예제 4-28 자바 구성 클래스로 FactoryBean 구성([[factory-bean]] MessageDigesterConfigDemo.java)

package com.apress.prospring5.ch4.config;

import com.apress.prospring5.ch4.MessageDigestFactoryBean;
import com.apress.prospring5.ch4.MessageDigester;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.GenericApplicationContext;

public class MessageDigesterConfigDemo {
    @Configuration
    static class MessageDigesterConfig {

        @Bean
        public MessageDigestFactoryBean shaDigest() {
            MessageDigestFactoryBean factoryOne = 
                new MessageDigestFactoryBean();
            factoryOne.setAlgorithmName("SHA1");
            return factoryOne;
        }

        @Bean
        public MessageDigestFactoryBean defaultDigest() {
            return new MessageDigestFactoryBean();
        }

        @Bean MessageDigester digester() throws Exception {
            MessageDigester messageDigester = new MessageDigester();
            messageDigester.setDigest1(shaDigest().getObject());
            messageDigester.setDigest2(defaultDigest().getObject());
            return messageDigester;
        }
    }

    public static void main(String... args) {
        GenericApplicationContext ctx = 
            new AnnotationConfigApplicationContext(MessageDigesterConfig.class);

        MessageDigester digester = (MessageDigester) ctx.getBean("digester");
        digester.digest("Hello World!");
        ctx.close();
    }
}

 

이 클래스를 실행하면 앞 예제와 같은 결과가 출력됩니다.