002 Servlet 第一个程序

1. 创建一个JavaWEB项目

2. 新建一个Java类，让这个类继承javax.servlet.http.HttpServlet.

3. 在重写doGet和doPost方法

4. 在doGet或者doPost中编写业务代码

5. 在web.xml中注册Servlet

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 ServletDemo extends HttpServlet {

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

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }
}

1 <servlet>
2         <servlet-name>servletDemo</servlet-name>
3         <servlet-class>com.qc.airquality.web.ServletDemo</servlet-class>
4     </servlet>
5     <servlet-mapping>
6         <servlet-name>servletDemo</servlet-name>
7         <url-pattern>/servletAction</url-pattern>
8     </servlet-mapping>