獅哥哥 三日不寫Code面目可憎

1.建立一個domain物件

package com.liongogo.domain;

public class SuperHero {

    public SuperHero(String id){
        this.setId(id);
    }
    private String id;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
}

2.建立一隻@Configuration

package com.liongogo.configuration;

import com.liongogo.domain.SuperHero;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MyConfig {

    @Bean("MyBatman")
    public SuperHero createBatman(){
        return new SuperHero("Batman");
    }

    @Bean("MyGreenArrow")
    public SuperHero createGreenArrow(){
        return new SuperHero("GreenArrow");
    }
}

3.建立一隻SpringContextUtil用來取得Bean

package com.liongogo.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

import java.util.Map;

@Component
public class SpringContextUtil implements ApplicationContextAware {

    private static ApplicationContext context = null;

    public SpringContextUtil() {
        super();
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        context = applicationContext;
    }

    public static Object getBean(String beanName) {
        return context.getBean(beanName);
    }

    public static <T> T getBean(String beanName, Class<T> clazz) {
        return context.getBean(beanName, clazz);
    }

}

4.取得Bean

package com.liongogo.controller;

import com.liongogo.domain.SuperHero;
import com.liongogo.util.SpringContextUtil;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String hello() {

        SuperHero tGreenArrow = SpringContextUtil.getBean("MyGreenArrow", SuperHero.class);
        SuperHero tBatman = SpringContextUtil.getBean("MyBatman", SuperHero.class);

        return "Hello "+tGreenArrow.getId()+"、"+tBatman.getId();
    }
}

5.執行結果