企业级-实现Redis封装层

作者：fyupeng
技术专栏：☞ https://github.com/fyupeng
项目地址：☞ https://github.com/fyupeng/distributed-blog-system-api

---

留给读者

封装 Redis 客户端Dao层、分布式锁等。

一、介绍

二、代码

DataInitialLoadRunner.java

/**
 * @ClassName: DataInitialLoadRunner
 * @Description: 程序启动时初始化加载操作
 *
 */
@Component
@Order(value = 1)
public class DataInitialLoadRunner implements CommandLineRunner {

protected final static Logger logger = LoggerFactory.getLogger(DataInitialLoadRunner.class);

@Autowired
    private ApplicationContext context;
/**
 * 执行程序启动时初始化加载操作
 * 
 * @param args
 * @throws Exception
 * @see CommandLineRunner#run(String[])
 */
@Override
public void run(String... args) throws Exception {
logger.info(">>>>>>>>>common系统初始化数据操作开始<<<<<<<<<<");
// 开始时间
long begin = System.currentTimeMillis();
//获取当前启动参数
CoreConstants.PROFILE_NAME = context.getEnvironment().getActiveProfiles()[0];
logger.info(">>>>>>>>>当前启动参数："+CoreConstants.PROFILE_NAME);

// 加载redis连接池
RedisManager.init();
// 加载获取gwssi-core.properties配置文件
ResourceBundle torchBundle = ResourceBundle.getBundle("gwssi-core");

//电子文书文件参数初始化设置
CoreConstants.DOC_APPLY_DATASOURCE_KEY=torchBundle.getString("doc.apply.datasource.key"); //申请端电子文书数据源key
CoreConstants.DOC_REDIS_DBINDEX = Integer.parseInt(torchBundle.getString("doc.redis.index")); // redis库ID
CoreConstants.DOC_CONFIG_PATH = torchBundle.getString("doc.config.path"); // 电子文书xml文件路径
CoreConstants.DOC_BASE_URL_PATH = torchBundle.getString("doc.base.url.path");

//CoreConstants.FILE_IDENTITY_PATH= torchBundle.getString("file.identity.path"); //身份认证文件上传路径
String initLoad = torchBundle.getString("init.load");
// 检查程序每次启动时是否都要再加载一遍XML文件放入缓存中
if (StringUtil.isNotBlank(initLoad.trim()) && "true".equals(initLoad.trim())) {
logger.info("文书配置加载完成");
}

long end = System.currentTimeMillis(); // 结束时间
logger.info(">>>>>>>>>系统初始化数据操作结束:" + (end - begin) + "ms<<<<<<<<<<");
}

}

RedisManager.java

/**
 * redis连接池获取数据源连接
 *
 */
public class RedisManager {

    private static Pool<Jedis> pool;

    protected final static Logger logger = LoggerFactory.getLogger(RedisManager.class);

    /**
     * 初始化redis连接池连接
     */
    public static void init() throws Exception {
        // 加载读取application.properties文件
        String profile = CoreConstants.PROFILE_NAME;
        String profilename = "application";
        if (StringUtils.isNotBlank(profile)) {
            profilename += ("-" + profile);
        }
        logger.info("profilename=" + profilename);
        ResourceBundle torchBundle = ResourceBundle.getBundle(profilename);
        //>>>>>>>>初始化Redis连接池<<<<<<<<
        if (torchBundle == null) {
            throw new RuntimeException("没有找到redis配置文件");
        }
        String host = torchBundle.getString("spring.redis.host"); // redis IP地址
        int port = Integer.valueOf(torchBundle.getString("spring.redis.port")); // 端口号
        String password = "";
        if (torchBundle.containsKey("spring.redis.password")) {
            password = torchBundle.getString("spring.redis.password"); // 密码
        }

        logger.info("redis.host=" + host + "----redis.port=" + port);
        // 创建jedis池配置实例
        JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
        // 设置池配置项值
        // 最大连接数
        int poolMaxTotal = Integer.valueOf(torchBundle.getString("spring.redis.maxActive").trim());
        jedisPoolConfig.setMaxTotal(poolMaxTotal);
        // 最大空闲连接数
        int poolMaxIdle = Integer.valueOf(torchBundle.getString("spring.redis.maxIdle").trim());
        int poolMinIdle = Integer.valueOf(torchBundle.getString("spring.redis.MinIdle").trim());
        jedisPoolConfig.setMaxIdle(poolMaxIdle);
        jedisPoolConfig.setMinIdle(poolMinIdle);
        jedisPoolConfig.setMaxTotal(200);
        // 获取连接时的最大等待毫秒数,小于零:阻塞不确定的时间,默认-1
        long poolMaxWaitMillis = Long.valueOf(torchBundle.getString("spring.redis.maxWaitMillis").trim());
        jedisPoolConfig.setMaxWaitMillis(poolMaxWaitMillis);
        //拿到连接的时候是否进行校验操作
        jedisPoolConfig.setTestOnBorrow(true);
        //连接归还池进行校验
        jedisPoolConfig.setTestOnReturn(true);
//表示idle object evitor两次扫描之间要sleep的毫秒数
        jedisPoolConfig.setTimeBetweenEvictionRunsMillis(30000);
//表示idle object evitor每次扫描的最多的对象数
        jedisPoolConfig.setNumTestsPerEvictionRun(10);
//表示一个对象至少停留在idle状态的最短时间，然后才能被idle object evitor扫描并驱逐；这一项只有在timeBetweenEvictionRunsMillis大于0时才有意义
        jedisPoolConfig.setMinEvictableIdleTimeMillis(60000);

        // 添加连接池
        if (StringUtils.isNotBlank(password)) {
            int timeOut = Integer.valueOf(torchBundle.getString("spring.redis.timeOut")); // 超时时间
            pool = new JedisPool(jedisPoolConfig, host, port, timeOut, password);
        } else {
            pool = new JedisPool(jedisPoolConfig, host, port);
        }
        logger.info("redis 初始化完成");
    }

    /**
     * 获取Jedis对象
     *
     * @return
     */
    public static Jedis getResource() {

        Jedis jedis = pool.getResource();
        return jedis;
    }

    /**
     * 获取Jedis对象
     *
     * @param db 数据库序号
     * @return
     */
    public static Jedis getResource(int db) {
        //索引0 =线程
        //索引1 =这个
        //索引2 =直接呼叫者，可以是自己。
        //索引3 ... n =相互调用以获得索引2及以下的类和方法。
/*StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
for (int i = 0; i < stackTrace.length; i++)
{
StackTraceElement s = stackTrace[i];
System.out.format(" ClassName:%d\t%s\n", i, s.getClassName());
System.out.format("MethodName:%d\t%s\n", i, s.getMethodName());
System.out.format("  FileName:%d\t%s\n", i, s.getFileName());
System.out.format("LineNumber:%d\t%s\n\n", i, s.getLineNumber());
}*/
        Jedis jedis = pool.getResource();
        jedis.select(db);
        return jedis;
    }


    /**
     * 销毁
     *
     * @throws Exception
     */
    public static void destroy() throws Exception {
        pool.destroy();
    }
}

Redis工具类

/**
 * redis工具类
 *
 */
public class RedisUtils {

    protected final static Logger logger = LoggerFactory.getLogger(RedisUtils.class);
    private static final long sleepTime = 100L;

    /**
     * 根据dbindex删除缓存
     *
     * @param dbIndex
     */
    public static void flushDB(int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            jedis.flushDB();
        } catch (Exception e) {
            logger.error("redis-flushDB异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
    }

    /**
     * set集合
     *
     * @param key
     * @param value
     */
    public static void set(String key, Object value, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            if (value instanceof String) {
                jedis.set(key, String.valueOf(value));
            } else {
                jedis.set(key.getBytes(), serialize(value));
            }
        } catch (Exception e) {
            logger.error("redis-set异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
    }

    /**
     * set集合, 有过期时间
     *
     * @param key
     * @param value
     * @param second
     */
    public static void setex(String key, int second, Object value, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            if (value instanceof String) {
                jedis.setex(key, second, String.valueOf(value));
            } else {
                jedis.setex(key.getBytes(), second, serialize(value));
            }
        } catch (Exception e) {
            logger.error("redis-set异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
    }

    /**
     * @param 参数
     * @return void    返回类型
     * @throws
     * @Title: expire
     * @Description: 设置时间
     */
    public static void expire(String key, int secends, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            jedis.expire(key.getBytes(), secends);
        } catch (Exception e) {
            logger.error("redis-expire异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
    }

    /**
     * 从redis缓存中获取key的值
     */
    public static String get(String key, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            return jedis.get(key);
        } catch (Exception e) {
            logger.error("redis-get异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
        return null;
    }

    /**
     * @param 参数
     * @return Object    返回类型
     * @throws
     * @Title: get
     * @Description: key查询返回Object对象
     */
    public static Object get(byte[] key, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            logger.info("redis取值:" + key.toString());
            return unserialize(jedis.get(key));
        } catch (Exception e) {
            logger.error("redis-get异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
        return null;
    }

    /**
     * 根据key删除缓存
     *
     * @param key
     */
    public static void delete(String[] key, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            logger.info("redis删除:" + key);
            jedis.del(key);
        } catch (Exception e) {
            logger.error("redis-delete异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
    }

    /**
     * 设置 map
     *
     * @param <T>
     * @param key
     * @param value
     */
    public static <T> void setMap(String key, Map<String, T> map, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            jedis.set(key.getBytes(), serialize(map));
        } catch (Exception e) {
            logger.error("redis-setMap异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
    }

    /**
     * 获取list
     *
     * @param <T>
     * @param key
     * @return list
     */
    public static <T> Map<String, T> getMap(String key, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            if (jedis == null || !jedis.exists(key.getBytes())) {
                return null;
            }
            byte[] in = jedis.get(key.getBytes());
            @SuppressWarnings("unchecked")
            Map<String, T> map = (Map<String, T>) unserialize(in);
            return map;
        } catch (Exception e) {
            logger.error("redis-getMap异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
        return null;
    }

    /**
     * 设置object
     *
     * @param <T>
     * @param key
     * @param object
     */
    public static <T> void setObject(String key, Object object, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            jedis.set(key.getBytes(), serialize(object));
        } catch (Exception e) {
            logger.error("redis-setObject异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
    }

    /**
     * 获取object
     *
     * @param <T>
     * @param key
     * @return list
     */
    public static <T> T getObject(String key, int dbIndex) {
        Jedis jedis = null;
        Object object = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            if (jedis == null || !jedis.exists(key.getBytes())) {
                return null;
            }
            byte[] in = jedis.get(key.getBytes());
            object = unserialize(in);
        } catch (Exception e) {
            logger.error("redis-getObject异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
        return object==null?null:(T)object;
    }

    /**
     * 设置 String
     *
     * @param key
     * @param value
     */
    public static void setString(String key, String value, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            // value = StringUtil.isNullOrEmpty(value) ? "" : value;
            jedis.set(key, value);
        } catch (Exception e) {
            logger.error("redis-setString异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
    }

    /**
     * 设置 过期时间
     *
     * @param key
     * @param seconds 以秒为单位
     * @param value
     */
    public static void setString(String key, int seconds, String value, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            // value = StringUtil.isNullOrEmpty(value) ? "" : value;
            jedis.setex(key, seconds, value);
        } catch (Exception e) {
            logger.error("redis-setString异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
    }

    /**
     * 获取String值
     *
     * @param key
     * @return value
     */
    public static String getString(String key, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            if (jedis == null || !jedis.exists(key)) {
                return null;
            }
            return jedis.get(key);
        } catch (Exception e) {
            logger.error("redis-getString异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
        return null;
    }

    /**
     * 设置 list
     *
     * @param <T>
     * @param key
     * @param list
     */
    public static <T> void setList(String key, List<T> list, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            jedis.set(key.getBytes(), serialize(list));
        } catch (Exception e) {
            logger.error("redis-setList异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
    }

    /**
     * 获取list
     *
     * @param <T>
     * @param key
     * @return list
     */
    @SuppressWarnings("unchecked")
    public static <T> List<T> getList(String key, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            if (jedis == null || !jedis.exists(key.getBytes())) {
                return null;
            }
            byte[] in = jedis.get(key.getBytes());
            List<T> list = (List<T>) unserialize(in);
            return list;
        } catch (Exception e) {
            logger.error("redis-getList异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
        return null;
    }

    public static byte[] getbyte(String key, int secends, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            if (null == jedis.get(key.getBytes())) {
                return null;
            } else {
                // 更新过期时间
                jedis.expire(key, secends);// 1小时
            }
            return jedis.get(key.getBytes());
        } catch (Exception e) {
            logger.error("session取Redis出现错误", e);
            return null;
        } finally {
            jedis.close();
        }

    }

    /*
     * 序列化对象
     */
    public static byte[] serialize(Object value) {
        if (value == null) {
            throw new NullPointerException("Can't serialize null");
        }
        byte[] rv = null;
        ByteArrayOutputStream bos = null;
        ObjectOutputStream os = null;
        try {
            bos = new ByteArrayOutputStream();
            os = new ObjectOutputStream(bos);
            os.writeObject(value);
            rv = bos.toByteArray();
        } catch (IOException e) {
            logger.error("redis-serialize异常", e);
            throw new IllegalArgumentException("Non-serializable object", e);
        } finally {
            try {
                if (os != null)
                    os.close();
                if (bos != null)
                    bos.close();
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return rv;
    }

    /**
     * 反序列化对象
     *
     * @return Object
     */
    public static Object unserialize(byte[] in) {
        Object rv = null;
        ByteArrayInputStream bis = null;
        ObjectInputStream is = null;
        try {
            if (in != null) {
                bis = new ByteArrayInputStream(in);
                is = new ObjectInputStream(bis);
                rv = is.readObject();
            }
        } catch (Exception e) {
            logger.error("redis-unserialize异常", e);
        } finally {
            try {
                if (is != null)
                    is.close();
                if (bis != null)
                    bis.close();
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return rv;
    }

    public static Long incr(String key, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            if (jedis == null) {
                return null;
            }
            return jedis.incr(key);
        } catch (Exception e) {
            logger.error("redis-getString异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
        return null;
    }

    /**
     * Jedis执行Lua脚本，获取结果
     *
     * @param lua     Lua字符串
     * @param keys    keys
     * @param args    其他Lua需要参数
     * @param dbIndex 索引
     * @return
     */
    public static Object evalLua(String lua, List<String> keys, List<String> args, int dbIndex) {
        Jedis jedis = null;
        try {
            jedis = RedisManager.getResource(dbIndex);
            if (jedis == null) {
                return null;
            }
            return jedis.eval(lua, keys, args);
        } catch (Exception e) {
            logger.error("redis-执行Lua异常", e);
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
        return null;
    }

    /**
     * 自定义获取锁的超时时间
     *
     * @param key
     * @param timeout
     * @param waitTime
     * @param timeUnit
     * @return
     * @throws InterruptedException
     */
    public static boolean tryLock(String key, int timeout, long waitTime, TimeUnit timeUnit) throws InterruptedException {
        try (Jedis jedis = RedisManager.getResource(LOCK_DB_INDEX)) {
            long timeoutSeconds = timeUnit.toSeconds(timeout);
            long waitTimeMicroSeconds = timeUnit.toMicros(waitTime);
            while (waitTimeMicroSeconds >= 0) {
                String result = jedis.set(key, "1", "nx", "ex", timeoutSeconds);
                if ("OK".equals(result)) {
                    return true;
                }
                waitTimeMicroSeconds -= sleepTime;
                Thread.sleep(sleepTime);
            }
        } catch (Exception e) {
            logger.error("redis-setString异常", e);
        }
        return false;
    }

    /**
     * 使用Lua脚本进行解锁操纵，解锁的时候验证value值
     *
     * @param key
     * @return
     */
    public static void unlock(String key) {
        try (Jedis jedis = RedisManager.getResource(LOCK_DB_INDEX)) {
            String luaScript = "if redis.call('get',KEYS[1]) == ARGV[1] then " +
                    "return redis.call('del',KEYS[1]) else return 0 end";
            jedis.eval(luaScript, Collections.singletonList(key), Collections.singletonList("1")).equals(1L);
        } catch (Exception e) {
            logger.error("redis-setString异常", e);
        }
    }

}

三、总结

简洁

原文地址：https://blog.csdn.net/F15217283411/article/details/143568532

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