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。
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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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