Java - Spring IoC容器配置Bean的方式？

缺乏、安全感 2022-06-06 11:48 176阅读 0赞

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\- 基于XML文件进行配置。   
\- 基于注解进行配置。   
\- 基于Java程序进行配置（Spring 3+）

package chimomo.learning.java.code.spring;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    
    @Component
    public class Person {
        private String name;
        private int age;
        @Autowired
        private Car car;
    
        public Person(String name, int age) {
            this.name = name;
            this.age = age;
        }
    
        public void setCar(Car car) {
            this.car = car;
        }
    
        @Override
        public String toString() {
            return "Person [name=" + name + ", age=" + age + ", car=" + car + "]";
        }
    
    }

package chimomo.learning.java.code.spring;
    
    import org.springframework.stereotype.Component;
    
    @Component
    public class Car {
        private String brand;
        private int maxSpeed;
    
        public Car(String brand, int maxSpeed) {
            this.brand = brand;
            this.maxSpeed = maxSpeed;
        }
    
        @Override
        public String toString() {
            return "Car [brand=" + brand + ", maxSpeed=" + maxSpeed + "]";
        }
    
    }

package chimomo.learning.java.code.spring;
    
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    import chimomo.learning.java.code.spring.Car;
    import chimomo.learning.java.code.spring.Person;
    
    @Configuration
    public class AppConfig {
    
        @Bean
        public Car car() {
            return new Car("Benz", 320);
        }
    
        @Bean
        public Person person() {
            return new Person("X-Man", 34);
        }
    
    }

package chimomo.learning.java.code.spring;
    
    import org.springframework.context.ConfigurableApplicationContext;
    import org.springframework.context.annotation.AnnotationConfigApplicationContext;
    
    import chimomo.learning.java.code.spring.Person;
    import chimomo.learning.java.code.spring.AppConfig;
    
    class Test {
    
        public static void main(String[] args) {
            // TWR (Java 7+)
            try(ConfigurableApplicationContext factory = new AnnotationConfigApplicationContext(AppConfig.class)) {
                Person person = factory.getBean(Person.class);
                System.out.println(person);
            }
        }
    }

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