SpringBoot拦截器未生效解决方案_springboot拦截器不生效

SpringBoot拦截器未生效的可能原因：

1. 注解是否添加齐全（@Component、@Configuration）；

2. 是否有多个配置类同时继承了WebMvcConfigurationSupport类，或实现了WebMvcConfigurer， 多个配置类只会生效前一个配置类，后一个配置类不会生效 ；

例：

swagger的配置类：

@Configuration
public class ServletContextConfig extends WebMvcConfigurationSupport {
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/**").addResourceLocations("classpath:/static/");
        registry.addResourceHandler("swagger-ui.html")
                .addResourceLocations("classpath:/META-INF/resources/");
        registry.addResourceHandler("/webjars/**")
                .addResourceLocations("classpath:/META-INF/resources/webjars/");
        super.addResourceHandlers(registry);
    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }
}
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拦截器配置类：

/**
 * 拦截器
 */
@Configuration
public class WebConfigurer implements WebMvcConfigurer {

    @Autowired
    private TestInterceptor loginInterceptor;

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {

    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 表示拦截所有的请求，
        registry.addInterceptor(loginInterceptor).addPathPatterns("/**");
    }
}
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SpringBoot项目已经配置了Swagger用来管理api，然后再另外建一个拦截器配置类，此时拦截器配置类就不会生效，因为WebMvcConfigurer和WebMvcConfigurationSupport都是用来配置WebMvc的，WebMvcConfigurer只是WebMvcConfigurationSupport的一个扩展类，它并没有扩展新功能，只是为让用户更方便安全的添加自定义配置 ；

WebMvcConfigurer和WebMvcConfigurationSupport的区别说明： https://www.cnblogs.com/JonaLin/p/11633820.html

所以解决拦截器失效的方法是在一个配置类里重写这两个方法 ，如下

@Configuration
public class ServletContextConfig extends WebMvcConfigurationSupport {
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/**").addResourceLocations("classpath:/static/");
        registry.addResourceHandler("swagger-ui.html")
                .addResourceLocations("classpath:/META-INF/resources/");
        registry.addResourceHandler("/webjars/**")
                .addResourceLocations("classpath:/META-INF/resources/webjars/");
        super.addResourceHandlers(registry);
    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

// 下面是拦截器内容 

    @Autowired
    private TestInterceptor testInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(testInterceptor).addPathPatterns("/**");
    }
}
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TestInterceptor拦截器：

@Component
public class TestInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.err.println("================>");
        return false;
    }
}
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