SpringBoot--添加配置Servlet,Filter,listener

SpringBoot--添加配置Servlet,Filter,listener

         SpringBoot中已经移除了web.xml文件，如果需要添加注册Servlet，Filter，Listener，则SpringBoot中有2种方式：

         1、Servlet3.0api中的注解@WebServlet 、@WebListener、@WebFilter来配置

         2、SpringBoot配置bean的方式进行配置

这里就详细介绍SpringBoot配置Bean的方式进行配置，

1.创建maven简单工程，加入SpringBoot框架

2.创建TestServlet，TestFilter，TestListener类，如下：

package com.supre.springboot.test;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TestServlet extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		resp.getWriter().print("hello word");
		resp.getWriter().flush();
		resp.getWriter().close();
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		this.doGet(req, resp);
	}

}

package com.supre.springboot.test;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class TestFilter implements Filter {

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		System.out.println("doFilter");
		arg2.doFilter(arg0, arg1);
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		
	}

}

package com.supre.springboot.test;

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

public class TestListener implements ServletContextListener {

	@Override
	public void contextDestroyed(ServletContextEvent arg0) {
		// TODO Auto-generated method stub
		System.out.println("listener destroy");
	}

	@Override
	public void contextInitialized(ServletContextEvent arg0) {
		// TODO Auto-generated method stub
		System.out.println("listener init");
	}

}

3、在SpringBoot的启动类中，添加如下Bean配置，启动类如下

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package com.supre.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.embedded.FilterRegistrationBean;
import org.springframework.boot.context.embedded.ServletListenerRegistrationBean;
import org.springframework.boot.context.embedded.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;

import com.supre.springboot.test.TestListener;
import com.supre.springboot.test.TestServlet;

@SpringBootApplication
public class App{
	
    public static void main( String[] args ){
        System.out.println( "Hello World!" );
        //ApplicationContext app = SpringApplication.run(App.class, args);
        //SpringContextUtil.setApplicationContext(app);
        SpringApplication.run(App.class, args);
    }
    
    @Bean
    public ServletRegistrationBean testServletRegistration() {
        ServletRegistrationBean registration = new ServletRegistrationBean(new TestServlet());
        registration.addUrlMappings("/hello");
        return registration;
    }

    @Bean
    public FilterRegistrationBean testFilterRegistration() {
        FilterRegistrationBean registration = new FilterRegistrationBean(new TestFilter());
        registration.addUrlPatterns("/");
        return registration;
    }
    
    @Bean
    public ServletListenerRegistrationBean<TestListener> testListenerRegistration(){
        ServletListenerRegistrationBean<TestListener> registration = new ServletListenerRegistrationBean<TestListener>(new TestListener());
        return registration;
    }

}

4、运行该SpringBoot启动类中的main方法，访问http://localhost:8080/hello,查看控制台的打印信息，确认是否注册完成。