Spring Boot Application.Properties值未填充且未读取

Question

但是，当我运行使用maven从命令行生成的jar时，它不会读取application.properties，默认情况下，tomcat是在8080上启动的，我无法识别上下文。其他的一切都很好。

在eclipse中，我将：VM参数提供为:-dext.prop.dir=e:/res/-dlog.name=d:/res/logback.xml

我文章和问题看起来很相似，我已经引用了这篇文章，只有我引用了Application.Properteis来配置spring boot应用程序的自定义上下文和端口。我也引用了这个链接，但我无法弄清楚当我从命令行运行jar时问题是什么。

相同的vm参数如下所示：

java -Dext.prop.dir=D:/res/ -jar com.drd.db.services-1.0.0.M1-jar-with-dependencies.jar 

并且我将application.properteis保存为d：/res/application.properteis。

下面是我的应用程序启动类和application.properties。

   package com.drd.application.configuration;
    import static com.drd.db.service.util.ServicesConstants.EXT_PROP_DIR;
    import static com.drd.db.service.util.ServicesConstants.LOG_BACK_XML_SYSTEM_PROPERTY;

    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
    import org.springframework.boot.context.embedded.EmbeddedServletContainerFactory;
    import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.ComponentScan;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.PropertySource;
    import org.springframework.util.StringUtils;

    import com.drd.db.service.util.ServicesConstants;

    @ComponentScan(basePackages = { "com.drd.db" })
    @Configuration
    @PropertySource({"file:///${ext.prop.dir}application.properties"/*, "classpath:application.properties"*/})
    @EnableAutoConfiguration
    public class ApplicationRunner {


        private static final Logger LOG = LoggerFactory.getLogger(ApplicationRunner.class);

        public static void main(String[] args) throws Exception {
            String extPropDir=System.getProperty(EXT_PROP_DIR);
            if(StringUtils.isEmpty(extPropDir)){
                LOG.warn("Could not resolve  PropertyvSource placeholder 'ext.prop.dir' in string value file:///${ext.prop.dire}application.properties");
                LOG.warn("Could not finnd {} System property Please specify valid path for it ",ServicesConstants.EXT_PROP_DIR);
                return;
            }
            String logbackXMLPath=System.getProperty(LOG_BACK_XML_SYSTEM_PROPERTY);
            if(StringUtils.isEmpty(logbackXMLPath)){
                LOG.info("Could not finnd {} System property for loading logback.xml Please specify valid path for it proper loaggin ", LOG_BACK_XML_SYSTEM_PROPERTY);
            }
            LOG.info("ApplicationRunner Spring boot application start from this class");
            SpringApplication.run(ApplicationRunner.class, args);

        }
        @Bean
        public EmbeddedServletContainerFactory servletContainer() {
            TomcatEmbeddedServletContainerFactory factory = new TomcatEmbeddedServletContainerFactory();
            return factory;
        }

    }

#All application Label properties configure if any.
server.context-path=/DBService
server.port=8085
hibernate.prop.dir=D:/main/resources/

还有一个问题是，如果我没有将application.properties放在d：/res/目录中，它会抛出如下Expeption，这意味着它正在读取属性文件：

例外情况：

 2016-08-07 14:40:09.435  INFO 18168 --- [           main] .b.l.ClasspathLoggingApplicationListener : Application failed to start with classpath: [file:/D:com.drd.db.services-1.0.0.M1-jar-with-dependencies.jar]
2016-08-07 14:40:09.445 ERROR 18168 --- [           main] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to load bean class: com.drd.application.configuration.ApplicationRunner; nested exception
 is java.io.FileNotFoundException: D:\htl-properties\application.properties (The system cannot find the file specified)
        at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:159)
...
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:944)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:933)
        at com.drd.application.configuration.ApplicationRunner.main(ApplicationRunner.java:45)
Caused by: java.io.FileNotFoundException: D:\res\application.properties (The system cannot find the file specified)
        at java.io.FileInputStream.open(Native Method)
        at java.io.FileInputStream.<init>(FileInputStream.java:146)
        at java.io.FileInputStream.<init>(FileInputStream.java:101)
        at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:90)
        at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:188)

Answer 1

据我所知，您希望使用application.properties中的变量。

我遵循的方式是下面这条；

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-configuration-processor</artifactId>
   </dependency>
</dependencies>

之后，还要在pom.xml中插入following标记

<build>
    <resources>
        <resource>
         <directory>src/main/resources</directory>
         <filtering>true</filtering>
         <includes>
            <include>**/*.properties</include>
         </includes>
         </resource>
    </resources>
</build>