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;
    }
}