springboot2.0 使用servlet 、filter、listener
使用servlet、filter、listener、采用在主配置类中注册类的方式，用@Bean注解
package com.springboot2.thyemleaf;
import com.springboot2.thyemleaf.fileter.MyFilter;
import com.springboot2.thyemleaf.fileter.MyFilter2;
import com.springboot2.thyemleaf.lisener.Mylistener;
import com.springboot2.thyemleaf.servlet.MyServlet;
import com.springboot2.thyemleaf.servlet.MyServlet2;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
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;
@SpringBootApplication
public class ThyemleafdemoApplication {
public static void main(String[] args) {
SpringApplication.run(ThyemleafdemoApplication.class, args);
}
// 在主类采用bean方法注册
@Bean
public ServletRegistrationBean getServlet1(){
return new ServletRegistrationBean(new MyServlet(),"/my1");
}
@Bean
public ServletRegistrationBean getServlet2(){
return new ServletRegistrationBean(new MyServlet2(),"/my2");
}
@Bean
public FilterRegistrationBean getFilter(){
//过滤所有请求
// return new FilterRegistrationBean(new MyFilter());
// 过滤指定的servlet
return new FilterRegistrationBean(new MyFilter(),getServlet1());
}
@Bean
public FilterRegistrationBean getFilter2(){
// 过滤多个指定的servlet
return new FilterRegistrationBean(new MyFilter2(),getServlet2(),getServlet1());
}
@Bean
public ServletListenerRegistrationBean getListener(){
return new ServletListenerRegistrationBean<>(new Mylistener());
}
}
类：servlet
package com.springboot2.thyemleaf.servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* Created by lpw'ASUS on 2018/5/28.
*/
public class MyServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req,resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("这是自己写的servlet");
}
}
filter:
package com.springboot2.thyemleaf.fileter;
import javax.servlet.*;
import java.io.IOException;
/**
* Created by lpw'ASUS on 2018/5/28.
*/
public class MyFilter 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("这是我的拦截器------");
filterChain.doFilter(servletRequest,servletResponse);
}
@Override
public void destroy() {
}
}
listener:
package com.springboot2.thyemleaf.lisener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
/**
* Created by lpw'ASUS on 2018/5/29.
*/
public class Mylistener implements HttpSessionListener{
@Override
public void sessionCreated(HttpSessionEvent httpSessionEvent) {
System.out.println("MyListener sessionCreated-----");
}
@Override
public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
System.out.println("MyListener sessionDestroyed-----");
}
}
2. 通过实现
主配置类，实现servletContextInitializer，重写onStartup。
@Override
public void onStartup(ServletContext servletContext) throws ServletException {
servletContext.addServlet("my1",MyServlet.class).addMapping("/my1");
servletContext.addFilter("myfilter1",MyFilter.class).addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST),true,"/*");
servletContext.addListener(Mylistener.class);
}3.通过注解
在主配置配上加@ServletCompanentScan注解
package com.springboot2.thyemleaf;
import com.springboot2.thyemleaf.fileter.MyFilter;
import com.springboot2.thyemleaf.fileter.MyFilter2;
import com.springboot2.thyemleaf.lisener.Mylistener;
import com.springboot2.thyemleaf.servlet.MyServlet;
import com.springboot2.thyemleaf.servlet.MyServlet2;
import org.apache.tomcat.util.net.DispatchType;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.*;
import org.springframework.context.annotation.Bean;
import javax.servlet.DispatcherType;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.xml.ws.Dispatch;
import java.util.EnumSet;
@SpringBootApplication
@ServletComponentScan
public class ThyemleafdemoApplication {
public static void main(String[] args) {
SpringApplication.run(ThyemleafdemoApplication.class, args);
}
}
在servlet上加@Webservlet注解
package com.springboot2.thyemleaf.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;
/**
* Created by lpw'ASUS on 2018/5/28.
*/
@WebServlet(urlPatterns = "/my1")
public class MyServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("这是自己写的servlet get");
req.getSession().setAttribute("mydemo","张三");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("这是自己写的servlet");
req.getSession().setAttribute("mydemo","张三");
}
}
在filter上加@WebFilter注解
package com.springboot2.thyemleaf.fileter;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
/**
* Created by lpw'ASUS on 2018/5/28.
*/
@WebFilter(urlPatterns = "/*")
public class MyFilter 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("这是我的拦截器------");
filterChain.doFilter(servletRequest,servletResponse);
}
@Override
public void destroy() {
}
}
在listener上加@WebListener注解
package com.springboot2.thyemleaf.lisener;
import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
/**
* Created by lpw'ASUS on 2018/5/29.
*/
@WebListener
public class Mylistener implements HttpSessionListener{
@Override
public void sessionCreated(HttpSessionEvent httpSessionEvent) {
System.out.println("MyListener sessionCreated-----");
}
@Override
public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
System.out.println("MyListener sessionDestroyed-----");
}
}