創(chuàng)建一個類并使其實現(xiàn)接口HandlerInterceptor

接口提供了一個請求的三個周期的攔截方法

在controller之前，返回true則放行，false反之,handler包含處理請求的controller類以及其方法

boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)在controller接受請求之后，contorller渲染視圖之前，如果發(fā)生異常就不執(zhí)行了,可對ModelAndView操作

void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)在controller處理全部完成之后,ex參數(shù)包含處理期間發(fā)生的異常,但僅為未被全局捕獲的異常

void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)

public class TheInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println('preHandle'); return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println('postHandle'); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println('afterCompletion'); }}

編寫完成后需要將其注冊進(jìn)處理棧中才會生效, 創(chuàng)建WebMvcConfigurer的實現(xiàn)類

@Configurationpublic class WebConfig implements WebMvcConfigurer { @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new MyInterceptor())// 需要攔截的路徑,默認(rèn)全部攔截.addPathPatterns('/test1')// 需要排除的路徑.excludePathPatterns('/test2'); }}

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