Java連接遠程Redis

1. 安裝redis server

騰訊雲直接運行： yum install redis-server ，沒有yum源也可以直接wget下載。

 

redis-server &  //后台啟動redis

redis-cli //使用redis

 

打開redis.conf文件在 NETWORK部分有說明   /usr/local/src

 

################################## NETWORK #####################################

 

# By default, if no "bind" configuration directive is specified, Redis listens

# for connections from all the network interfaces available on the server.

# It is possible to listen to just one or multiple selected interfaces using

# the "bind" configuration directive, followed by one or more IP addresses.

#

# Examples:

#

# bind 192.168.1.100 10.0.0.1

# bind 127.0.0.1 ::1

#

# ~~~ WARNING ~~~ If the computer running Redis is directly exposed to the

# internet, binding to all the interfaces is dangerous and will expose the

# instance to everybody on the internet. So by default we uncomment the

# following bind directive, that will force Redis to listen only into

# the IPv4 lookback interface address (this means Redis will be able to

# accept connections only from clients running into the same computer it

# is running).

#

# IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES

# JUST COMMENT THE FOLLOWING LINE.

# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

bind 127.0.0.1

 

解決辦法：注釋掉bind 127.0.0.1可以使所有的ip訪問redis

若是想指定多個ip訪問，但並不是全部的ip訪問，可以bind

 

注意

下面還有個說明

 

# Protected mode is a layer of security protection, in order to avoid that

# Redis instances left open on the internet are accessed and exploited.

#

# When protected mode is on and if:

#

# 1) The server is not binding explicitly to a set of addresses using the

#    "bind" directive.

# 2) No password is configured.

#

# The server only accepts connections from clients connecting from the

# IPv4 and IPv6 loopback addresses 127.0.0.1 and ::1, and from Unix domain

# sockets.

#

# By default protected mode is enabled. You should disable it only if

# you are sure you want clients from other hosts to connect to Redis

# even if no authentication is configured, nor a specific set of interfaces

# are explicitly listed using the "bind" directive.

protected-mode yes

 

 

在redis3.2之后，redis增加了protected-mode，在這個模式下，即使注釋掉了bind 127.0.0.1，再訪問redisd時候還是報錯，如下

 

(error) DENIED Redis is running in protected mode because protected mode is enabled, no bind address was specified, no authentication password is requested to clients. In this mode connections are only accepted from the loopback interface. If you want to connect from external computers to Redis you may adopt one of the following solutions: 1) Just disable protected mode sending the command 'CONFIG SET protected-mode no' from the loopback interface by connecting to Redis from the same host the server is running, however MAKE SURE Redis is not publicly accessible from internet if you do so. Use CONFIG REWRITE to make this change permanent. 2) Alternatively you can just disable the protected mode by editing the Redis configuration file, and setting the protected mode option to 'no', and then restarting the server. 3) If you started the server manually just for testing, restart it with the '--protected-mode no' option. 4) Setup a bind address or an authentication password. NOTE: You only need to do one of the above things in order for the server to start accepting connections from the outside.

 

修改辦法：protected-mode no

同時設置redis密碼，使用密碼登錄

 

 2. Java 連接Redis

現在redis運行了，使用代碼連接：

/**
 * Created by bin on 2016/12/12.
 */
import  redis.clients.jedis.Jedis;

public class Main {
    static String constr = "123.206.212.***" ;
    public static Jedis getRedis(){
        Jedis jedis = new Jedis(constr) ;
        jedis.auth("123");
        return jedis ;
    }
    public static void main(String[] args){
        Jedis j = Main. getRedis() ;
        String output ;
        j.set( "hello", "world" ) ;
        output = j.get( "hello") ;
        System. out.println(output) ;
    }
}

 

 Redis連接池：

package com.test;

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

public final class RedisUtil {
    
    //Redis服務器IP
    private static String ADDR = "192.168.0.100";
    
    //Redis的端口號
    private static int PORT = 6379;
    
    //訪問密碼
    private static String AUTH = "admin";
    
    //可用連接實例的最大數目，默認值為8；
    //如果賦值為-1，則表示不限制；如果pool已經分配了maxActive個jedis實例，則此時pool的狀態為exhausted(耗盡)。
    private static int MAX_ACTIVE = 1024;
    
    //控制一個pool最多有多少個狀態為idle(空閑的)的jedis實例，默認值也是8。
    private static int MAX_IDLE = 200;
    
    //等待可用連接的最大時間，單位毫秒，默認值為-1，表示永不超時。如果超過等待時間，則直接拋出JedisConnectionException；
    private static int MAX_WAIT = 10000;
    
    private static int TIMEOUT = 10000;
    
    //在borrow一個jedis實例時，是否提前進行validate操作；如果為true，則得到的jedis實例均是可用的；
    private static boolean TEST_ON_BORROW = true;
    
    private static JedisPool jedisPool = null;
    
    /**
     * 初始化Redis連接池
     */
    static {
        try {
            JedisPoolConfig config = new JedisPoolConfig();
            config.setMaxActive(MAX_ACTIVE);
            config.setMaxIdle(MAX_IDLE);
            config.setMaxWait(MAX_WAIT);
            config.setTestOnBorrow(TEST_ON_BORROW);
            jedisPool = new JedisPool(config, ADDR, PORT, TIMEOUT, AUTH);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    /**
     * 獲取Jedis實例
     * @return
     */
    public synchronized static Jedis getJedis() {
        try {
            if (jedisPool != null) {
                Jedis resource = jedisPool.getResource();
                return resource;
            } else {
                return null;
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    
    /**
     * 釋放jedis資源
     * @param jedis
     */
    public static void returnResource(final Jedis jedis) {
        if (jedis != null) {
            jedisPool.returnResource(jedis);
        }
    }
}