Springboot - -web应用开发-Servlets, Filters, listeners

一.Web开发使用 Controller 基本上可以完成大部分需求，但是我们还可能会用到 Servlet、 Filter、 Listener等等

二.在spring boot中的三种实现方式

方法一：通过注册ServletRegistrationBean、 FilterRegistrationBean 和 ServletListenerRegistrationBean 获得控制

servlet类：

package com.demo.example.util.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpServletRequest;

public class CustomServlet extends HttpServlet {

	/**

	 *

	 */

	private static final long serialVersionUID = 1L;

	@Override

	protected void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		// TODO Auto-generated method stub

		System.out.println("servlet get method");

		doPost(request , response);

	}

	@Override

	protected void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		// TODO Auto-generated method stub

		System.out.println("servlet get method");

		response.getWriter().write("Hello world");

	}

}

filter类：

package com.demo.example.util.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;

public class CustonFilter implements Filter {

	@Override

	public void destroy() {

		// TODO Auto-generated method stub

		System.out.println("do destroy");

	}

	@Override

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

			throws IOException, ServletException {

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

		chain.doFilter(request, response);

	}

	@Override

	public void init(FilterConfig arg0) throws ServletException {

		// TODO Auto-generated method stub

		System.out.println("do init");

	}

}

　Listener类：

package com.demo.example.util.listener;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

public class CustomListener implements ServletContextListener {

	@Override

	public void contextDestroyed(ServletContextEvent servletContextEvent) {

		// TODO Auto-generated method stub

		System.out.println("servletContextEvent");

	}

	@Override

	public void contextInitialized(ServletContextEvent servletContextEvent) {

		// TODO Auto-generated method stub

		System.out.println("servletContextEvent");

	}

}

注册bean（第一种方式）

代码注册：（在SpringBootDemoFilerServletLisApplication类中）

@Bean

	public ServletRegistrationBean<CustomServlet> servletRegistrationBean() {

		return new ServletRegistrationBean<CustomServlet>(new CustomServlet(), "/customServlet");

	}

	@Bean

	public FilterRegistrationBean<CustonFilter> filterRegistrationBean(){

		return new FilterRegistrationBean<CustonFilter>(new CustonFilter(),servletRegistrationBean() );

	}

	@Bean

	public ServletListenerRegistrationBean<CustomListener> servletListenerRegistrationBean(){

		return new ServletListenerRegistrationBean<CustomListener>(new CustomListener());

	}

　第二种代码注册：（类似一）

@SpringBootApplication

public class SpringBootDemoFilerServletLisApplication implements ServletContainerInitializer{

	@Override

	public void onStartup(Set<Class<?>> arg0, ServletContext servletContext) throws ServletException {

		// TODO Auto-generated method stub

		servletContext.addServlet("CustomServlet", new CustomServlet()).addMapping("/customServlet");

		servletContext.addFilter("CustonFilter", new CustonFilter()).addMappingForServletNames(EnumSet.of(DispatcherType.REQUEST), true, "CustomServlet");

		servletContext.addListener(new CustomListener());

	}

　第三种基于注释：

首先：在 SpringBootDemoFilerServletLisApplication 类中添加

在listener

在servlet

在filter ( "/*" 代表过滤全局 )

巴特西

Springboot - -web应用开发-Servlets, Filters, listeners

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