servlet内存马学习

项目配置


注意一定要添加

否则访问路径会404，tomcat并没有对项目生效

1.实现javax.servlet.Servlet接口的方式

Servlet.class：

package org.test;

import javax.servlet.*;
import java.io.IOException;

public class ServletTest implements Servlet {
   
   
    @Override
    public void init(ServletConfig servletConfig) throws ServletException {
   
   
        System.out.println("init");
    }

    @Override
    public ServletConfig getServletConfig() {
   
   
        return null;
    }

    @Override
    public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
   
   
        System.out.println("service");
    }

    @Override
    public String getServletInfo() {
   
   
        return null;
    }

    @Override
    public void destroy() {
   
   
        System.out.println("destroy");
    }
}

web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <servlet>
        <servlet-name>demo1</servlet-name>
        <servlet-class>org.test.ServletTest</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>demo1</servlet-name>
        <url-pattern>/demo1</url-pattern>
    </servlet-mapping>
</web-app>

pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<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>

    <groupId>org.example</groupId>
    <artifactId>servlet_ncm</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-core</artifactId>
            <version>8.5.43</version>
        </dependency>

    </dependencies>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

</project>

效果：
启动后，访问url，可以看到成功输出init和service

停止后，可以看到输出destroy

注解的方式：

package org.test;

import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import java.io.IOException;

@WebServlet("/demo1")
public class ServletTest implements Servlet {
   
   
    @Override
    public void init(ServletConfig servletConfig) throws ServletException {
   
   
        System.out.println("init");
    }

    @Override
    public ServletConfig getServletConfig() {
   
   
        return null;
    }

    @Override
    public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
   
   
        System.out.println("service");
    }

    @Override
    public String getServletInfo() {
   
   
        return null;
    }

    @Override
    public void destroy() {
   
   
        System.out.println("destroy");
    }
}

2.继承GenericServlet类创建Servlet

以下全是注解形式来看

package org.test;

import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import java.io.IOExcept