Spring 使用 @Conditional 在不同系统下输出不同命令

//判断Windows的条件

package test;

import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.type.AnnotatedTypeMetadata;

public class WindowsCondition implements Condition {

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

//判断Linux的条件

package test;

import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.type.AnnotatedTypeMetadata;

public class LinuxCondition implements Condition {

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

//接口

package test;

public interface ListService {
    public String showListCmd();
}
​

//Windows下所要创建的Bean的类

package test;

import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.type.AnnotatedTypeMetadata;

public class WindowsCondition implements Condition {

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

//Linux下所要创建的Bean的类

package test;

public class LinuxListService implements ListService {

    @Override
    public String showListCmd() {
        return "ls";
    }
}
​

//配置类

package test;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Conditional;
import org.springframework.context.annotation.Configuration;

@Configuration
public class ConditionConfig {

    @Bean
    @Conditional(WindowsCondition.class)
    public ListService windowsListService() {
        return new WindowsListService();
    }

    @Bean
    @Conditional(LinuxCondition.class)
    public ListService linuxListService() {
        return new LinuxListService();
    }
}
​

//运行

package test;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Application {

    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ConditionConfig.class);

        ListService listService = context.getBean(ListService.class);
        System.out.println(context.getEnvironment().getProperty("os.name") + "系统下的列表命令为：" + listService.showListCmd());
    }
}
​