Redis Java client Jedis
Jar packages required by Jedis: commons-pool-1.6.jar and jedis-2.1.0.jar
Source address: http://download.csdn.net/download/qq_36135928/10216836Click to open the link
Test connectivity:
public class TestPing {
publicstatic void main(String[] args) {
//Connect to Redis service
Jedisjedis = new Jedis("192.168.237.131",6379);
//Check whether the service is running, and print PONG to indicate OK
System.out.println(jedis.ping());
}
}
++++++
A key plus five data types
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);
}
}
}
+++++++
Transaction commit:
daily
public class TestTransaction {
public boolean transMethod() {
Jedis jedis = newJedis("192.168.237.131",6381);
int balance; // available balance
int debt; // debt
int amtToSubtract = 10;// Actual brush amount
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);
}
}
lock
public class TestWatch {
publicstatic void main(String[] args) {
Jedisjedis = new Jedis("192.168.237.131",6381);
//Monitor the key, if the transaction should be moved, it will be abandoned
jedis.watch("serialNum");
jedis.set("serialNum","s#####################");
jedis.unwatch();
Transaction transaction = jedis.multi();//Executed as a command
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());
}
}
/**
* In layman's terms, the watch command is to mark a key. If a key is marked, if the key is modified by others before committing the transaction, the transaction will fail. This situation can usually be done in the program.
* Try again.
* First mark the key balance, and then check whether the balance is sufficient. If the balance is insufficient, cancel the mark without deduction; if it is enough, start the transaction to perform the update operation.
* If the key balance is modified by others during this period, it will report an error when submitting the transaction (executing exec). The program can usually catch such errors and re-execute it again until it succeeds.
*/
Master-slave replication:
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：
To obtain a Jedis instance, it needs to be obtained from the JedisPool; when the Jedis instance is used up, it needs to be returned to the JedisPool; if the Jedis makes an error during use, it also needs to be returned to the JedisPool.
Configuration summary all:
Most of the configuration parameters of JedisPool are assigned by the corresponding items of JedisPoolConfig.
public class JedisPoolUtil {
privatestatic volatile JedisPool jedisPool = null;//The variable modified by volatile will not be cached by the local thread, and the read and write of the variable are all direct operations on the shared memory.
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);
}
}
}