使用@Component和@Autowired时的Spring bean基本属性? [英] Spring bean primitive properties when using @Component and @Autowired?

问题描述

如何为bean的原始属性设置值?

How to set value for primitive properties of a bean?

因为我们有@Component批注，而且@Autowired批注也用于绑定实例依赖项，所以原始属性呢?

Since we have @Component annotation and also @Autowired annotation also is for binding instance dependencies, so what about primitive properties?

@Component
class Person{
@Autowired
Address address;

int age /// what about this one?
}

推荐答案

对于基元，可以使用@Value批注.通常的情况是让PropertyPlaceholderConfigurer从属性文件中加载值，然后让@Value("${property.key}")

For primitives you can use the @Value annotation. The usual scenario is to have a PropertyPlaceholderConfigurer which has loaded the values from a properties file, and then have @Value("${property.key}")

您还可以将值定义为bean，这是比较古老的:

You can also define your values as beans, which is more old-school:

<bean id="foo" class="java.lang.Integer" factory-method="valueOf">
    <constructor-arg value="20" />
</bean>

然后

@Autowired
@Qualifier("foo")
private int foo;

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