注册Servlet三大组件

自定义嵌入式servlet容器

1、创建自定义servlet类

package com.laoxu.springboot.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class MyServlet extends HttpServlet {
    //get请求
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }
    //post请求
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("hello myservlet");
    }
}

2、配置注册自定义servlet容器

package com.laoxu.springboot.config;

import com.laoxu.springboot.servlet.MyServlet;
import org.springframework.boot.web.server.ConfigurableWebServerFactory;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MyServerConfig {

    //注册三大组件
    @Bean
    public ServletRegistrationBean myservlet(){
        ServletRegistrationBean<MyServlet> RegistrationBean = new ServletRegistrationBean<>(new MyServlet(), "/myServlet");
        return RegistrationBean;
    }

    @Bean
    public WebServerFactoryCustomizer<ConfigurableWebServerFactory> webServerFactoryCustomizer(){
        return new WebServerFactoryCustomizer<ConfigurableWebServerFactory>() {
            @Override
            public void customize(ConfigurableWebServerFactory factory) {
                factory.setPort(8088);
            }
        };
    }
}

1) 、修改端口为8088

2) 、访问/myServlet时 打印hello myservlet

3、创建自定义filter类

package com.laoxu.springboot.filter;

import javax.servlet.*;
import java.io.IOException;

public class MyFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("MyFilter process");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void destroy() {

    }
}

4、配置注册自定义filter类

package com.laoxu.springboot.config;

import com.laoxu.springboot.filter.MyFilter;
import com.laoxu.springboot.servlet.MyServlet;
import org.springframework.boot.web.server.ConfigurableWebServerFactory;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Arrays;

@Configuration
public class MyServerConfig {

    //注册三大组件
    @Bean
    public ServletRegistrationBean myservlet(){
        ServletRegistrationBean<MyServlet> RegistrationBean = new ServletRegistrationBean<>(new MyServlet(), "/myServlet");
        return RegistrationBean;
    }


    @Bean
    public FilterRegistrationBean myFilter(){
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(new MyFilter());
        registrationBean.setUrlPatterns(Arrays.asList("/hello","/myServlet"));
        return registrationBean;
    }

    @Bean
    public WebServerFactoryCustomizer<ConfigurableWebServerFactory> webServerFactoryCustomizer(){
        return new WebServerFactoryCustomizer<ConfigurableWebServerFactory>() {
            @Override
            public void customize(ConfigurableWebServerFactory factory) {
                factory.setPort(8088);
            }
        };
    }
}

访问/hello /myServlet 打印MyFilter process

5、创建自定义listener类

package com.laoxu.springboot.listener;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class MyListener implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        System.out.println("contextInit...应用启动");
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        System.out.println("contextDestroyed...服务器关闭");
    }
}

6、注册自定义listener类

package com.laoxu.springboot.config;

import com.laoxu.springboot.filter.MyFilter;
import com.laoxu.springboot.listener.MyListener;
import com.laoxu.springboot.servlet.MyServlet;
import org.springframework.boot.web.server.ConfigurableWebServerFactory;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Arrays;

@Configuration
public class MyServerConfig {

    //注册三大组件
    @Bean
    public ServletRegistrationBean myservlet(){
        ServletRegistrationBean<MyServlet> RegistrationBean = new ServletRegistrationBean<>(new MyServlet(), "/myServlet");
        return RegistrationBean;
    }


    @Bean
    public FilterRegistrationBean myFilter(){
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(new MyFilter());
        registrationBean.setUrlPatterns(Arrays.asList("/hello","/myServlet"));
        return registrationBean;
    }

    @Bean
    public ServletListenerRegistrationBean<MyListener> myListener(){
        ServletListenerRegistrationBean<MyListener> registrationBean = new ServletListenerRegistrationBean<>(new MyListener());
        return registrationBean;
    }

    @Bean
    public WebServerFactoryCustomizer<ConfigurableWebServerFactory> webServerFactoryCustomizer(){
        return new WebServerFactoryCustomizer<ConfigurableWebServerFactory>() {
            @Override
            public void customize(ConfigurableWebServerFactory factory) {
                factory.setPort(8088);
            }
        };
    }
}

在启动和销毁时打印提示信息