Servlet的基本使用

 1、pom.xml导入包

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>RELEASE</version>
    <scope>compile</scope>
</dependency>

2、继承HttpServlet类，重写需要的方法

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
      
    }

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

3、在web.xml中申明

<servlet>
    <!--自定义名称-->
  <servlet-name>HelloServlet</servlet-name>
    <!--关联类-->
  <servlet-class>com.doubleh.servlet.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
    <!--映射对应的servlet-->
  <servlet-name>HelloServlet</servlet-name>
    <!--路由地址-->
  <url-pattern>/hello</url-pattern>
</servlet-mapping>