Redis实现手机验证码校验 - 缓存 - 进阶 | Dabing = = 笔记空间

# 目标 - 完成一个手机验证码功能

要求：
1、输入手机号，点击发送后随机生成 6 位数字码，2 分钟有效
2、输入验证码，点击验证，返回成功或失败
3、每个手机号每天只能输入 3 次

实现：

# 前端代码：

	<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8">
	<title>Insert title here</title>
	<script src="static/jquery/jquery-3.1.0.js" ></script>
	<link href="static/bs/css/bootstrap.min.css" rel="stylesheet" />
	<script src="static/bs/js/bootstrap.min.js" ></script>

	</head>
	<body>
	<div class="container">
	<div class="row">
	<div id="alertdiv" class="col-md-12">
	<form class="navbar-form navbar-left" role="search" id="codeform">
	<div class="form-group">
	<input type="text" class="form-control" placeholder="填写手机号" name="phone_no">
	<button type="button" class="btn btn-default" id="sendCode">发送验证码</button><br>
	<font id="countdown" color="red" ></font>
	<br>
	<input type="text" class="form-control" placeholder="填写验证码" name="verify_code">
	<button type="button" class="btn btn-default" id="verifyCode">确定</button>
	<font id="result" color="green" ></font><font id="error" color="red" ></font>
	</div>
	</form>
	</div>
	</div>
	</div>

	</body>
	<script type="text/javascript">
	var t=120;// 设定倒计时的时间
	var interval;
	function refer(){
	$("#countdown").text("请于"+t+"秒内填写验证码 "); // 显示倒计时
	t--; // 计数器递减
	if(t<=0){
	clearInterval(interval);
	$("#countdown").text("验证码已失效，请重新发送！ ");
	}
	}

	$(function(){
	$("#sendCode").click( function () {

	$.post("SendCodeServlet",$("#codeform").serialize(),function(data){
	if(data=="true"){
	t=120;
	clearInterval(interval);
	interval= setInterval("refer()",1000);// 启动 1 秒定时
	}else if (data=="limit"){
	clearInterval(interval);
	$("#countdown").text("单日发送超过次数！ ")
	}
	});
	});

	$("#verifyCode").click( function () {

	$.post("CheckCodeServlet",$("#codeform").serialize(),function(data){
	if(data=="true"){
	$("#result").attr("color","green");
	$("#result").text("验证成功");
	clearInterval(interval);
	$("#countdown").text("")
	}else{
	$("#result").attr("color","red");
	$("#result").text("验证失败");
	}
	});
	});


	});
	</script>
	</html>

# 后端代码：

点击发送验证码时：

将数据存入 redis 中

	package com.dabing.redis.servlet;

	import redis.clients.jedis.Jedis;

	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;
	import java.time.Duration;
	import java.time.LocalTime;
	import java.util.Random;

	// 处理发送验证码的 Servlet
	@WebServlet("/SendCodeServlet")
	public class SendCodeServlet extends HttpServlet {
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	String phoneNo = request.getParameter("phone_no");
	if(phoneNo==null \|\| "".equals(phoneNo)){
	return;
	}
	Jedis jedis = new Jedis("xxx.xxx.xx.xx",6379);
	String countKey=phoneNo+":count"; // 生成验证码的次数 key
	String codeKey=phoneNo+":code"; // 手机验证码 key
	String count = jedis.get(countKey);
	String code=getCode(6);
	System.out.println("code="+code);
	if(count==null){
	// 证明没有发送过验证码
	// 保存验证码到 redis，过期时间 120 秒
	jedis.setex(codeKey,120,code);
	// 设置过期时间为今天的剩余时间
	jedis.setex(countKey,(int)getTheLeftSeconds(),"1");
	response.getWriter().write("true");
	}else if ("3".equals(count)){
	// 证明已经发送过 3 次了
	response.getWriter().write("limit");
	return;// 返回不让发了
	}else {
	// 证明已经发过，但是次数没达到 3 次
	jedis.setex(codeKey,120,code);
	jedis.incr(countKey);// 次数加 1
	response.getWriter().write("true");
	}
	jedis.close();
	}

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

	// 随机生成验证码的方法
	private String getCode(int len) {
	String code = "";
	for (int i = 0; i < len; i++) {
	int rand = new Random().nextInt(10);
	code += rand;
	}
	return code;
	}

	// 获取当天剩余秒数的方法
	private long getTheLeftSeconds(){
	// 获取现在的时间
	LocalTime now = LocalTime.now();
	// 获取当日 23 点 59 分 59 秒的时间
	LocalTime end = LocalTime.of(23, 59, 59);
	// 获取 end 与 now 相差的秒数
	long millis = Duration.between(now, end).toMillis()/1000;
	return millis;
	}
	}

输入验证码校验时

从 redis 中取出对比

	package com.dabing.redis.servlet;

	import redis.clients.jedis.Jedis;

	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;

	// 处理验证验证码请求的 Servlet
	@WebServlet("/CheckCodeServlet")
	public class CheckCodeServlet extends HttpServlet {
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	String code=request.getParameter("verify_code");
	String phoneNo=request.getParameter("phone_no");
	if(code==null\|\|phoneNo==null\|\|"".equals(code)\|\| "".equals(phoneNo)){
	return;
	}
	Jedis jedis = new Jedis("xxx.xx.xxx.xx",6379);
	String codeKey=phoneNo + ":code";
	String codeRedis = jedis.get(codeKey);
	if(code.equals(codeRedis)){
	jedis.del(codeKey);
	response.getWriter().write("true");
	}
	jedis.close();
	}

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

Redis