Redis的Java客户端Jedis
Jedis所需的jar包：commons-pool-1.6.jar和jedis-2.1.0.jar
源码地址：http://download.csdn.net/download/qq_36135928/10216836点击打开链接
测试连通性：
public class TestPing {
publicstatic void main(String[] args) {
//连接 Redis 服务
Jedisjedis = new Jedis("192.168.237.131",6379);
//查看服务是否运行，打出PONG表示OK
System.out.println(jedis.ping());
}
}
++++++
一个key加五大数据类型
public class TestDataType {
publicstatic void main(String[] args) {
Jedisjedis = new Jedis("192.168.237.131",6381);
//key
Set<String> keys =jedis.keys("*");
for (Iterator iterator = keys.iterator();iterator.hasNext();) {
String key = (String) iterator.next();
System.out.println(key);
}
//String
jedis.set("name","clare");
System.out.println(jedis.get("name"));
jedis.mset("str1","v1","str2","v2","str3","v3");
System.out.println(jedis.mget("str1","str2","str3"));
//list
jedis.lpush("mylist","v1","v2","v3","v4","v5");
List<String> list =jedis.lrange("mylist",0,-1);
for (String element : list) {
System.out.println(element);
}
//set
jedis.sadd("orders","jd001");
jedis.sadd("orders","jd002");
jedis.sadd("orders","jd003");
Set<String> set1 =jedis.smembers("orders");
for (Iterator iterator = set1.iterator();iterator.hasNext();) {
String string = (String) iterator.next();
System.out.println(string);
}
jedis.srem("orders","jd002");
System.out.println(jedis.smembers("orders").size());
//hash
jedis.hset("hash1","userName","lisi");
System.out.println(jedis.hget("hash1","userName"));
Map<String,String> map = newHashMap<String,String>();
map.put("telphone","1111111111");
map.put("address","iponkan");
map.put("email","[email protected]");
jedis.hmset("hash2",map);
List<String> result =jedis.hmget("hash2", "telphone","email");
for (String element : result) {
System.out.println(element);
}
//zset
jedis.zadd("zset01",60d,"v1");
jedis.zadd("zset01",70d,"v2");
jedis.zadd("zset01",80d,"v3");
jedis.zadd("zset01",90d,"v4");
Set<String> s1 =jedis.zrange("zset01",0,-1);
for (Iterator iterator = s1.iterator();iterator.hasNext();) {
String string = (String)iterator.next();
System.out.println(string);
}
}
}
+++++++
事务提交：
日常
public class TestTransaction {
public boolean transMethod() {
Jedis jedis = newJedis("192.168.237.131",6381);
int balance;// 可用余额
int debt;// 欠额
int amtToSubtract = 10;// 实刷额度
jedis.watch("balance");
//jedis.set("balance","5");
balance =Integer.parseInt(jedis.get("balance"));
if (balance < amtToSubtract) {
jedis.unwatch();
System.out.println("modify");
return false;
} else {
System.out.println("***********transaction");
Transaction transaction = jedis.multi();
transaction.decrBy("balance",amtToSubtract);
transaction.incrBy("debt",amtToSubtract);
transaction.exec();
balance =Integer.parseInt(jedis.get("balance"));
debt =Integer.parseInt(jedis.get("debt"));
System.out.println("*******" +balance);
System.out.println("*******" +debt);
return true;
}
}
public static void main(String[] args) {
TestTransaction test = new TestTransaction();
boolean retValue = test.transMethod();
System.out.println("mainretValue-------: " + retValue);
}
}
加锁
public class TestWatch {
publicstatic void main(String[] args) {
Jedisjedis = new Jedis("192.168.237.131",6381);
//监控key，如果该动了事务就被放弃
jedis.watch("serialNum");
jedis.set("serialNum","s#####################");
jedis.unwatch();
Transaction transaction = jedis.multi();//被当作一个命令进行执行
Response<String> response =transaction.get("serialNum");
transaction.set("serialNum","s002");
response =transaction.get("serialNum");
transaction.lpush("list3","a");
transaction.lpush("list3","b");
transaction.lpush("list3","c");
transaction.exec();
//2 transaction.discard();
System.out.println("serialNum***********"+response.get());
}
}
/**
* 通俗点讲，watch命令就是标记一个键，如果标记了一个键， 在提交事务前如果该键被别人修改过，那事务就会失败，这种情况通常可以在程序中
* 重新再尝试一次。
* 首先标记了键balance，然后检查余额是否足够，不足就取消标记，并不做扣减； 足够的话，就启动事务进行更新操作，
* 如果在此期间键balance被其它人修改， 那在提交事务（执行exec）时就会报错， 程序中通常可以捕获这类错误再重新执行一次，直到成功。
*/
主从复制：
publicclass TestMasterSlave {
publicstatic void main(String[] args) throws InterruptedException {
Jedisjedis_M = new Jedis("192.168.237.131",6381);
Jedis jedis_S = newJedis("192.168.237.131",6379);
jedis_S.slaveof("192.168.237.131",6381);
jedis_M.set("k6","v6");
Thread.sleep(500);
System.out.println(jedis_S.get("k6"));
}
}
JedisPool：
获取Jedis实例需要从JedisPool中获取；用完Jedis实例需要返还给JedisPool；如果Jedis在使用过程中出错，则也需要还给JedisPool。
配置总结all：
JedisPool的配置参数大部分是由JedisPoolConfig的对应项来赋值的。
public class JedisPoolUtil {
privatestatic volatile JedisPool jedisPool = null;//被volatile修饰的变量不会被本地线程缓存，对该变量的读写都是直接操作共享内存。
private JedisPoolUtil() {}
public static JedisPoolgetJedisPoolInstance()
{
if(null == jedisPool)
{
synchronized (JedisPoolUtil.class)
{
if(null == jedisPool)
{
JedisPoolConfig poolConfig = newJedisPoolConfig();
poolConfig.setMaxActive(1000);
poolConfig.setMaxIdle(32);
poolConfig.setMaxWait(100*1000);
poolConfig.setTestOnBorrow(true);
jedisPool = newJedisPool(poolConfig,"192.168.237.131",6381);
}
}
}
return jedisPool;
}
public static void release(JedisPooljedisPool,Jedis jedis)
{
if(null != jedis)
{
jedisPool.returnResourceObject(jedis);
}
}
}
public class TestPollUtil {
publicstatic void main(String[] args) {
JedisPool jedisPool =JedisPoolUtil.getJedisPoolInstance();
Jedis jedis = null;
try
{
jedis = jedisPool.getResource();
jedis.set("k8","v8");
} catch (Exception e) {
e.printStackTrace();
}finally{
JedisPoolUtil.release(jedisPool, jedis);
}
}
}