java 操作redis工具类
1.添加maven的包
org.springframework.boot spring-boot-starter-data-redis
2.添加redis配置
spring.redis.database=1 spring.redis.host=127.0.0.1 #spring.redis.password=testpassword spring.redis.port=6379 spring.redis.timeout=5000 spring.redis.jedis.pool.max-active=8 spring.redis.jedis.pool.max-wait=-1 spring.redis.jedis.pool.max-idle=8 spring.redis.jedis.pool.min-idle=0
3.redis操作类
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;
import javax.annotation.Resource;
import java.util.*;
import java.util.concurrent.TimeUnit;
/**
* Author: linjunit
* Version：Redis工具类
* Date: 2020/6/12 0012
* Description:
* Modification History:
* Date Author Version Description
* --------------------------------------------------------------
* Why & What is modified:
*/
@Component
@Slf4j
public class RedisClient {
@Autowired
RedisTemplate redisTemplate;
@Autowired
StringRedisTemplate stringRedisTemplate;
private static final String COLON = ":";
/**
* 存储到redis中的锁标志
*/
private static final String LOCKED = "LOCKED";
/**
* 默认请求锁的超时时间(ms 毫秒)
*/
private static final long TIME_OUT = 100;
/**
* 锁flag
*/
private volatile boolean isLocked = false;
/**
* 缓存字符串
*
* @param table 表
* @param key 键
* @param value 值
* @return
*/
public boolean set(String table, String key, String value) {
try {
key = table.equals("") ? key : table + COLON + key;
stringRedisTemplate.opsForValue().set(key, value);
return true;
} catch (Exception ex) {
return false;
}
}
/**
* 缓存字符串
*
* @param table 表
* @param key 键
* @param value 值
* @param expireTime 过期时间(秒)
* @return
*/
public boolean set(String table, String key, String value, long expireTime) {
try {
key = table.equals("") ? key : table + COLON + key;
stringRedisTemplate.opsForValue().set(key, value, expireTime, TimeUnit.SECONDS);
return true;
} catch (Exception ex) {
return false;
}
}
/**
* 缓存对象
*
* @param table 表
* @param key 键
* @param value 值
* @return
*/
public boolean set(String table, String key, Object value) {
try {
String json = JSON.toJSONString(value);
return this.set(table, key, json);
} catch (Exception ex) {
return false;
}
}
/**
* 缓存对象
*
* @param table 表
* @param key 键
* @param value 值
* @param expireTime 过期时间(秒)
* @return
*/
public boolean set(String table, String key, Object value, long expireTime) {
try {
String json = JSON.toJSONString(value);
return this.set(table, key, json, expireTime);
} catch (Exception ex) {
return false;
}
}
/**
* 根据键取缓存数据
*
* @param table 表
* @param key 键
* @return 缓存数据
*/
public String get(String table, String key) {
try {
key = table.equals("") ? key : table + COLON + key;
return stringRedisTemplate.opsForValue().get(key);
} catch (Exception ex) {
return "";
}
}
/**
* 根据键获取缓存对象
*
* @param table
* @param key
* @param clazz
* @param
* @return
*/
public T get(String table, String key, Class clazz) {
try {
key = table.equals("") ? key : table + COLON + key;
String json = stringRedisTemplate.opsForValue().get(key);
return JSON.parseObject(json, clazz);
} catch (Exception ex) {
return null;
}
}
/**
* 根据键删除缓存数据
*
* @param table
* @param key
* @return
*/
public boolean del(String table, String key) {
try {
key = table.equals("") ? key : table + COLON + key;
return stringRedisTemplate.delete(key);
} catch (Exception ex) {
return false;
}
}
/**
* 设置分布式Redis锁
*
* @param table 表
* @param key 键
* @param expireTime 过期时间(秒)
* @return
*/
public boolean lock(String table, String key, long expireTime) {
long nowTime = System.nanoTime();
long timeout = TIME_OUT * 1000000;
final Random random = new Random();
key = table.equals("") ? key : table + COLON + key;
while ((System.nanoTime() - nowTime) < timeout) {
boolean result = redisTemplate.opsForValue().setIfAbsent(key, LOCKED);
if (result) {
isLocked = true;
redisTemplate.expire(key, expireTime, TimeUnit.SECONDS);
break;
}
try {
Thread.sleep(10, random.nextInt(50000));
} catch (InterruptedException e) {
log.error("获取分布式锁休眠被中断：", e);
}
}
return isLocked;
}
/**
* 根据键判断是否有分布式锁
*
* @param table 表
* @param key 键
* @return
*/
public boolean isLock(String table, String key) {
key = table.equals("") ? key : table + COLON + key;
redisTemplate.getConnectionFactory().getConnection().time();
return redisTemplate.hasKey(key);
}
/**
* 释放分布式Redis锁
*
* @param table 表
* @param key 键
*/
public void unlock(String table, String key) {
// 释放锁
// 不管请求锁是否成功，只要已经上锁，客户端都会进行释放锁的操作
if (isLocked) {
key = table.equals("") ? key : table + COLON + key;
redisTemplate.delete(key);
}
}
/**
* 获取访问次数
*
* @param table 表
* @param key 键
* @param expireTime 过期时间(秒)
* @return
*/
public int getCount(String table, String key, long expireTime) {
key = table.equals("") ? key : table + COLON + key;
int resultCount = Math.toIntExact(redisTemplate.opsForValue().increment(key, 1));
redisTemplate.expire(key, expireTime, TimeUnit.SECONDS);
return resultCount;
}
/**
* 获取第二天零时失效的时间
*
* @return expireTime 过期时间(秒)
*/
public Long getSecondsNextEarlyMorning() {
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_YEAR, 1);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.MILLISECOND, 0);
return (cal.getTimeInMillis() - System.currentTimeMillis()) / 1000;
}
}
4.简单的存储/获取redis
@Autowired private RedisClient redis;
redis.set("uds_userToken", "uds_userToken", result);
StoreUserInfoOutput user = redis.get("uds_userToken",token,StoreUserInfoOutput.class);