转自：
在spring boot中添加自己的Servlet有两种方法，代码注册Servlet和注解自动注册（Filter和Listener也是如此）。
【1】手动注册servlet
一、代码注册通过ServletRegistrationBean 获得控制。 也可以通过实现 ServletContextInitializer 接口直接注册。
package com.kerry.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MyServlet1 extends HttpServlet{
private static final long serialVersionUID = 8031133938454140403L;
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
resp.setContentType("text/html");
PrintWriter out = resp.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Hello World</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>welcome this is my servlet1!!!</h1>");
out.println("</body>");
out.println("</html>");
}
}package com.kerry.configure;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.kerry.servlet.MyServlet;
import com.kerry.servlet.MyServlet1;
@Configuration
public class ServletConfigure {
/**
* 代码注册servlet(不需要@ServletComponentScan注解)
* @return
*/
@Bean
public ServletRegistrationBean servletRegistrationBean() {
return new ServletRegistrationBean(new MyServlet1(), "/servlet/myServlet1");// ServletName默认值为首字母小写，即myServlet1
}
/**
* 多个servlet就注册多个bean
* @return
*/
@Bean
public ServletRegistrationBean servletRegistrationBean1() {
return new ServletRegistrationBean(new MyServlet(), "/servlet/myServlet");// ServletName默认值为首字母小写，即myServlet
}
}【2】使用WebServlet 注解
1 Application上加上@ServletComponentScan注解
package com.kerry;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@SpringBootApplication
@MapperScan("com.kerry.mapper")
@ServletComponentScan
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}2 servlet上加上@WebServlet注解
package com.kerry.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 注解使用servlet 需要在Application上加入 @ServletComponentScan
* @author Administrator
*
*/
@WebServlet(name="myServlet",urlPatterns="/servlet/myServlet")
public class MyServlet extends HttpServlet{
private static final long serialVersionUID = 8031133938454140403L;
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
resp.setContentType("text/html");
PrintWriter out = resp.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Hello World</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>welcome this is my servlet!!!</h1>");
out.println("</body>");
out.println("</html>");
}
}3） 附上项目结构
