springboot 中@Conditional注解如何使用

这篇文章给大家介绍springboot 中@Conditional注解如何使用，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。

启动类

package com.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * Hello world!
 *
 */
@SpringBootApplication
public class App
{
    public static void main( String[] args )
    {
        SpringApplication.run(App.class,args);
    }
}

1.实现condition接口

package com.demo.condition;

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 conditionContext, AnnotatedTypeMetadata annotatedTypeMetadata) {
        String property = conditionContext.getEnvironment().getProperty("os.name");

        return property.contains("Window");
    }
}

package com.demo.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 conditionContext, AnnotatedTypeMetadata annotatedTypeMetadata) {
        String property = conditionContext.getEnvironment().getProperty("os.name");
        return property.contains("Linux");
    }
}

配置bean对象

package com.demo.config;

import com.demo.condition.LinuxCondition;
import com.demo.condition.WindowsCondition;
import com.demo.serviceI.DemoService;
import com.demo.serviceImp.DemoServiceLinuxImp;
import com.demo.serviceImp.DemoServiceWindowImp;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Conditional;
import org.springframework.context.annotation.Configuration;

@Configuration
public class OSconfig {

    @Bean
    @Conditional(LinuxCondition.class)
    public DemoService linuxCondition(){
        return new DemoServiceLinuxImp();
    }

    @Bean
    @Conditional(WindowsCondition.class)
    public DemoService winCondition(){
        return new DemoServiceWindowImp();
    }


}

服务接口 

package com.demo.serviceI;

public interface DemoService {

    String info();

}

服务接口实现

package com.demo.serviceImp;

import com.demo.serviceI.DemoService;


public class DemoServiceLinuxImp implements DemoService {

    @Override
    public String info() {

        return "linux";
    }
}

package com.demo.serviceImp;

import com.demo.serviceI.DemoService;


public class DemoServiceWindowImp implements DemoService {

    @Override
    public String info() {

        return "window";
    }
}

控制层按类型注入

package com.demo.action;

import com.demo.serviceI.DemoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class DemoAction {

    @Autowired
    private DemoService demoService;

    @RequestMapping(value = "health.json")
    public String healt(){

        return "{\"status\":\"UP\",\"diskSpace\":{\"status\":\"UP\",\"total\":249769230336,\"free\":71914618880,\"threshold\":10485760},\"db\":{\"status\":\"UP\",\"database\":\"MySQL\",\"hello\":1}}";
    }

    @RequestMapping(value = "user/info")
    public String info(){

        return demoService.info();
    }

}

访问接口

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