标签:cep col 实例 play pen closed sed not 使用外部
引用Bean的属性值
从Spring3.0开始,可以通过#{beanName.beanProp}的方式方便地引用另一个bean的属性值
1、不需要使用PropertyPlaceholderConfigurer。
2、这里是井号
demo
1、xml配置实现
package test; import org.springframework.beans.factory.annotation.Value; public class User { private String name; @Value("#{initUser.age}") private int age; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } }
package test; class InitUser { private int age; private String name; public void initAgeName() throws InterruptedException { Thread.sleep(9000); this.age = 47; this.name = "zs"; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!--开启包扫描,因为User类使用到了@Value注解;包扫描不支持裸体类上的注解 --> <context:component-scan base-package="test"/> <!-- 使用外部属性文件值赋值 --> <bean id="user" class="test.User" p:name="#{initUser.name}"/> <!-- 实例化InitUser --> <bean id="initUser" class="test.InitUser" init-method="initAgeName"/> </beans>
package test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Driver { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext("my.xml"); User user = context.getBean("user", User.class); System.out.println(user.getName()); System.out.println(user.getAge()); } }
2、Java配置实现
package test; import org.springframework.beans.factory.annotation.Value; public class User { @Value("#{initUser.name}") private String name; @Value("#{initUser.age}") private int age; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } }
package test; class InitUser { private int age; private String name; public void initAgeName() throws InterruptedException { Thread.sleep(9000); this.age = 47; this.name = "zs"; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
package test; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; @Configuration @ComponentScan// 因为使用了@Value注解,所以要开启包扫描 public class MyConfig { @Bean public InitUser initUser() throws InterruptedException { InitUser initUser = new InitUser(); initUser.initAgeName(); return initUser; } @Bean public User user() { return new User(); } }
package test; import org.springframework.context.ApplicationContext; import org.springframework.context.annotation.AnnotationConfigApplicationContext; public class Driver { public static void main(String[] args) { ApplicationContext context = new AnnotationConfigApplicationContext(MyConfig.class); User user = context.getBean("user", User.class); System.out.println(user.getName()); System.out.println(user.getAge()); } }
标签:cep col 实例 play pen closed sed not 使用外部
原文地址:https://www.cnblogs.com/Mike_Chang/p/10277406.html