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基于配置方式实现自定义条件装配

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本文主要讲通过配置方式来实现自定义条件装配

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

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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

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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

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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

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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

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  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: 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

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  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: 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