springboot:condition

最新推荐文章于 2025-05-16 13:56:43 发布

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本文介绍了一个基于Spring框架的示例，展示了如何根据不同操作系统条件选择性地实例化特定的服务Bean。通过实现Condition接口并覆盖matches方法，可以判断当前运行的操作系统，并相应地创建Windows、Linux或Mac专属的Emailer服务。

public class LinuxCondition implements Condition{

@Override
public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
return context.getEnvironment().getProperty("os.name").contains("Linux"); }
}
=============================================
public class MacCondition implements Condition{

@Override
public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
return context.getEnvironment().getProperty("os.name").contains("Mac"); }
}
=============================================
public class WindowsCondition implements Condition{

@Override
public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
return context.getEnvironment().getProperty("os.name").contains("Windows");
}
}
=============================================
@Configuration
public class MyConfiguration {

@Bean(name="emailerService")
@Conditional(WindowsCondition.class)
public Object windowsEmailerService(){
return new Object();
}

@Bean(name="emailerService")
@Conditional(LinuxCondition.class)
public Object linuxEmailerService(){
return new Object();
}

@Bean(name="emailerService")
@Conditional(MacCondition.class)
public Object macEmailerService(){
return new Object();
}
}