Redis基础

Redis是开源的，支持网络、可基于内存也可持久化的key-value数据库，支持主从复制，读写分离，支持5种基本数据类型，高并发性能

安装redis数据库

下载：http://redis.io/download

tar zxvf redis-2.1.0

make （编译Redis）

make install （安装）

redis-server my.conf（启动服务）

redis-cli（打开控制台）

与Java集成，引入jar包如下：

JAVA-API示例：

public class RedisTest{

private Jedis jedis = null; 

    RedisTest() {
        //连接redis服务
        jedis = new Jedis("127.0.0.1", 6379);
        //jedis = new Jedis("localhost");

        //权限认证
        //jedis.auth("admin"); 

        //查看服务是否运行
        System.out.println("Server is running: "+jedis.ping());
    }

    public void testString() {
        //添加
        jedis.set("name","luangeng");

        //拼接
        jedis.append("name", " is good"); 

        //删除某个键
        jedis.del("name");  

        //设置多个键值对
        jedis.mset("name","luangeng","age","123","qq","1234");

        //增1
        jedis.incr("age");
    }

	public void testList() {
		//Remove the specified keys. returns the number of keys removed.
		jedis.del("list","key2","key3");

		// 从左边加入
		jedis.lpush("list", "5");
		// 从右边加入
		jedis.rpush("list", "0");

		jedis.rpush("list", "-1");

		jedis.rpush("list", "2");

		long n = jedis.llen("list");

		//Sort a Set or a List and Store the Result at dstkey.
		jedis.sort("list","b");
        System.out.println(jedis.lrange("list",0,-1));
        System.out.println(jedis.lrange("b",0,-1));
	}  

    public void testSet(){
    	jedis.del("set");
        //添加
        jedis.sadd("set","123");
        jedis.sadd("set","123");
        jedis.sadd("set","1");
        jedis.sadd("set","1");
        jedis.sadd("set","2");
        //移除
        jedis.srem("set","2");  

        System.out.println(jedis.scard("set"));
        System.out.println(jedis.smembers("set"));
        System.out.println(jedis.sismember("set", "123"));
    }  

    public void testMap() {
        Map<String, String> map = new HashMap<String, String>();
        map.put("k1", "v1");
        map.put("k2", "v2");
        map.put("k3", "v3");
        jedis.hmset("map",map);

        List<String> rsmap = jedis.hmget("map", "k1", "k2", "k3");
        System.out.println(rsmap);  

        jedis.hdel("k3","v3");

        Iterator<String> iter=jedis.hkeys("map").iterator();
        while (iter.hasNext()){
            String key = iter.next();
            System.out.println(key+":"+jedis.hmget("map",key));
        }  

        jedis.hlen("map");
        jedis.exists("map");
        jedis.hkeys("map");
        jedis.hvals("map");
    }

    public void flushDB(){
    	//Delete all the keys of the currently selected DB. This command never fails.
    	jedis.flushDB();

    	//Delete all the keys of all the existing databases.This command never fails.
    	//jedis.flushAll();
    }

    public static void main(String[] args) throws InterruptedException {

    	RedisTest rtest = new RedisTest();
    	rtest.testString();
    	rtest.testList();
    	rtest.testSet();
    	rtest.testMap();
    	rtest.flushDB();

   }

}