实例详解Spring Boot实战之Redis缓存登录验证码

       <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> 

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 

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; 
  } 
} 

@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); 

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; 
    } 
  } 
} 

@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; 
}