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}")** | **\** **\{book.bname}"/\>** **\$

java 复制代码

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

java 复制代码

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">

java 复制代码

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

4、BookTest.java

java 复制代码

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; @BeforeEach public void setup() { beanFactory = new AnnotationConfigApplicationContext(MySpringConfiguration.class); } @Test public 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

XML 复制代码

<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

XML 复制代码

<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>