執行順序:過濾器-->攔截器:preHandle-->controller -->攔截器:視圖渲染前-->postHandler-->攔截器:視圖渲染-->afterCompletion
@Component
public class LangFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
Locale locale = request.getLocale();
System.out.println("過濾器: " + locale);
chain.doFilter(request,response);
}
@Override
public void destroy() {
}
}
@Component
public class LangInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
Locale locale = request.getLocale();
System.out.println("攔截器: " + locale);
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
}
}
註冊攔截器,實現攔截器最重要的步驟(和)啓動類處於同一目錄下):
@Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter {
// 這裏使用autowired無法實現攔截器
@Bean
LangInterceptor langInterceptor() {
return new LangInterceptor();
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(langInterceptor()).addPathPatterns("/**");
}
}