【Redis】：Jedis 使用

Redis 支持很多语言， 例如C#，RUBY,JAVA 等， Jedis是redis的java版本的客户端实现

一个简单的Jedis使用

依赖第三方包
jedis-2.7.2.jar 
commons-pool2-2.3.jar

JedisPoolManager 用户管理数据库连接，比如获取或者释放

package com.redis.jedis.project.common;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

public class JedisPoolManager {

    //private static String REDISDB_IP = "192.168.62.44";
    private static String REDISDB_IP = "127.0.0.1";
    private static int REDISDB_PORT = 6379;

    private JedisPool jedisPool;

    public JedisPoolManager() {
        JedisPoolConfig config = new JedisPoolConfig();
        config.setMaxTotal(20);
        config.setMaxIdle(5);
        config.setMaxWaitMillis(1000l);
        config.setTestOnBorrow(false);
        jedisPool = new JedisPool(config, REDISDB_IP, REDISDB_PORT);
    }

    public Jedis getJedis() throws Exception {
        try {
            Jedis jedis = jedisPool.getResource();
            return jedis;
        } catch (Exception e) {
            throw e;
        }
    }

    public void releaseJedis(Jedis jedis) {
        if (jedis != null) {
            jedis.close();
        }
    }
}

JedisManager 用户Redis数据库操作，当前只写了增删改查等常用行为

package com.redis.jedis.project.common;

import java.util.Map;

import redis.clients.jedis.Jedis;

public class JedisManager {

    private JedisPoolManager pool = new JedisPoolManager();

    protected void set(int dbIndex, String key, String value, int cashSeconds)
            throws Exception {
        Jedis jedis = null;
        try {
            jedis = pool.getJedis();
            jedis.select(dbIndex);
            jedis.set(key, value);
            if (cashSeconds > 0) {
                jedis.expire(key, cashSeconds);
            }
        } catch (Exception e) {
            throw e;
        } finally {
            pool.releaseJedis(jedis);
        }
    }

    protected String get(int dbIndex, String key) throws Exception {
        Jedis jedis = null;
        try {
            jedis = pool.getJedis();
            jedis.select(dbIndex);
            return jedis.get(key);
        } catch (Exception e) {
            throw e;
        } finally {
            pool.releaseJedis(jedis);
        }
    }

    protected void delete(int dbIndex, String key) throws Exception {
        Jedis jedis = null;
        try {
            jedis = pool.getJedis();
            jedis.select(dbIndex);
            jedis.del(key);
        } catch (Exception e) {
            throw e;
        } finally {
            pool.releaseJedis(jedis);
        }
    }

    protected Map<String, String> hgetAll(int dbIndex, String key)
            throws Exception {
        Jedis jedis = null;
        try {
            jedis = pool.getJedis();
            jedis.select(dbIndex);
            return jedis.hgetAll(key);
        } catch (Exception e) {
            System.out.println(e);
            throw e;
        } finally {
            pool.releaseJedis(jedis);
        }
    }

    protected void hset(int dbIndex, String key, String field, String value)
            throws Exception {
        Jedis jedis = null;
        try {
            jedis = pool.getJedis();
            jedis.select(dbIndex);
            jedis.hset(key, field, value);
        } catch (Exception e) {
            throw e;
        } finally {
            pool.releaseJedis(jedis);
        }
    }

    protected void hmset(int dbIndex, String key, Map<String, String> maps,
            int cacheSeconds) throws Exception {
        Jedis jedis = null;
        try {
            jedis = pool.getJedis();
            jedis.select(dbIndex);
            jedis.hmset(key, maps);
            if (cacheSeconds >= 0) {
                jedis.expire(key, cacheSeconds);
            }
        } catch (Exception e) {
            throw e;
        } finally {
            pool.releaseJedis(jedis);
        }
    }

    protected void del(int dbIndex, String key) throws Exception {
        Jedis jedis = null;
        try {
            jedis = pool.getJedis();
            jedis.select(dbIndex);
            jedis.del(key);
        } catch (Exception e) {
            throw e;
        } finally {
            pool.releaseJedis(jedis);
        }
    }

}

第一个服务接口，实现具体业务

package com.redis.jedis.project.common;

public interface ILoginCash {

	public boolean longin(LoginDTO loginDTO,int cashSeconds) throws Exception;

	public LoginDTO getLogInfo(int userId) throws Exception;

	public boolean longout(int userId) throws Exception;

}

　　

package com.redis.jedis.project.common;

import java.io.Serializable;

public class LoginDTO implements Serializable {

	private static final long serialVersionUID = 1L;
	private int userId;
	private String code;
	private String name;
	private String ip;

	public int getUserId() {
		return userId;
	}

	public void setUserId(int userId) {
		this.userId = userId;
	}

	public String getCode() {
		return code;
	}

	public void setCode(String code) {
		this.code = code;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getIp() {
		return ip;
	}

	public void setIp(String ip) {
		this.ip = ip;
	}

}

　　

实现服务接口时，同时继承JedisManager管理类，这样可以使用JedisManager封装的操作数据库的行为，为了更好的方便管理KEY名称，一般Rredis中的KEY 都是由 对象：ID 或者对象：ID:类型 等结构管理的

package com.redis.jedis.project.common;

import java.util.HashMap;
import java.util.Map;

public class LoginCashManager extends JedisManager implements ILoginCash {

	private static final String REDIS_USER = "user";

	@Override
	public boolean longin(LoginDTO loginDTO, int cashSeconds) throws Exception {

		boolean result = false;
		String key = REDIS_USER + ":" + loginDTO.getUserId();
		try {
			Map<String, String> map = new HashMap<String, String>();
			map.put("code", loginDTO.getCode());
			map.put("name", loginDTO.getName());
			map.put("ip", loginDTO.getIp());
			hmset(RedisDBConstants.USER_DB_INDEX, key, map, cashSeconds);
			result = true;
		} catch (Exception e) {
			System.out.println(e);
		}
		return result;

	}

	@Override
	public LoginDTO getLogInfo(int userId) throws Exception {
		if (userId <= 0) {
			return null;
		}
		String key = REDIS_USER + ":" + userId;
		LoginDTO loginDTO = null;
		try {
			Map<String, String> map = hgetAll(RedisDBConstants.USER_DB_INDEX,
					key);
			if (map != null && !map.isEmpty()) {
				loginDTO = new LoginDTO();
				loginDTO.setUserId(userId);
				loginDTO.setCode(map.get("code"));
				loginDTO.setName(map.get("name"));
				loginDTO.setIp(map.get("ip"));
			}
		} catch (Exception e) {
			System.out.println(e);
		}
		return loginDTO;
	}

	@Override
	public boolean longout(int userId) throws Exception {
		if (userId <= 0) {
			return false;
		}
		String tokenKey = REDIS_USER + ":" + userId;
		boolean result = false;
		try {
			del(RedisDBConstants.USER_DB_INDEX, tokenKey);
			result = true;
		} catch (Exception e) {
			System.out.println(e);
		}
		return result;

	}

}

　　

Redis默认有16个库，分别由数字 0到15编号，为方便管理，可以通过名称定义的方式以便查找

package com.redis.jedis.project.common;

public class RedisDBConstants {
	public static int SYS_DB_INDEX = 0;
	public static int USER_DB_INDEX = 1;
}

　　

测试类

package com.redis.jedis.project.common;

public class MainTestRedis {

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

		LoginCashManager logincash = new LoginCashManager();
		System.out.println("==SAVE NOW==");
		LoginDTO loginDTO = new LoginDTO();
		loginDTO.setUserId(1000);
		loginDTO.setCode("1003");
		loginDTO.setName("LIUY");
		loginDTO.setIp("127.0.0.1");
		logincash.longin(loginDTO,50);
		System.out.println("==SAVE END==");

		LoginDTO login =logincash.getLogInfo(1000);
		System.out.println("==GET INFO==");
		System.out.println("id="+login.getUserId());
		System.out.println("code="+login.getCode());
		System.out.println("name="+login.getName());
		System.out.println("loginIP="+login.getIp());
	}
}

　　

测试结果

==SAVE NOW==
==SAVE END==
==GET INFO==
id=1000
code=1003
name=LIUY
loginIP=127.0.0.1