Java 依赖注入的问题
我正在尝试使用属性设置器进行依赖项注入的基本示例。但是我得到了以下编译时错误Java 依赖注入的问题,java,spring,spring-mvc,dependency-injection,Java,Spring,Spring Mvc,Dependency Injection,我正在尝试使用属性设置器进行依赖项注入的基本示例。但是我得到了以下编译时错误 The method communicate() is undefined for the type Communication 我找不到问题所在。谁能帮我一下,我哪里做错了 我的代码如下: POJO类 package com.websystique.spring.domain.Encryption; import com.websystique.spring.domain.Massaging; public cl
The method communicate() is undefined for the type Communication
我找不到问题所在。谁能帮我一下,我哪里做错了
我的代码如下:
POJO类
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;
}
}
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
}
}
接口
package com.websystique.spring.domain;
public interface Massaging {
public void sendMessage();
}
<?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>
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");
}
}
主类
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;
}
}
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
package com.websystique.spring.domain;
public interface Massaging {
public void sendMessage();
}
<?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,项目解剖图是这样的
因为您没有在
Communication.java中定义Communication()
以下代码将修复编译问题
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
}
}
是什么让您认为Communication
bean有一个Communication()
方法?