1.
Spring属性注入有四种方式,分别为set方法注入、构造函数注入、p名称空间注入、spel注入,前两种为主要的注入方式。
构造器方式
user pojo类
package User;
public class User {
private String name;
private int id;
public User(String name,int id) {
this.name = name;
this.id = id;
System.out.println("1111111111");
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Override
public String toString() {
return "User{" +
"name='" + name + '\'' +
", id=" + id +
'}';
}
}
xml配置文件
<bean id="user" class="User.User">
<constructor-arg name="name" value="kong"></constructor-arg>
<constructor-arg name="id" value="1"></constructor-arg>
<property name="name" value="wang"></property>
</bean>
Test
测试类
public class UserTest {
public static void main(String[] args) {
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("user.xml");
User user=(User) applicationContext.getBean("user");
String s= user.toString();
System.out.println(s);
}
}
编译效果