Java使用Redis

Redis的安裝略過

首先導入jedis.jar包

1.鏈接redis服務

寫個簡單的程序：

package com.fpc.Test;

import redis.clients.jedis.Jedis;

public class ManipulateRedis {
    public static void main( String[] args ) {
        //鏈接10.0.20.251的Redis服務
        Jedis jedis = new Jedis("10.0.20.251");
        
        //查看服務是否運行
        System.out.println("服務正在運行 : " + jedis.ping());
    }
}

注意：說下2個主要的坑點：

1.Redis要配置下redis.conf文件

要配置什麼呢？配置其監聽的ip地址

2.第二個要注意的就是redis-server的啓動要加參數

若是不加--protected-mode no，Java運行報錯誤：

Exception in thread "main" redis.clients.jedis.exceptions.JedisDataException: 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.
    at redis.clients.jedis.Protocol.processError(Protocol.java:127)
    at redis.clients.jedis.Protocol.process(Protocol.java:161)
    at redis.clients.jedis.Protocol.read(Protocol.java:215)
    at redis.clients.jedis.Connection.readProtocolWithCheckingBroken(Connection.java:340)
    at redis.clients.jedis.Connection.getStatusCodeReply(Connection.java:239)
    at redis.clients.jedis.BinaryJedis.ping(BinaryJedis.java:196)
    at com.fpc.Test.ManipulateRedis.main(ManipulateRedis.java:11)

正常運行的結果：

 

Redis&Java 操做元素

package com.fpc.Test;

import redis.clients.jedis.Jedis;

public class ManipulateRedis {
    public static void main( String[] args ) {
        //鏈接10.0.20.251的Redis服務
        Jedis jedis = new Jedis("10.0.20.251");
        
        //查看服務是否運行
        System.out.println("服務正在運行 : " + jedis.ping());
        
        //設置redis字符串數據
        jedis.set("fpc", "fangpengcheng");
        
        //獲取存儲的數據並輸出
        String value  = jedis.get("fpc");
        System.out.println("Redis 存儲的字符串爲  :"  + value);
    }
}

運行結果：

 

 Redis&Java 操做列表

package com.fpc.Test;

import java.util.List;

import redis.clients.jedis.Jedis;

public class ManipulateRedis {
    public static void main( String[] args ) {
        //鏈接10.0.20.251的Redis服務
        Jedis jedis = new Jedis("10.0.20.251");
        
        //查看服務是否運行
        System.out.println("服務正在運行 : " + jedis.ping());
        
        //將數據存儲到列表中,每次都是從左邊push進入list
        jedis.lpush("list", "fangpengcheng1");
        jedis.lpush("list", "fangpengcheng2");
        jedis.lpush("list", "fangpengcheng3");
        
        //獲取存儲的數據並輸出
        List<String> list = jedis.lrange("list", 0, 2);
        System.out.println(list.toString());
        
        list = jedis.lrange("list", 0, 3);
        System.out.println(list.toString());
        
        list = jedis.lrange("list", 0, 4);
        System.out.println(list.toString());
        
        list = jedis.lrange("list", 0, 5);
        System.out.println(list.toString());
        
        list = jedis.lrange("list", 0, 6);
        System.out.println(list.toString());
        
        list = jedis.lrange("list", 0, 7);
        System.out.println(list.toString());
        
        list = jedis.lrange("list", 0, 8);
        System.out.println(list.toString());
    }
}

運行的結果是：

可見若是jedis.lrange中給出的範圍是超過Redis中實際list的長度的話是會循環繼續取元素的。

 Redis&Java也能夠操做Redis中的Set，Map等，再這裏就不贅述了，查下文檔就能夠。下面打算用Redis&Java實現一個消息隊列。