Using Java to operate Redis requires jedis-2.1.0.jar, download address: http://files.cnblogs.com/liuling/jedis-2.1.0.jar.zip
If you need to use Redis connection pool, you also need commons-pool-1.5.4.jar, download address: http://files.cnblogs.com/liuling/commons-pool-1.5.4.jar.zip
In general, using Jedis requires the use of a connection pool to obtain connections
First, the configuration and use of the connection pool
First configure some configuration information of the jedis connection pool in spring
<bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
<property name="maxTotal" value="${redis.maxTotal}"></property>
<property name="maxIdle" value="${redis.maxIdle}"></property>
<property name="minIdle" value="${redis.minIdle}"></property>
<property name="maxWaitMillis" value="${redis.maxWaitMillis}"></property>
<property name="testOnBorrow" value="${redis.testOnBorrow}"></property>
<property name="testOnReturn" value="${redis.testOnReturn}"></property>
<property name="minEvictableIdleTimeMillis" value="${redis.minEvictableIdleTimeMillis}"></property>
<property name="numTestsPerEvictionRun" value="${redis.numTestsPerEvictionRun}"></property>
<property name="timeBetweenEvictionRunsMillis" value="${redis.timeBetweenEvictionRunsMillis}"></property>
</bean>
The specific description information of these configurations can be briefly mentioned:
maxTotal: maximum number of connections
maxIdle: the maximum number of idle connections
minIdle: Minimum number of idle connections
maxWaitMillis: The maximum number of milliseconds to wait when getting a connection,
testOnBorrow: Check validity when getting connection
testOnRetrun: Whether to perform the validate operation in advance when returning to the pool
minEvictableIdleTimeMillis: The minimum time for an object to stay in the idle state at least before it can be scanned and expelled by Idle, object evitor
numTestsPerEvictionRun: idle, object, the number of objects scanned by evitor each time
timeBetweenEvictionRunsMillis: scan interval for releasing connections
After configuring the jedis connection pool configuration, you can configure the connection pool
<bean id="jedisPool" class="redis.clients.jedis.JedisPool" destroy-method="destroy">
<constructor-arg index="0" ref="jedisPoolConfig" />
<constructor-arg index="1" value="${redis.hostName}" type="java.lang.String"/>
<constructor-arg index="2" value="${redis.port}" type="int" />
<constructor-arg index="3" value="${redis.timeout}" type="int" />
<constructor-arg index="4" value="${redis.auth}" type="java.lang.String"/>
</bean>
The connection pool configuration, name address and port password of jedis are configured here.
. Even if the connection pool is configured, then we can configure the class for obtaining the connection:
import redis.clients.jedis.Jedis;
import redis.clients.util.Pool;
public class Test {
private Pool<Jedis> redisPool;
public Pool<Jedis> getRedisPool() {
return redisPool;
}
public void setRedisPool(Pool<Jedis> redisPool) {
this.redisPool = redisPool;
}
public Jedis getJedis() {
try {
Jedis jedis = redisPool.getResource();
if (jedis == null) {
return null;
}
return jedis;
} catch (Exception e) {
}
return null;
}
public void release(Jedis jedis) {
if (jedis != null) {
jedis.close();
}
}
public void init(){
}
public static void main(String[] args) {
}
}
In this way, we can write a tool class to manage the acquisition and closure of jedis, etc.:
public static Jedis getJedis(Integer index){
Jedis jedis = null;
JedisClient jedisClient = (JedisClient)ctx.getBean("jedisClient");
if(null!=jedisClient){
jedis = jedisClient.getJedis();
}
try{
jedis.select(index);
}catch(Exception e){
jedis.select(JedisDBEnum.DEFAULT.getIndex().intValue());
log.info("getJedis index:"+index+" and default select db 0",e);
}
return jedis;
}
这一段很简单就是获取一个jedis连接，然后选择几号库，当然，用完jedis之后需要关闭连接
public static void closeJeids(Jedis jedis){
try{
if(null!=jedis){
jedis.close();
}
}catch(Exception e){
}
}
这就是通过jedis连接池获取jedis连接的全部流程了
获取到jedis之后就可以往jedis里面放数据或取数据了，在redis中放对象可以将对象序列化或者是转换成map放入，下面先列出第二种方式的例子
public class SeriaUtil {
/**
* 将对象转为map，Integer， BigDecimal Double ,Long默认值为空
* @param clazz
* @param obj
* @return
*/
@SuppressWarnings("rawtypes")
public static Map<String , String> getMapfromObject(Class<?> clazz , Object obj){
Map<String , String > map = new HashMap<String , String>();
JsonConfig jsonConfig = new JsonConfig();
jsonConfig.registerDefaultValueProcessor(Integer.class, new DefaultValueProcessor() {
@Override
public Object getDefaultValue(Class arg0) {
return null;
}
});
jsonConfig.registerDefaultValueProcessor(BigDecimal.class, new DefaultValueProcessor() {
@Override
public Object getDefaultValue(Class arg0) {
return null;
}
});
jsonConfig.registerDefaultValueProcessor(Long.class, new DefaultValueProcessor() {
@Override
public Object getDefaultValue(Class arg0) {
return null;
}
});
jsonConfig.registerDefaultValueProcessor(Double.class, new DefaultValueProcessor() {
@Override
public Object getDefaultValue(Class arg0) {
return null;
}
});
JSONObject jsonObj = JSONObject.fromObject(obj , jsonConfig);
Iterator it = jsonObj.keys();
while(it.hasNext()){
String key = String.valueOf(it.next()) ;
Object data = jsonObj.get(key);
if(null != data &&!(data instanceof JSONNull)){
map.put(key, data.toString());
}else{
map.put(key, "");
}
}
return map ;
}
@SuppressWarnings("unchecked")
public static <T> T getObjet(Jedis jedis , String key , Class<T> clazz){
Map<String , String> map =jedis.hgetAll(key);
if(map == null || map.isEmpty() ){
return null ;
}
Map<String , String > nMap = new HashMap<String , String>();
for(String keys: map.keySet()){
if(map.get(keys)!=null && !map.get(keys).equals("")){
nMap.put(keys, map.get(keys));
}
}
T t = null ;
try {
if(nMap == null || nMap.isEmpty()){
return null ;
}
Constructor<?> c = clazz.getConstructor(Map.class);
t = (T) c.newInstance(map);
} catch (Exception e) {
JSONObject json = JSONObject.fromObject(map);
t = (T) JSONObject.toBean(json,clazz);
}
return t ;
}
}
public class JedisTest {
public static void main(String[] args) {
ApplicationContext ap = new ClassPathXmlApplicationContext("main/java/conf/applicationContext.xml");
JedisClient jedisClient = (JedisClient)ap.getBean("jedisClient");
Jedis jedis = jedisClient.getJedis();
jedis.select(0);
jedis.sadd("name:123", "dengwei");
jedis.del("name:123");
SeriaBean bean = new SeriaBean ();
bean.setAge(23);
bean.setName("dengwe");
jedis.hmset("bean", SeriaUtil.getMapfromObject(SeriaBean.class, bean));
SeriaBean bb = SeriaUtil.getObjet(jedis, "bean", SeriaBean.class);
System.out.println(bb);
jedis.close();
}
}