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tomcat的context.xml文件如何获取系统环境变量

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tomcat的context.xml文件如何获取系统环境变量

为了不手动修改tomcat配置文件，我在context.xml文件中，配置了形如${user_name}这样的参数，系统环境变量中配置了user_name=张三，但是并不能读取到这个值，有什么方法可以获取到系统环境变量？


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在bin目录下新建文件setenv.sh,添加内容：JAVA_OPTS="-Dusername=$USERNAME",tomcat会自动加载这个文件，然后文件中就可以用${username}获取到内容了


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