从xml应用程序上下文中弹簧加载命令行参数

Question

How can I use varargs from Spring application context xml?

java -jar my.jar --variable=value

application-context.xml

<bean id="fooClassInstance" class="my.package.FooClass">
    <property name="myproperty" value="${variable}" />
</bean>

Answer 1

Try to use System properties:

java -Dvariable=value -jar my.jar

That either works out of the box or you need to tell the app context to look at system properties when it expands variables. It's been a while since I tried that.

A good starting point is PropertySourcesPlaceholderConfigurer .

Answer 2

When you do something like this in your Spring XML config

<bean id="fooClassInstance" class="my.package.FooClass">
    <property name="myproperty" value="${variable}" />
</bean>

Spring uses PropertyPlaceholderConfigurer to search for those variables in System/enviroment variables and/or list of predefined properties files.

So the easiest way is to pass that value as a system or environment variable with -Dvariable=value .

If you want to pass those values as arguments into min you can still do hacks like

public static void main(String[] args) {
    // parse arguments into key, value pairs
    System.setProperty(<key>, <value>);
    ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext(<your XML config file>);
    // use Spring context to get beans
}