java - 通过注解进行依赖注入(inject)

Question

我是 spring 的新用户。我正在尝试通过注释来实现依赖注入(inject)。我的 beans.xml 是:-

<!-- Add your classes base package here -->          
<context:component-scan base-package="com.springaction.chapter01"/>

<bean id="greeting" class="com.springaction.chapter01.GreetingImpl">
    <property name="greeting">
        <value>Naveen Jakad</value>
    </property>
</bean> 

我要注入(inject)的bean是:-

package com.springaction.chapter01;

import org.springframework.stereotype.Service;

@Service
public class InjectBean {

private int id;
private String name;

public InjectBean() {
    super();
}
//setter getter of above instance variables..
}

我想在上面注入(inject)的 bean 是:-

package com.springaction.chapter01;

import org.springframework.beans.factory.annotation.Autowired;

public class GreetingImpl implements Greeting {

private String greeting;

@Autowired
private InjectBean myBean;

public GreetingImpl() {
    super();
}
public GreetingImpl(String greeting) {
    super();
    this.greeting = greeting;
}

public void setGreeting(String greeting) {
    this.greeting = greeting;
}

@Override
public void sayGreeting() {
    System.out.println(greeting + " " + myBean);
}
}

所以当我通过以下方式测试上述代码时:-

BeanFactory beanFactory = new XmlBeanFactory(new ClassPathResource("config.xml"));
        Greeting greeting = (Greeting)beanFactory.getBean("greeting");
        greeting.sayGreeting();

我得到输出“Naveen Jakad null”，简而言之，这意味着我无法实现我的目标。所以请帮助我并让我知道我在哪里犯了错误

Answer 1

如果你想通过@Autowired注入(inject)，你不需要在xml中配置它:)

您需要设置

<mvc:annotation-driven />
<context:component-scan base-package="com.your.base.package" />

这样 spring 就会知道检查注释