Java中使用Jedis操作Redis
请使用jdk1.7版本
Jedis链接池
package com.stephen.redis; import java.util.HashMap; import java.util.List; import java.util.Map; import com.stephen.utility.DateTool; import redis.clients.jedis.Jedis; import redis.clients.jedis.JedisPool; import redis.clients.jedis.JedisPoolConfig; public class RedisUtil { //Redis服务器IP private static String ADDR = "127.0.0.1"; //Redis的端口号 private static int PORT = 6379; //访问密码 private static String AUTH = "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)。 private static int 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。 private static int 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; private static int MAX_WAIT = 10000; //超时时间 private static int TIMEOUT = 10000; //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 TEST_ON_BORROW = true; //链接池名 private static JedisPool jedisPool = null; /** * 初始化Redis连接池 */ static { try { System.out.println(DateTool.date2String()+" 初始化redis链接池:开始"); JedisPoolConfig config = new JedisPoolConfig(); config.setMaxTotal(MAX_ACTIVE);//高版本的jedis中使用 // config.setMaxActive(MAX_ACTIVE);//低版本的jedis中使用 config.setMaxIdle(MAX_IDLE); config.setMaxWaitMillis(MAX_WAIT);//高版本的jedis中使用 // config.setMaxWait(MAX_WAIT);//低版本的jedis中使用 config.setTestOnBorrow(TEST_ON_BORROW); jedisPool = new JedisPool(config, ADDR, PORT, TIMEOUT, AUTH); System.out.println(DateTool.date2String()+" 初始化redis链接池:成功"); } catch (Exception e) { e.printStackTrace(); System.out.println(DateTool.date2String()+" 初始化redis链接池:失败,请停止web服务排除故障后重新运行,错误原因:"+e.getMessage()); } } /** * 获取Jedis实例 * @return */ public synchronized static Jedis fetch() throws Exception{ return jedisPool.getResource(); } /** * 释放Jedis资源 * @param jedis */ public static void free(final Jedis jedis) { if(jedisPool==null||jedis==null) return; jedisPool.returnResource(jedis); } /** * main * @param args */ public static void main(String[] args) { Jedis mJedis =null; try { mJedis = RedisUtil.fetch(); Map<String,String> map = new HashMap<String,String>(); map.put("name", "xinxin"); map.put("age", "20"); map.put("sex", "male"); mJedis.hmset("user", map); List<String> data = mJedis.hmget("user", "name","age"); System.out.println(data); } catch (Exception e) { e.printStackTrace(); }finally{ RedisUtil.free(mJedis); } } }
基本操作例子
package com.test; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import org.junit.Before; import org.junit.Test; import redis.clients.jedis.Jedis; public class TestRedis { private Jedis jedis; @Before public void setup() { //连接redis服务器,192.168.0.100:6379 jedis = new Jedis("192.168.0.100", 6379); //权限认证 jedis.auth("admin"); } /** * redis存储字符串 */ @Test public void testString() { //-----添加数据---------- jedis.set("name","xinxin");//向key-->name中放入了value-->xinxin System.out.println(jedis.get("name"));//执行结果:xinxin jedis.append("name", " is my lover"); //拼接 System.out.println(jedis.get("name")); jedis.del("name"); //删除某个键 System.out.println(jedis.get("name")); //设置多个键值对 jedis.mset("name","liuling","age","23","qq","476777XXX"); jedis.incr("age"); //进行加1操作 System.out.println(jedis.get("name") + "-" + jedis.get("age") + "-" + jedis.get("qq")); } /** * redis操作Map */ @Test public void testMap() { //redis的map操作 String key = "user"; mJedis.del(key); //1.先创建map然后存储到redis Map<String,String> map = new HashMap<String,String>(); map.put("user1", "1"); map.put("user2", "2"); map.put("user3", "3"); mJedis.hmset(key, map); Log.out(mJedis.hgetAll(key).toString()); //输出:{user1=1, user2=2, user3=3} mJedis.del(key); //2.直接将key-value值存到redis中 mJedis.hset(key, "man01", "01"); mJedis.hset(key, "man02", "02"); mJedis.hset(key, "man03", "03"); Log.out(mJedis.hgetAll(key).toString()); //输出:{man03=03, man02=02, man01=01} //判断map中的key是否存在 Log.out("map中存在man01吗?"+mJedis.hexists(key, "man01")); Log.out("map中存在man02吗?"+mJedis.hexists(key, "man02")); Log.out("map中存在man03吗?"+mJedis.hexists(key, "man03")); Log.out("map中存在man04吗?"+mJedis.hexists(key, "man04")); //输出:map中存在man01吗?true //输出:map中存在man02吗?true //输出:map中存在man03吗?true //输出:map中存在man04吗?false //-----添加数据---------- Map<String, String> map = new HashMap<String, String>(); map.put("name", "xinxin"); map.put("age", "22"); map.put("qq", "123456"); jedis.hmset("user",map); //取出user中的name,执行结果:[minxr]-->注意结果是一个泛型的List //第一个参数是存入redis中map对象的key,后面跟的是放入map中的对象的key,后面的key可以跟多个,是可变参数 List<String> rsmap = jedis.hmget("user", "name", "age", "qq"); System.out.println(rsmap); //删除map中的某个键值 jedis.hdel("user","age"); System.out.println(jedis.hmget("user", "age")); //因为删除了,所以返回的是null System.out.println(jedis.hlen("user")); //返回key为user的键中存放的值的个数2 System.out.println(jedis.exists("user"));//是否存在key为user的记录 返回true System.out.println(jedis.hkeys("user"));//返回map对象中的所有key System.out.println(jedis.hvals("user"));//返回map对象中的所有value Iterator<String> iter=jedis.hkeys("user").iterator(); while (iter.hasNext()){ String key = iter.next(); System.out.println(key+":"+jedis.hmget("user",key)); } } /** * jedis操作List */ @Test public void testList(){ //开始前,先移除所有的内容 jedis.del("java framework"); System.out.println(jedis.lrange("java framework",0,-1)); //先向key java framework中存放三条数据 jedis.lpush("java framework","spring"); jedis.lpush("java framework","struts"); jedis.lpush("java framework","hibernate"); //再取出所有数据jedis.lrange是按范围取出, // 第一个是key,第二个是起始位置,第三个是结束位置,jedis.llen获取长度 -1表示取得所有 System.out.println(jedis.lrange("java framework",0,-1)); jedis.del("java framework"); jedis.rpush("java framework","spring"); jedis.rpush("java framework","struts"); jedis.rpush("java framework","hibernate"); System.out.println(jedis.lrange("java framework",0,-1)); } /** * jedis操作Set */ @Test public void testSet(){ //添加 jedis.sadd("user","liuling"); jedis.sadd("user","xinxin"); jedis.sadd("user","ling"); jedis.sadd("user","zhangxinxin"); jedis.sadd("user","who"); //移除noname jedis.srem("user","who"); System.out.println(jedis.smembers("user"));//获取所有加入的value System.out.println(jedis.sismember("user", "who"));//判断 who 是否是user集合的元素 System.out.println(jedis.srandmember("user")); System.out.println(jedis.scard("user"));//返回集合的元素个数 } @Test public void test() throws InterruptedException { //jedis 排序 //注意,此处的rpush和lpush是List的操作。是一个双向链表(但从表现来看的) jedis.del("a");//先清除数据,再加入数据进行测试 jedis.rpush("a", "1"); jedis.lpush("a","6"); jedis.lpush("a","3"); jedis.lpush("a","9"); System.out.println(jedis.lrange("a",0,-1));// [9, 3, 6, 1] System.out.println(jedis.sort("a")); //[1, 3, 6, 9] //输入排序后结果 System.out.println(jedis.lrange("a",0,-1)); } @Test public void testRedisPool() { RedisUtil.getJedis().set("newname", "中文测试"); System.out.println(RedisUtil.getJedis().get("newname")); } }