欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

SpringBoot学习笔记11-SpringBoot 中使用 Servlet

程序员文章站 2022-07-13 13:37:01
...

可以通过2中方式实现:
方式一,通过注解方式实现;

1、使用Servlet3的注解方式编写一个Servlet
创建servlet包
编写MyServlet

package com.springboot.web.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;

@WebServlet(urlPatterns="/myServlet")
public class MyServlet extends HttpServlet {
    private static final long serialVersionUID = -4134217146900871026L;
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().print("hello word");
        resp.getWriter().flush();
        resp.getWriter().close();
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req, resp);
    }
}

2、在main方法的主类上添加注解:
@ServletComponentScan(basePackages=“com.springboot.web.servlet”)

package com.springboot.web;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;

@SpringBootApplication
@ServletComponentScan(basePackages="com.springboot.web.servlet")
public class SpringbootWebApplication {

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

}

测试:
【http://localhost:8080/myServlet】
输出:my servlet , hello word
运行截图如下:
SpringBoot学习笔记11-SpringBoot 中使用 Servlet

方式二,通过Spring boot的配置类实现;
1、编写一个普通的Servlet(可以看到并没有配置注解)

package com.springboot.web.servlet;

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

public class HeServlet extends HttpServlet {
    private static final long serialVersionUID = -4134217146900871026L;
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().print("hello word");
        resp.getWriter().flush();
        resp.getWriter().close();
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req, resp);
    }
}

2、编写一个Springboot的配置类;

package com.springboot.web.config;

import com.springboot.web.servlet.HeServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/** springboot没有xml , @Configuration可以表示一个spring的配置文件,比如:applicationContext.xml */
@Configuration //一定要加上这个注解,成为Springboot的配置类,不然不会生效
public class ServletConfig {

	@Bean //这个注解就将这个ServletRegistrationBean变成一个Spring的bean类。
	public ServletRegistrationBean heServletRegistrationBean(){
		ServletRegistrationBean registration = new ServletRegistrationBean(new HeServlet(), "/heServlet");
		return registration;
	}

}

测试:
【http://localhost:8080/heServlet】
输出:he servlet , hello word
运行截图如下:
SpringBoot学习笔记11-SpringBoot 中使用 Servlet