spring boot实现过滤器和拦截器demo
整理文档，搜刮出一个springboot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
publicclassActionInterceptorimplementsHandlerInterceptor{
@Override
publicbooleanpreHandle(HttpServletRequestrequest,HttpServletResponseresponse,Objecthandler)
throwsException{
//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
Calendarca=Calendar.getInstance();
inthour=ca.get(Calendar.HOUR_OF_DAY);
//设置限制运行时间0-4点
if(hour<4){
returntrue;
}
returnfalse;
}
@Override
publicvoidpostHandle(HttpServletRequestrequest,HttpServletResponseresponse,Objecthandler,
ModelAndViewmodelAndView)throwsException{
//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
publicvoidafterCompletion(HttpServletRequestrequest,HttpServletResponseresponse,Objecthandler,Exceptionex)
throwsException{
//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
publicclassApplicationConfig{extendsWebMvcConfigurerAdapter
@Override
publicvoidaddInterceptors(InterceptorRegistryregistry){
//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(newActionInterceptor()).addPathPatterns("/service/extract/json/**");
super.addInterceptors(registry);
}
}
过滤器:
定义:
publicclassActionFilterimplementsFilter{
@Override
publicvoidinit(FilterConfigfilterConfig)throwsServletException{
}
@Override
publicvoiddoFilter(ServletRequestrequest,ServletResponseresponse,FilterChainchain)
throwsIOException,ServletException{
//获取系统时间
Calendarca=Calendar.getInstance();
inthour=ca.get(Calendar.HOUR_OF_DAY);
//设置限制运行时间0-4点
if(hour<4){
HttpServletResponsehttpResponse=(HttpServletResponse)response;
httpResponse.setCharacterEncoding("UTF-8");
httpResponse.setContentType("application/json;charset=utf-8");
//消息
Map<String,Object>messageMap=newHashMap<>();
messageMap.put("status","1");
messageMap.put("message","此接口可以请求时间为:0-4点");
ObjectMapperobjectMapper=newObjectMapper();
StringwriteValueAsString=objectMapper.writeValueAsString(messageMap);
response.getWriter().write(writeValueAsString);
}else{
chain.doFilter(request,response);
}
}
@Override
publicvoiddestroy(){
}
}
使用:
@Component
publicclassApplicationConfig{
@Bean
publicFilterRegistrationBeanfilterRegistrationBean(){
FilterRegistrationBeanregistrationBean=newFilterRegistrationBean();
ActionFilteractionFilter=newActionFilter();
registrationBean.setFilter(actionFilter);
List<String>urlPatterns=newArrayList<String>();
urlPatterns.add("/service/extract/json/*");
registrationBean.setUrlPatterns(urlPatterns);
returnregistrationBean;
}
}
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毛票票。