注解方式实现Servlet

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我是靠谱客的博主动听手套，最近开发中收集的这篇文章主要介绍注解方式实现Servlet，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

注解方式实现Servlet

1.Servlet3.0
Servlet3.0新增了一些注解，用来简化的javaweb代码开发:
可以省略web.xml配置文件
支持异步处理（多线程技术）
支持可插性特性（书写的代码编译后生成的class文件可以直接部署到其他项目的，自动加载执行）

2.具体实现

package test;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = "/zj")
public class ZhuServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("你好呀");
    }
}

3.severlet获取多个值
使用getParameterValues方法

<%--
  Created by IntelliJ IDEA.
  User: shenh
  Date: 2020/6/6
  Time: 14:48
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>多个值</title>
</head>
<body>
    <form action="/web01/hobby" method="post">
         用户名：<input type="text" name="username" value="jack" /> <br/>
         密码：<input type="text" name="password" value="1234" /> <br/>
         爱好：<input type="checkbox" name="hobby" value="smoke" checked="checked"/> 抽烟
          <input type="checkbox" name="hobby" value="drink" checked="checked" /> 喝酒
          <input type="checkbox" name="hobby" value="head" /> 烫头  <br/>
          <input type="submit" value="post提交" />
    </form>
</body>
</html>

package test;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(urlPatterns = "/hobby")
public class MyHobby extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String username = request.getParameter("username");
        System.out.println(username);

        String password = request.getParameter("password");
        System.out.println(password);

        String[] hobbies = request.getParameterValues("hobby");
        for (String temp:hobbies) {
            System.out.println(temp);
        }
    }
}