[英]Spring cloud - Resttemplate doesn't get injected in interceptor
我在Spring Boot应用程序中创建了一个resttemplate,如下所示:
@Configuration
public class MyConfiguration {
@LoadBalanced
@Bean
RestTemplate restTemplate() {
return new RestTemplate();
}
}
自动接线时,在所有类中都可以正常工作。 但是,在我的拦截器中,这引发了nullpointer异常。
原因可能是什么?如何在拦截器中配置负载平衡(使用功能区)resttemplate?
更新:
我的拦截器:
public class MyInterceptor implements HandlerInterceptorAdapter {
@Autowired
RestTemplate restTemplate;
public boolean preHandle(HttpServletRequest request,
HttpServletResponse response, Object handler)
throws Exception {
HttpHeaders headers = new HttpHeaders();
...
HttpEntity<String> entity = new HttpEntity<String>(headers);
//restTemplate is null here
ResponseEntity<String> result =
restTemplate.exchange("<my micro service url using service name>",
HttpMethod.POST, entity, String.class);
...
return true;
}
拦截器像这样添加到Spring Boot应用程序中:
@Configuration
public class MyConfigAdapter extends WebMvcConfigurerAdapter {
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new MyInterceptor()).addPathPatterns("/*");
}
}
您会误解@Autowired
工作方式。 一旦在@Bean
方法之外new MyInterceptor()
,它将不会自动装配。
执行以下操作:
@Configuration
public class MyConfigAdapter extends WebMvcConfigurerAdapter {
@Autowired
MyInterceptor myInterceptor;
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(myInterceptor).addPathPatterns("/*");
}
}
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