springboot整合servlet

在idea新建项目

这个是pom.xml文件需要添加的依赖包

<properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

新建一个servlet包

在这个包下面新建FirstServlet类

FirstServlet.java 类

package com.example.gong02.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;

/*
   * 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("FistServlet..........");

    }
}

编写启动类

App.java类

package com.example.gong02;

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 启动时会扫描@WebServlet， 并将该类实例化 

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

运行App.java

在浏览器输入

终端打印

下面介绍servlet的第二种整合方式

新建SecondServlet类

package com.example.gong02.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 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.......");
    }
}

编写启动类App2.java

App2.java类

package com.example.gong02;

import com.example.gong02.servlet.SecondServlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;

/**
 * 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;
    }
}

运行

在浏览器输入

可以看到终端打印出来了

注意了，大家在运行方式二的时候可能会出现8080端口被占用的情况导致tomcat无法启动，遇到这种情况可以重启一下idea就能解决了