实例详解Spring Boot实战之Redis缓存登录验证码

本章简单介绍redis的配置及使用方法,本文示例代码在前面代码的基础上进行修改添加,实现了使用redis进行缓存验证码,以及校验验证码的过程。

1、添加依赖库(添加redis库,以及第三方的验证码库)

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-redis</artifactId>

</dependency>

<dependency>

<groupId>cn.apiclub.tool</groupId>

<artifactId>simplecaptcha</artifactId>

<version>1.2.2</version>

</dependency>

2、在application.properties中添加redis的配置信息

spring.redis.database=4

spring.redis.host=hostname

spring.redis.password=password

spring.redis.port=6379

spring.redis.timeout=2000

spring.redis.pool.max-idle=8

spring.redis.pool.min-idle=0

spring.redis.pool.max-active=8

spring.redis.pool.max-wait=-1

3、添加redis数据模版

新增RedisConfig.Java

package com.xiaofangtech.sun.config;

import org.springframework.context.annotation.Bean;

import org.springframework.data.redis.connection.RedisConnectionFactory;

import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;

import org.springframework.data.redis.core.RedisTemplate;

import org.springframework.data.redis.serializer.StringRedisSerializer;

public class RedisConfig {

@Bean

JedisConnectionFactory jedisConnectionFactory() {

return new JedisConnectionFactory();

}

@Bean RedisTemplate<String, String>redisTemplate(RedisConnectionFactory factory)

{

RedisTemplate<String, String> template = new RedisTemplate<String, String>();

template.setConnectionFactory(jedisConnectionFactory());

template.setKeySerializer(new StringRedisSerializer());

template.setValueSerializer(new StringRedisSerializer());

return template;

}

}

4、redis的基本使用(缓存生成的验证码信息)

新建CaptchaModule.java,涉及redis插入操作关键代码

@Autowired

private RedisTemplate<String, String> redisTemplate;

//将验证码以<key,value>形式缓存到redis

redisTemplate.opsForValue().set(uuid, captcha.getAnswer(), captchaExpires, TimeUnit.SECONDS);

完整代码

package com.xiaofangtech.sunt.utils;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.util.UUID;

import java.util.concurrent.TimeUnit;

import javax.imageio.ImageIO;

import javax.servlet.http.Cookie;

import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.data.redis.core.RedisTemplate;

import org.springframework.http.MediaType;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.bind.annotation.RestController;

import cn.apiclub.captcha.Captcha;

import cn.apiclub.captcha.backgrounds.GradiatedBackgroundProducer;

import cn.apiclub.captcha.gimpy.FishEyeGimpyRenderer;

@RestController

@RequestMapping("captcha")

public class CaptchaModule {

@Autowired

private RedisTemplate<String, String> redisTemplate;

private static int captchaExpires = 3*60; //超时时间3min

private static int captchaW = 200;

private static int captchaH = 60;

@RequestMapping(value = "getcaptcha", method = RequestMethod.GET, produces = MediaType.IMAGE_PNG_VALUE)

public @ResponseBody byte[] getCaptcha(HttpServletResponse response)

{

//生成验证码

String uuid = UUID.randomUUID().toString();

Captcha captcha = new Captcha.Builder(captchaW, captchaH)

.addText().addBackground(new GradiatedBackgroundProducer())

.gimp(new FishEyeGimpyRenderer())

.build();

//将验证码以<key,value>形式缓存到redis

redisTemplate.opsForValue().set(uuid, captcha.getAnswer(), captchaExpires, TimeUnit.SECONDS);

//将验证码key,及验证码的图片返回

Cookie cookie = new Cookie("CaptchaCode",uuid);

response.addCookie(cookie);

ByteArrayOutputStream bao = new ByteArrayOutputStream();

try {

ImageIO.write(captcha.getImage(), "png", bao);

return bao.toByteArray();

} catch (IOException e) {

return null;

}

}

}

5、redis内容的获取(根据key获取验证码)

完善前面获取token的流程,在获取token的接口中添加校验验证码的流程(根据登录参数中的验证码id获取验证码内容,并与登录参数中的验证码内容进行比对)

修改JsonWebToken.java

@Autowired

private RedisTemplate<String, String> redisTemplate;

//验证码校验在后面章节添加

String captchaCode = loginPara.getCaptchaCode();

try {

if (captchaCode == null)

{

throw new Exception();

}

String captchaValue = redisTemplate.opsForValue().get(captchaCode);

if (captchaValue == null)

{

throw new Exception();

}

redisTemplate.delete(captchaCode);

if (captchaValue.compareTo(loginPara.getCaptchaValue()) != 0)

{

throw new Exception();

}

} catch (Exception e) {

resultMsg = new ResultMsg(ResultStatusCode.INVALID_CAPTCHA.getErrcode(),

ResultStatusCode.INVALID_CAPTCHA.getErrmsg(), null);

return resultMsg;

}

6、测试

1)请求获取验证码,可以获取到验证码图片,以及在cookie中返回缓存入redis的key值

2)查看redis,可以查看到之前缓存的key value

3)登录获取token时,添加验证码参数

如果验证码错误,返回验证码错误

验证码正确,且用户名密码正确,返回token

总结

以上所述是小编给大家介绍的实例详解Spring Boot" title="Spring Boot">Spring Boot实战之Redis缓存登录验证码,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对网站的支持!

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