javaWeb第一天

//第一个JavaWeb项目
package com.chy.action;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//继承HttpServlet类重写server方法
public class HelloServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {
		System.out.println("hello Servlet!!");
		resp.getWriter().println("<h1>Hello Servlet</h1>");
	}

}

//修改web.xml文件配置
//srvlet下
//<servlet-name>first</servlet-name>first是设置web项目的唯一名
//<servlet-class>com.chy.action.HelloServlet</servlet-class>通知服务器在哪里找到包名
//servlet-mapping下
//<servlet-name>first</servlet-name>映射web项目的唯一包名
//<url-pattern>/chy</url-pattern>映射进行访问时通过何种地址访问

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
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_2_5.xsd">
<servlet>
　　<servlet-name>first</servlet-name>
　　<servlet-class>com.chy.action.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
　　<servlet-name>first</servlet-name>
　　<url-pattern>/chy</url-pattern>
</servlet-mapping>
<welcome-file-list>
　　<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>