WebMvcConfigurer添加多个拦截器的拦截路径问题

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结论：每个拦截器的addPathPatterns，excludePathPatterns添加的路径是各自独立的，如果添加的一个拦截器没有addPathPattern任何一个url则默认拦截所有请求，如果没有excludePathPatterns任何一个请求，则默认不放过任何一个请求。

验证过程：

两个拦截器：

public class TestInterceptor1 implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        response.getOutputStream().write("To TestInterceptor1...".getBytes());

        return true;
    }
}

public class TestInterceptor2 implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        response.getOutputStream().write("To TestInterceptor2...".getBytes());

        return true;
    }
}

情景一：两个拦截器的拦截路径不同

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry interceptorRegistry){
        interceptorRegistry.addInterceptor(new TestInterceptor1()).addPathPatterns("/ready");
        interceptorRegistry.addInterceptor(new TestInterceptor2()).addPathPatterns("/health");
    }
}

-------------测试结果-------------

情景二 ：其中一个拦截器不配置拦截路径

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry interceptorRegistry){
        interceptorRegistry.addInterceptor(new TestInterceptor1()).addPathPatterns("/ready");
        interceptorRegistry.addInterceptor(new TestInterceptor2());
    }
}

-------------测试结果-------------

情景三：

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry interceptorRegistry){
        interceptorRegistry.addInterceptor(new TestInterceptor1());
        interceptorRegistry.addInterceptor(new TestInterceptor2()).addPathPatterns("/health");
    }
}

-------------测试结果-------------

 情景四：其中一个拦截器的拦截路径在另一个拦截器的不拦截路径内

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry interceptorRegistry){
        interceptorRegistry.addInterceptor(new TestInterceptor1()).addPathPatterns("/ready");
        interceptorRegistry.addInterceptor(new TestInterceptor2()).excludePathPatterns("/ready");
    }
}

-------------测试结果-------------

从源码上看每个拦截器interceptor的includePatterns和excludePatterns也确实是独立的，可以参考下

public InterceptorRegistration addInterceptor(HandlerInterceptor interceptor) {
   InterceptorRegistration registration = new InterceptorRegistration(interceptor);
   this.registrations.add(registration);
   return registration;
}

public InterceptorRegistration addPathPatterns(List<String> patterns) {
   this.includePatterns.addAll(patterns);
   return this;
}

public InterceptorRegistration excludePathPatterns(List<String> patterns) {
   this.excludePatterns.addAll(patterns);
   return this;
}

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