JedisPool的配置参数很大程度上依赖于实际应用需求、软硬件能力,JedisPool的配置参数大部分是由JedisPoolConfig的对应项来赋值的。
maxActive:控制一个pool可分配多少个jedis实例,通过pool.getResource()来获取;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的状态就成exhausted了,在JedisPoolConfig
maxIdle:控制一个pool最多有多少个状态为idle的jedis实例;
whenExhaustedAction:表示当pool中的jedis实例都被allocated完时,pool要采取的操作;默认有三种WHEN_EXHAUSTED_FAIL(表示无jedis实例时,直接抛出NoSuchElementException)、WHEN_EXHAUSTED_BLOCK(则表示阻塞住,或者达到maxWait时抛出JedisConnectionException)、WHEN_EXHAUSTED_GROW(则表示新建一个jedis实例,也就说设置的maxActive无用);
maxWait:表示当borrow一个jedis实例时,最大的等待时间,如果超过等待时间,则直接抛出JedisConnectionException;
testOnBorrow:在borrow一个jedis实例时,是否提前进行alidate操作;如果为true,则得到的jedis实例均是可用的;
testOnReturn:在return给pool时,是否提前进行validate操作;
testWhileIdle:如果为true,表示有一个idle object evitor线程对idle object进行扫描,如果validate失败,此object会被从pool中drop掉;这一项只有在timeBetweenEvictionRunsMillis大于0时才有意义;
timeBetweenEvictionRunsMillis:表示idle object evitor两次扫描之间要sleep的毫秒数;
numTestsPerEvictionRun:表示idle object evitor每次扫描的最多的对象数;
minEvictableIdleTimeMillis: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;
softMinEvictableIdleTimeMillis:在minEvictableIdleTimeMillis基础上,加入了至少minIdle个对象已经在pool里面了。如果为-1,evicted不会根据idle time驱逐任何对象。如果minEvictableIdleTimeMillis>0,则此项设置无意义,且只有在timeBetweenEvictionRunsMillis大于0时才有意义;
lifo:borrowObject返回对象时,是采用DEFAULT_LIFO(last in first out,即类似cache的最频繁使用队列),如果为False,则表示FIFO队列;
其中JedisPoolConfig对一些参数的默认设置如下:
testWhileIdle=true
minEvictableIdleTimeMills=60000
timeBetweenEvictionRunsMillis=30000
numTestsPerEvictionRun=-1
package com.ecbt.util.redis;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.Set;
import com.ecbt.util.CoreUtils;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
/**
* Redis的工具类
*
* @ClassName: RedisUtil
* @author sunbaojin
* @date 2017-11-06 15:07:55
*/
public final class RedisUtil {
public static InputStream in = null;
public static Properties prop = new Properties();
/**
* 读取配置文件
*
* @Title: readConfigInfo
* @date 2017-12-18 10:47:05 void
* @author sunbaojin
*/
private static void readConfigInfo() {
try {
String userHome = System.getenv("user_home");
if (CoreUtils.notNull(userHome)) {
// 获取配置文件路径信息
in = new FileInputStream(userHome + "/fta-redis.properties");
prop.load(in);
RedisUtil.REDIS_URL = prop.getProperty("redis.url");
RedisUtil.REDIS_PORT = Integer.parseInt(prop.getProperty("redis.port"));
RedisUtil.REDIS_PASSWORD = prop.getProperty("redis.password");
RedisUtil.REDIS_MAX_IDLE = Integer.parseInt(prop.getProperty("redis.maxIdle"));
RedisUtil.REDIS_MAX_WAIT = Integer.parseInt(prop.getProperty("redis.maxWait"));
RedisUtil.REDIS_TIMEOUT = Integer.parseInt(prop.getProperty("redis.timeout"));
in.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Redis服务器IP
*/
public static String REDIS_URL = "192.168.40.22";
/**
* Redis的端口号
*/
public static int REDIS_PORT = 6379;
/**
* 访问密码
*/
public static String REDIS_PASSWORD = "admin";
/**
* 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)。
**/
public static int REDIS_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。
*/
public static int REDIS_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;
*/
public static int REDIS_MAX_WAIT = 10000;
/**
* 超时时间
*/
public static int REDIS_TIMEOUT = 100000;
/**
* 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 REDIS_TEST_ON_BORROW = true;
/**
* 实例
*/
private static JedisPool jedisPool = null;
/**
* 初始化Redis连接池
*/
static {
try {
readConfigInfo();
JedisPoolConfig config = new JedisPoolConfig();
config.setMaxTotal(REDIS_MAX_ACTIVE);
config.setMaxIdle(REDIS_MAX_IDLE);
config.setMaxWaitMillis(REDIS_MAX_WAIT);
config.setTestOnBorrow(REDIS_TEST_ON_BORROW);
// jedisPool = new JedisPool(config, ADDR, PORT, TIMEOUT, REDIS_PASSWORD);
jedisPool = new JedisPool(config, REDIS_URL, REDIS_PORT, REDIS_TIMEOUT);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 获取Jedis实例
*
* @return
*/
private 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
*/
private static void close(final Jedis jedis) {
if (jedis != null) {
jedis.close();
}
}
/**
* Set the string value as value of the key. The string can't be longer than
* 1073741824 bytes (1 GB).
*
* @Title: addJsonData
* @date 2017-11-07 08:59:46
* @param jsonDataKey
* json数据的key
* @param jsonData
* json数据
* @author sunbaojin
*/
public static void addJsonData(String jsonDataKey, String jsonData) {
// 向jedis存放数据
if (jsonData != null) {
Jedis jedis = RedisUtil.getJedis();
try {
// 开始前,先移除所有的内容
jedis.del(jsonDataKey);
jedis.set(jsonDataKey, jsonData);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭单个资源信息,使用完毕就释放这个资源
close(jedis);
}
}
}
/**
* Set a timeout on the specified key. After the timeout the key will be
* automatically deleted by the server. A key with an associated timeout is said
* to be volatile in Redis terminology.
*
* @Title: expire
* @date 2017-12-25 13:36:36
* @param redisKey
* redis中的key
* @param seconds
* 超时的时间(以秒为单位) void
* @author sunbaojin
*/
public static void expire(String redisKey, int seconds) {
// 向jedis存放数据
if (redisKey != null) {
Jedis jedis = RedisUtil.getJedis();
try {
// 如果存在,设置超时时间
if (jedis.exists(redisKey)) {
// 开始前,先移除所有的内容
jedis.expire(redisKey, seconds);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭单个资源信息,使用完毕就释放这个资源
close(jedis);
}
}
}
/**
* Return all the fields in a hash.
*
* @Title: hkeys
* @date 2017-12-25 13:56:21
* @param redisKey
* redis中的key
* @return Set<String> All the fields names contained into a hash.
* @author sunbaojin
*/
public static Set<String> hkeys(String redisKey) {
Set<String> hkeySet = null;
Jedis jedis = RedisUtil.getJedis();
try {
hkeySet = jedis.hkeys(redisKey);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭单个资源信息,使用完毕就释放这个资源
close(jedis);
}
return hkeySet;
}
/**
* 根据key删除redis中的数据
*
* @Title: del
* @date 2017-12-25 13:48:40
* @param redisKey
* redis中的key void
* @author sunbaojin
*/
public static void del(String redisKey) {
// 向jedis存放数据
if (redisKey != null) {
Jedis jedis = RedisUtil.getJedis();
try {
jedis.del(redisKey);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭单个资源信息,使用完毕就释放这个资源
close(jedis);
}
}
}
/**
* Set the specified hash field to the specified value. If key does not exist, a
* new key holding a hash is created.
*
* @Title: hset
* @date 2017-12-25 13:51:26
* @param key
* redis的key
* @param field
* 字段
* @param value
* 字段值 void
* @author sunbaojin
*/
public static void hset(String key, String field, String value) {
Jedis jedis = RedisUtil.getJedis();
try {
jedis.hset(key, field, value);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭单个资源信息,使用完毕就释放这个资源
close(jedis);
}
}
/**
* Returns all the keys matching the glob-style pattern as space separated
* strings. For example if you have in the database the keys "foo" and "foobar"
* the command "KEYS foo*" will return "foo foobar".
*
* @Title: redisKeys
* @date 2017-12-25 13:44:54
* @param pattern
* @return Set<String>
* @author sunbaojin
*/
public static Set<String> keys(String pattern) {
Set<String> keySet = null;
Jedis jedis = RedisUtil.getJedis();
try {
keySet = jedis.keys(pattern);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭单个资源信息,使用完毕就释放这个资源
close(jedis);
}
return keySet;
}
/**
* Test if the specified key exists. The command returns "1" if the key exists,
* otherwise "0" is returned. Note that even keys set with an empty string as
* value will return "1". Time complexity: O(1)
*
* @Title: checkRedisKeyExists
* @date 2017-12-25 13:41:11
* @param redisKey
* redis中的key
* @return Boolean
* @author sunbaojin
*/
public static Boolean exists(String redisKey) {
Boolean isExists = false;
// 向jedis存放数据
if (redisKey != null) {
Jedis jedis = RedisUtil.getJedis();
try {
// 判断redis中的key是否存在
isExists = jedis.exists(redisKey);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭单个资源信息,使用完毕就释放这个资源
close(jedis);
}
}
return isExists;
}
/**
* Get the value of the specified key. If the key does not exist null is
* returned. If the value stored at key is not a string an error is returned
* because GET can only handle string values.
*
* @Title: getJsonData
* @date 2017-11-07 09:01:02
* @param jsonDataKey
* json对象的key
* @return String json对象
* @author sunbaojin
*/
public static String getJsonData(String jsonDataKey) {
Jedis jedis = RedisUtil.getJedis();
String jsonData = null;
try {
jsonData = jedis.get(jsonDataKey);
} catch (Exception e) {
e.printStackTrace();
} finally {
close(jedis);
}
return jsonData;
}
/**
* 加载所有的字典项信息
*
* @Title: loadAllDictData
* @date 2017-11-22 13:47:27 void
* @author sunbaojin
*/
public static void loadAllDictData() {
// 加载所有的字典项
SysDictTool.readAndWriteDictFiles();
}
public static void main(String[] args) {
String userHome = System.getenv("user_home");
System.out.println(userHome);
Jedis jedis = RedisUtil.getJedis();
// jedis.flushAll();
// 查看服务是否运行
System.out.println("服务正在运行: " + jedis.ping());
try {
Set<String> dictSubList = jedis.keys("*");
for (String string : dictSubList) {
System.out.println(string);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
RedisUtil.close(jedis);
}
System.out.println(RedisUtil.getJedis().get("FTA_SYS0000021"));
}
}