实例详解Spring Boot实战之Redis缓存登录验证码

程序员文章站 2024-02-23 13:15:46

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red...

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

实例详解Spring Boot实战之Redis缓存登录验证码