Spring Boot 使用注解集成 Redis 缓存
Spring Boot 熟悉后，集成一个外部扩展是一件很容易的事，集成Redis也很简单，看下面步骤配置：
一、添加pom依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-redis</artifactId>
</dependency>二、创建 RedisClient.java 注意该类存放的package
package org.springframework.data.redis.connection.jedis;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.UnsupportedEncodingException;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.Protocol;
import redis.clients.jedis.exceptions.JedisException;
/**
* 工具类 RedisClient
* 因为本类中获取JedisPool调用的是JedisConnectionFactory中protected修饰的方法fetchJedisConnector()
* 所以该类需要与JedisConnectionFactory在同一个package中
*
* @author 单红宇(CSDN CATOOP)
* @create 2017年4月9日
*/
public class RedisClient {
private static Logger logger = LoggerFactory.getLogger(RedisClient.class);
private JedisConnectionFactory factory;
public RedisClient(JedisConnectionFactory factory) {
super();
this.factory = factory;
}
/**
* put操作（存储序列化对象）+ 生效时间
*
* @param key
* @param value
* @return
*/
public void putObject(final String key, final Object value, final int cacheSeconds) {
if (StringUtils.isNotBlank(key)) {
redisTemplete(key, new RedisExecute<Object>() {
@Override
public Object doInvoker(Jedis jedis) {
try {
jedis.setex(key.getBytes(Protocol.CHARSET), cacheSeconds, serialize(value));
} catch (UnsupportedEncodingException e) {
}
return null;
}
});
}
}
/**
* get操作（获取序列化对象）
*
* @param key
* @return
*/
public Object getObject(final String key) {
return redisTemplete(key, new RedisExecute<Object>() {
@Override
public Object doInvoker(Jedis jedis) {
try {
byte[] byteKey = key.getBytes(Protocol.CHARSET);
byte[] byteValue = jedis.get(byteKey);
if (byteValue != null) {
return deserialize(byteValue);
}
} catch (UnsupportedEncodingException e) {
return null;
}
return null;
}
});
}
/**
* setex操作
*
* @param key
* 键
* @param value
* 值
* @param cacheSeconds
* 超时时间，0为不超时
* @return
*/
public String set(final String key, final String value, final int cacheSeconds) {
return redisTemplete(key, new RedisExecute<String>() {
@Override
public String doInvoker(Jedis jedis) {
if (cacheSeconds == 0) {
return jedis.set(key, value);
}
return jedis.setex(key, cacheSeconds, value);
}
});
}
/**
* get操作
*
* @param key
* 键
* @return 值
*/
public String get(final String key) {
return redisTemplete(key, new RedisExecute<String>() {
@Override
public String doInvoker(Jedis jedis) {
String value = jedis.get(key);
return StringUtils.isNotBlank(value) && !"nil".equalsIgnoreCase(value) ? value : null;
}
});
}
/**
* del操作
*
* @param key
* 键
* @return
*/
public long del(final String key) {
return redisTemplete(key, new RedisExecute<Long>() {
@Override
public Long doInvoker(Jedis jedis) {
return jedis.del(key);
}
});
}
/**
* 获取资源
*
* @return
* @throws JedisException
*/
public Jedis getResource() throws JedisException {
Jedis jedis = null;
try {
jedis = factory.fetchJedisConnector();
} catch (JedisException e) {
logger.error("getResource.", e);
returnBrokenResource(jedis);
throw e;
}
return jedis;
}
/**
* 获取资源
*
* @return
* @throws JedisException
*/
public Jedis getJedis() throws JedisException {
return getResource();
}
/**
* 归还资源
*
* @param jedis
* @param isBroken
*/
public void returnBrokenResource(Jedis jedis) {
if (jedis != null) {
jedis.close();
}
}
/**
* 释放资源
*
* @param jedis
* @param isBroken
*/
public void returnResource(Jedis jedis) {
if (jedis != null) {
jedis.close();
}
}
/**
* 操作jedis客户端模板
*
* @param key
* @param execute
* @return
*/
public <R> R redisTemplete(String key, RedisExecute<R> execute) {
Jedis jedis = null;
try {
jedis = getResource();
if (jedis == null) {
return null;
}
return execute.doInvoker(jedis);
} catch (Exception e) {
logger.error("operator redis api fail,{}", key, e);
} finally {
returnResource(jedis);
}
return null;
}
/**
* 功能简述: 对实体Bean进行序列化操作.
*
* @param source
* 待转换的实体
* @return 转换之后的字节数组
* @throws Exception
*/
public static byte[] serialize(Object source) {
ByteArrayOutputStream byteOut = null;
ObjectOutputStream ObjOut = null;
try {
byteOut = new ByteArrayOutputStream();
ObjOut = new ObjectOutputStream(byteOut);
ObjOut.writeObject(source);
ObjOut.flush();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (null != ObjOut) {
ObjOut.close();
}
} catch (IOException e) {
ObjOut = null;
}
}
return byteOut.toByteArray();
}
/**
* 功能简述: 将字节数组反序列化为实体Bean.
*
* @param source
* 需要进行反序列化的字节数组
* @return 反序列化后的实体Bean
* @throws Exception
*/
public static Object deserialize(byte[] source) {
ObjectInputStream ObjIn = null;
Object retVal = null;
try {
ByteArrayInputStream byteIn = new ByteArrayInputStream(source);
ObjIn = new ObjectInputStream(byteIn);
retVal = ObjIn.readObject();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (null != ObjIn) {
ObjIn.close();
}
} catch (IOException e) {
ObjIn = null;
}
}
return retVal;
}
interface RedisExecute<T> {
T doInvoker(Jedis jedis);
}
}三、创建Redis配置类
RedisConfig.java
package com.nowjava.example.redis;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.connection.jedis.RedisClient;
import org.springframework.data.redis.core.RedisTemplate; import org.springframework.data.redis.serializer.StringRedisSerializer;
/**
* Redis配置
*
* @author 单红宇(CSDN catoop)
* @create 2016年9月12日
*/
@Configuration
public class RedisConfig {
@Bean
public RedisTemplate<String, Object> redisTemplate(JedisConnectionFactory factory) {
RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
template.setConnectionFactory(factory);
template.setKeySerializer(new StringRedisSerializer());
template.setValueSerializer(new RedisObjectSerializer());
template.afterPropertiesSet();
return template;
}
@Bean
public RedisClient redisClient(JedisConnectionFactory factory){
return new RedisClient(factory);
}
}
RedisObjectSerializer.java
package com.nowjava.example.redis;
import org.springframework.core.convert.converter.Converter;
import org.springframework.core.serializer.support.DeserializingConverter;
import org.springframework.core.serializer.support.SerializingConverter;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;
/**
* 实现对象的序列化接口
* @author 单红宇(365384722)
* @myblog http://blog.csdn.net/catoop/
* @create 2017年4月9日
*/
public class RedisObjectSerializer implements RedisSerializer<Object> {
private Converter<Object, byte[]> serializer = new SerializingConverter();
private Converter<byte[], Object> deserializer = new DeserializingConverter();
static final byte[] EMPTY_ARRAY = new byte[0];
@Override
public Object deserialize(byte[] bytes) {
if (isEmpty(bytes)) {
return null;
}
try {
return deserializer.convert(bytes);
} catch (Exception ex) {
throw new SerializationException("Cannot deserialize", ex);
}
}
@Override
public byte[] serialize(Object object) {
if (object == null) {
return EMPTY_ARRAY;
}
try {
return serializer.convert(object);
} catch (Exception ex) {
return EMPTY_ARRAY;
}
}
private boolean isEmpty(byte[] data) {
return (data == null || data.length == 0);
}
}四、创建测试方法 下面代码随便放一个Controller里
@Autowired
private RedisTemplate<String, Object> redisTemplate;
/**
* 缓存测试
*
* @return
* @author NOWJAVA
* @create 2016年9月12日
*/
@RequestMapping("/redisTest")
public String redisTest() {
try {
redisTemplate.opsForValue().set("test-key", "redis测试内容", 2, TimeUnit.SECONDS);// 缓存有效期2秒
logger.info("从Redis中读取数据：" + redisTemplate.opsForValue().get("test-key").toString());
TimeUnit.SECONDS.sleep(3);
logger.info("等待3秒后尝试读取过期的数据：" + redisTemplate.opsForValue().get("test-key"));
} catch (InterruptedException e) {
e.printStackTrace();
}
return "OK";
}五、配置文件配置Redis application.yml
spring:
# Redis配置
redis:
host: 192.168.1.101
port: 6379
password:
# 连接超时时间（毫秒）
timeout: 10000
pool:
max-idle: 20
min-idle: 5
max-active: 20
max-wait: 2这样就完成了Redis的配置，可以正常使用 redisTemplate 了。
一、创建 Caching 配置类
RedisKeys.java
package com.nowjava.example.redis;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.PostConstruct;
import org.springframework.stereotype.Component;
/**
* 方法缓存key常量
*
* @author NOWJAVA
*/
@Component
public class RedisKeys {
// 测试 begin
public static final String _CACHE_TEST = "_cache_test";// 缓存key
public static final Long _CACHE_TEST_SECOND = 20L;// 缓存时间
// 测试 end
// 根据key设定具体的缓存时间
private Map<String, Long> expiresMap = null;
@PostConstruct
public void init(){
expiresMap = new HashMap<>();
expiresMap.put(_CACHE_TEST, _CACHE_TEST_SECOND);
}
public Map<String, Long> getExpiresMap(){
return this.expiresMap;
}
}CachingConfig.java
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