对于Spring Boot +
Integration应用程序，我正在尝试从数据库中加载配置，允许Spring的Environment＆通过@Value注解可访问它，并且可以被外部配置覆盖，如Spring
Boot参考文档“ 外部化配置”中所述章节。

我遇到的问题是我的Spring Integration XML包含${input}无法解决的属性占位符，因为 在 Spring尝试加载XML配置
之前 ，我无法加载数据库支持的配置。

应用程序的入口点：

@SpringBootApplication
public class TestApplication {
   public static void main(String[] args) {
      SpringApplication.run(TestApplication.class, args);
   }
}

如何加载数据库配置：

 @Configuration
 public class DbPropertiesConfig {

    @Autowired
    private org.springframework.core.env.Environment env;

    @PostConstruct
    public void initializeDatabasePropertySourceUsage() {
        MutablePropertySources propertySources = ((ConfigurableEnvironment) env).getPropertySources();
       try {
          // The below code will be replace w/ code to load config from DB
          Map<String,Object> map = new HashMap<>();
          map.put("input-dir","target/input");
          map.put("output-dir","target/output");
          DbPropertySource dbPropertySource = new DbPropertySource("si",map);
          propertySources.addLast(dbPropertySource);
       } catch (Exception e) {
           throw new RuntimeException(e);
       }
    }
 }

Spring Integration配置如何加载：

 @Profile("IN")
 @Configuration
 @ImportResource({"si-common-context.xml","si-input-context.xml"})
 public class SiInputAppConfig {
 }

Spring Integration XML配置si-input-context.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/integration"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:int="http://www.springframework.org/schema/integration"
             xmlns:beans="http://www.springframework.org/schema/beans"
             xmlns:int-file="http://www.springframework.org/schema/integration/file"
             xsi:schemaLocation="http://www.springframework.org/schema/beans
                  http://www.springframework.org/schema/beans/spring-beans.xsd
                  http://www.springframework.org/schema/integration
                  http://www.springframework.org/schema/integration/spring-integration.xsd
                  http://www.springframework.org/schema/integration/file
                  http://www.springframework.org/schema/integration/file/spring-integration-file.xsd" default-lazy-init="true">


    <int-file:inbound-channel-adapter channel="input2" directory="${input-dir}" filename-pattern="*">
        <int:poller fixed-rate="500"/>
    </int-file:inbound-channel-adapter>

       <int:service-activator input-channel="input2" ref="sampleEndpoint" method="hello" output-channel="output2"/>

    <int:channel id="output2"/>

    <int-file:outbound-channel-adapter channel="output2" directory="${output-dir}"/>

</beans:beans>

我得到的错误：

2015-10-28 17:22:18.283  INFO 3816 --- [           main] o.s.b.f.xml.XmlBeanDefinitionReader      : Loading XML bean definitions from class path resource [si-common-context.xml]
2015-10-28 17:22:18.383  INFO 3816 --- [           main] o.s.b.f.xml.XmlBeanDefinitionReader      : Loading XML bean definitions from class path resource [si-mail-in-context.xml]
2015-10-28 17:22:18.466  INFO 3816 --- [           main] o.s.b.f.config.PropertiesFactoryBean     : Loading properties file from URL [jar:file:/C:/Users/xxx/.m2/repository/org/springframework/integration/spring-integration-core/4.1.6.RELEASE/spring-integration-core-4.1.6.RELEASE.jar!/META-INF/spring.integration.default.properties]
2015-10-28 17:22:18.471  INFO 3816 --- [           main] o.s.i.config.IntegrationRegistrar        : No bean named 'integrationHeaderChannelRegistry' has been explicitly defined. Therefore, a default DefaultHeaderChannelRegistry will be created.
2015-10-28 17:22:18.604  INFO 3816 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Overriding bean definition for bean 'beanNameViewResolver': replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; ...
2015-10-28 17:22:18.930  WARN 3816 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt

org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'org.springframework.integration.config.SourcePollingChannelAdapterFactoryBean#0.source' defined in null: Could not resolve placeholder 'si.in-input' in string value "${si.in-input}"; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'input-dir' in string value "${input-dir}" ...

尝试加载XML配置DbPropertiesConfig 后 ，将加载Spring 。

我该如何解决这个问题？

提前致谢

美联社