1、註冊Servlet
ServletRegistrationBean
1.1 編寫自己的Servlet類
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* @author linchong
* @create 2019-03-25 16:12
*/
public class MyServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req,resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.getWriter().write("hello myServlet!");
}
}
1.2 配置注入Servlet
import com.atguigu.springboot.servlet.MyServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* @author linchong
* @create 2019-03-25 16:14
*/
@Configuration
public class MyServerConfig {
//註冊三大組件之Servlet
@Bean
public ServletRegistrationBean myServlet() {
ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new MyServlet(),"/myServlet");
return servletRegistrationBean;
}
}
測試:
2、註冊Filter
FilterRegistrationBean
2.1 編寫自定義Filter
package com.atguigu.springboot.filter;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;
import javax.servlet.*;
import java.io.IOException;
/**
* @author linchong
* @create 2019-03-25 16:36
*/
public class MyFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void destroy() {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println("filter執行。。。");
filterChain.doFilter(servletRequest, servletResponse);
}
}
2.2 註冊filter
package com.atguigu.springboot.config;
import com.atguigu.springboot.filter.MyFilter;
import com.atguigu.springboot.servlet.MyServlet;
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;
/**
* @author linchong
* @create 2019-03-25 16:14
*/
@Configuration
public class MyServerConfig {
//註冊三大組件之Filter
@Bean
public FilterRegistrationBean myFilter() {
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
filterRegistrationBean.setFilter(new MyFilter());
filterRegistrationBean.setUrlPatterns(Arrays.asList("/hello","/myServlet"));
return filterRegistrationBean;
}
}
測試:
可以看到filter執行了,並且是在Servlet執行之前攔截請求~
3、註冊Listener
ServletListenerRegistrationBean
3.1 自定義Listener
package com.atguigu.springboot.listener;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
/**
* @author linchong
* @create 2019-03-25 16:49
*/
public class MyListener implements ServletContextListener {
@Override
public void contextInitialized(ServletContextEvent sce) {
System.out.println("contextInitialized應用啓動....");
}
@Override
public void contextDestroyed(ServletContextEvent sce) {
System.out.println("contextInitialized應用銷燬");
}
}
3.2 配置注入listener
package com.atguigu.springboot.config;
import com.atguigu.springboot.filter.MyFilter;
import com.atguigu.springboot.listener.MyListener;
import com.atguigu.springboot.servlet.MyServlet;
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;
/**
* @author linchong
* @create 2019-03-25 16:14
*/
@Configuration
public class MyServerConfig {
//註冊三大組件之Listener
@Bean
public ServletListenerRegistrationBean myListener() {
ServletListenerRegistrationBean<MyListener> myListenerServletListenerRegistrationBean = new ServletListenerRegistrationBean<>(new MyListener());
return myListenerServletListenerRegistrationBean;
}
}
測試:
本文內容來自尚硅谷雷豐陽老師