Web 过滤器无法自动连接春豆

Question

我在 Web 过滤器中发现，自动连线的 bean 无法初始化，就像下面的代码一样

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
public class ClientIpFilter implements Filter {
    @Autowired
    private Environment environment;
}

并在配置中注册 Bean

import org.springframework.boot.context.embedded.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class CustomWebSecurityConfigurerAdapter {
     @Bean
        public FilterRegistrationBean filterRegistrationBean() {
            FilterRegistrationBean registrationBean = new FilterRegistrationBean();
            ClientIpFilter securityFilter = new ClientIpFilter();
            registrationBean.setFilter(securityFilter);
            registrationBean.setOrder(1);
            return registrationBean;
        }           
}

这是因为过滤器是在其他 Bean 之前启动的吗？如果是，如何在网络过滤器中使用春豆？

Answer 1

您错过了 ClientIpFilter 类@Component注释。