1、src創建applicationContext.xml文件
bean是在applicationContext.xml文件中編寫,把對象放進bean中。
記住要導入相關springbean的包
創建完成
2、bean標籤分析
- class:指定bean的全限定名
- id:bean對象的唯一標記
- name:bean對象的一個名字,也就是別名,建議創建多個
- lazy-init:true延遲加載,默認是false
3、bean的生命週期
destroy-method屬性:
當bean從IOC容器銷燬,會觸發此方法
init-method屬性:
當在IOC容器創建,會觸發此方法
(兩個都是方法,寫在對象中,調用bean時就會自動觸發)
public void initCar()
{
System.out.println("User 創建");
}
public void destoryCar()
{
System.out.println("User銷燬");
}
4、實例代碼展示
User對象
public class User {
private Integer id;
private String name;
private String sex;
private String phone;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", sex='" + sex + '\'' +
", phone='" + phone + '\'' +
'}';
}
}
bean配置
<?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="user" name="user1" class="com.gec.bean.User">
<property name="id">
<value>1</value>
</property>
<property name="name">
<value>dada</value>
</property>
<property name="phone">
<value>10086</value>
</property>
<property name="sex">
<value>boy</value>
</property>
</bean>
</beans>
main實現
import com.gec.bean.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MainTest {
public static void main(String[] args) {
//獲取IOC容器對象,可以用一個ApplicationContext對象描述此IOC容器對象
ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");
//根據配置好的bean中的id獲取bean對象
User user = (User) ctx.getBean("user");
System.out.println(user);
}
}
結果展示