Java 如何使用@Autowired注解自动注入bean

Java 如何使用@Autowired注解自动注入bean

java @Autowired注解自动注入bean

annotationWire.xml （一定记得配置context:annotation-config/）

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:context="http://springframework.org/schema/context" xmlns:p="http://springframework.org/schema/p"

xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans.xsd http://springframework.org/schema/context https://springframework.org/schema/context/spring-context.xsd">

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:context="http://springframework.org/schema/context" xmlns:p="http://springframework.org/schema/p"

xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans.xsd http://springframework.org/schema/context https://springframework.org/schema/context/spring-context.xsd">

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.ApplijYTUdvoHcationContext;

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。

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