高并发秒杀——SpringBoot集成redis
shop--13.升级--Redis缓存技术
集成Redis
1.添加Jedis依赖
2.添加Fastjson依赖
1.安装redis http://www.runoob.com/redis/redis-install.html
1.引入redis依赖
<!--redis客户端：jedis--> <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.9.0</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.1.41</version> </dependency> <!--配置springBootConfiguration, 可以使用@ConfigurationProperties(prefix = "redis")--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-configuration-processor</artifactId> <optional>true</optional> </dependency>
2.在application.properties加入redis配置文件
redis.host=127.0.0.1 redis.port=6379 redis.timeout=3 redis.pool.MaxTotal=10 redis.database=0 redis.pool.maxActive=100 redis.pool.maxIdle=20 redis.pool.maxWait=3 redis.pool.testOnBorrow=true
3. 定义redis的类，引入redis配置
@Component
@ConfigurationProperties(prefix = "redis")
public class RedisConfig {
private String host;
private int port;
private int timeout;
private int poolMaxTotal;
private int poolMaxIdle;
private int poolMaxWait;
public String getHost() {
return host;
}
public void setHost(String host) {
this.host = host;
}
public int getPort() {
return port;
}
public void setPort(int port) {
this.port = port;
}
public int getTimeout() {
return timeout;
}
public void setTimeout(int timeout) {
this.timeout = timeout;
}
public int getPoolMaxTotal() {
return poolMaxTotal;
}
public void setPoolMaxTotal(int poolMaxTotal) {
this.poolMaxTotal = poolMaxTotal;
}
public int getPoolMaxIdle() {
return poolMaxIdle;
}
public void setPoolMaxIdle(int poolMaxIdle) {
this.poolMaxIdle = poolMaxIdle;
}
public int getPoolMaxWait() {
return poolMaxWait;
}
public void setPoolMaxWait(int poolMaxWait) {
this.poolMaxWait = poolMaxWait;
}
}
4.RedisPoolFactory类
@Service
public class RedisPoolFactory {
@Autowired
RedisConfig redisConfig;
@Bean
public JedisPool JedisPoolFactory(){
JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
jedisPoolConfig.setMaxIdle(redisConfig.getPoolMaxIdle());
jedisPoolConfig.setMaxTotal(redisConfig.getPoolMaxTotal());
jedisPoolConfig.setMaxWaitMillis(redisConfig.getPoolMaxWait() * 1000);
JedisPool jedisPool = new JedisPool(jedisPoolConfig, redisConfig.getHost(),
redisConfig.getPort(), redisConfig.getTimeout() * 1000);
return jedisPool;
}
}
5.编写RedisService类
@Service
public class RedisRervice {
@Autowired
JedisPool jedisPool;
/**
* h获取单个对象
* @param prefix
* @param key
* @param clazz
* @param <T>
* @return
*/
public <T> T get(KeyPrefix prefix, String key, Class<T> clazz){
Jedis jedis = null;
try{
jedis = jedisPool.getResource();
//生成真正的key
String realKey = prefix.getKeyPrefix() + key;
String str = jedis.get(realKey);
T t = stringToBean(str, clazz);
return t;
}finally {
jedis.close();
}
}
/**
* 设置缓存值
* @param prefix
* @param key
* @param value
* @param <T>
* @return
*/
public <T> boolean set(KeyPrefix prefix, String key, T value){
Jedis jedis = null;
try{
jedis = jedisPool.getResource();
String str = beanToString(value);
if(str == null || str.length() <= 0){
return false;
}
//生成真正的key
String realKey = prefix.getKeyPrefix() + key;
int second = prefix.expireSeconds();
if(second <= 0){
jedis.set(realKey, str);
}else{
jedis.setex(realKey, second, str);
}
jedis.set(realKey, str);
return true;
} finally {
jedis.close();
}
}
private <T> String beanToString(T value) {
if(value == null){
return null;
}
Class<?> clazz = value.getClass();
if(clazz == int.class || clazz == Integer.class){
return "" + value;
}else if(clazz == String.class){
return (String) value;
} else if(clazz == long.class || clazz == Long.class){
return "" + value;
}else{
return JSON.toJSONString(value);
}
}
private <T> T stringToBean(String str, Class<T> clazz) {
if (str == null || str.length() <= 0 || clazz == null) {
return null;
}
if (clazz == int.class || clazz == Integer.class) {
return (T) Integer.valueOf(str);
} else if (clazz == String.class) {
return (T) str;
} else if (clazz == long.class || clazz == Long.class) {
return (T) Long.valueOf(str);
} else {
return JSON.toJavaObject(JSON.parseObject(str), clazz);
}
}
/**
* 判断是否存在
* @param prefix
* @param key
* @param <T>
* @return
*/
public <T> boolean exits(KeyPrefix prefix, String key){
Jedis jedis = null;
try{
jedis = jedisPool.getResource();
String realKey = prefix.getKeyPrefix() + key;
return jedis.exists(realKey);
} finally {
jedis.close();
}
}
/**
* 增加值
* @param prefix
* @param key
* @param <T>
* @return
*/
public <T> Long incr(KeyPrefix prefix, String key){
Jedis jedis = null;
try{
jedis = jedisPool.getResource();
String realKey = prefix.getKeyPrefix() + key;
return jedis.incr(realKey);
} finally {
jedis.close();
}
}
/**
* 减少值
* @param prefix
* @param key
* @param <T>
* @return
*/
public <T> Long decr(KeyPrefix prefix, String key){
Jedis jedis = null;
try{
jedis = jedisPool.getResource();
String realKey = prefix.getKeyPrefix() + key;
return jedis.decr(realKey);
} finally {
jedis.close();
}
}
}
6.controller中测试
@Autowired
RedisService redisService;
@RequestMapping(value = "/redis/set", method = RequestMethod.GET)
@ResponseBody
public boolean redisSet(){
boolean value = redisService.set("key2", "redis");
return value;
}
@RequestMapping(value = "/redis/get", method = RequestMethod.GET)
@ResponseBody
public Object redisGet(){
String l = redisService.get("key2", String.class);
return l;
}
使用一个前缀来区分key
public interface KeyPrefix {
int expireSeconds();
String getKeyPrefix();
}
KeyPrefix
public abstract class BasePrefix implements KeyPrefix {
private int expireSeconds;
private String keyPrefix;
public BasePrefix(String keyPrefix) {
this(0, keyPrefix);
}
public BasePrefix(int expireSeconds, String keyPrefix) {
this.expireSeconds = expireSeconds;
this.keyPrefix = keyPrefix;
}
//默认 0 代表永不过期
@Override
public int expireSeconds() {
return expireSeconds;
}
//不同的类对应不同的prefix
@Override
public String getKeyPrefix() {
String className = getClass().getSimpleName();
return className + ": " + keyPrefix;
}
}
