SpringBoot整合Redis
1.创建一个SpringBoot项目，参考地址 http://www.cnblogs.com/i-tao/p/8878562.html
2.开启Redis服务器
./bin/redis-server redis.conf
ps -ef|grep redis
3.SpringBoot整合Redis
3.1 在application.properties文件里面添加Redis服务器信息
#整合redis spring.redis.host=192.168.*.* //redis IP地址 spring.redis.port=6379 //端口号
3.2 在项目pom.xml文件里面添加Redis依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-redis</artifactId>
<version>1.3.8.RELEASE</version>
</dependency>
3.3 在项目入口开启Redis缓存@EnableCaching
package com.tao.springboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;
/**
* Hello world!
*
*/
@SpringBootApplication
@EnableCaching
public class App
{
public static void main( String[] args )
{
SpringApplication.run(App.class, args);
}
}
3.4 在项目需要缓存的service层添加缓存@Cacheable
package com.tao.springboot.service.impl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
import com.tao.springboot.mapper.UserMapper;
import com.tao.springboot.model.User;
import com.tao.springboot.service.UserService;
@Service
public class UserServiceImpl implements UserService{
@Autowired
private UserMapper userMapper;
@Override
@Cacheable(value = "AllUser")//设置缓存
public List<User> findAll() {
// TODO Auto-generated method stub
return userMapper.findAll();
}
}
//常用缓存注解
@Cacheable//设置缓存 @CacheEvict//移除缓存 @CachePut//加入缓存
3.5 启动SpringApplication
4.测试是否使用了缓存
4.1 浏览器访问：http://localhost:8080/User/findAll
清空控制台重新刷新页面，数据不变，控制台没有日志输出
重启项目，清空日志，在访问一次。
4.2 连接Redis客户端查询缓存是否存在：
./bin/redis-cli
keys *
SpringBoot整合Redis单机版本缓存结束。
第二种：springboot整合redis
1.maven依赖
<!--redis-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
<exclusions>
<exclusion>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
</exclusion>
<exclusion>
<groupId>io.lettuce</groupId>
<artifactId>lettuce-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
</dependency>
2.RedisConfig配置
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
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.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import redis.clients.jedis.JedisPoolConfig;
@Configuration
@AutoConfigureAfter(RedisAutoConfiguration.class)
public class RedisConfig {
@SuppressWarnings("deprecation")
@Bean
@ConfigurationProperties(prefix="redis")
JedisConnectionFactory jedisConnectionFactory() {
JedisConnectionFactory factory = new JedisConnectionFactory();
factory.setPoolConfig(jedisPoolConfig());
return factory;
}
@Bean
@ConfigurationProperties(prefix="redis.jedis.pool")
public JedisPoolConfig jedisPoolConfig() {
return new JedisPoolConfig();
}
@Bean
@SuppressWarnings("all")
RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
RedisTemplate<String, Object> template = new RedisTemplate<>();
template.setConnectionFactory(redisConnectionFactory);
//使用Jackson2JsonRedisSerializer来序列化和反序列化redis的value值
Jackson2JsonRedisSerializer serializer = new Jackson2JsonRedisSerializer(Object.class);
ObjectMapper mapper = new ObjectMapper();
mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
serializer.setObjectMapper(mapper);
template.setValueSerializer(serializer);
//使用StringRedisSerializer来序列化和反序列化redis的key值
template.setKeySerializer(new StringRedisSerializer());
template.setHashKeySerializer(new StringRedisSerializer());
template.setHashValueSerializer(serializer);
template.afterPropertiesSet();
return template;
}
}
3.RedisUtil工具类
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.data.redis.core.script.RedisScript;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;
import java.util.Collections;
import java.util.concurrent.TimeUnit;
@Component
public class RedisUtil {
private static final Long SUCCESS = 1L;
@Autowired
private RedisTemplate<String, Object> redisTemplate;
/**
* 指定缓存失效时间
*
* @param key 键
* @param time 时间(秒)
* @return
*/
public boolean expire(String key, long time) {
try {
if (time > 0) {
redisTemplate.expire(key, time, TimeUnit.SECONDS);
}
return true;
} catch (Exception e) {
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) {
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));
}
}
}
/**
* 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) {
return false;
}
}
/**
* 递增
*
* @param key 键
* @param delta 要增加几(大于0)
* @return
*/
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)
* @return 147
*/
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);
}
/**
* 获取分布式锁
*
* @param lockKey 锁
* @param requestId 请求标识
* @param expireTime 单位秒
* @param waitTimeout 单位毫秒
* @return 是否获取成功
*/
public boolean tryLock(String lockKey, String requestId, int expireTime, long waitTimeout) {
long nanoTime = System.nanoTime(); // 当前时间
try {
String script = "if redis.call('setNx',KEYS[1],ARGV[1]) then if redis.call('get',KEYS[1])==ARGV[1] then return redis.call('expire',KEYS[1],ARGV[2]) else return 0 end end";
int count = 0;
do {
RedisScript<String> redisScript = new DefaultRedisScript<>(script, String.class);
Object result = redisTemplate.execute(redisScript, Collections.singletonList(lockKey), requestId, expireTime);
if (SUCCESS.equals(result)) {
return true;
}
Thread.sleep(500L);//休眠500毫秒
count++;
} while ((System.nanoTime() - nanoTime) < TimeUnit.MILLISECONDS.toNanos(waitTimeout));
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
/**
* 释放锁
*
* @param lockKey 锁
* @param requestId 请求标识
* @return 是否释放成功
*/
public boolean releaseLock(String lockKey, String requestId) {
String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
RedisScript<String> redisScript = new DefaultRedisScript<>(script, String.class);
Object result = redisTemplate.execute(redisScript, Collections.singletonList(lockKey), requestId);
if (SUCCESS.equals(result)) {
return true;
}
return false;
}
}
#redis配置
redis:
host: 127.0.0.1
port: 6379
password: 123456
database: 0
jedis:
pool:
# 最大活跃链接数 默认8
max-active: 5
# 最大空闲连接数 默认8
max-idle: 10
# 最小空闲连接数 默认0
min-idle: 0
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