解决Springboot中Interceptor拦截器中依赖注入失败

深碍√TFBOYSˉ_ 2022-06-12 08:40 346阅读 0赞

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?

## Answers ##

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   <td style=""> <p style="">34down voteaccepted</p> </td> 
   <td style=""> <p style="">Just do the following:</p> <pre style=""><code style=""><span style="">@EnableWebMvc</span>
<span style="">@Configuration</span>
public class WebConfig extends WebMvcConfigurerAdapter {

<span style="">@Bean</span>
    LocaleInterceptor localInterceptor() {
         return new LocalInterceptor();
    }

<span style="">@Override</span>
    public void addInterceptors(InterceptorRegistry registry) {
        registry<span style="">.addInterceptor</span>(localeInterceptor());
    }

}</code></pre> <p style="">Of course&nbsp;<code style="">LocaleInterceptor</code>&nbsp;needs to be configured as a Spring bean somewhere (XML, Java Config or using annotations) in order for the relevant field of&nbsp;<code style="">WebConfig</code>&nbsp;to get injected.</p> <p style="">The documentation for general customization of Spring's MVC configuration can be found&nbsp;<a href="http://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/" style="" rel="nofollow">here</a>, and specifically for Interceptors see&nbsp;<a href="http://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/#mvc-config-interceptors" style="" rel="nofollow">this</a>&nbsp;section</p> </td> 
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