RedisUtil: Jedis连接自动释放

package cloud.app.prod.home.utils;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;


public class RedisUtil {

    // Redis服务器IP
    private static String ADDR = "127.0.0.1";

    // Redis的端口号
    private static int PORT = 6379;

    // 访问密码
    private static String AUTH = "scrm__12345";

    // 可用连接实例的最大数目,默认值为8;
    // 如果赋值为-1,则表示不限制;如果pool已经分配了maxActive个jedis实例,则此时pool的状态为exhausted(耗尽)。

    private static int MAX_ACTIVE = 1024;

    // 控制一个pool最多有多少个状态为idle(空闲的)的jedis实例,默认值也是8。
    private static int MAX_IDLE = 200;

    // 等待可用连接的最大时间,单位毫秒,默认值为-1,表示永不超时。如果超过等待时间,则直接抛出JedisConnectionException;
    private static int MAX_WAIT = 10000;
    private static int TIMEOUT = 10000;

    // 在borrow一个jedis实例时,是否提前进行validate操作;如果为true,则得到的jedis实例均是可用的;
    private static boolean TEST_ON_BORROW = true;

    private static JedisPool jedisPool = null;

  
    /**
     * 初始化Redis连接池
     */
    static {
        try {
            JedisPoolConfig config = new JedisPoolConfig();
            config.setMaxActive(MAX_ACTIVE);
            config.setMaxIdle(MAX_IDLE);
            config.setMaxWait(MAX_WAIT);
            config.setTestOnBorrow(TEST_ON_BORROW);
            jedisPool = new JedisPool(config, ADDR, PORT, TIMEOUT, AUTH);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 获取Jedis实例
     * 
     * @return
     */
    public synchronized static Jedis getJedis() {
        try {
            if (jedisPool != null) {
                Jedis resource = jedisPool.getResource();
                return resource;
            } else {
                return null;
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 释放jedis资源
     * 
     * @param jedis
     */
    public static void returnResource(final Jedis jedis) {
        if (jedis != null) {
            jedisPool.returnResource(jedis);
        }
    } 
  
    /** 
     * Jedis对象出异常的时候,回收Jedis对象资源 
     *  
     * @param jedis 
     */  
    public static void returnBrokenResource(final Jedis jedis) {  
        if (jedis != null) {  
            jedisPool.returnBrokenResource(jedis);  
        }  
  
    }  
    
    /**
     * 通过Redis的key获取值,并释放连接资源
     * @param key
     * @return 成功返回value,失败返回null
     */
    public static String get(String key) {
        Jedis jedis = null;
        String value = null;

        try {
            jedis = getJedis();
            if (null != jedis) {
                value = jedis.get(key);
            }            
        } catch (Exception e) {
            returnBrokenResource(jedis);
            e.printStackTrace();
        } finally {
            returnResource(jedis);
        }
        return value; 
    }
    
    /**
     * 向redis存入key和value(如果key已经存在 则覆盖),并释放连接资源
     * @param key
     * @param value
     */
    public static void set(String key, String value) {
        Jedis jedis = null;
        try {
            jedis = getJedis();
            if (null != jedis) {
                jedis.set(key, value);
            }            
        } catch (Exception e) {
            returnBrokenResource(jedis);
            e.printStackTrace();
        } finally {
            returnResource(jedis);        
        } 
    }
    
    /**
     * 向redis存入key和value(如果key已经存在 则覆盖),并且设置存活时间,及释放连接资源
     * @param key
     * @param value
     * @param seconds
     */
    public static void set(String key, String value, int seconds) {
        Jedis jedis = null;
        try {
            jedis = getJedis();
            if (null != jedis) {
                jedis.set(key, value);
                jedis.expire(key, seconds);
            }            
        } catch (Exception e) {
            returnBrokenResource(jedis);
            e.printStackTrace();
        } finally {
            returnResource(jedis);        
        } 
    }

    public static String byte2hex(byte[] buffer) {
        String h = "0x";
        for (byte aBuffer : buffer) {
            String temp = Integer.toHexString(aBuffer & 0xFF);
            if (temp.length() == 1) {
                temp = "0" + temp;
            }
            h = h + " " + temp;
        }
        return h;
    }

}
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原文地址:https://www.cnblogs.com/BobXie85/p/8962219.html