applicationContext.xml

    
    
         
     
    复制代码

Studnet.java

package test2;import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Component;@Component(value = "student1")public class Student1 {    @Value("lisi")    private String name ;    @Value("123")    private int age;    public String getName() {        return name;    }    @Override    public String toString() {        return "Student{" +                "name='" + name + '\'' +                ", age=" + age +                '}';    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }}复制代码

run_test

package test2;import org.springframework.beans.factory.BeanFactory;import org.springframework.beans.factory.support.BeanDefinitionReader;import org.springframework.beans.factory.support.BeanDefinitionRegistry;import org.springframework.beans.factory.support.DefaultListableBeanFactory;import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;import org.springframework.beans.factory.xml.XmlBeanFactory;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.core.io.ClassPathResource;import org.springframework.core.io.Resource;public class run_test {    public static void main(String[] args) {        fun3();    }    public static void fun1(){        Resource resource = new ClassPathResource("applicationContext.xml");        BeanFactory factory = new DefaultListableBeanFactory();        BeanDefinitionReader  reader = new XmlBeanDefinitionReader((BeanDefinitionRegistry) factory);        reader.loadBeanDefinitions(resource);        Student1 student1 = (Student1) factory.getBean("student1");        System.out.println(student1);    }    public static void fun2(){        ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");        Student1 student1 = (Student1) ac.getBean("student1");        System.out.println(student1);    }    public static void fun3(){        Resource resource1 = new ClassPathResource("applicationContext.xml");        BeanFactory beanFactory1 = new XmlBeanFactory(resource1);        Student1 student1 = (Student1) beanFactory1.getBean("student1");        System.out.println(student1);    }}复制代码

只有第二种才能正确的创建studnent1的bean，fun1() 和 fun3()结果都是

Student{name='null', age=0}复制代码