1.图片验证与缓存依赖:
<dependencies>
<!-- 验证码-->
<dependency>
<groupId>com.github.whvcse</groupId>
<artifactId>easy-captcha</artifactId>
<version>1.6.2</version>
</dependency>
<!-- redis-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
</dependency>
</dependencies>
2.redis配置:在application.properties中加入配置
spring.redis.host=localhost
spring.redis.port=6379
spring.redis.database= 0
spring.redis.timeout=1800000
spring.redis.lettuce.pool.max-active=20
spring.redis.lettuce.pool.max-wait=-1
#最大阻塞等待时间(负数表示没限制)
spring.redis.lettuce.pool.max-idle=5
spring.redis.lettuce.pool.min-idle=0
#最小空闲
3.redis工具类:
? ? ? ? 注意之所以每加static是因为咱们是注入形式调用的,而不是通过类名调用,这里是通过spring对象帮我们调用。注意!!!同时@component注解不要忘记加!
package com.laoyang.educms.utils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;
import javax.annotation.Resource;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
/**
* @author:Kevin
* @create: 2022-10-05 14:30
* @Description:
*/
@Component
public class redisutils {
@Autowired
private RedisTemplate<String, Object> redisTemplate;
// =============================common============================
/**
* 指定缓存失效时间
*
* @param key 键
* @param time 时间(秒)
*/
public boolean expire(String key, long time) {
try {
if (time > 0) {
redisTemplate.expire(key, time, TimeUnit.SECONDS);
}
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 根据key 获取过期时间
*
* @param key 键 不能为null
* @return 时间(秒) 返回0代表为永久有效
*/
public long getExpire(String key) {
return redisTemplate.getExpire(key, TimeUnit.SECONDS);
}
/**
* 判断key是否存在
*
* @param key 键
* @return true 存在 false不存在
*/
public boolean hasKey(String key) {
try {
return redisTemplate.hasKey(key);
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 删除缓存
*
* @param key 可以传一个值 或多个
*/
@SuppressWarnings("unchecked")
public void del(String... key) {
if (key != null && key.length > 0) {
if (key.length == 1) {
redisTemplate.delete(key[0]);
} else {
redisTemplate.delete(CollectionUtils.arrayToList(key));
}
}
}
// ============================String=============================
/**
* 普通缓存获取
*
* @param key 键
* @return 值
*/
public Object get(String key) {
return key == null ? null : redisTemplate.opsForValue().get(key);
}
/**
* 普通缓存放入
*
* @param key 键
* @param value 值
* @return true成功 false失败
*/
public boolean set(String key, Object value) {
try {
redisTemplate.opsForValue().set(key, value);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 普通缓存放入并设置时间
*
* @param key 键
* @param value 值
* @param time 时间(秒) time要大于0 如果time小于等于0 将设置无限期
* @return true成功 false 失败
*/
public boolean set(String key, Object value, long time) {
try {
if (time > 0) {
redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
} else {
set(key, value);
}
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 递增
*
* @param key 键
* @param delta 要增加几(大于0)
*/
public long incr(String key, long delta) {
if (delta < 0) {
throw new RuntimeException("递增因子必须大于0");
}
return redisTemplate.opsForValue().increment(key, delta);
}
/**
* 递减
*
* @param key 键
* @param delta 要减少几(小于0)
*/
public long decr(String key, long delta) {
if (delta < 0) {
throw new RuntimeException("递减因子必须大于0");
}
return redisTemplate.opsForValue().increment(key, -delta);
}
// ================================Map=================================
/**
* HashGet
*
* @param key 键 不能为null
* @param item 项 不能为null
*/
public Object hget(String key, String item) {
return redisTemplate.opsForHash().get(key, item);
}
/**
* 获取hashKey对应的所有键值
*
* @param key 键
* @return 对应的多个键值
*/
public Map<Object, Object> hmget(String key) {
return redisTemplate.opsForHash().entries(key);
}
/**
* HashSet
*
* @param key 键
* @param map 对应多个键值
*/
public boolean hmset(String key, Map<String, Object> map) {
try {
redisTemplate.opsForHash().putAll(key, map);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* HashSet 并设置时间
*
* @param key 键
* @param map 对应多个键值
* @param time 时间(秒)
* @return true成功 false失败
*/
public boolean hmset(String key, Map<String, Object> map, long time) {
try {
redisTemplate.opsForHash().putAll(key, map);
if (time > 0) {
expire(key, time);
}
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 向一张hash表中放入数据,如果不存在将创建
*
* @param key 键
* @param item 项
* @param value 值
* @return true 成功 false失败
*/
public boolean hset(String key, String item, Object value) {
try {
redisTemplate.opsForHash().put(key, item, value);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 向一张hash表中放入数据,如果不存在将创建
*
* @param key 键
* @param item 项
* @param value 值
* @param time 时间(秒) 注意:如果已存在的hash表有时间,这里将会替换原有的时间
* @return true 成功 false失败
*/
public boolean hset(String key, String item, Object value, long time) {
try {
redisTemplate.opsForHash().put(key, item, value);
if (time > 0) {
expire(key, time);
}
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 删除hash表中的值
*
* @param key 键 不能为null
* @param item 项 可以使多个 不能为null
*/
public void hdel(String key, Object... item) {
redisTemplate.opsForHash().delete(key, item);
}
/**
* 判断hash表中是否有该项的值
*
* @param key 键 不能为null
* @param item 项 不能为null
* @return true 存在 false不存在
*/
public boolean hHasKey(String key, String item) {
return redisTemplate.opsForHash().hasKey(key, item);
}
/**
* hash递增 如果不存在,就会创建一个 并把新增后的值返回
*
* @param key 键
* @param item 项
* @param by 要增加几(大于0)
*/
public double hincr(String key, String item, double by) {
return redisTemplate.opsForHash().increment(key, item, by);
}
/**
* hash递减
*
* @param key 键
* @param item 项
* @param by 要减少记(小于0)
*/
public double hdecr(String key, String item, double by) {
return redisTemplate.opsForHash().increment(key, item, -by);
}
// ============================set=============================
/**
* 根据key获取Set中的所有值
*
* @param key 键
*/
public Set<Object> sGet(String key) {
try {
return redisTemplate.opsForSet().members(key);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* 根据value从一个set中查询,是否存在
*
* @param key 键
* @param value 值
* @return true 存在 false不存在
*/
public boolean sHasKey(String key, Object value) {
try {
return redisTemplate.opsForSet().isMember(key, value);
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 将数据放入set缓存
*
* @param key 键
* @param values 值 可以是多个
* @return 成功个数
*/
public long sSet(String key, Object... values) {
try {
return redisTemplate.opsForSet().add(key, values);
} catch (Exception e) {
e.printStackTrace();
return 0;
}
}
/**
* 将set数据放入缓存
*
* @param key 键
* @param time 时间(秒)
* @param values 值 可以是多个
* @return 成功个数
*/
public long sSetAndTime(String key, long time, Object... values) {
try {
Long count = redisTemplate.opsForSet().add(key, values);
if (time > 0)
expire(key, time);
return count;
} catch (Exception e) {
e.printStackTrace();
return 0;
}
}
/**
* 获取set缓存的长度
*
* @param key 键
*/
public long sGetSetSize(String key) {
try {
return redisTemplate.opsForSet().size(key);
} catch (Exception e) {
e.printStackTrace();
return 0;
}
}
/**
* 移除值为value的
*
* @param key 键
* @param values 值 可以是多个
* @return 移除的个数
*/
public long setRemove(String key, Object... values) {
try {
Long count = redisTemplate.opsForSet().remove(key, values);
return count;
} catch (Exception e) {
e.printStackTrace();
return 0;
}
}
// ===============================list=================================
/**
* 获取list缓存的内容
*
* @param key 键
* @param start 开始
* @param end 结束 0 到 -1代表所有值
*/
public List<Object> lGet(String key, long start, long end) {
try {
return redisTemplate.opsForList().range(key, start, end);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* 获取list缓存的长度
*
* @param key 键
*/
public long lGetListSize(String key) {
try {
return redisTemplate.opsForList().size(key);
} catch (Exception e) {
e.printStackTrace();
return 0;
}
}
/**
* 通过索引 获取list中的值
*
* @param key 键
* @param index 索引 index>=0时, 0 表头,1 第二个元素,依次类推;index<0时,-1,表尾,-2倒数第二个元素,依次类推
*/
public Object lGetIndex(String key, long index) {
try {
return redisTemplate.opsForList().index(key, index);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* 将list放入缓存
*
* @param key 键
* @param value 值
*/
public boolean lSet(String key, Object value) {
try {
redisTemplate.opsForList().rightPush(key, value);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 将list放入缓存
*
* @param key 键
* @param value 值
* @param time 时间(秒)
*/
public boolean lSet(String key, Object value, long time) {
try {
redisTemplate.opsForList().rightPush(key, value);
if (time > 0)
expire(key, time);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 将list放入缓存
*
* @param key 键
* @param value 值
* @return
*/
public boolean lSet(String key, List<Object> value) {
try {
redisTemplate.opsForList().rightPushAll(key, value);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 将list放入缓存
*
* @param key 键
* @param value 值
* @param time 时间(秒)
* @return
*/
public boolean lSet(String key, List<Object> value, long time) {
try {
redisTemplate.opsForList().rightPushAll(key, value);
if (time > 0)
expire(key, time);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 根据索引修改list中的某条数据
*
* @param key 键
* @param index 索引
* @param value 值
* @return
*/
public boolean lUpdateIndex(String key, long index, Object value) {
try {
redisTemplate.opsForList().set(key, index, value);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 移除N个值为value
*
* @param key 键
* @param count 移除多少个
* @param value 值
* @return 移除的个数
*/
public long lRemove(String key, long count, Object value) {
try {
Long remove = redisTemplate.opsForList().remove(key, count, value);
return remove;
} catch (Exception e) {
e.printStackTrace();
return 0;
}
}
}
4.还需要加入配置类,否则启动不起来,一样@component注解不要忘记加!
????????
package com.laoyang.educms.config;
/**
* @author:Kevin
* @create: 2022-10-05 15:38
* @Description:
*/
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
import org.springframework.context.annotation.Bean;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import org.springframework.stereotype.Component;
@Component
public class Config {
@Bean(name = "template")
public RedisTemplate<String, Object> template(RedisConnectionFactory factory) {
// 创建RedisTemplate<String, Object>对象
RedisTemplate<String, Object> template = new RedisTemplate<>();
// 配置连接工厂
template.setConnectionFactory(factory);
// 定义Jackson2JsonRedisSerializer序列化对象
Jackson2JsonRedisSerializer<Object> jacksonSeial = new Jackson2JsonRedisSerializer<>(Object.class);
ObjectMapper om = new ObjectMapper();
// 指定要序列化的域,field,get和set,以及修饰符范围,ANY是都有包括private和public
om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
// 指定序列化输入的类型,类必须是非final修饰的,final修饰的类,比如String,Integer等会报异常
om.activateDefaultTyping(
LaissezFaireSubTypeValidator.instance ,
ObjectMapper.DefaultTyping.NON_FINAL,
JsonTypeInfo.As.WRAPPER_ARRAY);
jacksonSeial.setObjectMapper(om);
StringRedisSerializer stringSerial = new StringRedisSerializer();
// redis key 序列化方式使用stringSerial
template.setKeySerializer(stringSerial);
// redis value 序列化方式使用jackson
template.setValueSerializer(jacksonSeial);
// redis hash key 序列化方式使用stringSerial
template.setHashKeySerializer(stringSerial);
// redis hash value 序列化方式使用jackson
template.setHashValueSerializer(jacksonSeial);
template.afterPropertiesSet();
return template;
}
}
5.创建service:验证码service:两个方法,一个是生成验证码图片,另一个方法是验证输入的验证码是否正确。
package com.laoyang.educms.service;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* @author:Kevin
* @create: 2022-10-05 13:50
* @Description: 验证码
*/
public interface ValidateCodeService {
/**
* 生成验证码
*/
void create(String key, HttpServletResponse response) throws IOException;
/**
* 校验验证码
* @param key 前端上送 key
* @param value 前端上送待校验值
*/
boolean check(String key, String value);
}
6.编写验证码service的实现类:注意这里会用到缓存,因为咱们这个redis工具类不是static的,所以这里用的话需要对象注入调用
package com.laoyang.educms.service.impl;
import com.laoyang.CommonUtils.Contst.ResultCode;
import com.laoyang.MyException;
import com.laoyang.educms.entity.CacheObject;
import com.laoyang.educms.service.ValidateCodeService;
import com.laoyang.educms.utils.redisutils;
import com.wf.captcha.ArithmeticCaptcha;
import com.wf.captcha.base.Captcha;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Service;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* @author:Kevin
* @create: 2022-10-05 13:51
* @Description:
*/
@Service
public class ValidateCodeServiceImpl implements ValidateCodeService {
@Autowired
private redisutils redisutils;
/**
* 生成验证码图片
* @param key
* @param response
* @throws IOException
*/
@Override
public void create(String key, HttpServletResponse response) throws IOException {
if (StringUtils.isBlank(key)) {
throw new MyException(ResultCode.ERROR,"验证码不能为空");
}
response.setContentType(MediaType.IMAGE_PNG_VALUE);
response.setHeader(HttpHeaders.PRAGMA, "No-cache");
response.setHeader(HttpHeaders.CACHE_CONTROL, "No-cache");
response.setDateHeader(HttpHeaders.EXPIRES, 0L);
Captcha captcha = new ArithmeticCaptcha(115, 42);
captcha.setCharType(2);
String text = captcha.text();
System.out.println(text);
//设置过期时间为5分种
redisutils.set(key,text,300);
captcha.out(response.getOutputStream());
}
/**
* 校验输入的验证码
* @param key 前端上送 key
* @param value 前端上送待校验值
* @return
*/
@Override
public boolean check(String key, String value) {
if (StringUtils.isBlank(value)) {
throw new MyException(ResultCode.ERROR,"验证码不能为空");
}
//根据key从缓存中获取验证码
String code = (String) redisutils.get(key);
if (code == null) {
throw new MyException(ResultCode.ERROR,"验证码已经过期");
}
//比对验证码
if (!StringUtils.equalsIgnoreCase(value,
code)) {
throw new MyException(ResultCode.ERROR,"验证码不正确");
}
//验证通过,立即从缓存中删除验证码
redisutils.del(key);
return true;
}
}
7.编写一个前端后端数据交互的登录DTO
package com.laoyang.educms.entity;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.*;
import lombok.experimental.Accessors;
import javax.validation.constraints.NotEmpty;
/**
* @author:Kevin
* @create: 2022-10-05 15:00
* @Description:
*/
@Data
@NoArgsConstructor
@AllArgsConstructor
@Accessors(chain = true)
@ToString(callSuper = true)
@EqualsAndHashCode(callSuper = false)
@Builder
@ApiModel(value = "LoginParamDTO", description = "登录参数")
public class LoginDto {
@ApiModelProperty(value = "验证码KEY")
@NotEmpty(message = "验证码KEY不能为空")
private String key;
@ApiModelProperty(value = "验证码")
@NotEmpty(message = "验证码不能为空")
private String code;
@ApiModelProperty(value = "账号")
@NotEmpty(message = "账号不能为空")
private String account;
@ApiModelProperty(value = "密码")
@NotEmpty(message = "密码不能为空")
private String password;
@ApiModelProperty(value = "电话号码")
@NotEmpty(message = "电话号码不能为空")
private String Mobile;
}
8.编写验证码视图类
package com.laoyang.educms.controller;
import com.laoyang.CommonUtils.R;
import com.laoyang.educms.entity.LoginDto;
import com.laoyang.educms.entity.UcenterMember;
import com.laoyang.educms.service.UcenterMemberService;
import com.laoyang.educms.service.ValidateCodeService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* <p>
* 会员表 前端控制器
* </p>
*
* @author testjava
* @since 2022-10-05
*/
@RestController
@CrossOrigin
@Api(value = "UcenterMemberController", tags = "登录")
@RequestMapping("/educms/member")
public class UcenterMemberController {
@Autowired
private UcenterMemberService memberService;
@Autowired
private ValidateCodeService validateCodeService;
/**
* 登录
* @param loginDto
* @return
*/
@PostMapping("/login")
public R login(@RequestBody LoginDto loginDto){
if (validateCodeService.check(loginDto.getKey(), loginDto.getCode())){
String token = memberService.login(loginDto);
return R.ok("登录成功").data("token",token);
}
return R.error("登录失败");
}
/**
* 生成验证码
*/
@ApiOperation(value = "验证码", notes = "验证码")
@GetMapping(value = "/captcha", produces = "image/png")
public void captcha(@RequestParam(value = "key") String key,
HttpServletResponse response) throws IOException {
this.validateCodeService.create(key, response);
}
}
最终测试实现:
第一个测试生成验证码的接口:

?第二个是从redis缓存中通过传入的key获取数据再和前端用户输入的code值进行判断,如果不对,就从新刷新进行验证


10.前端接受时的写法,否则会乱码,需要加上响应类型为blob

11.前端的js代码获取

?
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