拦截器链配置

多拦截器执行顺序

• 当配置多个拦截器时，形成拦截器链
• 拦截器的运行顺序参照拦截器添加顺序为准
• 当拦截器中出现对原始处理器的拦截，后面的拦截器均终止运行
• 当拦截器运行中断，仅运行配置在前面的拦截器的aftercompletion操作

package com.xxx.controller.interceptor;

@Component
public class ProjectInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String contentType = request.getHeader("Content-Type");
        HandlerMethod hm = (HandlerMethod)handler;
        System.out.println("preHandle..."+contentType);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle...");
    }

    @Override
    public boolean afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

        System.out.println("afterCompletion...");
    }
}

package com.xxx.controller.interceptor;

@Component
public class ProjectInterceptor2 implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle...222");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle...222");
    }

    @Override
    public boolean afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

        System.out.println("afterCompletion...222");
    }
}

@Configuration
@Component({"com.xxx.controller"})
@EnableWebMvc
public class SpringMvcConfig implements WebMvcConfigurer {
    @Autowired
    private ProjectInterceptor projectInterceptor;

    @Autowired
    private ProjectInterceptor2 projectInterceptor2;


    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptors(projectInterceptor).addPathPatterns("/books", "/books/*");
        registry.addInterceptors(projectInterceptor2).addPathPatterns("/books", "/books/*");
    }
}