redis代码连接及遇到的问题

Posted 2020-11-02 四季常青

package com.study.util;

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

public class RedisUtil {

    private static final String host = "192.168.150.129";
    
    private static final int port = 6379;
    
    private static final String password = "1234";
    
    private static JedisPool jedisPool;
    
    
    public static Jedis getJedis() {
        
        JedisPoolConfig config = new JedisPoolConfig(); 
        config.setMaxTotal(20); 
        config.setMaxIdle(5); 
        config.setTestOnBorrow(false); 
        
        jedisPool = new JedisPool(config,host, port,3000,password);
        Jedis jedis = jedisPool.getResource(); 
        String code = jedis.auth(password); //如果没有配置密码验证，这注掉这句话
        //System.out.println("auth code :" + code);
        jedis.select(1);//选择第二个数据库演示
        return jedis;
    }
    
    
    
    public static void main(String[] args) {
        Jedis jedis = getJedis();
        jedis.close();
    }
    
}

redis连接时遇到的问题：Caused by: java.net.ConnectException: Connection refused: connect

Exception in thread "main" redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
    at redis.clients.util.Pool.getResource(Pool.java:53)
    at redis.clients.jedis.JedisPool.getResource(JedisPool.java:226)
    at com.study.util.RedisUtil.main(RedisUtil.java:50)
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused: connect
    at redis.clients.jedis.Connection.connect(Connection.java:207)
    at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93)
    at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1767)
    at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:106)
    at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:889)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:433)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:362)
    at redis.clients.util.Pool.getResource(Pool.java:49)
    ... 2 more
Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at redis.clients.jedis.Connection.connect(Connection.java:184)

View Code

解决方法：

查看是否将默认只能本地访问redis改为所有IP均可以访问

bind 127.0.0.1 改为 bind 0.0.0.0 

修改redis的配置文件redis.conf 将bind改为0.0.0.0 

遇到的问题二：Caused by: java.net.SocketTimeoutException: connect timed out

Exception in thread "main" redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
    at redis.clients.util.Pool.getResource(Pool.java:53)
    at redis.clients.jedis.JedisPool.getResource(JedisPool.java:226)
    at com.study.util.RedisUtil.getJedis(RedisUtil.java:29)
    at com.study.util.RedisUtil.main(RedisUtil.java:39)
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: java.net.SocketTimeoutException: connect timed out
    at redis.clients.jedis.Connection.connect(Connection.java:207)
    at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93)
    at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1767)
    at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:106)
    at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:889)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:433)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:362)
    at redis.clients.util.Pool.getResource(Pool.java:49)
    ... 3 more
Caused by: java.net.SocketTimeoutException: connect timed out
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at redis.clients.jedis.Connection.connect(Connection.java:184)
    ... 10 more

View Code

解决方法：

• 1.关闭防火墙

• systemctl stop firewalld.service

   

• 2   .开启6379一个端口

• firewall-cmd --zone=public --add-port=6379/tcp --permanent

  --permanent永久生效，没有此参数重启后失效

• 重新载入

firewall-cmd --reload

 

代码git地址：https://gitee.com/sjcq/redis.git