HandlerInterceptor攔截器的實例

攔截器
@Component
public class TimeInterceptor implements HandlerInterceptor {


/* (non-Javadoc)
* @see org.springframework.web.servlet.HandlerInterceptor#preHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object)
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
System.out.println("preHandle");
System.out.println(((HandlerMethod)handler).getBean().getClass().getName());
System.out.println(((HandlerMethod)handler).getMethod().getName());

request.setAttribute("startTime", new Date().getTime());
return true;
}


/* (non-Javadoc)
* @see org.springframework.web.servlet.HandlerInterceptor#postHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, org.springframework.web.servlet.ModelAndView)
*/
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
System.out.println("postHandle");
Long start = (Long) request.getAttribute("startTime");
System.out.println("time interceptor 耗時:"+ (new Date().getTime() - start));


}


/* (non-Javadoc)
* @see org.springframework.web.servlet.HandlerInterceptor#afterCompletion(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, java.lang.Exception)
*/
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
System.out.println("afterCompletion");
Long start = (Long) request.getAttribute("startTime");
System.out.println("time interceptor 耗時:"+ (new Date().getTime() - start));
System.out.println("ex is "+ex);


}


}


配置中心
@Configuration
public class FilterConfig extends WebMvcConfigurerAdapter {
@Autowired
private TimeInterceptor timeInterceptor;

@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(timeInterceptor);
}
    @Bean
    public FilterRegistrationBean timeFilter() {
    FilterRegistrationBean registrationBean = new FilterRegistrationBean();
TimeFilter timeFilter =  new TimeFilter();
registrationBean.setFilter(timeFilter);
List<String> urls = new ArrayList<>();
urls.add("/*");
registrationBean.setUrlPatterns(urls);
    return registrationBean;
    }
}