新建一个拦截器类，实现 org.springframework.web.servlet.HandlerInterceptor 接口，重写preHandle、postHandle、afterCompletion方法分别是处理前、处理中、处理后。
public class RequestInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("目标方法执行前！"); } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("目标方法执行时！"); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println("目标方法执行后！"); }
}
在配置类中添加该拦截器，如下：
方式一：根据后缀放行，这样要是文件类型很多的话是不是就很麻烦呢
@Configuration public class WebConfig implements WebMvcConfigurer { @Override public void addInterceptors(InterceptorRegistry registry) { //注册TestInterceptor拦截器 InterceptorRegistration registration = registry.addInterceptor(new RequestInterceptor()); registration.addPathPatterns("/**"); //所有路径都被拦截 registration.excludePathPatterns( //添加不拦截路径 "/**/*.html", "/**/*.js", //js静态资源 "/**/*.css", //css静态资源 "/**/*.woff", "/**/*.ttf" ); } }
方式二：有个问题就是：静态资源是默认static下的，请求路径中没有static,所以放行不成功
@Configuration public class WebConfig implements WebMvcConfigurer { @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new RequestInterceptor()).addPathPatterns("/**").excludePathPatterns("/toLogin","/login","/logout","/static/**"); }
方式三：就是直接配置拦截所有，然后在拦截器中对url筛选，只要是请求的静态资源就直接返回true,但是感觉做了一些无用功
@Configuration public class WebConfig implements WebMvcConfigurer { @Override public void addInterceptors(InterceptorRegistry registry) { registration.addInterceptor(new RequestInterceptor()).addPathPatterns("/**"); }
}
//拦截器中
@Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { boolean check = false; StringBuffer url = request.getRequestURL(); if(isStatic(url)){ check = true; }else{ Object auth = request.getSession().getAttribute("auth"); if(auth == null){ String scheme = request.getScheme(); String serverName = request.getServerName(); int port = request.getServerPort(); String context = request.getContextPath(); String path = scheme+"://"+serverName+":"+port+context+"/"; String str = "<script language=‘javascript‘>alert(‘登录状态过期，请重新登陆!‘);" +"if (window != top){top.location.href = ‘"+ path +"login‘;}location.href=‘"+path+"login‘" +"</script>"; response.setContentType("text/html;charset=UTF-8");// 解决中文乱码 try { PrintWriter writer = response.getWriter(); writer.write(str); writer.flush(); writer.close(); } catch (Exception e) {e.printStackTrace();} }else{ check = true; } } return check; } @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 { } public boolean isStatic(StringBuffer url) { boolean result = false; String[] arr = { //定义一个需要放行的数组 "/login", "/css", "/images",//图片 "/js" //js脚本 }; for (String a : arr) { if (url.indexOf(a) != -1) { result = true; } } return result; }
//excludePathPatterns放行是？ 请求路径中包含你所配置的就ok,还是你请求的是这个目录下的资源就可以呢？
原文：https://www.cnblogs.com/shewuxuan/p/12660459.html