直接上代码
步骤一： 定义一个实体类Person
package com.dd;
import org.springframework.beans.factory.annotation.Autowired;
public class Person {
public StringgetName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public StringgetAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
private Stringname;
private Stringaddress;
private int age;
}
步骤二： 定义另一个类Customer ，其中含属性Person ,并指明属性person为 @Autowired
package com.dd;
import org.springframework.beans.factory.annotation.Autowired;
public class Customer {
@Autowired
private Person person;
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
public StringgetAction() {
return action;
}
public void setAction(String action) {
this.action = action;
}
private int type;
private Stringaction;
}
步骤三：
新增Spring-config文件: beans.xml （注：此配置文件中未配置Customer BEAN中含有属性Person)
<context:annotation-config />
<bean id="CustomerBean" class="com.dd.Customer">
<property name="action" value="buy" />
<property name="type" value="1" />
<bean id="PersonBean" class="com.dd.Person">
<property name="name" value="LaoWang" />
<property name="address" value="Near" />
<property name="age" value="29" />
步骤四: 编写测试类
package com.dd;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
public static void main(String[] args){
ApplicationContext apc =new ClassPathXmlApplicationContext("Beans.xml");
Customer customer = (Customer)apc.getBean("CustomerBean");
System.out.println(customer.getPerson().getName());
}
}
步骤五： run运行查看结果
如上，可见在beans.xml配置文件中未指明Customer包含属性Person 情况下，在代码中对 private Person person; 使用了注解@@Autowired 时， Person对象会被自动注入到 Customer对象中；
此为@Autowired注解最常用法；
注： beans.xml中必须有配置 <context:annotation-config /> ，否则@Autowired不会生效执行；
