Java 如何使用@Autowired注解自动注入bean
程序员文章站
2022-06-25 23:10:13
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。
上一篇: 台式电脑开机后屏幕没显示怎么解决?
下一篇: 笑眼观世,世事皆幽默