Servlet 入门（第三章）

第三章 注解配置Servlet

3-1 注解简化配置

1. 介绍

2. 代码示例

package com.imooc.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//注解中加入映射地址，xml文件则无需配置
@WebServlet("/anno")
public class AnnotationServlet extends HttpServlet{

	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		resp.getWriter().println("I");
	}
	
}

3-2 启动时加载Servlet

1. 介绍

2. 注解写法

@WebServlet(urlPatterns="/unused",loadOnStartup=2)