Spring Boot中拦截RestController请求失效问题求助

我帮你排查了下代码，发现拦截器没生效的核心原因是配置类没被Spring容器扫描到，还有几个小细节可以优化，具体方案如下：

1. 修复组件扫描范围，让配置类被加载 #

你的Application类的@SpringBootApplication只指定了扫描com.amazonaws.lambda.keefinty.controllers包，但配置类MyConfiguration在com.amazonaws.lambda.keefinty.application包，这个包不在扫描范围内，Spring根本没加载这个配置类，自然不会执行拦截器注册逻辑。

修改Application类的扫描范围，把根包包含进去：

package com.amazonaws.lambda.keefinty.application;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

@SpringBootApplication(scanBasePackages={"com.amazonaws.lambda.keefinty"})
public class Application extends SpringBootServletInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

或者更简洁：把Application类移到com.amazonaws.lambda.keefinty根包下，@SpringBootApplication默认会扫描当前包及其子包，就不用手动指定scanBasePackages了。

2. 替换过时的WebMvcConfigurerAdapter #

从Spring 5开始，WebMvcConfigurerAdapter已经被废弃，推荐直接实现WebMvcConfigurer接口（接口方法都是默认方法，无需全部实现）：

package com.amazonaws.lambda.keefinty.application;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import com.amazonaws.lambda.keefinty.interceptors.MyInterceptor;

@Configuration
public class MyConfiguration implements WebMvcConfigurer {

    @Bean
    public MyInterceptor getInterceptor() {
        return new MyInterceptor();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        System.out.println("\n\nAdding interceptors\n\n");
        registry.addInterceptor(getInterceptor()).addPathPatterns("/**");
    }
}

3. 优化拦截器的Bean注册方式 #

你的MyInterceptor已经加了@Component注解，Spring会自动创建这个Bean，所以配置类里的@Bean可以去掉，改用构造注入，避免重复创建Bean：

package com.amazonaws.lambda.keefinty.application;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import com.amazonaws.lambda.keefinty.interceptors.MyInterceptor;

@Configuration
public class MyConfiguration implements WebMvcConfigurer {

    private final MyInterceptor myInterceptor;

    // 构造注入拦截器Bean
    public MyConfiguration(MyInterceptor myInterceptor) {
        this.myInterceptor = myInterceptor;
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        System.out.println("\n\nAdding interceptors\n\n");
        registry.addInterceptor(myInterceptor).addPathPatterns("/**");
    }
}

如果你更倾向于用@Bean创建拦截器，那可以去掉MyInterceptor上的@Component注解，二选一即可。

验证步骤 #

修改完成后启动应用：

1. 观察控制台是否打印Adding interceptors，如果打印了说明配置类已被加载；
2. 发送请求（带/不带token），检查是否触发MyInterceptor里的preHandle逻辑，比如控制台打印In MyInterceptor.preHandle，或者不带token时抛出预期的异常。

内容的提问来源于stack exchange，提问作者user6495105