文章目录
一、添加依赖
xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
二、配置redis
yaml
spring:
# redis 配置
redis:
# 地址
host: localhost
# 端口,默认为6379
port: 6379
# 数据库索引
database: 0
# 密码,这里要改成自己的密码
password:
# 连接超时时间
timeout: 10s
lettuce:
pool:
# 连接池中的最小空闲连接
min-idle: 0
# 连接池中的最大空闲连接
max-idle: 8
# 连接池的最大数据库连接数
max-active: 8
# #连接池最大阻塞等待时间(使用负值表示没有限制)
max-wait: -1ms
三、配置类
位于package com.ruoyi.framework.config;
包下,主要用于自定义序列化解决乱码问题和写入lua限流脚本
java
/**
* redis配置
*
* @author ruoyi
*/
@Configuration
@EnableCaching // 开启注解开发
public class RedisConfig extends CachingConfigurerSupport
{
/**
* 注入spring容器,重写配置(主要自定义序列化)
* @param connectionFactory
* @return
*/
@Bean
@SuppressWarnings(value = { "unchecked", "rawtypes" })
public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory connectionFactory)
{
// 创建RedisTemplate对象
RedisTemplate<Object, Object> template = new RedisTemplate<>();
// 配置连接工厂
template.setConnectionFactory(connectionFactory);
// 使用fastjson序列化和反序列化redis的value值(默认使用jdk的序列化方式)
FastJson2JsonRedisSerializer serializer = new FastJson2JsonRedisSerializer(Object.class);
// 使用StringRedisSerializer来序列化和反序列化redis的key值
template.setKeySerializer(new StringRedisSerializer());
template.setValueSerializer(serializer);
// Hash的key也采用StringRedisSerializer的序列化方式
template.setHashKeySerializer(new StringRedisSerializer());
template.setHashValueSerializer(serializer);
// 重置配置信息
template.afterPropertiesSet();
return template;
}
/**
* 执行lua脚本
* @return
*/
@Bean
public DefaultRedisScript<Long> limitScript()
{
// 创建DefaultRedisScript执行lua脚本
DefaultRedisScript<Long> redisScript = new DefaultRedisScript<>();
// 执行脚本
redisScript.setScriptText(limitScriptText());
// 指定返回值类型
redisScript.setResultType(Long.class);
return redisScript;
}
/**
* 限流脚本
*/
private String limitScriptText()
{
return "local key = KEYS[1]\n" +
"local count = tonumber(ARGV[1])\n" +
"local time = tonumber(ARGV[2])\n" +
"local current = redis.call('get', key);\n" +
"if current and tonumber(current) > count then\n" +
" return tonumber(current);\n" +
"end\n" +
"current = redis.call('incr', key)\n" +
"if tonumber(current) == 1 then\n" +
" redis.call('expire', key, time)\n" +
"end\n" +
"return tonumber(current);";
}
}
四、FastJson2JsonRedisSerializer
位于package com.ruoyi.framework.config;
包下,Redis使用FastJson序列化
java
/**
* Redis使用FastJson序列化
*
* @author ruoyi
*/
public class FastJson2JsonRedisSerializer<T> implements RedisSerializer<T>
{
public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");
static final Filter AUTO_TYPE_FILTER = JSONReader.autoTypeFilter(Constants.JSON_WHITELIST_STR);
private Class<T> clazz;
public FastJson2JsonRedisSerializer(Class<T> clazz)
{
super();
this.clazz = clazz;
}
@Override
public byte[] serialize(T t) throws SerializationException
{
if (t == null)
{
return new byte[0];
}
return JSON.toJSONString(t, JSONWriter.Feature.WriteClassName).getBytes(DEFAULT_CHARSET);
}
@Override
public T deserialize(byte[] bytes) throws SerializationException
{
if (bytes == null || bytes.length <= 0)
{
return null;
}
String str = new String(bytes, DEFAULT_CHARSET);
return JSON.parseObject(str, clazz, AUTO_TYPE_FILTER);
}
}
五、redis工具类
位于package com.ruoyi.common.core.redis;
包下,对redis内置的基本
方法进行了二次封装
java
/**
* spring redis 工具类
*
* @author ruoyi
**/
@SuppressWarnings(value = { "unchecked", "rawtypes" })
@Component
public class RedisCache
{
@Autowired
public RedisTemplate redisTemplate;
/**
* 缓存基本的对象,Integer、String、实体类等
*
* @param key 缓存的键值
* @param value 缓存的值
*/
public <T> void setCacheObject(final String key, final T value)
{
redisTemplate.opsForValue().set(key, value);
}
/**
* 缓存基本的对象,Integer、String、实体类等
*
* @param key 缓存的键值
* @param value 缓存的值
* @param timeout 时间
* @param timeUnit 时间颗粒度
*/
public <T> void setCacheObject(final String key, final T value, final Integer timeout, final TimeUnit timeUnit)
{
redisTemplate.opsForValue().set(key, value, timeout, timeUnit);
}
/**
* 设置有效时间
*
* @param key Redis键
* @param timeout 超时时间
* @return true=设置成功;false=设置失败
*/
public boolean expire(final String key, final long timeout)
{
return expire(key, timeout, TimeUnit.SECONDS);
}
/**
* 设置有效时间
*
* @param key Redis键
* @param timeout 超时时间
* @param unit 时间单位
* @return true=设置成功;false=设置失败
*/
public boolean expire(final String key, final long timeout, final TimeUnit unit)
{
return redisTemplate.expire(key, timeout, unit);
}
/**
* 获取有效时间
*
* @param key Redis键
* @return 有效时间
*/
public long getExpire(final String key)
{
return redisTemplate.getExpire(key);
}
/**
* 判断 key是否存在
*
* @param key 键
* @return true 存在 false不存在
*/
public Boolean hasKey(String key)
{
return redisTemplate.hasKey(key);
}
/**
* 获得缓存的基本对象。
*
* @param key 缓存键值
* @return 缓存键值对应的数据
*/
public <T> T getCacheObject(final String key)
{
ValueOperations<String, T> operation = redisTemplate.opsForValue();
return operation.get(key);
}
/**
* 删除单个对象
*
* @param key
*/
public boolean deleteObject(final String key)
{
return redisTemplate.delete(key);
}
/**
* 删除集合对象
*
* @param collection 多个对象
* @return
*/
public boolean deleteObject(final Collection collection)
{
return redisTemplate.delete(collection) > 0;
}
/**
* 缓存List数据
*
* @param key 缓存的键值
* @param dataList 待缓存的List数据
* @return 缓存的对象
*/
public <T> long setCacheList(final String key, final List<T> dataList)
{
Long count = redisTemplate.opsForList().rightPushAll(key, dataList);
return count == null ? 0 : count;
}
/**
* 获得缓存的list对象
*
* @param key 缓存的键值
* @return 缓存键值对应的数据
*/
public <T> List<T> getCacheList(final String key)
{
return redisTemplate.opsForList().range(key, 0, -1);
}
/**
* 缓存Set
*
* @param key 缓存键值
* @param dataSet 缓存的数据
* @return 缓存数据的对象
*/
public <T> BoundSetOperations<String, T> setCacheSet(final String key, final Set<T> dataSet)
{
BoundSetOperations<String, T> setOperation = redisTemplate.boundSetOps(key);
Iterator<T> it = dataSet.iterator();
while (it.hasNext())
{
setOperation.add(it.next());
}
return setOperation;
}
/**
* 获得缓存的set
*
* @param key
* @return
*/
public <T> Set<T> getCacheSet(final String key)
{
return redisTemplate.opsForSet().members(key);
}
/**
* 缓存Map
*
* @param key
* @param dataMap
*/
public <T> void setCacheMap(final String key, final Map<String, T> dataMap)
{
if (dataMap != null) {
redisTemplate.opsForHash().putAll(key, dataMap);
}
}
/**
* 获得缓存的Map
*
* @param key
* @return
*/
public <T> Map<String, T> getCacheMap(final String key)
{
return redisTemplate.opsForHash().entries(key);
}
/**
* 往Hash中存入数据
*
* @param key Redis键
* @param hKey Hash键
* @param value 值
*/
public <T> void setCacheMapValue(final String key, final String hKey, final T value)
{
redisTemplate.opsForHash().put(key, hKey, value);
}
/**
* 获取Hash中的数据
*
* @param key Redis键
* @param hKey Hash键
* @return Hash中的对象
*/
public <T> T getCacheMapValue(final String key, final String hKey)
{
HashOperations<String, String, T> opsForHash = redisTemplate.opsForHash();
return opsForHash.get(key, hKey);
}
/**
* 获取多个Hash中的数据
*
* @param key Redis键
* @param hKeys Hash键集合
* @return Hash对象集合
*/
public <T> List<T> getMultiCacheMapValue(final String key, final Collection<Object> hKeys)
{
return redisTemplate.opsForHash().multiGet(key, hKeys);
}
/**
* 删除Hash中的某条数据
*
* @param key Redis键
* @param hKey Hash键
* @return 是否成功
*/
public boolean deleteCacheMapValue(final String key, final String hKey)
{
return redisTemplate.opsForHash().delete(key, hKey) > 0;
}
/**
* 获得缓存的基本对象列表
*
* @param pattern 字符串前缀
* @return 对象列表
*/
public Collection<String> keys(final String pattern)
{
return redisTemplate.keys(pattern);
}
}
六、若依redi的使用
2.1、controller的基本使用
位于package com.ruoyi.web.controller.monitor;
包下
java
/**
* 缓存监控
*
* @author ruoyi
*/
@RestController
@RequestMapping("/monitor/cache")
public class CacheController
{
// 注入redis
@Autowired
private RedisTemplate<String, String> redisTemplate;
// 项目启动加入静态数据
private final static List<SysCache> caches = new ArrayList<SysCache>();
{
caches.add(new SysCache(CacheConstants.LOGIN_TOKEN_KEY, "用户信息"));
caches.add(new SysCache(CacheConstants.SYS_CONFIG_KEY, "配置信息"));
caches.add(new SysCache(CacheConstants.SYS_DICT_KEY, "数据字典"));
caches.add(new SysCache(CacheConstants.CAPTCHA_CODE_KEY, "验证码"));
caches.add(new SysCache(CacheConstants.REPEAT_SUBMIT_KEY, "防重提交"));
caches.add(new SysCache(CacheConstants.RATE_LIMIT_KEY, "限流处理"));
caches.add(new SysCache(CacheConstants.PWD_ERR_CNT_KEY, "密码错误次数"));
}
/**
* 获取缓存信息
* @return
* @throws Exception
*/
@PreAuthorize("@ss.hasPermi('monitor:cache:list')") // 安全校验
@GetMapping() // get请求
public AjaxResult getInfo() throws Exception
{
// 获取redis软件相关所有信息
Properties info = (Properties) redisTemplate.execute((RedisCallback<Object>) connection -> connection.info());
// 获取redis缓存命令统计信息
Properties commandStats = (Properties) redisTemplate.execute((RedisCallback<Object>) connection -> connection.info("commandstats"));
// 获取可以用key的总数
Object dbSize = redisTemplate.execute((RedisCallback<Object>) connection -> connection.dbSize());
// 封装数据
Map<String, Object> result = new HashMap<>(3);
result.put("info", info);
result.put("dbSize", dbSize);
// 处理commandStats数据信息
List<Map<String, String>> pieList = new ArrayList<>();
commandStats.stringPropertyNames().forEach(key -> {
Map<String, String> data = new HashMap<>(2);
// 获取key对应的值
String property = commandStats.getProperty(key);
// 删除key的前缀
data.put("name", StringUtils.removeStart(key, "cmdstat_"));
// 删除key获取到value的前后缀
data.put("value", StringUtils.substringBetween(property, "calls=", ",usec"));
pieList.add(data);
});
// 封装数据
result.put("commandStats", pieList);
return AjaxResult.success(result);
}
/**
* 返回静态redis数据
* @return
*/
@PreAuthorize("@ss.hasPermi('monitor:cache:list')")
@GetMapping("/getNames")
public AjaxResult cache()
{
return AjaxResult.success(caches);
}
/**
* 根据key模糊匹配所有的key
* @param cacheName
* @return
*/
@PreAuthorize("@ss.hasPermi('monitor:cache:list')")
@GetMapping("/getKeys/{cacheName}")
public AjaxResult getCacheKeys(@PathVariable String cacheName)
{
// 例如key=name*
Set<String> cacheKeys = redisTemplate.keys(cacheName + "*");
return AjaxResult.success(cacheKeys);
}
/**
* 根据key查询value,并且拼接为缓存对象返回
* @param cacheName
* @param cacheKey
* @return
*/
@PreAuthorize("@ss.hasPermi('monitor:cache:list')")
@GetMapping("/getValue/{cacheName}/{cacheKey}")
public AjaxResult getCacheValue(@PathVariable String cacheName, @PathVariable String cacheKey)
{
String cacheValue = redisTemplate.opsForValue().get(cacheKey);
SysCache sysCache = new SysCache(cacheName, cacheKey, cacheValue);
return AjaxResult.success(sysCache);
}
/**
* 删除缓存,根据key模糊匹配删除
* @param cacheName
* @return
*/
@PreAuthorize("@ss.hasPermi('monitor:cache:list')")
@DeleteMapping("/clearCacheName/{cacheName}")
public AjaxResult clearCacheName(@PathVariable String cacheName)
{
Collection<String> cacheKeys = redisTemplate.keys(cacheName + "*");
redisTemplate.delete(cacheKeys);
return AjaxResult.success();
}
/**
* 删除单个缓存,根据key
* @param cacheKey
* @return
*/
@PreAuthorize("@ss.hasPermi('monitor:cache:list')")
@DeleteMapping("/clearCacheKey/{cacheKey}")
public AjaxResult clearCacheKey(@PathVariable String cacheKey)
{
redisTemplate.delete(cacheKey);
return AjaxResult.success();
}
/**
* 清除所有缓存
* @return
*/
@PreAuthorize("@ss.hasPermi('monitor:cache:list')")
@DeleteMapping("/clearCacheAll")
public AjaxResult clearCacheAll()
{
Collection<String> cacheKeys = redisTemplate.keys("*");
redisTemplate.delete(cacheKeys);
return AjaxResult.success();
}
}