Java 如何使用@Autowired注解自动注入bean
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2022-03-11 12:31:46
java @autowired注解自动注入beanannotationwire.xml （一定记得配置context:annotation-config/）
java @autowired注解自动注入bean
annotationwire.xml （一定记得配置context:annotation-config/）
<?xml version="1.0" encoding="utf-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xsi:schemalocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<context:annotation-config/>
<bean id="order" class="com.annotationwire.pojo.order" p:order="202020124546" />
<bean id="user" class="com.annotationwire.pojo.user" />
</beans>
user类
package com.annotationwire.pojo;
import lombok.data;
import org.springframework.beans.factory.annotation.autowired;
@data
public class user {
private string name;
@autowired
private order order;
}
order类
package com.annotationwire.pojo;
import lombok.data;
@data
public class order {
private string order;
}
测试类
package com.annotationwire;
import com.annotationwire.pojo.user;
import org.junit.test;
import org.springframework.context.applicationcontext;
import org.springframework.context.support.classpathxmlapplicationcontext;
public class testannotation {
@test
public void test(){
applicationcontext applicationcontext = new classpathxmlapplicationcontext("annotationwire.xml");
user student = applicationcontext.getbean(user.class);
system.out.println(student);
}
}
java配置spring，无法@autowired自动注入bean的问题
要在配置类上加上@componentscan
同时在rootconfigure和servletconfig两个类上scan的对象是不同的
servletconfig是用来注册dispatcherservlet的，它只是用来扫描controller层的
rootconfigure用来注册contextloaderlistener，他扫描的范围是除了controller以外的bean，例如dao，service，bean实体。
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。