Servlet认识，servlet小程序，doGet，doPost

创建servlet小程序：

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<h1>servlet</h1>

<hr>
<a href="com.servlet/Servlet">Get方式请求HelloServlet</a>
<form action="com.servlet/Servlet" method="post">
<input type="submit" value="Post方式请求HelloServlet"> 
</form>
</body>
</html>

创建类，继承HTTPServlet

重写doGet，doPost方法

package com.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;

//继承与HttpServlet
public class Servlet extends HttpServlet
{

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        // TODO Auto-generated method stub
       System.out.println("处理Get()请求。。。。。");
       PrintWriter out=response.getWriter();
       response.setContentType("text/html;charset=utf-8");//设置字符集，否则会输出<string>等标签代码
       out.println("<strong>Hello Servlet</strong><br>");
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        // TODO Auto-generated method stub
        System.out.println("处理Post()请求。。。。。");
        PrintWriter out=response.getWriter();
        response.setContentType("text/html;charset=utf-8");//设置字符集，否则会输出<string>等标签代码
        out.println("<strong>Hello Servlet</strong><br>");
    }
    
    
}

在web.xml中注册

 <servlet>
      <servlet-name>HelloServlet</servlet-name>
      <servlet-class>com.servlet.Servlet</servlet-class>
      
      
  </servlet>
  <servlet-mapping>
      <servlet-name>HelloServlet</servlet-name>
      <url-pattern>/com.servlet/Servlet</url-pattern>
      
  </servlet-mapping>