1、User.java
public class User {
private String name;
public User() {
System.out.println("user无参构造方法");
}
public void setName(String name) {
this.name = name;
}
public void show(){
System.out.println("name="+ name );
}
}
2、beans.xml
<?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" class="com.kuang.pojo.User">
<property name="name" value="kuangshen">
</property></bean>
</beans>
3、测试类
@Test
public void test(){
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
//在执行getBean的时候, user已经创建好了 , 通过无参构造
User user = (User) context.getBean("user");
//调用对象的方法 .
user.show();
}
1、UserT . java
public class UserT {
private String name;
public UserT(String name) {
this.name = name;
}
public void setName(String name) {
this.name = name;
}
public void show(){
System.out.println("name="+ name );
}
}
2、beans.xml 有三种方式编写
<!-- 第一种根据index参数下标设置 -->
<bean id="userT" class="com.kuang.pojo.UserT">
<!-- index指构造方法 , 下标从0开始 -->
<constructor-arg index="0" value="kuangshen2">
</constructor-arg></bean>
<!-- 第二种根据参数名字设置 -->
<bean id="userT" class="com.kuang.pojo.UserT">
<!-- name指参数名 -->
<constructor-arg name="name" value="kuangshen2">
</constructor-arg></bean>
<!-- 第三种根据参数类型设置 -->
<bean id="userT" class="com.kuang.pojo.UserT">
<constructor-arg type="java.lang.String" value="kuangshen2">
</constructor-arg></bean>
3、测试
@Test
public void testT(){
ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
UserT user = (UserT) context.getBean("userT");
user.show();
}
Original: https://www.cnblogs.com/b10100912/p/16655405.html
Author: 学习钱厚端的小白
Title: IOC常用的创建对象方式
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