spring boot实现过滤器和拦截器demo
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2024-03-05 17:14:25
整理文档,搜刮出一个spring boot实现过滤器和拦截器demo ,稍微整理精简一下做下分享。
拦截器定义:
@webservlet
public c...
整理文档,搜刮出一个spring boot实现过滤器和拦截器demo ,稍微整理精简一下做下分享。
拦截器定义:
@webservlet public class actioninterceptor implements handlerinterceptor { @override public boolean prehandle(httpservletrequest request, httpservletresponse response, object handler) throws exception { // system.out.println(">>>myinterceptor1>>>>>>>在请求处理之前进行调用(controller方法调用之前)"); // 获取系统时间 calendar ca = calendar.getinstance(); int hour = ca.get(calendar.hour_of_day); // 设置限制运行时间 0-4点 if (hour < 4) { return true; } return false; } @override public void posthandle(httpservletrequest request, httpservletresponse response, object handler, modelandview modelandview) throws exception { // system.out.println(">>>myinterceptor1>>>>>>>请求处理之后进行调用,但是在视图被渲染之前(controller方法调用之后)"); } @override public void aftercompletion(httpservletrequest request, httpservletresponse response, object handler, exception ex) throws exception { // system.out.println(">>>myinterceptor1>>>>>>>在整个请求结束之后被调用,也就是在dispatcherservlet // 渲染了对应的视图之后执行(主要是用于进行资源清理工作)"); } }
拦截器使用: 关于注解 我使用的是@component 其实也可能声明成配置
@component public class applicationconfig {extends webmvcconfigureradapter @override public void addinterceptors(interceptorregistry registry) { // 多个拦截器组成一个拦截器链 // addpathpatterns 用于添加拦截规则 // excludepathpatterns 用户排除拦截 registry.addinterceptor(new actioninterceptor()).addpathpatterns("/service/extract/json/**"); super.addinterceptors(registry); } }
过滤器:
定义:
public class actionfilter implements filter { @override public void init(filterconfig filterconfig) throws servletexception { } @override public void dofilter(servletrequest request, servletresponse response, filterchain chain) throws ioexception, servletexception { // 获取系统时间 calendar ca = calendar.getinstance(); int hour = ca.get(calendar.hour_of_day); // 设置限制运行时间 0-4点 if (hour < 4) { httpservletresponse httpresponse = (httpservletresponse) response; httpresponse.setcharacterencoding("utf-8"); httpresponse.setcontenttype("application/json; charset=utf-8"); // 消息 map<string, object> messagemap = new hashmap<>(); messagemap.put("status", "1"); messagemap.put("message", "此接口可以请求时间为:0-4点"); objectmapper objectmapper=new objectmapper(); string writevalueasstring = objectmapper.writevalueasstring(messagemap); response.getwriter().write(writevalueasstring); } else { chain.dofilter(request, response); } } @override public void destroy() { } }
使用:
@component public class applicationconfig { @bean public filterregistrationbean filterregistrationbean() { filterregistrationbean registrationbean = new filterregistrationbean(); actionfilter actionfilter = new actionfilter(); registrationbean.setfilter(actionfilter); list<string> urlpatterns = new arraylist<string>(); urlpatterns.add("/service/extract/json/*"); registrationbean.seturlpatterns(urlpatterns); return registrationbean; } }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。