[JAVA]SpringBoot整合Servlet

JAVA java

创建时间:2019-10-22 22:34

字数:477 阅读:

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1.注解扫描
2.通过编写一个方法

Spring Boot整合Servlet有两种方式。

1.通过注解扫描.

2.通过编写一个方法.

1.注解扫描

以前我们在web写select，需要在web.xml配置<servlet></servlet>和<servlet-mapping></servlet-mapping>等信息。那么使用springboot不必了。

AnnotationServlet.java

这里我们设置的路径是/hello

package xyz.xioaxin12.springboot01servlet.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(name="AnnotationServlet",urlPatterns = "/hello")
public class AnnotationServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setCharacterEncoding("UTF-8");
        resp.setContentType("text/html;charset=utf-8");
        resp.getWriter().append("这是springboot整合servlet注解的方式!");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.doPost(req, resp);
    }
}

SpringBoot01ServletApplication.java

启动类，这里能看到加了@ServletComponentScan注解，它会自动注册带有@WebServlet的注解。

package xyz.xioaxin12.springboot01servlet;

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

@SpringBootApplication
@ServletComponentScan
public class SpringBoot01ServletApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringBoot01ServletApplication.class, args);
    }

}

由于我的8080被占用了，我在application.properties修改成8081端口。

server.port=8081

启动访问localhost:8081/hello

2.通过编写一个方法

为了测试明显，不在原类上修改，重写一个servlet与启动类。

DeployServlet.java

去除了注解。

package xyz.xioaxin12.springboot01servlet.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 DeployServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setCharacterEncoding("UTF-8");
        resp.setContentType("text/html;charset=utf-8");
        resp.getWriter().append("这是springboot整合servlet另一种方式!");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.doPost(req, resp);
    }
}

SpringBoot01ServletApplication2.java

一定要添加@Bean

package xyz.xioaxin12.springboot01servlet;

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 xyz.xioaxin12.springboot01servlet.servlet.DeployServlet;

@SpringBootApplication
public class SpringBoot01ServletApplication2 {

    public static void main(String[] args) {
        SpringApplication.run(SpringBoot01ServletApplication2.class, args);
    }

    @Bean
    public ServletRegistrationBean getRegistrationBean(){
        ServletRegistrationBean bean = new ServletRegistrationBean(new DeployServlet());
        bean.addUrlMappings("/hello2");
        return bean;
    }

}

启动访问localhost:8081/hello2

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