Spring注解驱动

Spring注解

1、Spring注解如下图所示：

2、xml配置方式

实体类

public class Person {
    private String name;

    private String age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public Person(String name, String age) {
        this.name = name;
        this.age = age;
    }

    public Person() {
    }

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age='" + age + '\'' +
                '}';
    }
}

配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="person" class="com.lyc.entity.Person">
        <property name="age" value="10"/>
        <property name="name" value="111"/>
    </bean>

</beans>

测试注入

public class MainTest {

    public static void main(String[] args) {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean.xml");
        Person person = (Person) applicationContext.getBean("person");
        System.out.println(person);
    }
}

结果：

3、注解方式

定义配置类

//配置类===配置文件
@Configuration  //声明一个配置类，并告知Spring
public class MainCofig {

    //给容器注册一个bean,类型为返回值得类型，id默认是用方法作为id
    @Bean
    public Person person(){
        return new Person("2222","10");
    }
}

测试注入：

public class MainTest {

    public static void main(String[] args) {
        ApplicationContext applicationContext =
                new AnnotationConfigApplicationContext(MainCofig.class);
        Person person = (Person) applicationContext.getBean("person");
        System.out.println(person);
    }
}