanFactory beanFactory;@BeforeEachpublic void setup() {beanFactory = new AnnotationConfigApplicationContext(MySpringConfiguration.class);}@Testpublic void test() {System.out.println(beanFactory.getBean(Book.class));}
}
//Book(bid=1, bname=Java入门经典, price=99)

 5、父工程pom.xml

    <packaging>pom</packaging><modules><module>pro04-spring-ioc-xml</module><module>pro00-spring-handwrite</module><module>pro05-spring-ioc-annotation</module></modules><properties><maven.compiler.source>17</maven.compiler.source><maven.compiler.target>17</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><spring.version>6.0.6</spring.version><junit.version>5.3.1</junit.version><lombok.version>1.18.20</lombok.version></properties><dependencyManagement><dependencies><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.junit.jupiter</groupId><artifactId>junit-jupiter-api</artifactId><version>${junit.version}</version><scope>test</scope></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>${lombok.version}</version></dependency></dependencies></dependencyManagement>

6、子工程pom.xml 

    <parent><groupId>com.atguigu</groupId><artifactId>pro-ssm</artifactId><version>1.0-SNAPSHOT</version></parent><artifactId>pro05-spring-ioc-annotation</artifactId><dependencies><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId></dependency><dependency><groupId>org.junit.jupiter</groupId><artifactId>junit-jupiter-api</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency></dependencies>