远程连接Jedis和整合SpringBoot的详细过程

• 一、远程连接jedis
• 1、导入jedis所需的jar包
• 2、远程连接redis注意事项
• 3、jedis测试远程连接
• 5、jedis实现事务
• 二、整合springboot

一、远程连接jedis

1、导入jedis所需的jar包

<dependency>
      <groupid>redis.clients</groupid>
      <artifactid>jedis</artifactid>
      <version>3.2.0</version>
    </dependency>

    <dependency>
      <groupid>com.alibaba</groupid>
      <artifactid>fastjson</artifactid>
      <version>1.2.62</version>
    </dependency>

2、远程连接redis注意事项

• 禁用linux的防火墙：systemctl stop/disable firewalld.service
• 在配置文件redis.conf中注释掉bind 127.0.0.1 ,然后修改protected-mode no

3、jedis测试远程连接

package com.hcz;

import redis.clients.jedis.jedis;

public class testping {
    public static void main(string[] args) {
        jedis jedis = new jedis("49.236.195.225",6379);

        system.out.println("连接成功："+jedis.ping());
        jedis.close();
    }
}

4、常用的数据类型

（1）key

package com.hcz;

import redis.clients.jedis.jedis;

import java.util.set;

public class testkey {
    public static void main(string[] args) {
        jedis jedis = new jedis("49.236.195.225",6379);

        system.out.println("连接成功："+jedis.ping());

        system.out.println("清空数据："+jedis.flushdb());
        system.out.println("判断某个键知否存在："+jedis.exists("username"));
        system.out.println("新增<'username','hcz'>的键值对"+jedis.set("username","hcz"));
        system.out.println("新增<'password','123'>的键值对"+jedis.set("password","123"));
        system.out.println("系统中所有的键如下：");
        set<string> keys = jedis.keys("*");
        system.out.println(keys);

        system.out.println("获取username的值："+jedis.get("username"));
        system.out.println("获取password的值："+jedis.get("password"));

        system.out.println("删除键password"+jedis.del("password"));
        system.out.println("判断password是否存在："+jedis.exists("password"));

        system.out.println("查看键username所存储的值的类型："+jedis.type("username"));

        system.out.println("随机返回key空间的一个："+jedis.randomkey());

        system.out.println("重命名key："+jedis.rename("username","newname"));
        system.out.println("取出重命名后的newname:"+jedis.get("newname"));

        system.out.println("按索引查询："+jedis.select(0));

        system.out.println("清空当前数据库所有的key："+jedis.flushdb());
        system.out.println("返回当前数据库中key的数目："+jedis.dbsize());
        system.out.println("删除所有数据库中的key："+jedis.flushall());

        jedis.close();
    }
}

（2）string

package com.hcz;

import redis.clients.jedis.jedis;

import java.util.set;
import java.util.concurrent.timeunit;

public class teststring {
    public static void main(string[] args) {
        jedis jedis = new jedis("139.196.236.217",6379);

        system.out.println("连接成功："+jedis.ping());

        system.out.println("清空数据："+jedis.flushdb());
        system.out.println("====增加数据====");
        system.out.println(jedis.set("k1","v1"));
        system.out.println(jedis.set("k2","v2"));
        system.out.println(jedis.set("k3","v3"));
        system.out.println("删除键k2:"+jedis.del("k2"));
        system.out.println("获取键k2:"+jedis.get("k2"));
        system.out.println("获取键k1:"+jedis.get("k1"));
        system.out.println("修改键k3:"+jedis.set("k3","new_v3"));
        system.out.println("获取k3的值："+jedis.get("k3"));
        system.out.println("在k3后面加值："+jedis.append("k3","end"));
        system.out.println("获取k3的值："+jedis.get("k3"));
        system.out.println("增加多个键值对："+jedis.mset("k4","v4","k5","v5"));
        system.out.println("获取多个键值对："+jedis.mget("k3","k4","k5"));
        system.out.println("删除多个键值对："+jedis.del("k1","k3"));

        system.out.println("清空数据："+jedis.flushdb());
        system.out.println("====新增键值对防止覆盖原先值====");
        system.out.println(jedis.setnx("k1","v1"));
        system.out.println(jedis.setnx("k2","v2"));
        system.out.println(jedis.setnx("k2","v2-new"));
        system.out.println("获取k1的值"+jedis.get("k1"));
        system.out.println("获取k2的值"+jedis.get("k2"));

        system.out.println("====新增键值并设置有效时间====");
        system.out.println(jedis.setex("k3",2,"v3"));
        system.out.println("第一次获取k3的值"+jedis.get("k3"));

        try {
            timeunit.seconds.sleep(3);
        } catch (interruptedexception e) {
            e.printstacktrace();
        }
        system.out.println("第二次获取k3的值"+jedis.get("k3"));

        system.out.println("====获取原值，更新为新值=====");
        system.out.println(jedis.getset("k2","k2-getset"));
        system.out.println(jedis.get("k2"));

        system.out.println("获得k2的值的字串："+jedis.getrange("k2",2,4));


        jedis.close();
    }
}

（3）list

package com.hcz;

import redis.clients.jedis.jedis;

public class testlist {
    public static void main(string[] args) {
        jedis jedis = new jedis("49.236.195.225",6379);
        system.out.println("连接成功："+jedis.ping());
        system.out.println("清空数据："+jedis.flushdb());
        system.out.println("====增加一个list====");
        jedis.lpush("collections","arraylist","vector","stack","hashmap","weakhashmap","linkedhashmap");
        jedis.lpush("collections","hashset");
        jedis.lpush("collections","treeset");
        jedis.lpush("collections","treemap");
        system.out.println("collections的内容："+jedis.lrange("collections",0,-1));
        system.out.println("collections区间的0-3号元素："+jedis.lrange("collections",0,3));
        system.out.println("===========================");
        //删除指定的值，第二个参数为删除的个数（有重复时），后add进去的值先被删除，类似出栈
        system.out.println("删除指定元素个数"+jedis.lrem("collections",2,"hashmap"));
        system.out.println("collections的内容："+jedis.lrange("collections",0,-1));
        system.out.println("collections列表出栈（左端）："+jedis.lpop("collections"));
        system.out.println("collections的内容："+jedis.lrange("collections",0,-1));
        system.out.println("collections添加元素，从列表右端，与lpush相对应："+jedis.rpush("collections","list","set","string"));
        system.out.println("collections的内容："+jedis.lrange("collections",0,-1));
        system.out.println("collections列表出栈（右端）："+jedis.rpop("collections"));
        system.out.println("collections的内容："+jedis.lrange("collections",0,-1));

        system.out.println("修改collections指定下标为1的内容："+jedis.lset("collections",1,"newhashset"));
        system.out.println("collections的内容："+jedis.lrange("collections",0,-1));

        system.out.println("===============================");
        system.out.println("collections的长度："+jedis.llen("collections"));

        system.out.println("获取collections下标为2的元素："+jedis.lindex("collections",2));
        system.out.println("===============================");
        jedis.lpush("sortlist","3","5","2","8","6","0");
        system.out.println("sortlist排序前："+jedis.lrange("sortlist",0,-1));
        system.out.println(jedis.sort("sortlist"));
        system.out.println("sortlist排序后："+jedis.lrange("sortlist",0,-1));

        jedis.close();
    }
}

（4）set

package com.hcz;

import redis.clients.jedis.jedis;

import java.util.set;

public class testset {
    public static void main(string[] args) {
        jedis jedis = new jedis("49.236.195.225",6379);

        system.out.println("连接成功："+jedis.ping());

        system.out.println("清空数据："+jedis.flushdb());
        system.out.println("==========向集合中添加元素（不重复）");
        system.out.println(jedis.sadd("eleset","e1","e0","e3","e6","e5","e7","e8"));
        system.out.println(jedis.sadd("eleset","e4"));
        system.out.println(jedis.sadd("eleset","e4"));
        system.out.println("eleset的所有元素为："+jedis.smembers("eleset"));
        system.out.println("删除一个元素e0:"+jedis.srem("eleset","e0"));
        system.out.println("eleset的所有元素为："+jedis.smembers("eleset"));
        system.out.println("删除二个元素e7，e6:"+jedis.srem("eleset","e7","e6"));
        system.out.println("eleset的所有元素为："+jedis.smembers("eleset"));
        system.out.println("随机的移除集合中的一个元素："+jedis.spop("eleset"));
        system.out.println("随机的移除集合中的一个元素："+jedis.spop("eleset"));
        system.out.println("eleset的所有元素为："+jedis.smembers("eleset"));
        system.out.println("eleset的元素个数为："+jedis.scard("eleset"));
        system.out.println("e3是否存在eleset中："+jedis.sismember("eleset","e3"));
        system.out.println("e1是否存在eleset中："+jedis.sismember("eleset","e1"));
        system.out.println("e5是否存在eleset中："+jedis.sismember("eleset","e5"));
        system.out.println("==============================");

        system.out.println(jedis.sadd("eleset1","e1","e0","e3","e6","e5","e7","e8"));
        system.out.println(jedis.sadd("eleset2","e1","e0","e3","e6","e8"));
        system.out.println("将eleset1删除e1并存入eleset3中："+jedis.smove("eleset1","eleset3","e1"));
        system.out.println("将eleset1删除e2并存入eleset3中："+jedis.smove("eleset1","eleset3","e2"));
        system.out.println("eleset1的所有元素为："+jedis.smembers("eleset1"));
        system.out.println("eleset3的所有元素为："+jedis.smembers("eleset3"));

        system.out.println("================集合运算===============");
        system.out.println("eleset1的所有元素为："+jedis.smembers("eleset1"));
        system.out.println("eleset2的所有元素为："+jedis.smembers("eleset2"));
        system.out.println("eleset1和eleset2的交集："+jedis.sinter("eleset1","eleset2"));
        system.out.println("eleset1和eleset2的并集："+jedis.sunion("eleset1","eleset2"));
        system.out.println("eleset1和eleset2的差集："+jedis.sdiff("eleset1","eleset2"));
        jedis.sinterstore("eleset4","eleset1","eleset2");//求交集并保存到eleset4中
        system.out.println("eleset4的所有元素为："+jedis.smembers("eleset4"));


        jedis.close();
    }
}

（5）hash

package com.hcz;

import redis.clients.jedis.jedis;

import java.util.hashmap;
import java.util.map;

public class testhash {
    public static void main(string[] args) {
        jedis jedis = new jedis("49.236.195.225",6379);

        system.out.println("连接成功："+jedis.ping());
        system.out.println("清空数据："+jedis.flushdb());

        map<string,string> map = new hashmap<>();
        map.put("key1","v1");
        map.put("key2","v2");
        map.put("key3","v3");
        map.put("key4","v4");
        //添加名称为hash的hash元素
        jedis.hmset("hash",map);
        //向名称为hash的hash中添加key为key5,value为v5元素
        jedis.hset("hash","key5","v5");
        system.out.println("散列hash的所有键值对为："+jedis.hgetall("hash"));
        system.out.println("散列hash的所有键为："+jedis.hkeys("hash"));
        system.out.println("散列hash的所有值为："+jedis.hvals("hash"));
        system.out.println("将key6保存的值加上一个整数，如果key6不存在则添加key6:"+jedis.hincrby("hash","key6",4));
        system.out.println("散列hash的所有键值对为："+jedis.hgetall("hash"));
        system.out.println("删除一个或者多个键值对："+jedis.hdel("hash","key2","key4"));
        system.out.println("散列hash的所有键值对为："+jedis.hgetall("hash"));
        system.out.println("散列hash的所有键值对个数为："+jedis.hlen("hash"));
        system.out.println("判断hash中是否存在key2："+jedis.hexists("hash","key2"));
        system.out.println("判断hash中是否存在key3："+jedis.hexists("hash","key3"));
        system.out.println("获取hash中的值："+jedis.hget("hash","key3"));
        system.out.println("获取hash中的值："+jedis.hmget("hash","key3","key5"));

        jedis.close();
    }
}

5、jedis实现事务

（1）事务正常执行

public class testmulti {
    public static void main(string[] args) {
        jedis jedis = new jedis("49.236.195.225",6379);

        system.out.println("连接成功："+jedis.ping());
        system.out.println("清空数据："+jedis.flushdb());

        jsonobject jsonobject = new jsonobject();
        jsonobject.put("hello","world");
        jsonobject.put("name","hcz");
        //开启事务
        transaction multi = jedis.multi();
        string result = jsonobject.tojsonstring();

        try {
            multi.set("user1",result);
            multi.set("user2",result);

            multi.exec();//执行事务
        }catch (exception e){
            multi.discard();//放弃事务
            e.printstacktrace();
        }finally {
            system.out.println("user1为："+jedis.get("user1"));
            system.out.println("user2为："+jedis.get("user2"));
            jedis.close();//关闭连接
        }

    }
}

（2）事务编译时异常

public class testmulti {
    public static void main(string[] args) {
        jedis jedis = new jedis("49.236.195.225",6379);

        system.out.println("连接成功："+jedis.ping());
        system.out.println("清空数据："+jedis.flushdb());

        jsonobject jsonobject = new jsonobject();
        jsonobject.put("hello","world");
        jsonobject.put("name","hcz");
        //开启事务
        transaction multi = jedis.multi();
        string result = jsonobject.tojsonstring();

        try {
            multi.set("user1",result);
            multi.set("user2",result);

            int i = 1/0;//代码抛出异常事务，执行失败

            multi.exec();//执行事务
        }catch (exception e){
            multi.discard();//放弃事务
            e.printstacktrace();
        }finally {
            system.out.println("user1为："+jedis.get("user1"));
            system.out.println("user2为："+jedis.get("user2"));
            jedis.close();//关闭连接
        }

    }
}

二、整合springboot

1、导入依赖

说明：

在springboot2.x之后，原来使用的jedis被替换为了lettuce

jedis：采用直连，多个线程操作的话是不安全的，如果想要避免不安全，可以使用 jedis pool连接池！更像bio模式lettuce：采用netty，实例可以再多个线程共享，不存在线程不安全的情况，可以减少线程数据！更像nio模式

<dependency>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-starter-data-redis</artifactid>
</dependency>

2、配置连接

spring:
    redis:
      host: 49.236.195.225	#远程主机名
      port: 6379	#端口号
      jedis:
        pool:
          max-active: 8
          max-wait: -1ms
          max-idle: 500
          min-idle: 0
      lettuce:
        shutdown-timeout: 0ms

3、测试连接

@springboottest
class springbootredisapplicationtests {

    @autowired
    private redistemplate redistemplate;

    @test
    void contextloads() {

        //redistemplate
        //opsforvalue 操作字符串 类似string
        //opsforlist  操作list   类型list
        //opsforset
        //opsforhash
        //opsforzset
        //opsforgeo
        //opsforhyperloglog

        //获取连接对象
        redisconnection connection = redistemplate.getconnectionfactory().getconnection();
        connection.flushdb();
        //connection.flushall();

        redistemplate.opsforvalue().set("mykey","myvalue");
        system.out.println(redistemplate.opsforvalue().get("mykey"));
    }

}

4、序列化

@component
@allargsconstructor
@noargsconstructor
@data
//在企业中，我们所有的pojo都会序列化
public class user implements serializable {

    private string name;
    private int age;
}

@autowired
private redistemplate redistemplate;	

@test
public void test(){

    try {
        //真实开发一般使用json来传递对象
        user user = new user("张三 ", 18);
        //string  jsonuser = new objectmapper().writevalueasstring(user);
        redistemplate.opsforvalue().set("user",user);
        system.out.println(redistemplate.opsforvalue().get("user"));

    } catch (jsonprocessingexception e) {
        e.printstacktrace();
    }


}

5、自定义序列化

@configuration
public class redisconfig {

    //自定义了一个redistemplate
  @bean
  @suppresswarnings("all")
  public redistemplate<string, object> redistemplate(redisconnectionfactory factory) {
      //为了开发方便，一般使用<string, object>
      redistemplate<string, object> template = new redistemplate<string, object>();
      template.setconnectionfactory(factory);

      //json序列化配置
      jackson2jsonredisserializer jackson2jsonredisserializer = new jackson2jsonredisserializer(object.class);
      objectmapper om = new objectmapper();
      om.setvisibility(propertyaccessor.all, jsonautodetect.visibility.any);
      om.enabledefaulttyping(objectmapper.defaulttyping.non_final);
      jackson2jsonredisserializer.setobjectmapper(om);
      //string的序列化
      stringredisserializer stringredisserializer = new stringredisserializer();

      // key采用string的序列化方式
      template.setkeyserializer(stringredisserializer);
      // hash的key也采用string的序列化方式
      template.sethashkeyserializer(stringredisserializer);
      // value序列化方式采用jackson
      template.setvalueserializer(jackson2jsonredisserializer);
      // hash的value序列化方式采用jackson
      template.sethashvalueserializer(jackson2jsonredisserializer);
      template.afterpropertiesset();

      return template;
  }
}

6、自定义工具类

自定义工具类的好处：

已经帮我们将原生的redistemplate.opsforvalue().set() 复杂命令封装成一些简单的命令

@component
public final class redisutil {

    @autowired
    private redistemplate<string, object> redistemplate;

    // =============================common============================
    /**
     * 指定缓存失效时间
     * @param key  键
     * @param time 时间(秒)
     */
    public boolean expire(string key, long time) {
        try {
            if (time > 0) {
                redistemplate.expire(key, time, timeunit.seconds);
            }
            return true;
        } catch (exception e) {
            e.printstacktrace();
            return false;
        }
    }

…………省略后面一大堆代码…………

7、再次进行测试

@autowired
private redisutil redisutil;

@test
public void test2(){
    redisutil.set("username","hcz");
    system.out.println(redisutil.get("username"));
    redisutil.hset("hash","age",18);
    system.out.println(redisutil.hget("hash","age"));
    redisutil.hincr("hash","age",5);
    system.out.println(redisutil.hget("hash","age"));
}

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