依赖注入问题

Question

我正在尝试使用属性设置器进行依赖注入的基本示例。但是我收到了以下编译时错误。

The method communicate() is undefined for the type Communication

我发现了这个问题。任何人都可以帮助我，我在哪里做错了。

我的代码如下，

POJO班级

package com.websystique.spring.domain.Encryption;
import com.websystique.spring.domain.Massaging;

public class Communication {

    private Massaging messaging;

    public Massaging getMessaging() {
        return messaging;
    }

    public void setMessaging(Massaging messaging) {
        this.messaging = messaging;
    }
}

接口

package com.websystique.spring.domain;

public interface Massaging {
    public void sendMessage();
}

实施

package com.websystique.spring.domain.impl;
import com.websystique.spring.domain.Massaging;

public class ActiveMQMessaging implements Massaging{
    public void sendMessage() {
        System.out.println("Sending Message via Active MQ");
    }
}

主要课程

package com.websystique.spring;

import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.websystique.spring.domain.Encryption.Communication;

public class AppMain {

    public static void main(String args[]){
        AbstractApplicationContext context = new ClassPathXmlApplicationContext("app-config.xml");
        Communication app = (Communication)context.getBean("communication");
        app.communicate(); // Getting error here
    }
}

配置文件

<?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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
                            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

    <bean id="activeMqMessaging" class="com.websystique.spring.domain.impl.ActiveMQMessaging" />

    <bean id="communication" class="com.websystique.spring.domain.Encryption.Communication">
        <property name="messaging">
            <ref bean="activeMqMessaging" />
        </property>
    </bean>

</beans>

最后，项目解剖结构看起来像这样，

Answer 1

因为您没有在communicate()

中定义Communication.java

以下代码将解决您的编译问题。

public class Communication {

    private Massaging messaging;

    public Massaging getMessaging() {
        return messaging;
    }

    public void setMessaging(Massaging messaging) {
        this.messaging = messaging;
    }

    public void communicate() {
        // TODO Auto-generated method stub
    }
}