不会从tomcat中设置的环境变量中获取配置文件，而是在web.xml中提及时进行配置

问题描述

我创建了一个配置文件的环境变量条目以在我的Web应用程序中处于活动状态:在Tomcat服务器的setenv.bat文件中JAVA_OPTS =％JAVA_OPTS％-Dspring.profiles.active =产品

I have created a environment variable entry of profile to be active in my web application:In setenv.bat file in Tomcat serverJAVA_OPTS=%JAVA_OPTS% -Dspring.profiles.active=prod

当我的应用程序尝试使用活动配置文件加载数据源时，由于未设置活动配置文件，因此会出现异常.

And when my application tries to load datasource using active profile it gives exception as no active profile is set.

applicationcontext.xml中的条目:

Entry in applicationcontext.xml:

 <beans profile="dev">
  <bean id="myDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName"  value="oracle.jdbc.driver.OracleDriver"></property>
        <property name="url" value="jdbc:oracle:thin:@localhost:1521:books"></property>
        <property name="username" value="system"></property>
        <property name="password" value="xyz"></property>
    </bean>
    </beans>

    <beans profile="prod">
  <bean id="myDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName"  value="oracle.jdbc.driver.OracleDriver"></property>
        <property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"></property>
        <property name="username" value="system"></property>
        <property name="password" value="abc"></property>
    </bean>
    </beans>

</beans>

但是，当我通过web.xml条目执行相同的操作时，它会起作用:

However when i do the same thing via web.xml entry it works:

 <context-param>
    <param-name>spring.profiles.active</param-name>
    <param-value>dev</param-value>
    </context-param>

任何人都可以告诉我使用环境变量加载配置文件有什么问题.

Can anyone please tell me what is the problem in loading profile using environment variable.

推荐答案

因为该命令行选项为Tomcat本身定义了系统属性，所以运行的Web上下文不会自动选择该属性.

Because that command-line option defines a system property for Tomcat itself, which is not automatically picked up by the web contexts it is running.

类似的东西可能会起作用:

<context-param>
  <param-name>spring.profiles.active</param-name>
  <param-value>${spring.profiles.active}</param-value>
</context-param>

或者，根据要对部署进行的更改类型，您可能需要查看Spring Boot，它可以简化配置和启动单个Spring应用程序的过程.

Or, depending on what kind of change you want to make to your deployments, you might want to look at Spring Boot, which simplifies configuring and launching a single Spring application.

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