java - 未定义任何命名的Bean

包com.mkyong.output;
IOutputGenerator.java

public interface IOutputGenerator
{
    public void generateOutput();
}

包com.mkyong.output;
OutputHelper.java

@Component
public class OutputHelper {

    @Autowired
    IOutputGenerator outputGenerator;

    public void generateOutput() {
        outputGenerator.generateOutput();
    }

    /*//DI via setter method
    public void setOutputGenerator(IOutputGenerator outputGenerator) {
        this.outputGenerator = outputGenerator;
    }*/
}

包com.mkyong.output.impl;

CsvOutputGenerator.java

@Component
public class CsvOutputGenerator implements IOutputGenerator {
    public void generateOutput() {
        System.out.println("This is Csv Output Generator");
    }
}

SpringBeans.xml

<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-2.5.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-2.5.xsd">

    <context:component-scan base-package="com.mkyong" />

</beans>

我收到此异常线程“主”中的异常org.springframework.beans.factory.NoSuchBeanDefinitionException：未定义名为“ OutputHelper”的bean

即使我已将OutputHelper标记为组件。

最佳答案

我变了

OutputHelper output = (OutputHelper) context.getBean("OutputHelper");

至

OutputHelper output = (OutputHelper) context.getBean("outputHelper");

而且有效。