spring boot实现过滤器和拦截器demo

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;
  }
  

}

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