SpringBoot整合Servlet的两种方式

灰太狼 2022-01-10 00:57 586阅读 0赞

1.创建maven项目，导入springboot的maven依赖  
pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
       <parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>1.5.2.RELEASE</version>
    	</parent>
    
      <groupId>per.czt.02-spring-boot-servlet</groupId>
      <artifactId>02-spring-boot-servlet</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <packaging>jar</packaging>
    
      <name>02spring-boot-servlet</name>
      <url>http://maven.apache.org</url>
    
      <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.7</java.version>
      </properties>
    
      <dependencies>
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>3.8.1</version>
          <scope>test</scope>
        </dependency>
        
      
        
        
        
        <dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
      </dependencies>
    </project>

2.编写servlet  
方式一：通过注解扫描完成servlet组件的注册  
FirstServlet.Class

package per.czt.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;
    //web.xml配置servlet
    /*
     * <servlet>
     * 		<servlet-name>FirstServlet</servlet-name>
     * 		<servlet-class>per.czt.servlet.FirstServlet</servlet-class>
     * 
     * </servlet>
     * <servlet-mapping>
     * 	  <servlet-name>FirstServlet</servlet-name>
     * 	  <url-patten>/first</url-patten>
     * 
     * </servlet-mapping>
     */
    //SpringBoot整合servlet
    //通过注解扫描完成servlet组件的注册
    @WebServlet(urlPatterns="/first",name="FirstServlet")
    public class FirstServlet extends HttpServlet {
    	@Override
    	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		
    		this.doGet(req, resp);
    		
    	}
    
    	@Override
    	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		System.out.println("Hello,servlet!");
    		PrintWriter pw=resp.getWriter();
    		pw.println("Hello,servlet!");
    		}
    }

启动类 App.Class

package per.czt.servlet;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    
    /**
     * Hello world!
     *
     */
    @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);
          
        }
    }

方式：通过编写ServletRegistrationBean的方法的方式  
SecondServlet.Class

package per.czt.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 SecondServlet extends HttpServlet {
    	@Override
    	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		
    		this.doGet(req, resp);
    		
    	}
    
    	@Override
    	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		System.out.println("Hello,servlet2!");
    		PrintWriter pw=resp.getWriter();
    		pw.println("Hello,servlet2!");
    		}
    
    }

启动类

package per.czt.servlet;
    
    import javax.servlet.ServletRegistration;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletRegistrationBean;
    import org.springframework.context.annotation.Bean;
    
    @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;
    	}
    
    }