@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
? ? /**
? ? ?* 注冊(cè)攔截器
? ? ?*/
? ? @Override
? ? public void addInterceptors(InterceptorRegistry registry) {
? ? ? ? registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**.html").excludePathPatterns("/Ylogin.html","/Yindex.html","/YRegister.html");
? ? }
}

public class MyInterceptor implements HandlerInterceptor {
? ? //在請(qǐng)求處理之前進(jìn)行調(diào)用（Controller方法調(diào)用之前
? ? @Override
? ? public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
? ? ? ? System.out.println("開始請(qǐng)求地址攔截");
? ? ? ? //獲取session
? ? ? ? HttpSession session = httpServletRequest.getSession();
? ? ? ? if (session.getAttribute("user") != null)
? ? ? ? ? ? return true;
? ? ? ? httpServletResponse.sendRedirect("/Ylogin.html");
? ? ? ? ? ? return false;
? ? }
? ? //請(qǐng)求處理之后進(jìn)行調(diào)用，但是在視圖被渲染之前（Controller方法調(diào)用之后）
? ? @Override
? ? public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
? ? ? ? System.out.println("postHandle被調(diào)用");
? ? }
? ? //在整個(gè)請(qǐng)求結(jié)束之后被調(diào)用，也就是在DispatcherServlet 渲染了對(duì)應(yīng)的視圖之后執(zhí)行（主要是用于進(jìn)行資源清理工作）
? ? @Override
? ? public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
? ? ? ? System.out.println("afterCompletion被調(diào)用");
? ? }
}

$.ajax({
? ? ? ? ? ? type: "POST",
? ? ? ? ? ? url: "/user/doLogin",
? ? ? ? ? ? dataType: "json",
? ? ? ? ? ? data:user,
? ? ? ? ? ? async:false,
? ? ? ? ? ? success: function(res) {}
? ? ? ? ? ? })