1.spring mvc專案可以直接在controller裡面注入request,response

@Autowired
private HttpServletRequest request;
@Autowired
private HttpServletResponse response;

然後就突發奇想是否可以@Ahtowired注入其他bean，最後發現使用@Configuration @Bean這兩個標籤可以注入，不過idea會報錯，但是不影響使用,程式碼如下：

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
 
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
@Configuration
class RestConfig {

   @Bean
   @Primary
public RestTemplate restTemplate(RestTemplateBuilder builder, ClientHttpRequestFactory factory) {
      return builder.requestFactory(factory).build();
 
}

   @Bean
public ClientHttpRequestFactory httpComponentsClientHttpRequestFactory(CloseableHttpClient httpClient) {
      HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory(httpClient);
factory.setReadTimeout(5000); // ms
factory.setConnectTimeout(15000);// ms
return 
 
factory;
}

   @Bean
public CloseableHttpClient httpClient() {
      return HttpClientBuilder.create().build();
}

}

在再controller裡面使用@Autowired可以注入RestTemplate、ClientHttpRequestFactory、CloseableHttpClient了