此处获取env时，为null

@Component public class AllowCrossDomainInterceptor implements HandlerInterceptor { private final Environment env; @Autowired public AllowCrossDomainInterceptor(Environment env) { this.env = env; } }

@Configuration public class InterceptorConfig implements WebMvcConfigurer { @Autowired Environment env; /** * 拦截器 * addPathPatterns 用于添加拦截规则 * excludePathPatterns 用户排除拦截 */ @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new AllowCrossDomainInterceptor(env)) .addPathPatterns("/**"); } }

https://github.com/swleon/template/blob/5655f437ca4697445f678046af23214c95310c1e/springboot-web-demo/src/main/java/com/leon/config/interceptor/AllowCrossDomainInterceptor.java#L27

当进入拦截器的preHandle方法，获取env时为null.

我尝试这么写
@Component
public class AllowCrossDomainInterceptor implements HandlerInterceptor {

    private final Environment env;

    @Autowired
    public AllowCrossDomainInterceptor(Environment env) {
        this.env = env;
    }
}
使用的时候将env传入到构造函数里
@Configuration
public class InterceptorConfig implements WebMvcConfigurer {

    @Autowired
    Environment env;

    /**
     * 拦截器
     * addPathPatterns     用于添加拦截规则
     * excludePathPatterns 用户排除拦截
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new AllowCrossDomainInterceptor(env))
                .addPathPatterns("/**");

    }
}

springboot 版本2.4.3，没有空指针问题，其他版本的话，如果有问题，可以采用构造函数解决

wuquegongzi / template

此处获取env时，为null #1