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3.SpringBoot整合Servlet
步骤:
FirstServlet.java
package com.example.servlet.myservlet;
import javax.servlet.http.HttpServlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*SpringBoot整合Servlet方式一
*@WebServlet(name="MyFirstServlet",urlPatterns="/myFirst")相当于如下:
*
*
* MyFirstServlet
* ah.szxy.servlet.FirstServlet
*
*
* MyFirstServlet
* /first
*
*
*/
@WebServlet(name="MyFirstServlet",urlPatterns="/myFirst")
public class FirstServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("MyFirstServlet init............");
}
}
ServletApplication.java
package com.example.servlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@SpringBootApplication
@ServletComponentScan //在springBoot启动时会扫描@WebServlet,并将该类实例化
public class ServletApplication {
public static void main(String[] args) {
SpringApplication.run(ServletApplication.class, args);
}
}
然后启动项目
最后在浏览器输入localhost:8080/myFirstServlet,页面显示空白,在控制台打印MyFirstServlet init............
步骤:
package com.example.servlet.myservlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* 整合Servlet的第二种方式
*/
public class SecondServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("MySecondServlet init..........");
}
}
ServletApplication.java
package com.example.servlet;
import com.example.servlet.myservlet.SecondServlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
//@ServletComponentScan //在springBoot启动时会扫描@WebServlet,并将该类实例化
public class ServletApplication {
public static void main(String[] args) {
SpringApplication.run(ServletApplication.class, args);
}
/**
* 整合Servlet的第二种方式,创建ServletRegistrationBean并添加路径
* @return
*/
@Bean
public ServletRegistrationBean getServletRegistrationBean(){
ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());
bean.addUrlMappings("/mySecond");
return bean;
}
然后启动项目,在浏览器中访问localhost:8080/mySecondServlet,页面也是空白,在控制台就会打印MySecondServlet init..........
项目,结构如图所示
结论:
步骤:
MyFirstFilter.java
package com.example.servlet.myfilter;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
/**
* 基于@WebFilter注解整合Filter方式一
*/
@WebFilter(filterName = "MyFirstFilter",urlPatterns = "/myFirst")
public class MyFirstFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException {
System.out.println("进入Filter中了.....");
arg2.doFilter(arg0,arg1);
System.out.println("离开Filter了.......");
}
@Override
public void destroy() {
}
}
ServletApplication.java
package com.example.servlet;
import com.example.servlet.myservlet.SecondServlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
@ServletComponentScan //在springBoot启动时会扫描@WebServlet,并将该类实例化
public class ServletApplication {
public static void main(String[] args) {
SpringApplication.run(ServletApplication.class, args);
}
/**
* 整合Servlet的第二种方式,创建ServletRegistrationBean并添加路径
* @return
*/
@Bean
public ServletRegistrationBean getServletRegistrationBean(){
ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());
bean.addUrlMappings("/mySecond");
return bean;
}
}
步骤:
MySecondFilter.java
package com.example.servlet.myfilter;
import javax.servlet.*;
import java.io.IOException;
/**
* 整合Filter的第二种方式
*/
public class MySecondFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException {
System.out.println("进入MySecondFilter了......");
arg2.doFilter(arg0, arg1);
System.out.println("离开MySecondFilter了......");
}
@Override
public void destroy() {
}
}
ServletApplication.java
package com.example.servlet;
import com.example.servlet.myfilter.MySecondFilter;
import com.example.servlet.myservlet.SecondServlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
//@ServletComponentScan //在springBoot启动时会扫描@WebServlet,并将该类实例化
public class ServletApplication {
public static void main(String[] args) {
SpringApplication.run(ServletApplication.class, args);
}
/**
* 整合Filter的第二种方式
* 注册Filter
*/
@Bean
public FilterRegistrationBean getFilterRegistrationBean() {
FilterRegistrationBean bean = new FilterRegistrationBean(new MySecondFilter());
// bean.addUrlPatterns(new String[]{"*.do","*.jsp"});//拦截多个时
bean.addUrlPatterns("/mySecond");
return bean;
}
}
然后在浏览器访问localhost:8080/mySecond,就可以看到控制台打印如下
步骤:
package com.example.servlet.mylistener;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
/**
* springBoot 整合Listener第一种方式
* 创建一个Servlet上下文的监听器
* @WebListener 自动注册,相当于在web.xml中添加如下代码
*
*
* ah.szxy.listener.FirstListener
*
*/
@WebListener
public class MyFirstListener implements ServletContextListener {
@Override
public void contextDestroyed(ServletContextEvent arg0) {
// TODO Auto-generated method stub
System.out.println("MyFirstListener执行销毁了。。。");
}
@Override
public void contextInitialized(ServletContextEvent arg0) {
// TODO Auto-generated method stub
System.out.println("MyFirstListener执行初始化了。。。");
}
}
执行项目会打印如下,因为用了@ServletComponentScan注解,在项目启动的时候就会扫描包中是否含有servlet,若有就初始化。由于FirstServlet是基于注解初始化的,所以在项目启动的时候,就会执行初始化servlet,被Listener监听到
步骤:
package com.example.servlet.mylistener;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
/**
* 整合Listener的第二种方式
*/
public class MySecondListener implements ServletContextListener {
@Override
public void contextDestroyed(ServletContextEvent arg0) {
// TODO Auto-generated method stub
System.out.println("MySecondListener执行销毁了。。。");
}
@Override
public void contextInitialized(ServletContextEvent arg0) {
// TODO Auto-generated method stub
System.out.println("MySecondListener执行初始化了。。。");
}
}
package com.example.servlet;
import com.example.servlet.myfilter.MySecondFilter;
import com.example.servlet.mylistener.MySecondListener;
import com.example.servlet.myservlet.SecondServlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
@ServletComponentScan //在springBoot启动时会扫描@WebServlet,并将该类实例化
public class ServletApplication {
public static void main(String[] args) {
SpringApplication.run(ServletApplication.class, args);
}
/**
* 注册listener
*/
@Bean
public ServletListenerRegistrationBean getServletListenerRegistrationBean() {
ServletListenerRegistrationBean bean = new ServletListenerRegistrationBean(
new MySecondListener());
return bean;
}
}
执行项目,在控制台可以看到输出如下,两个Servlet监听器都执行了
总的项目目录包结构如下:
更多资源和教程请关注公众号:非科班的科班。
如果觉得我写的还可以请给个赞,谢谢大家,你的鼓励是我创作的动力
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解答本文疑问/技术咨询/运营咨询/技术建议/互联网交流