Spring boot filter, listener "Learn Spring boot from scratch"

Last Update:2017-04-14 Source: Internet

Author: User

Tags i18n log4j

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Reprint: http://blog.csdn.net/linxingliang/article/details/52069490

The previous article has explained how the servlet is defined, and the method of registering filters (filter) and listeners (Listener) is just as unclear as the servlet, which can be viewed in the next article (20): This article will use @webfilter and @weblistener directly to complete a filter and a Listener; use annotations

@ServletComponentScan//This is to scan the corresponding servlet package;

Filters (Filter) file

Com.kfit.filter.MyFilter.Java

Package com.kfit.filter;

import java.io.IOException;

import Javax.servlet.Filter;

import Javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import Javax.servlet.annotation.WebFilter;

/**

* Use annotation Callout filter

* @WebFilter defines a class that implements the Javax.servlet.Filter interface as a filter

* Attribute filtername The name of the filter, optional

* attribute urlpatterns Specifies the URL pattern to filter, or it can be declared using the property value. (Specifies that the URL pattern to filter is a required attribute)

* @author Angel (qq:412887952)

* @version v.0.1

@WebFilter (filtername= "Myfilter", urlpatterns= "/*")

Public class Myfilter implements filter{

@Override

Public void init (filterconfig config) throws servletexception {

System. out. println ("filter Initialization");

}

@Override

Public void DoFilter (servletrequest request, servletresponse response,

Filterchain chain) throws ioexception,servletexception {

System. out. println ("Perform filtering operations");

Chain.dofilter (request, response);

}

@Override

Public void destroy () {

System. out. println ("filter Destruction");

}

ServletContext Listener (Listener) file

Com.kfit.listener.MyServletContextListener:

Package Com.kfit.listener;

Importjavax.servlet.ServletContextEvent;

Importjavax.servlet.ServletContextListener;

Importjavax.servlet.annotation.WebListener;

/**

* Use @weblistener Annotations to implement Servletcontextlistener interface

* @author Angel (qq:412887952)

* @version v.0.1

@WebListener

public class Myservletcontextlistenerimplements Servletcontextlistener {

@Override

Publicvoid contextdestroyed (servletcontextevent arg0) {

System.out.println ("Servletcontex destruction");

}

@Override

Publicvoid contextinitialized (servletcontextevent arg0) {

SYSTEM.OUT.PRINTLN ("Servletcontex initialization");

}

ServletContext Listener (Listener) file (Httpsessionlistener)

Myhttpsessionlistener.java

? package Com.kfit.listener;

Import Javax.servlet.annotation.WebListener;

Import javax.servlet.http.HttpSessionEvent;

Import Javax.servlet.http.HttpSessionListener;

/**

* Monitor session creation and destruction

@WebListener

Publicclassmyhttpsessionlistenerimplementshttpsessionlistener {

@Override

Publicvoid sessioncreated (Httpsessioneventse) {

System.out.println ("Session is created");

}

@Override

Publicvoid sessiondestroyed (Httpsessioneventse) {

SYSTEM.OUT.PRINTLN ("Servletcontex initialization");

}

Be careful not to forget to add @servletcomponentscan annotations on Springbootsampleapplication.java.

During the startup process we will see the output:

Servletcontex initialization

Filter initialization

After the service starts, you can see the output by visiting a page:

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