大数据常用工具类——redisUtil

Posted 2021-10-22 Z-hhhhh

redis工具类

一、所需pom依赖

    <dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
      <version>3.7.0</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.8.0-beta0</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-simple</artifactId>
      <version>1.8.0-beta0</version>
    </dependency>

二、redis.properties

#redis服务器ip
redis_host=192.168.xxx.xxx

#redis服务端口
redis_port=6379

#redis验证密码(如果有)
redis_password=xxxx

#redis操作超时
redis_timeout=10000

#redis所选库
redis_db=1

#redis最大等待连接中的数量
redis_maxidle=10

#redis最小等待连接中的数量
redis_minidle=2

#redis最大数据库连接数
redis_maxtotal=20

三、redisUtil.java

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

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Properties;

public class redisUtil{
	//如果配置文件里有，则使用配置文件中的，若无，则使用这里的
    private static JedisPool pool = null;
    private static String ip = "localhost";
    private static int port = 6379;
    private static String auth = "";

    //配置文件地址
    private static File getPath() {
        return new File("src/main/resources/redis.properties");
    }
	
    //初始化连接池
    private static JedisPoolConfig initConfig() {
        JedisPoolConfig config = new JedisPoolConfig();
        Properties p = new Properties();
        try {

            File path = getPath();
            if (!path.exists()) {
                System.err.println("configuration file not found Exception : redis.properties");
                return config;
            }
			//读取配置文件
            p.load(new FileReader(path));

			//设置连接池，配置文件设置为默认值
            ip = p.getProperty("jedis.datasource.ip", ip);
            port = Integer.parseInt(p.getProperty("jedis.datasource.port", String.valueOf(port)));
            auth = p.getProperty("jedis.datasource.auth", auth);

            if (p.containsKey("jedis.pool.maxActive")) {
                config.setMaxTotal(Integer.parseInt(p.getProperty("jedis.pool.maxActive")));
            }

            if (p.containsKey("jedis.pool.maxIdle")) {
                config.setMaxIdle(Integer.parseInt(p.getProperty("jedis.pool.maxIdle")));
            }

            if (p.containsKey("jedis.pool.maxWait")) {
                config.setMaxWaitMillis(Integer.parseInt(p.getProperty("jedis.pool.maxWait")));
            }

            if (p.containsKey("jedis.pool.testOnBorrow")) {
                config.setTestOnBorrow(Boolean.parseBoolean(p.getProperty("jedis.pool.testOnBorrow")));
            }

            if (p.containsKey("jedis.pool.testOnReturn")) {
                config.setTestOnReturn(Boolean.parseBoolean(p.getProperty("jedis.pool.testOnReturn")));
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
        return config;
    }

    private static synchronized void initPool() {
        if (null == pool) {
            JedisPoolConfig config = initConfig();
            pool = new JedisPool(config, ip, port, 5000, auth);
        }
    }

    public static Jedis getResource() {
        if (null == pool) {
            initPool();
        }
        return pool.getResource();
    }

    public static void returnResource(Jedis resource) {
        if (null != pool) {
            pool.returnResource(resource);
        } else {
            resource.close();
        }
    }
	
    //关闭连接，一般不关闭
    public static void close() {
        if (null != pool) {
            pool.close();

        }
    }

}

四、测试工具类

RedisTest.java

public class RedisTest {
    public static void main(String[] args) {
        Jedis jedis = RedisUitl.getResource();

        jedis.set("name1","zwh");
        System.out.println(jedis.get("name1"));
        //System.out.println(jedis.ttl("name1"));

        Kedis.returnResource(jedis);
        
    }
}