servlet入门

package com;

import java.io.IOException;

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

public class HelloWorldServlet extends HttpServlet{
    //封装了客户端到服务器端的请求 ，当客户从URL中输入地址时，自动调用该方法。dopost为当提交数据时调用该方法
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        //super.doGet(req, resp);
        System.out.println("doGet");
    }
}

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
  version="3.0"
  metadata-complete="true">
 
    <servlet>
        <servlet-name>hello</servlet-name>
        <servlet-class>com.HelloWorldServlet</servlet-class>  //注意com包，且在classess文件中也应该有com这个文件夹
    </servlet>
   
    <servlet-mapping>
        <servlet-name>hello</servlet-name>
        <url-pattern>/abc</url-pattern>   //地址栏中的文件名
    </servlet-mapping>

<!-- JSPC servlet mappings start -->

 

<!-- JSPC servlet mappings end -->

</web-app>

 

 

部署好后，可以直接调用class文件。