如何在spring-boot应用程序中从YML文件加载多个属性

Question

我们有一个YML配置，如下所示：

datasurces: 
  readDataSource:
    ssl-enabled: false
    driver-class-name: oracle.jdbc.driver.OracleDriver
    host: db1.abc.com
    port: 1232
    sid: ABC_DB
    trust-store-fileName: abcdb.jks
    connection-pool:
      initial-size: 10
      max-size: 20

  writeDataSource:
    ssl-enabled: false
    driver-class-name: oracle.jdbc.driver.OracleDriver
    host: db2.abc.com
    port: 1232
    sid: XYZ_DB
    trust-store-fileName: xyzdb.jks
    connection-pool:
      initial-size: 10
      max-size: 20

我们必须将其加载到自定义类DataSources中，该类如下所示

@ConfigurationProperties(prefix = "datasources")
public class DataSources {
  @Value("${datasources.readDataSource}")
  private DataSource readDataSource;

  @Value("${datasources.writeDataSource}")
  private DataSource writeDataSource;

  //...getters/setters
}

public class DataSource {
  private String id;
  private boolean sslEnabled;
  private String driverClassName;
  private String host;
  private int port;
  private String trustStoreFileName;
  private ConnectionPool connectionPool;

  //...getters/setters  
}

public class ConnectionPool {
  private int initialSize;
  private int maxSize;

  //...getters/setters 
}

我的spring引导配置文件如下所示：

@Configuration
@ComponentScan(basePackages = {"com.abc"})
@EnableAspectJAutoProxy(proxyTargetClass = true)
@EnableConfigurationProperties(DataSources.class)
@Profile({"dev"})
public class TestAppConfiguration {

}

@EnableAutoConfiguration
@SpringBootApplication
@EnableConfigurationProperties(DataSources.class)
public class TestAppInitializer {
  @Autowired
  private DataSources dataSources;

  public static void main(final String[] args) {
    SpringApplication.run(TestAppInitializer.class, args);
  }
}

单元测试是：

@SpringApplicationConfiguration(classes = {TestAppInitializer.class})
@Test(groups = "categoryTests")
@ActiveProfiles("dev")
public class DataSourcesTest extends AbstractTestNGSpringContextTests {
  private static final AppLogger logger = LoggerUtil.getLogger(DataSourcesTest.class);

  @Autowired
  private DataSources dataSources;

  @Test
  public void printDetails() {
    logger.debug("DataSources --> {}", dataSources);
  }
}

结果不像预期的那样。

1. 当我从@Value类中删除DataSources时，属性readDataSource和writeDataSource都是null ( DataSources类本身不是null)。
2. 当我在@Value类中添加DataSources时，测试会异常失败。 由: java.lang.IllegalStateException:无法将java.lang.String类型的值转换为必需的类型com.abc.DataSource:没有找到匹配的编辑器或转换策略

感谢有人能提供一些如何处理这件事的想法。我想要的只是在像readDataSource这样的类中同时捕获DataSources和writeDataSource。

Answer 1

用@Configuration注释您的@Configuration类，然后创建两个用@ConfigurationProperties注释的@Bean方法。

@Configuration
public class DataSources {

    @Bean
    @ConfigurationProperties(prefix="datasources.readDataSource")
    public DataSource readDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean
    @ConfigurationProperties(prefix="datasources.writeDataSource")
    public DataSource writeDataSource() {
        return DataSourceBuilder.create().build();
    }
}

现在您有了两个数据源，它的属性绑定到创建的DataSource上，在中解释了这个机制。

如果您不需要DataSource，但是构造您自己的对象(尽管不确定为什么需要它)，也会出现同样的情况。