ava中servlet类，首先建一个包cn.java.servlet,同样建一个cn.java.entity的包用来建立实体类。

本节是Java-web阶段第52课时，通过继承servlet类实现了，从浏览器端发送请求到服务器（这时候在console输出了hello servlet），然后通过输出流向外输出红色字体（hello servlet））。这时候从浏览器发送请求用的是doGet方法。HttpServletRequest和HttpServletRequest可以看成是特殊的实体类，即平时所看见的request方法和response方法。

package cn.java.Servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.ServletOutputStream;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.xml.ws.Response;

@WebServlet("/aaa")

public class HomeServlet extends HttpServlet{

@Override

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

System.out.println("hello servlet");

String str="<h1 style='color:red'>hello servlet</h1>";

ServletOutputStream so=response.getOutputStream();

so.write(str.getBytes("utf-8"));

}

@Override

protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

// TODO Auto-generated method stub

super.doPost(req, resp);

}

}