Spring中将BeanDefinition注册到IOC容器中
Spring中将BeanDefinition注册到IOC容器中
-
XML配置元信息
- <bean name=”...” ... />
-
注解:
- @Bean,@Component,@Import
-
命名:
- BeanDefinitionRegistry#registerBeanDefition
-
非命名
- BeanDefinitionReaderUtils#registerWithGeneratedName
- AnnotatedBeanDefinitionReader#register
RumenzA
package com.rumenz;
public class RumenzA {
private String id;
private String name;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "RumenzA{" +
"id='" + id + '/'' +
", name='" + name + '/'' +
'}';
}
public RumenzA() {
System.out.println("RumenzA 无参构造方法");
}
}
XMl配置元信息
<bean id="rumena" class="com.rumenz.RumenzA"/>
@Bean,@Component,@Import 注解
package com.rumenz;
@Import(DemoApplication.Config.class)
public class DemoApplication {
public static void main(String[] args) {
AnnotationConfigApplicationContext ac=new AnnotationConfigApplicationContext();
ac.register(DemoApplication.class);
ac.refresh();
System.out.println("RumenzA类"+ac.getBeansOfType(RumenzA.class));
System.out.println("Config类"+ac.getBeansOfType(Config.class));
System.out.println("DemoApplication类"+ac.getBeansOfType(DemoApplication.class));
ac.close();
}
@Component
public static class Config{
@Bean
public RumenzA rumenza(){
RumenzA r=new RumenzA();
r.setId("1");
r.setName("入门小站");
return r;
}
}
}
BeanDefinitionRegistry#registerBeanDefinition
BeanDefinitionReaderUtils#registerWithGeneratedName
package com.rumenz;
@Import(DemoApplication.Config.class) //1.注解方式
public class DemoApplication {
public static void main(String[] args) {
AnnotationConfigApplicationContext ac=new AnnotationConfigApplicationContext();
//ac.register(DemoApplication.class); //1.注解方式
// 2.BeanDefinitionReaderUtils#registerWithGeneratedName,BeanDefinitionRegistry#registerBeanDefinition
registryBeanDefinition(ac,"rumenz");
registryBeanDefinition(ac,null);
ac.refresh();
System.out.println("RumenzA类"+ac.getBeansOfType(RumenzA.class));
ac.close();
}
private static void registryBeanDefinition(BeanDefinitionRegistry reg,String beanName){
BeanDefinitionBuilder builder= BeanDefinitionBuilder.genericBeanDefinition(RumenzA.class);
builder.addPropertyValue("id","1").addPropertyValue("name","入门小站");
if(StringUtils.isEmpty(beanName)){ //非命名
BeanDefinitionReaderUtils.registerWithGeneratedName(builder.getBeanDefinition(),reg);
}else{
//命名
reg.registerBeanDefinition(beanName,builder.getBeanDefinition());
}
}
@Component //1.注解方式
public static class Config{
@Bean //1.注解方式
public RumenzA rumenza(){
RumenzA r=new RumenzA();
r.setId("1");
r.setName("入门小站");
return r;
}
}
}
AnnotatedBeanDefinitionReader#register
- register -->>this.reader.register
- this.reader -->>private final AnnotatedBeanDefinitionReader reader;
AnnotationConfigApplicationContext ac=new AnnotationConfigApplicationContext(); ac.register(DemoApplication.class);
源码: https://github.com/mifunc/Spr...
原文: https://rumenz.com/rumenbiji/Spring-registerBeanDefinition.html
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