Java連接Redis

Jedis Client是Redis官網(wǎng)推薦的一個(gè)面向java客戶端，庫文件實(shí)現(xiàn)了對redis各類API進(jìn)行封裝調(diào)用.

引入jar包

我創(chuàng)建的是maven項(xiàng)目，所以只用在pom文件中加入

<!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
		<dependency>
			<groupId>redis.clients</groupId>
			<artifactId>jedis</artifactId>
			<version>3.0.0</version>
		</dependency>

如果不是maven項(xiàng)目，你要確定引入相關(guān)依賴

編寫測試類

package cn.jiangdoc;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
/**
 * 
 * @author jiangdoc
 *
 */
public class JedisUtil {
	public static void main(String[] args) {
	//ip地址，端口號
		Jedis jedis = cli_single("192.168.1.103", 6379);
		jedis.set("key", "first Java connect!");
		String value = jedis.get("key");
		System.out.println(value);
		
	}
	/**
	 * 單個(gè)連接
	 * 
	 * @param host
	 * @param port
	 * @return
	 */
	public static Jedis cli_single(String host, int port) {
		try {
			return new Jedis(host, port);
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}
	/**
	 * 連接池
	 * 
	 * @param host
	 * @param port
	 * @return
	 */
	public static Jedis cli_pool(String host, int port) {
		JedisPoolConfig config = new JedisPoolConfig();
		// 最大連接數(shù)
		config.setMaxTotal(10);
		// 最大連接空閑數(shù)
		config.setMaxIdle(2);
		JedisPool jedisPool = new JedisPool(config, host, port);
		try{
			
			return jedisPool.getResource();
		}catch(Exception e){
			e.printStackTrace();
			return null;
		}
	}
}

注意：如果出現(xiàn)

報(bào)錯(cuò)：Exception in thread “main” redis.clients.jedis.exceptions.JedisConnectionException:

檢查端口是否開放

解決方法：

• 1.關(guān)閉防火墻：service iptables stop
• 2.開放端口：

（1.修改配置文件：vi /etc/sysconfig/iptabls 追加：-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 6379-j ACCEPT

（2.包存改變：service iptables save

（3.重啟服務(wù)：service iptables restart

查看redis的配置文件

報(bào)錯(cuò)：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.

報(bào)錯(cuò)信息很長，但是主要是說redis開啟了protected mode，這也是Redis3.2加入的新特性，開啟保護(hù)模式的redis只允許本機(jī)登錄，同樣設(shè)置在配置文件redis.conf中

這里原來是yes代表開啟了保護(hù)模式，后面可以填密碼也可以填no代表關(guān)閉，我們這里選擇關(guān)閉保護(hù)模式，wq保存退出后再重啟redis-server

下面再運(yùn)行就可以了

Jedis常用方法API

前段時(shí)間給大家介紹了如何在Linux環(huán)境下部署和操作redis，今天將為大家介紹如何在我們的Java代碼中操作redis。接下來 按部就班：

一、首先把 jedis-2.1.0.jar（jedis基礎(chǔ)包）

導(dǎo)入到 java項(xiàng)目里

二、創(chuàng)建 jedis對象

三、鍵操作

四、字符串操作

五、整數(shù)和浮點(diǎn)數(shù)操作

六、列表（List）操作

七、集合（Set）操作

八、哈希（Hash）操作

九、有序集合（Zsort）操作

十、排序操作

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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