1、整合Servlet方式一

1.1、通过注解扫描完成Servlet组件的注册

  在启动类中添加@ServletComponentScan注解,SpirngBoot启动时会扫描@WebServlet和@WebListener以及@WebFilter注解。

1.2、创建Servlet

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package com.xiezhenyu.springbootweb.servlet;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet(name = "FirstServlet",urlPatterns = "/first")
public class FirstServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) {
System.out.println("First Servlet......");
}
}

1.3、修改启动类

  在启动类中添加@ServletComponentScan注解,作用是在SpirngBoot启动时会扫描@WebServlet和@WebListener以及@WebFilter注解,并将该类实例化。

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@SpringBootApplication
@ServletComponentScan//在SpirngBoot启动时会扫描@WebServlet和@WebFilter注解,并将该类实例化
public class SpringbootwebApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootwebApplication.class, args);
}
}

2、整合Servlet方式2

2.1、通过方法完成Servlet组件的注册

  通过创建方法的方式完成Servlet组件的注册。

2.2、创建Servlet

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/**
* 整合servlet方式2
*/
public class SecondServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response){
System.out.println("Second Servlet......");
}
}

2.3、创建Servlet配置类

  Servlet配置类可以直接在启动类中配置,因为启动类中@SpringBootApplication注解也包含了@Configuration注解。也可以新建一个类中添加@Configuration注解。

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package com.xiezhenyu.springbootweb.config;
import com.xiezhenyu.springbootweb.servlet.SecondServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
*Servlet注册类
*/
@Configuration
public class ServletConfig {
/**
* 完成servlet组件的注册
*/
@Bean
public ServletRegistrationBean getServletRegistrationBean(){
ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());
bean.addUrlMappings("/second");
return bean;
}
}

3、整合Filter方式一

3.1、通过注解扫描完成Filter组件注册

  在启动类中添加@ServletComponentScan注解,SpirngBoot启动时会扫描@WebFilter和@WebListener以及@WebServlet注解。

3.2、创建Filter

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package com.xiezhenyu.springbootweb.filter;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
/**
*整合Filter方式一
*/
//@WebFilter(filterName = "FirstFiltet",urlPatterns = {"*.do","*.jsp"})
@WebFilter(filterName = "FirstFiltet",urlPatterns = "/first")
public class FirstFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println("进入First Filter。。。。。。");
filterChain.doFilter(servletRequest,servletResponse);
System.out.println("离开First Filter。。。。。。");
}
@Override
public void destroy() {
}
}

3.3、修改启动类

  在启动类中添加@ServletComponentScan注解会自动扫描@WebFilter注解和@WebListener以及@WebServlet注解。

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@SpringBootApplication
@ServletComponentScan//在SpirngBoot启动时会扫描@WebServlet注解,并将该类实例化
public class SpringbootwebApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootwebApplication.class, args);
}
}

4、整合Filter方式二

4.1、通过方法完成Filter组件注册

  通过创建方法的方式完成Filter组件的注册。

4.2、创建Filter

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package com.xiezhenyu.springbootweb.filter;
import javax.servlet.*;
import java.io.IOException;
/**
* 整合Filter方式二
*/
public class SecondFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println("进入Seond Filter。。。。。。");
filterChain.doFilter(servletRequest,servletResponse);
System.out.println("离开Second Filter。。。。。。");
}
@Override
public void destroy() {
}
}

4.3、创建Filter配置类

  Filter配置类可以直接在启动类中配置,因为启动类中@SpringBootApplication注解也包含了@Configuration注解。也可以新建一个类中添加@Configuration注解。

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package com.xiezhenyu.springbootweb.config;
import com.xiezhenyu.springbootweb.filter.SecondFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* Filter配置类
*/
@Configuration
public class FilterConfig {
@Bean
public FilterRegistrationBean getFilterRegistrationBean(){
FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter());
//bean.addUrlPatterns(new String[]{"*.do","*.jsp"});
bean.addUrlPatterns("/second");
return bean;
}
}

5、整合Listener方式一

5.1、通过注解扫描完成Listener组件注册

  在启动类中添加@ServletComponentScan注解,SpirngBoot启动时会扫描@WebServlet和@WebListener以及@WebFilter注解。

5.2、编写Listener

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package com.xiezhenyu.springbootweb.listener;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
/**
* 整合Listener方式一
*/
@WebListener
public class FirstListener implements ServletContextListener {
public void contextDestroyed(ServletContextEvent event){
}
public void contextInitialized(ServletContextEvent event){
System.out.println("Listener..init...");
}
}

5.3、修改启动类

  Listener配置类可以直接在启动类中配置,因为启动类中@SpringBootApplication注解也包含了@Configuration注解。也可以新建一个类中添加@Configuration注解。

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@SpringBootApplication
@ServletComponentScan//在SpirngBoot启动时会扫描@WebServlet注解,并将该类实例化
public class SpringbootwebApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootwebApplication.class, args);
}
}

6、整合Listener方式二

6.1、通过方法完成Listener组件注册

  通过创建方法的方式完成Listener组件的注册。

6.2、编写Listener

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package com.xiezhenyu.springbootweb.listener;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
/**
* 整合Listener方式二
*/
public class SecondListener implements ServletContextListener {
public void contextDestroyed(ServletContextEvent event){
}
public void contextInitialized(ServletContextEvent event){
System.out.println("Listener..init...");
}
}

6.3、创建Listener配置类

  Listener配置类可以直接在启动类中配置,因为启动类中@SpringBootApplication注解也包含了@Configuration注解。也可以新建一个类中添加@Configuration注解。

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/**
* listener配置类
*/
@Configuration
public class ListenerConfig {
@Bean
public ServletListenerRegistrationBean getServletListenerRegistrationBean(){
ServletListenerRegistrationBean bean = new ServletListenerRegistrationBean(new SecondListener());
return bean;
}
}