Java中使用Jedis操作Redis
2017-06-04 16:44
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如果是用
apt-get或者
yum install安装的redis,可以直接通过下面的命令停止/启动/重启redis
/etc/init.d/redis-server stop /etc/init.d/redis-server start /etc/init.d/redis-server restart如果是通过源码安装的redis,则可以通过redis的客户端程序
redis-cli的
shutdown命令来重启redis
redis-cli -h 127.0.0.1 -p 6379 shutdown如果上述方式都没有成功停止redis,则可以使用终极武器
kill -9
通过Jedis客户端连接不到redis
之前我的一篇文章,也是解决Jedis连接不到redis的,但是情况不一样,之前的问题主要是防火墙的问题,但是现在看来并不是防火墙的问题,因为redis自身也有配置来限制外网的访问,所以当时也不知道为什么就可以了,今天主要以redis配置的角度来看一下,如何解决外网访问redis的问题。首先还是描述一下问题:[java] viewplain copy public static void main(String[] args) { Jedis jedis = new Jedis("192.168.1.118", 6380); System.out.println(jedis); jedis.ping(); } 上面是测试代码,下面是报错信息:[java] viewplain copy Exception in thread "main" 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.Connection.sendCommand(Connection.java:126) at redis.clients.jedis.Connection.sendCommand(Connection.java:121) at redis.clients.jedis.BinaryClient.ping(BinaryClient.java:106) at redis.clients.jedis.BinaryJedis.ping(BinaryJedis.java:195) at com.atguigu.redis.test.TestPing.main(TestPing.java:10) 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) ... 6 more 首先,通过查看linux的防火墙,看看是否是防火墙搞的鬼:[java] viewplain copy [root@localhost ~]# systemctl status firewalld ● firewalld.service - firewalld - dynamic firewall daemon Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled) Active: inactive (dead) 结果是这样的,inactive是不活动的意思,和active相反,这个比较好理解。然后使用windows的telnet来试一下,上一篇关于远程连接redis的文章中没有关于telnet的信息,这次不上,[java] viewplain copy C:\Users\Administrator>telnet 192.168.1.118 6379 结果当然也是连不上了,然后就只能请教万能的百度大哥了:[java] viewplain copy 原来是redis默认只能localhost登录,所以需要开启远程登录。解决方法如下: 在redis的配置文件redis.conf中,找到bind localhost注释掉。 注释掉本机,局域网内的所有计算机都能访问。 band localhost 只能本机访问,局域网内计算机不能访问。 bind 局域网IP 只能局域网内IP的机器访问, 本地localhost都无法访问。 上面是从别的地方找到的内容,虽然不是很具体,但是指明了方向,那就是redis.conf,所以[java] viewplain copy ################################## 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 bind 192.168.1.118 # 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: # 上面是redis.conf中的内容[java] viewplain copy bind 192.168.1.118 是我后来添加的,也就是加了这句话之后,才可以正常的访问了。[java] viewplain copy public static void main(String[] args) { Jedis jedis = new Jedis("192.168.1.118", 6379); System.out.println(jedis); String ping = jedis.ping(); System.out.println(ping); } [java] viewplain copy redis.clients.jedis.Jedis@6ff3c5b5 PONG <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.9.0</version></dependency>使用Java操作Redis需要jedis-2.1.0.jar,下载地址:http://files.cnblogs.com/liuling/jedis-2.1.0.jar.zip如果需要使用Redis连接池的话,还需commons-pool-1.5.4.jar,下载地址:http://files.cnblogs.com/liuling/commons-pool-1.5.4.jar.zip1 package com.test;23 import java.util.HashMap;4 import java.util.Iterator;5 import java.util.List;6 import java.util.Map;78 import org.junit.Before;9 import org.junit.Test;1011 import redis.clients.jedis.Jedis;1213 public class TestRedis {14 private Jedis jedis;1516 @Before17 public void setup() {18 //连接redis服务器,192.168.0.100:637919 jedis = new Jedis("192.168.0.100", 6379);20 //权限认证21 jedis.auth("admin");22 }2324 /**25 * redis存储字符串26 */27 @Test28 public void testString() {29 //-----添加数据----------30 jedis.set("name","xinxin");//向key-->name中放入了value-->xinxin31 System.out.println(jedis.get("name"));//执行结果:xinxin3233 jedis.append("name", " is my lover"); //拼接34 System.out.println(jedis.get("name"));3536 jedis.del("name"); //删除某个键37 System.out.println(jedis.get("name"));38 //设置多个键值对39 jedis.mset("name","liuling","age","23","qq","476777XXX");40 jedis.incr("age"); //进行加1操作41 System.out.println(jedis.get("name") + "-" + jedis.get("age") + "-" + jedis.get("qq"));4243 }4445 /**46 * redis操作Map47 */48 @Test49 public void testMap() {50 //-----添加数据----------51 Map<String, String> map = new HashMap<String, String>();52 map.put("name", "xinxin");53 map.put("age", "22");54 map.put("qq", "123456");55 jedis.hmset("user",map);56 //取出user中的name,执行结果:[minxr]-->注意结果是一个泛型的List57 //第一个参数是存入redis中map对象的key,后面跟的是放入map中的对象的key,后面的key可以跟多个,是可变参数58 List<String> rsmap = jedis.hmget("user", "name", "age", "qq");59 System.out.println(rsmap);6061 //删除map中的某个键值62 jedis.hdel("user","age");63 System.out.println(jedis.hmget("user", "age")); //因为删除了,所以返回的是null64 System.out.println(jedis.hlen("user")); //返回key为user的键中存放的值的个数265 System.out.println(jedis.exists("user"));//是否存在key为user的记录 返回true66 System.out.println(jedis.hkeys("user"));//返回map对象中的所有key67 System.out.println(jedis.hvals("user"));//返回map对象中的所有value6869 Iterator<String> iter=jedis.hkeys("user").iterator();70 while (iter.hasNext()){71 String key = iter.next();72 System.out.println(key+":"+jedis.hmget("user",key));73 }74 }7576 /**77 * jedis操作List78 */79 @Test80 public void testList(){81 //开始前,先移除所有的内容82 jedis.del("java framework");83 System.out.println(jedis.lrange("java framework",0,-1));84 //先向key java framework中存放三条数据85 jedis.lpush("java framework","spring");86 jedis.lpush("java framework","struts");87 jedis.lpush("java framework","hibernate");88 //再取出所有数据jedis.lrange是按范围取出,89 // 第一个是key,第二个是起始位置,第三个是结束位置,jedis.llen获取长度 -1表示取得所有90 System.out.println(jedis.lrange("java framework",0,-1));9192 jedis.del("java framework");93 jedis.rpush("java framework","spring");94 jedis.rpush("java framework","struts");95 jedis.rpush("java framework","hibernate");96 System.out.println(jedis.lrange("java framework",0,-1));97 }9899 /**100 * jedis操作Set101 */102 @Test103 public void testSet(){104 //添加105 jedis.sadd("user","liuling");106 jedis.sadd("user","xinxin");107 jedis.sadd("user","ling");108 jedis.sadd("user","zhangxinxin");109 jedis.sadd("user","who");110 //移除noname111 jedis.srem("user","who");112 System.out.println(jedis.smembers("user"));//获取所有加入的value113 System.out.println(jedis.sismember("user", "who"));//判断 who 是否是user集合的元素114 System.out.println(jedis.srandmember("user"));115 System.out.println(jedis.scard("user"));//返回集合的元素个数116 }117118 @Test119 public void test() throws InterruptedException {120 //jedis 排序121 //注意,此处的rpush和lpush是List的操作。是一个双向链表(但从表现来看的)122 jedis.del("a");//先清除数据,再加入数据进行测试123 jedis.rpush("a", "1");124 jedis.lpush("a","6");125 jedis.lpush("a","3");126 jedis.lpush("a","9");127 System.out.println(jedis.lrange("a",0,-1));// [9, 3, 6, 1]128 System.out.println(jedis.sort("a")); //[1, 3, 6, 9] //输入排序后结果129 System.out.println(jedis.lrange("a",0,-1));130 }131132 @Test133 public void testRedisPool() {134 RedisUtil.getJedis().set("newname", "中文测试");135 System.out.println(RedisUtil.getJedis().get("newname"));136 }137 }Redis连接池:
1 package com.test;23 import redis.clients.jedis.Jedis;4 import redis.clients.jedis.JedisPool;5 import redis.clients.jedis.JedisPoolConfig;67 public final class RedisUtil {89 //Redis服务器IP10 private static String ADDR = "192.168.0.100";1112 //Redis的端口号13 private static int PORT = 6379;1415 //访问密码16 private static String AUTH = "admin";1718 //可用连接实例的最大数目,默认值为8;19 //如果赋值为-1,则表示不限制;如果pool已经分配了maxActive个jedis实例,则此时pool的状态为exhausted(耗尽)。20 private static int MAX_ACTIVE = 1024;2122 //控制一个pool最多有多少个状态为idle(空闲的)的jedis实例,默认值也是8。23 private static int MAX_IDLE = 200;2425 //等待可用连接的最大时间,单位毫秒,默认值为-1,表示永不超时。如果超过等待时间,则直接抛出JedisConnectionException;26 private static int MAX_WAIT = 10000;2728 private static int TIMEOUT = 10000;2930 //在borrow一个jedis实例时,是否提前进行validate操作;如果为true,则得到的jedis实例均是可用的;31 private static boolean TEST_ON_BORROW = true;3233 private static JedisPool jedisPool = null;3435 /**36 * 初始化Redis连接池37 */38 static {39 try {40 JedisPoolConfig config = new JedisPoolConfig();41 config.setMaxActive(MAX_ACTIVE);42 config.setMaxIdle(MAX_IDLE);43 config.setMaxWait(MAX_WAIT);44 config.setTestOnBorrow(TEST_ON_BORROW);45 jedisPool = new JedisPool(config, ADDR, PORT, TIMEOUT, AUTH);46 } catch (Exception e) {47 e.printStackTrace();48 }49 }5051 /**52 * 获取Jedis实例53 * @return54 */55 public synchronized static Jedis getJedis() {56 try {57 if (jedisPool != null) {58 Jedis resource = jedisPool.getResource();59 return resource;60 } else {61 return null;62 }63 } catch (Exception e) {64 e.printStackTrace();65 return null;66 }67 }6869 /**70 * 释放jedis资源71 * @param jedis72 */73 public static void returnResource(final Jedis jedis) {74 if (jedis != null) {75 jedisPool.returnResource(jedis);76 }77 }78 }
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