PropertySourcesPlaceholderConfigurer和SPEL？

Question

由于我们相当复杂的properties-file设置，我们不能简单地使用@propertysource。

connection.http.connectTimeout=15000
#connection.http.readTimeout=${connection.http.connectTimeout}
connection.http.readTimeout=#{30*1000}

@Component
@ConfigurationProperties("connection")
public class ConnectionConfig {

  @NestedConfigurationProperty
  private ConnectionSourceConfig http;

  public ConnectionSourceConfig getHttp() {
    return http;
  }

  public void setHttp(ConnectionSourceConfig http) {
    this.http = http;
  }

}

public class ConnectionSourceConfig {

  private long connectTimeout;

  private long readTimeout;

  public long getConnectTimeout() {
    return connectTimeout;
  }

  public void setConnectTimeout(long connectTimeout) {
    this.connectTimeout = connectTimeout;
  }

  public long getReadTimeout() {
    return readTimeout;
  }

  public void setReadTimeout(long readTimeout) {
    this.readTimeout = readTimeout;
  }

}

@Configuration
public class BaseAppConfig {

  @Bean
  public static PropertySourcesPlaceholderConfigurer properties(Environment environment) throws IOException {
    String env = getEnvProperty(environment);
    PropertySourcesPlaceholderConfigurer configurer = new PropertySourcesPlaceholderConfigurer();
    configurer.setLocations(getPropertiesFiles(env));
    configurer.setIgnoreResourceNotFound(true);
    return configurer;
  }

    PropertySourcesPlaceholderConfigurer configurer = new PropertySourcesPlaceholderConfigurer() {

      @Override
      protected String convertPropertyValue(String originalValue) {
        System.out.println("Parse " + originalValue);
        return super.convertPropertyValue(originalValue);
      }

    };

但是，也许我在Spring的处理生命周期上犯了一个错误...

Answer 1

属性文件中，#被认为是一个注释块。这样做，您的属性文件最终将一个属性设置为空。

connection.http.readtimeout=#{30*1000}呈现为connection.http.readtimeout=，因为#之后的所有内容都被忽略。