配置Bean注意事项

当配置类中只有一个该类型Bean时，在注入的时候。其名字随意。例如：

@Configuration
public class ComputerConfig {

    @Bean
    public Computer computer() {
        Computer computer = new Computer();
        computer.setId(1);
        computer.setType("笔记本");
        computer.setName("戴尔笔记本");
        return computer;
    }
}

注入时:

    @Resource
    private Computer dell;

当配置类中有多个该类型的Bean时，名字不能相同，并且注入时也要按照Bean的名称来注入。例如:

@Configuration
public class ComputerConfig {

    @Bean
    public Computer dell() {
        Computer computer = new Computer();
        computer.setId(1);
        computer.setType("笔记本");
        computer.setName("戴尔笔记本");
        return computer;
    }

    @Bean
    public Computer apple() {
        Computer computer = new Computer();
        computer.setId(2);
        computer.setType("笔记本");
        computer.setName("苹果笔记本");
        return computer;
    }

    @Bean("hp")
    public Computer huipu() {
        Computer computer = new Computer();
        computer.setId(3);
        computer.setType("笔记本");
        computer.setName("惠普笔记本");
        return computer;
    }
}

注入:

    @Resource
    private Computer dell;

    @Resource
    private Computer apple;

    @Resource
    private Computer hp;