SpringBoot----整合 Servlet

一.通過註解掃描完成 Servlet 組件的註冊

1.1 編寫 servlet

package com.bjsxt.servlet;

import java.io.IOException;

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


/**
 *SpringBoot整合Servlet方式一
 *
 *<servlet>
 *	<servlet-name>FirstServlet</servlet-name>
 *	<servlet-class>com.bjsxt.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 {
		System.out.println("FirstServlet............");
	}
}

1.2 編寫啓動類

package com.bjsxt;

import javax.servlet.annotation.WebServlet;

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
 *
 *
 */
@SpringBootApplication
@ServletComponentScan //在springBoot啓動時會掃描@WebServlet，並將該類實例化
public class App {

	public static void main(String[] args) {
		SpringApplication.run(App.class, args);
	}

}

二.通過方法完成 Servlet 組件的註冊

2.1 編寫 servlet

package com.bjsxt.servlet;

import java.io.IOException;

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

/**
 *SpringBoot整合Servlet方式二
 *
 */

public class SecondServlet extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		System.out.println("SecondServlet..........");
	}
	
}

2.2 編寫啓動類

package com.bjsxt;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;

import com.bjsxt.servlet.SecondServlet;

/**
 * SpringBoot整合Servlet方式二
 *
 *
 */
@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("/second");
		return bean;
	}
}