java - Spring 获取 ServletContext 并将其作为 Bean 提供

Question

I want to get the ServletContext in a Java Spring Webproject and use it to get the absolute path of my web-application project. I'm still a beginner in JavaEE and Spring, so maybe I've got some concepts wrong. In the java class, in which I want to use the ServletContext, I got only an empty object when using @Autowired ServletContext context; But in my RestConfiguartion class, which extends the WebMvcConfigurerAdapter class, I got the ServletContext and I'm able to use it in a Java Bean, with the return type of ServletContext. But I have no idea, how I can use the Bean in another class to get the ServletContext, is this possible?

@Configuration
@EnableWebMvc
@Import({ ServiceConfiguration.class, SecurityConfiguration.class })
@ComponentScan(basePackages = { "de.rest", "de.security" })
public class RestConfiguration extends WebMvcConfigurerAdapter {

  @Autowired
  ServletContext context;    

  @Bean
  public ServletContext getServletContext() {
    System.out.println("*** Context path: *** " + context.getRealPath("/"));
    return context;
  }}

Answer 1

你可以写

@Autowired
ServletContext context;

在其他 bean 注释类中也是如此。您将获得相同的上下文。 因此，您无需指定:

@Bean
  public ServletContext getServletContext() {
    System.out.println("*** Context path: *** " + context.getRealPath("/"));
    return context;
  }}

例如(目录中的任何类，在您的注释 @ComponentScan 中指定):

@Bean
class X {
    @Autowired
    ServletContext context;

    ...
}