spring ioc 泛型保留
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2022-09-04 19:46:01
spring ioc 泛型保留 在上一篇中,说到spring中并不能自动注入泛型,如何生成泛型类型已经讲的很清楚了,在本篇着重讲在spring中如何自动注入。 环境 这里所有代码基于如下环境,如有出入请参考当前环境。 方法一 通过实现 和`org.springframework.beans.fact ......
spring ioc 泛型保留
在上一篇中,说到spring中并不能自动注入泛型,如何生成泛型类型已经讲的很清楚了,在本篇着重讲在spring中如何自动注入。
环境
这里所有代码基于如下环境,如有出入请参考当前环境。
java version "1.8.0_201" java(tm) se runtime environment (build 1.8.0_201-b09) java hotspot(tm) 64-bit server vm (build 25.201-b09, mixed mode)
implementation 'org.aspectj:aspectjweaver:1.9.2' implementation "org.springframework:spring-context:5.1.9.release" implementation 'org.javassist:javassist:3.25.0-ga'
方法一
通过实现org.springframework.beans.factory.support.beandefinitionregistrypostprocessor
和org.springframework.beans.factory.config.instantiationawarebeanpostprocessor
自定义bean泛型的注入
mainconfig.java
@configuration public class mainconfig { @bean public static mybeanfactorypostprocessor newmybeanfactorypostprocessor() { return new mybeanfactorypostprocessor(); } ....
mybeanfactorypostprocessor.java
public class mybeanfactorypostprocessor implements beandefinitionregistrypostprocessor { @override public void postprocessbeanfactory(configurablelistablebeanfactory beanfactory) throws beansexception { system.out.println("beanfactory=" + beanfactory); beanfactory.addbeanpostprocessor(new mybeanpostprocessor(beanfactory)); } ...
mybeanpostprocessor.java
public class mybeanpostprocessor implements instantiationawarebeanpostprocessor { public object postprocessbeforeinstantiation(class<?> beanclass, string beanname) throws beansexception { // system.out.println("创建类:" + beanclass); list<field> fields = new arraylist<>(); for (field field : beanclass.getdeclaredfields()) { if (field.getannotation(autowired.class) != null && myprovider.class.isassignablefrom(field.gettype())) { type type = field.getgenerictype(); if (type != null && type instanceof parameterizedtype) { fields.add(field); } } } if (!fields.isempty()) { //创建bean,请参考上一篇文章 .... } return null; } ...
输出结果如下:
beanfactory=org.springframework.beans.factory.support.defaultlistablebeanfactory@51081592: defining beans [org.springframework.context.annotation.internalconfigurationannotationprocessor,org.springframework.context.annotation.internalautowiredannotationprocessor,org.springframework.context.annotation.internalcommonannotationprocessor,org.springframework.context.event.internaleventlistenerprocessor,org.springframework.context.event.internaleventlistenerfactory,main,mainconfig,baseprovider,myaspect,testservice,testservice2,newmybeanfactorypostprocessor,newbeanconfig,org.springframework.aop.config.internalautoproxycreator]; root of factory hierarchy service=test.spring.service.testservice2@1817d444 superclass=test.spring.provider.myprovider<test.spring.model.user> userproviderfieldtype=[] resolvabletype=test.spring.service.testservice2
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