作者：毕涛涛，致力于Java学习的践行者。原创文章，转载请注明出处。
整合web开发
1.整合Servlet
2.整合Filter
3.整合Listener
一、整合Servlet
通过注解扫描完成Servlet组件的注册
1.编写Servlet
package com.deewinkg.servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
/**
* SpringBoot整合Servlet方式一
* @author DY
*
* <servlet>
* <servlet-name>FirstServlet</servlet-name>
* <servlet-class>com.deewinkg.servlet.FirstServlet</servlet-class>
* </servlet>
*
* <servlet-mapping>
* <servlet-name>FirstServlet</servlet-name>
* <url-pattern>/first</url-pattern>
* </servlet-mapping>
*
*/
@WebServlet(name = "FirstServlet",urlPatterns = "/first")
public class FirstServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
PrintWriter writer = resp.getWriter();
writer.print("FirstServlet...");
}
}
2.编写启动类
package com.deewinkg;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
/**
* SpringBoot整合Servlet方式一
* @author DY
*/
@SpringBootApplication
@ServletComponentScan //在springBoot启动时会扫描@WebServlet，并将该类实例化
public class App1 {
public static void main(String[] args) {
SpringApplication.run(App1.class,args);
}
}
通过注解扫描servlet组件.png
通过方法完成Servlet组件的注册
1.编写Servlet
package com.deewinkg.servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
/**
* SpringBoot整合Servlet方式二
* @author DY
*/
public class SecondServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
PrintWriter writer = resp.getWriter();
writer.print("SecondServlet...");
}
}
2.编写启动类
package com.deewinkg;
import com.deewinkg.servlet.SecondServlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
public class App2 {
public static void main(String[] args) {
SpringApplication.run(App2.class,args);
}
@Bean
public ServletRegistrationBean getServletRegistrationBean()
{
ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());
bean.addUrlMappings("/secondServlet");
return bean;
}
}
通过方法完成servlet组件的注册.png
二、整合Filter
通过注解扫描完成Filter组件的注册
1.编写Filter
package com.deewinkg.filter;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
import java.io.PrintWriter;
/**
* SpringBoot 整合 Filter 方式一
* @author DY
* <filter>
* <filter-name>FirstFilter</filter-name>
* <filter-class>com.deewinkg.filter.FirstFilter</filter-class>
* </filter>
* <filter-mapping>
* <filter-name>FirstFilter</filter-name>
* <url-pattern>/first</url-pattern>
* </filter-mapping>
*/
//@WebFilter(filterName="FirstFilter",urlPatterns={"*.do","*.jsp"})
@WebFilter(filterName ="FirstFilter",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Filter");
filterChain.doFilter(servletRequest, servletResponse);
System.out.println("离开Filter");
}
@Override
public void destroy() {
}
}
2.编写启动类
package com.deewinkg;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
/**
* SpringBoot整合Filter方式一
* @author DY
*/
@SpringBootApplication
@ServletComponentScan //在springBoot启动时会扫描@WebServlet，并将该类实例化
public class App1 {
public static void main(String[] args) {
SpringApplication.run(App1.class,args);
}
}
通过注解扫描filter组件.png
通过方法完成Filter组件的注册
1.编写filter
package com.deewinkg.filter;
import javax.servlet.*;
import java.io.IOException;
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("Filter Start...");
filterChain.doFilter(servletRequest,servletResponse);
System.out.println("Filter End...");
}
@Override
public void destroy() {
}
}
2.编写启动类
package com.deewinkg;
import com.deewinkg.filter.SecondFilter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
/**
* SpringBoot 整合 Filter 方式二
*/
@SpringBootApplication
public class App2 {
public static void main(String[] args) {
SpringApplication.run(App2.class,args);
}
/**
* 注册 Filter
* @return
*/
@Bean
public FilterRegistrationBean getFilterRegistrationBean()
{
FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter());
//bean.addUrlPatterns(new String[]{"*.do","*.jsp"});
bean.addUrlPatterns("/secondFilter");
return bean;
}
}
通过方法完成filter组件注册.png
三、整合listener
通过注解扫描完成listener组件的注册
1.编写listener
package com.deewinkg.listener;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
/**
* SpringBoot整合listener方式一
* <listener>
* <listener-class>com.deewinkg.listener.FirstListener</listener-class>
* </listener>
*/
@WebListener
public class FirstListener implements ServletContextListener
{
@Override
public void contextInitialized(ServletContextEvent sce) {
System.out.println("Listener...init......");
}
@Override
public void contextDestroyed(ServletContextEvent sce) {
}
}
2.编写启动类
package com.deewinkg;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
/**
* SpringBoot整合Filter方式一
* @author DY
*/
@SpringBootApplication
@ServletComponentScan
public class App1 {
public static void main(String[] args) {
SpringApplication.run(App1.class,args);
}
}
通过注册扫描完成listener组件的注册.png
通过方法完成Listener组件的注册
1.编写listener
package com.deewinkg.listener;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
/**
* SpringBoot整合listener方式二
*/
public class SecondListener implements ServletContextListener
{
@Override
public void contextInitialized(ServletContextEvent sce) {
System.out.println("......listener组件初始化......");
}
@Override
public void contextDestroyed(ServletContextEvent sce) {
}
}
2.编写启动类
package com.deewinkg;
import com.deewinkg.listener.SecondListener;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.context.annotation.Bean;
/**
* SpringBoot 整合 Filter 方式二
*/
@SpringBootApplication
public class App2 {
public static void main(String[] args) {
SpringApplication.run(App2.class,args);
}
/**
* 注册listener
* @return
*/
@Bean
public ServletListenerRegistrationBean<SecondListener> getServletListenerRegistrationBean()
{
ServletListenerRegistrationBean<SecondListener> bean = new ServletListenerRegistrationBean<SecondListener>(new SecondListener());
return bean;
}
}
3.运行结果
通过方法完成Listener组件的注册.png
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