【Spring注解】@Condition条件注册

@Condition条件注册

@Condition来指定一定条件下注册组件对像

All Conditions that must match in order for the component to be registered.

所有的条件必须实现Condition接口，重写matches方法，来决定组件是否注册

配置类

@Configuration
public class ConditionConfig {
    @Conditional(WindowsCondition.class)
    @Bean("bill")
    public Person bill(){
        return new Person("bill",10);
    }

    @Conditional(LinuxCondition.class)
    @Bean("Linus")
    public Person person(){
        return new Person("Linus",10);
    }
}

WindowsCondition 判断windows环境

public class WindowsCondition implements Condition {
    public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
        //获取当前运行环境信息
        Environment environment = context.getEnvironment();
        //获取当前环境名称
        String osName = environment.getProperty("os.name");
        return osName.contains("Windows");
    }
}

LinuxCondition 判断Linux环境

public class LinuxCondition implements Condition {
    public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
        //获取当前运行环境信息
        Environment environment = context.getEnvironment();
        //获取当前环境名称
        String osName = environment.getProperty("os.name");
        return osName.contains("Linux");
    }
}

测试（系统为Window 7）

@Test
public void person() {
    Map<String, Person> beansOfType = annotationConfigApplicationContext.getBeansOfType(Person.class);
    System.out.println("beansOfType = " + beansOfType);
}

设置vm的变量来模拟Linux环境，Run Configurations->VM options

添加 Dos.name=Linux

运行结果

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更多参考：https://www.cnblogs.com/mayang2465/p/12019396.html
原文链接：https://blog.csdn.net/qq_27470131/article/details/79538046