基于配置方式实现自定义条件装配

柔情只为你懂 2021-11-15 13:46 298阅读 0赞

> 本文主要讲通过配置方式来实现自定义条件装配 —— `@Profile`

### 我们尝试使用Profile实现两个计算服务，分别是Java7的for循环以及Java8的lambda表达式 ###

--------------------

#### 首先我们先新建一个计算服务接口 ####

`CalculateService.java`

package xyz.suiwo.diveinspringboot.service;
    
    /** * @author suiwo * @title: CalculateService * @date 2019-06-06 13:55 */
    public interface CalculateService { 
    
        /** * sum求和 * @param values 多个整数 * @return */
        Integer sum(Integer... values);
    }

--------------------

#### 添加两种方式的实现类 ####

`Java7CalculateService.java`

package xyz.suiwo.diveinspringboot.service;
    
    import org.springframework.context.annotation.Profile;
    import org.springframework.stereotype.Service;
    
    /** * @author suiwo * @title: Java7CalculateService * @date 2019-06-06 13:56 */
    @Service
    @Profile("Java7")
    public class Java7CalculateService implements CalculateService{ 
    
        @Override
        public Integer sum(Integer... values) { 
            System.out.println("Java7实现");
            int sum = 0;
            for(int i : values){ 
                sum += i;
            }
            return sum;
        }
    
        public static void main(String[] args) { 
            CalculateService calculateService = new Java7CalculateService();
            System.out.println(calculateService.sum(1,2,3,4,5,6,7,8,9,10));
        }
    }

`Java8CalculateService.java`

package xyz.suiwo.diveinspringboot.service;
    
    import org.springframework.context.annotation.Profile;
    import org.springframework.stereotype.Service;
    
    import java.util.stream.Stream;
    
    /** * @author suiwo * @title: Java8CalculateService * @date 2019-06-06 13:58 */
    @Service
    @Profile("Java8")
    public class Java8CalculateService implements CalculateService { 
        @Override
        public Integer sum(Integer... values) { 
            System.out.println("Java8实现");
            int sum = Stream.of(values).reduce(0,Integer::sum);
            return sum;
        }
    
        public static void main(String[] args) { 
            CalculateService calculateService = new Java7CalculateService();
            System.out.println(calculateService.sum(1,2,3,4,5,6,7,8,9,10));
        }
    }

--------------------

#### 下面我们来添加启动类 ####

`CalculateServiceBootstrap`

package xyz.suiwo.diveinspringboot.bootstrap;
    
    import org.springframework.boot.WebApplicationType;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.builder.SpringApplicationBuilder;
    import org.springframework.context.ConfigurableApplicationContext;
    import xyz.suiwo.diveinspringboot.service.CalculateService;
    
    /** * @author suiwo * @title: CalculateServiceBootstrap * @date 2019-06-06 14:01 */
    @SpringBootApplication(scanBasePackages = "xyz.suiwo.diveinspringboot.service")
    public class CalculateServiceBootstrap { 
    
        public static void main(String[] args) { 
            ConfigurableApplicationContext context =
                    new SpringApplicationBuilder(CalculateServiceBootstrap.class)
                            .web(WebApplicationType.NONE)
                            .profiles("Java8")
                            .run(args);
    
            CalculateService calculateService = context
                    .getBean(CalculateService.class);
    
            System.out.println("sum:" + calculateService.sum(1,2,3,4,5,6,7,8,9,10));
    
            //关闭上下文
            context.close();
        }
    }

> 此时终端打印结果如下

.   ____          _            __ _ _
     /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
    ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
     \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
      '  |____| .__|_| |_|_| |_\__, | / / / /
     =========|_|==============|___/=/_/_/_/
     :: Spring Boot ::        (v2.1.5.RELEASE)
    
    2019-06-14 11:09:17.221  INFO 30420 --- [           main] x.s.d.b.CalculateServiceBootstrap        : Starting CalculateServiceBootstrap on XXX with PID 30434 (/Users/dive-in-spring-boot/target/classes started by XXX in /Users/dive-in-spring-boot)
    2019-06-14 11:09:17.228  INFO 30420 --- [           main] x.s.d.b.CalculateServiceBootstrap        : The following profiles are active: Java8
    2019-06-14 11:09:20.062  INFO 30420 --- [           main] x.s.d.b.CalculateServiceBootstrap        : Started CalculateServiceBootstrap in 3.416 seconds (JVM running for 4.569)
    Java8实现
    sum:55
    
    Process finished with exit code 0

> 若将`profile`改成`Java7`，则终端结果为

.   ____          _            __ _ _
     /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
    ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
     \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
      '  |____| .__|_| |_|_| |_\__, | / / / /
     =========|_|==============|___/=/_/_/_/
     :: Spring Boot ::        (v2.1.5.RELEASE)
    
    2019-06-14 11:10:17.847  INFO 30434 --- [           main] x.s.d.b.CalculateServiceBootstrap        : Starting CalculateServiceBootstrap on XXX with PID 30434 (/Users/dive-in-spring-boot/target/classes started by XXX in /Users/dive-in-spring-boot)
    2019-06-14 11:10:17.851  INFO 30434 --- [           main] x.s.d.b.CalculateServiceBootstrap        : The following profiles are active: Java7
    2019-06-14 11:10:20.149  INFO 30434 --- [           main] x.s.d.b.CalculateServiceBootstrap        : Started CalculateServiceBootstrap in 2.822 seconds (JVM running for 3.95)
    Java7实现
    sum:55