问题
I want to add spring mvc interceptor as part of Java config. I already have a xml based config for this but I am trying to move to a Java config. For interceptors, I know that it can be done like this from the spring documentation-
@EnableWebMvc
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new LocaleInterceptor());
}
}
But my interceptor is using a spring bean autowired into it like follows-
public class LocaleInterceptor extends HandlerInterceptorAdaptor {
@Autowired
ISomeService someService;
...
}
The SomeService class looks like follows-
@Service
public class SomeService implements ISomeService {
...
}
I am using annotations like @Service for scanning the beans and have not specified them in the configuration class as @Bean
As my understanding, since java config uses new for creating the object, spring will not automatically inject the dependencies into it.
How can I add the interceptors like this as part of the java config?
回答1:
Just do the following:
@EnableWebMvc
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {
@Bean
LocaleInterceptor localInterceptor() {
return new LocalInterceptor();
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(localeInterceptor());
}
}
Of course LocaleInterceptor needs to be configured as a Spring bean somewhere (XML, Java Config or using annotations) in order for the relevant field of WebConfig to get injected.
The documentation for general customization of Spring's MVC configuration can be found here, and specifically for Interceptors see this section
回答2:
When you handle the object creation for yourself like in:
registry.addInterceptor(new LocaleInterceptor());
there is no way the Spring container can manage that object for you and therefore make the necessary injection into your LocaleInterceptor.
Another way that could be more convenient for your situation, is to declare the managed @Bean in the @Configuration and use the method directly, like so:
@EnableWebMvc
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {
@Bean
public LocaleInterceptor localeInterceptor() {
return new LocaleInterceptor();
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor( localeInterceptor() );
}
}
回答3:
Try to inject your service as a constructor parameter. It is simple.
@EnableWebMvc
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {
@Autowired
ISomeService someService;
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new LocaleInterceptor(someService));
}
}
Then reconfigure your interceptor,
public class LocaleInterceptor extends HandlerInterceptorAdaptor {
private final ISomeService someService;
public LocaleInterceptor(ISomeService someService) {
this.someService = someService;
}
}
Cheers !
来源：https://stackoverflow.com/questions/23349180/java-config-for-spring-interceptor-where-interceptor-is-using-autowired-spring-b