當(dāng)配置類中只有一個(gè)該類型Bean時(shí)，在注入的時(shí)候。其名字隨意。例如：

@Configuration
public class ComputerConfig {

    @Bean
    public Computer computer() {
        Computer computer = new Computer();
        computer.setId(1);
        computer.setType("筆記本");
        computer.setName("戴爾筆記本");
        return computer;
    }
}

注入時(shí):

    @Resource
    private Computer dell;

當(dāng)配置類中有多個(gè)該類型的Bean時(shí)，名字不能相同，并且注入時(shí)也要按照Bean的名稱來注入。例如:

@Configuration
public class ComputerConfig {

    @Bean
    public Computer dell() {
        Computer computer = new Computer();
        computer.setId(1);
        computer.setType("筆記本");
        computer.setName("戴爾筆記本");
        return computer;
    }

    @Bean
    public Computer apple() {
        Computer computer = new Computer();
        computer.setId(2);
        computer.setType("筆記本");
        computer.setName("蘋果筆記本");
        return computer;
    }

    @Bean("hp")
    public Computer huipu() {
        Computer computer = new Computer();
        computer.setId(3);
        computer.setType("筆記本");
        computer.setName("惠普筆記本");
        return computer;
    }
}

注入:

    @Resource
    private Computer dell;

    @Resource
    private Computer apple;

    @Resource
    private Computer hp;