写次随笔,给自己工作学习中记录一个笔记
废话不多说,直接上代码:
功能:将相关信息存到redis中,并设置过期时间,如果redis中有,从redis获取,如果没有,从mysql中获取。redis配置了三台集群环境
1:首先,是配置文件中相关配置信息,在java代码中,相关配置直接从配置文件中读取:
#redis配置
MaxActive=10
#最大空闲连接数
MaxIdle=5
#最小空闲连接数
MinIdle=3
#最大连接数
MaxTotal=8
#jedis集群地址A
JedisA.host=192.168.0.191
portA=6300
#jedis集群地址B
JedisB.host=192.168.0.192
portB=6300
#jedis集群地址C
JedisC.host=192.168.0.193
portC=6300
#是否先进先出
Lifo=true
#在获取连接的时候检查有效性, 默认false
TestOnBorrow=false
#用returnObject方法时,是否进行有效检查
TestOnReturn=false
#获取连接时的最大等待毫秒数
MaxWaitMillis=-1
#在空闲时检查有效性
TestWhileIdle=false
#逐出扫描的时间间隔
TimeBetweenEvictionRunsMillis=-1
#每次逐出检查时 逐出的最大数目
NumTestsPerEvictionRun=3
#逐出连接的最小空闲时间,默认10分钟
TimeMillis=600000
#用户信息过期时间为1天
userPastTime=86400
#分割时间设置过期为5分钟
LoanPastTime=300
#产品过期时间
ProductPastTime=60
2:在项目启动的时候,对redis进行初始化:
//redis初始化,JedisPoolConfig为jedis的参数对象,redis在java里封装的对象时redis,参数信息从配置文件读取
//redis初始化
JedisPoolConfig config = new JedisPoolConfig();
config.setMaxIdle(Integer.parseInt(BusinessService.getInstance().getParameter("MaxIdle")));
config.setMaxTotal(Integer.parseInt(BusinessService.getInstance().getParameter("MaxTotal")));
config.setMinIdle(Integer.parseInt(BusinessService.getInstance().getParameter("MinIdle")));
config.setLifo(Boolean.parseBoolean(BusinessService.getInstance().getParameter("Lifo")));
config.setMinEvictableIdleTimeMillis(Long.parseLong(BusinessService.getInstance().getParameter("TimeMillis")));
config.setTestOnBorrow(Boolean.parseBoolean(BusinessService.getInstance().getParameter("TestOnBorrow")));
config.setTestOnReturn(Boolean.parseBoolean(BusinessService.getInstance().getParameter("TestOnReturn")));
config.setMaxWaitMillis(Long.parseLong(BusinessService.getInstance().getParameter("MaxWaitMillis")));
config.setTestWhileIdle(Boolean.parseBoolean((BusinessService.getInstance().getParameter("TestWhileIdle"))));
config.setTimeBetweenEvictionRunsMillis(Long.parseLong(BusinessService.getInstance().getParameter("TimeBetweenEvictionRunsMillis")));
config.setNumTestsPerEvictionRun(Integer.parseInt(BusinessService.getInstance().getParameter("NumTestsPerEvictionRun")));
//RedisUtils(config)为工具类,在初始化的时候调用一次,对jedis对象进行初始化
new RedisUtils(config);
3:RedisUtils类
public RedisUtils(JedisPoolConfig config)
{
synchronized(this)
{
if(jedisCluster==null)
{
Set<HostAndPort> jedisClusterNodes = new HashSet<HostAndPort>();
jedisClusterNodes.add(new HostAndPort(BusinessService.getInstance().getParameter("JedisA.host"), Integer.parseInt(BusinessService.getInstance().getParameter("portA"))));
jedisClusterNodes.add(new HostAndPort(BusinessService.getInstance().getParameter("JedisB.host"), Integer.parseInt(BusinessService.getInstance().getParameter("portB"))));
jedisClusterNodes.add(new HostAndPort(BusinessService.getInstance().getParameter("JedisC.host"), Integer.parseInt(BusinessService.getInstance().getParameter("portC"))));
jedisCluster = new JedisCluster(jedisClusterNodes,2000,2000,config);
}
}
}
4:jedisCluster存值
/**
*
* @author weishaolong
* @date 2016-3-29 下午5:13:10 输入参数
* @param key key
* @param seconds 有效时间 单位秒
* @param strValue 值
*/
public static void setJedis(String key,int seconds,String strValue)
{
try
{
jedisCluster.setex(key,seconds,strValue);
}
catch(Exception e)
{
log.error("Redis存值异常!By:RedisUtils.setJedis"+e.toString());
}
}
5:jedisCluster取值
public static String getJedisValue(String key)
{
String strJedisVal = null;
try
{
strJedisVal=jedisCluster.get(key);
return strJedisVal;
}
catch(Exception e)
{
log.error("Redis取值异常!By:RedisUtils.getJedisValue"+e.toString());
}
return strJedisVal;
}
6:这样,使用jedisCluster就可以进行使用了,java业务代码直接RedisUtils.getJedisValue("");就可以获取值了
7:其中集群还可以使用ShardJedisPool,但是ShardJedisPool我一直报
jedis.exceptions.JedisMovedDataException: MOVED 632 192.168.0.192:6301,
报这个错的原因:ShardJedisPool是分片处理的,当为集群环境的时候,是不支持路由的,所以会报数据迁移失败
初始化:
List<JedisShardInfo> jdsInfoList =new ArrayList<JedisShardInfo>(3);
JedisShardInfo infoA = new JedisShardInfo(BusinessService.getInstance().getParameter("JedisA.host"),
Integer.parseInt(BusinessService.getInstance().getParameter("portA")));
JedisShardInfo infoB = new JedisShardInfo(BusinessService.getInstance().getParameter("JedisB.host"),
Integer.parseInt(BusinessService.getInstance().getParameter("portB")));
JedisShardInfo infoC = new JedisShardInfo(BusinessService.getInstance().getParameter("JedisC.host"),
Integer.parseInt(BusinessService.getInstance().getParameter("portC")));
jdsInfoList.add(infoA);
jdsInfoList.add(infoB);
jdsInfoList.add(infoC);
ShardJedisPool =new ShardedJedisPool(config, jdsInfoList);
存值:
public static void setJedis(String key,int seconds,String strValue)
{
try
{
ShardedJedis shardJedis=ShardJedisPool.getResource();
shardJedis.setex(key,seconds,strValue);
ShardJedisPool.returnResourceObject(shardJedis);
}
catch(Exception e)
{
log.error("Redis存值异常!By:RedisUtils.setJedis"+e.toString());
}
}
取值:
public static String getJedisValue(String key)
{
String strJedisVal = null;
try
{
ShardedJedis shardJedis=ShardJedisPool.getResource();
strJedisVal=shardJedis.get(key);
ShardJedisPool.returnResourceObject(shardJedis);
return strJedisVal;
}
catch(Exception e)
{
log.error("Redis取值异常!By:RedisUtils.getJedisValue"+e.toString());
}
return strJedisVal;
}
最后,要注意一点:ShardJedisPool是一个连接池,和mysql的连接池是很类似的,每次从池子中获取值之后,要记得把这个连接返还给池子
ShardJedisPool.returnResourceObject(redis);
项目停止的时候,关闭连接池
public static void closeJedisPool()
{
if(ShardJedisPool!=null){
ShardJedisPool.destroy();
}
}
好了,主要是代码层次的讲解,原理方面没怎么说,后期进行补充….
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