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  • spring @condition 注解

    spring @condition注解是用来在不同条件下注入不同实现的

    demo如下:

    package com.foreveross.service.weixin.test.condition;
    
    import org.springframework.context.annotation.Condition;
    import org.springframework.context.annotation.ConditionContext;
    import org.springframework.core.type.AnnotatedTypeMetadata;
    
    /**
     * 
     * windows下的环境
     *
     */
    public class WindowsCondition implements Condition{
    
        @Override
        public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
        
            return context.getEnvironment().getProperty("os.name").contains("Windows");
        }
    
        
    }
    package com.foreveross.service.weixin.test.condition;
    
    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");
        }
    
    }
    package com.foreveross.service.weixin.test.condition;
    
    public interface ListService {
        String showListCmd();
    }
    package com.foreveross.service.weixin.test.condition;
    
    import org.springframework.stereotype.Service;
    
    @Service
    public class LinuxService implements ListService {
    
        public String showListCmd(){
            return "ls";
        }
        
    }
    package com.foreveross.service.weixin.test.condition;
    
    import org.springframework.stereotype.Service;
    
    @Service
    public class WindowsService implements ListService{
    
        public String showListCmd(){
            return "dir";
        }
        
    }
    package com.foreveross.service.weixin.test.condition;
    
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Conditional;
    import org.springframework.context.annotation.Configuration;
    
    @Configuration
    public class MyConfiguration {
    
        @Bean(name = "service")
        @Conditional(WindowsCondition.class)
        public ListService windowsService() {
            return new WindowsService();
        }
    
        @Bean(name = "service")
        @Conditional(LinuxCondition.class)
        public ListService linuxEmailerService() {
            return new LinuxService();
        }
    }
    package com.foreveross.service.weixin.test.condition;
    
    import org.springframework.context.annotation.AnnotationConfigApplicationContext;
    
    public class Test {
    
        public static void main(String[] args) {
            
            AnnotationConfigApplicationContext context=new AnnotationConfigApplicationContext(MyConfiguration.class);
            
            ListService service= context.getBean(ListService.class);
            
            System.out.println("操作符为:"+service.showListCmd()+",系统为:"+context.getEnvironment().getProperty("os.name"));
            
            context.close();
        }
    }
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  • 原文地址:https://www.cnblogs.com/huzi007/p/6222289.html
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