在非彈簧管理的 web 應用程序中向 spring 引導自動配置類注入屬性

Question

我使用 Spring Boot 創建了一個用作 kafka 客戶端的庫，基本上庫中只有類，每個類都使用@SpringBootConfiguration和@EnableAutoConfiguration注釋進行注釋。

@Slf4j
@SpringBootConfiguration
@EnableAutoConfiguration
public class KafkaHandlerConfiguration {
...
}

和

@Service
interface SwiftalkKafkaGateway {
...
}

我創建了一個 jar 及其依賴項，這個 JAR 將通過 CDI 在 Java EE webapp 中使用。 我將通過此代碼在 CDI 上下文中獲取 bean

@Singleton
@ApplicationScoped
class SwiftalkAnnotatedSpringContextLoader {

    private final AnnotationConfigApplicationContext springContext;

    SwiftalkAnnotatedSpringContextLoader() {
        springContext = new AnnotationConfigApplicationContext();
        springContext.scan("com.digite.cloud.swiftalk");
        springContext.refresh();
    }

    ApplicationContext getSwiftalkKafkaClientContext() {
        return this.springContext;
    }

}

如何傳遞 Spring 引導自動配置需要啟動 bean 的屬性？ 我有spring.kafka屬性組和自定義屬性，它們通過@Value中的KafkaHandlerConfiguration注釋注入

@Value("${digite.swiftalk.kafka.executor.core-pool-size:10}")
private Integer corePoolSize;

@Value("${digite.swiftalk.kafka.executor.max-pool-size:20}")
private Integer maxPoolSize;

@Value("${digite.swiftalk.kafka.executor.queue-capacity:100}")
private Integer queueCapacity;

和

    "spring.kafka.producer.properties.max.block.ms=1000",
    "spring.kafka.producer.bootstrap-servers=localhost:9999",
    "spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer",
    "spring.kafka.producer.value-serializer=org.springframework.kafka.support.serializer.JsonSerializer",

Answer 1

使用ConfigurableEnvironment和MutablePropertySource對我有用； 這是我將環境加載到上下文中的方式

@Singleton
@ApplicationScoped
class SwiftalkAnnotatedSpringContextLoader {

    private final AnnotationConfigApplicationContext springContext;

    SwiftalkAnnotatedSpringContextLoader() throws IOException {
        springContext = new AnnotationConfigApplicationContext();
        ConfigurableEnvironment environment = new StandardEnvironment();
        MutablePropertySources propertySources = environment.getPropertySources();
        Properties appProps = new Properties();
        appProps.load(this.getClass().getClassLoader().getResourceAsStream("spring-config.properties"));
        propertySources.addFirst(new PropertySource<Properties>("spring-properties", appProps) {
            @Override
            public Object getProperty(String name) {
                return appProps.getProperty(name);
            }
        });
        springContext.setEnvironment(environment);
        springContext.scan("com.digite.cloud.swiftalk");
        springContext.refresh();
    }

    ApplicationContext getSwiftalkKafkaClientContext() {
        return this.springContext;
    }

}

在src/test/resources中添加了一個文件

spring.data.mongodb.database=embedded
spring.data.mongodb.port=12345
spring.data.mongodb.host=localhost
spring.kafka.producer.properties.max.block.ms=2000
spring.kafka.producer.bootstrap-servers=localhost:19092
spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.value-serializer=org.springframework.kafka.support.serializer.JsonSerializer
digite.swiftalk.kafka.upstream-type-header=UPSTREAM-TYPE
digite.swiftalk.kafka.upstream-instance-header=INSTANCE-HEADER
digite.swiftalk.kafka.message-key-header=MESSAGE-KEY-HEADER
digite.swiftalk.kafka.executor.core-pool-size=20
digite.swiftalk.kafka.executor.max-pool-size=50
digite.swiftalk.kafka.executor.queue-capacity=1000

和測試

@Test
void testLoadsSpringApplicationContext() throws IOException {
    SwiftalkAnnotatedSpringContextLoader loader = new SwiftalkAnnotatedSpringContextLoader();
    SwiftalkKafkaGateway kafkaGateway = loader.getSwiftalkKafkaClientContext().getBean(SwiftalkKafkaGateway.class);
    assertNotNull(kafkaGateway);

    ThreadPoolTaskExecutor asyncExecutor = loader.getSwiftalkKafkaClientContext().getBean(
            ThreadPoolTaskExecutor.class);
    Assertions.assertTrue(asyncExecutor.getCorePoolSize() == 20);
}

在 spring 引導庫中corePoolSize的默認值為 10

@Value("${digite.swiftalk.kafka.executor.core-pool-size:10}")
private Integer corePoolSize;