将基于Spring的Java模块集成到独立的Java应用程序中

Question

I have a Spring-based module that I need to integrate with an existing/legacy Java "standalone" app. The Spring-based module is a simple implementation of an AuthenticationProvider (spring-security).

What I would like to do is hook up the spring based module in a Java application in a way that I can simply call the authenticate method on that provider from the Java code.

Is that possible? What is required?

Is it possible to wrap the spring module in a plain Java library and use that as API interface for my standalone Java app?

I already searched for specific tutorials but it seems there isn't one that fit this requirement.

Answer 1

OK, I have to use the ApplicationContext directly so I can manage the Spring framework in my application.

public class MyApplication {

private static final Logger LOGGER = LoggerFactory.getLogger(MyApplication.class);

public static void main(String[] args) {

    MyAuthenticationProvider authProvider;

    try (ConfigurableApplicationContext springApplicationContext = new AnnotationConfigApplicationContext(
            MySpringConfiguration.class)) {
        springApplicationContext.registerShutdownHook();
        authProvider = springApplicationContext.getBean(MyAuthenticationProvider.class);
    }

    Authentication request = new UsernamePasswordAuthenticationToken("foo", "foo");
    Authentication result = authProvider.authenticate(request);

    if (result.isAuthenticated()) {
        LOGGER.debug("User is authenticated");
    } else {
        LOGGER.debug("Cannot authenticate user.");
    }

}