AI专业者开发社区 1 号成员
  •  0 回帖  •  0 浏览  •  5 个月前
   

Java操作Redis

Redis

　　Redis 是完全开源免费的，遵守 BSD 协议，是一个高性能的 key-value 数据库。

　　Redis 与其他 key - value 缓存产品有以下三个特点：

　　Redis 支持数据的持久化，可以将内存中的数据保存在磁盘中，重启的时候可以再次加载进行使用。

　　Redis 不仅仅支持简单的 key-value 类型的数据，同时还提供 list，set，zset，hash 等数据结构的存储。

　　Redis 支持数据的备份，即 master-slave 模式的数据备份。

Redis 应用场景

   主要能够体现 解决数据库的访问压力。

   例如: 短信验证码时间有效期、session 共享解决方案

Redis 优势

　　性能极高

　　　　Redis 能读的速度是 110000 次 /s, 写的速度是 81000 次 /s 。

　　丰富的数据类型

　　　　Redis 支持二进制案例的 Strings, Lists, Hashes, Sets 及 Ordered Sets 数据类型操作。

　　原子

　　　　Redis 的所有操作都是原子性的，同时 Redis 还支持对几个操作全并后的原子性执行。

　　丰富的特性

　　　　Redis 还支持 publish/subscribe, 通知, key 过期等等特性。

Java 操作 Redis

Redis Jedis

<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>2.9.0</version>
</dependency>
<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-redis</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-redis</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId> 
</dependency>

目录结构

 

 主程序

@SpringBootApplication
public class StartApplication {
    public static void main(String[] args) {
        SpringApplication.run(StartApplication.class,args);}
}

Service

@Service
public class SpringBootRedis {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

</span><span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">void</span> <span style="color: rgba(0, 0, 255, 1)">set</span><span style="color: rgba(0, 0, 0, 1)">(String key,Object value){
    </span><span style="color: rgba(0, 0, 255, 1)">if</span><span style="color: rgba(0, 0, 0, 1)">(value instanceof String){
        stringRedisTemplate.opsForValue().</span><span style="color: rgba(0, 0, 255, 1)">set</span>(key,(String) value,<span style="color: rgba(128, 0, 128, 1)">200L</span><span style="color: rgba(0, 0, 0, 1)">, TimeUnit.SECONDS);
    }</span><span style="color: rgba(0, 0, 255, 1)">else</span> <span style="color: rgba(0, 0, 255, 1)">if</span><span style="color: rgba(0, 0, 0, 1)">(value instanceof List){
        List</span>&lt;String&gt; list=<span style="color: rgba(0, 0, 0, 1)">(List)value;
        </span><span style="color: rgba(0, 0, 255, 1)">for</span><span style="color: rgba(0, 0, 0, 1)">(String item:list){
            stringRedisTemplate.opsForList().leftPush(key,item);
        }
    }</span><span style="color: rgba(0, 0, 255, 1)">else</span> <span style="color: rgba(0, 0, 255, 1)">if</span><span style="color: rgba(0, 0, 0, 1)">(value instanceof Set){
        String [] objects</span>=(String[])((Set) value).toArray(<span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> String[((Set) value).size()]);
        stringRedisTemplate.opsForSet().add(key,objects);
    }</span><span style="color: rgba(0, 0, 255, 1)">else</span> <span style="color: rgba(0, 0, 255, 1)">if</span><span style="color: rgba(0, 0, 0, 1)">(value instanceof Map){
        stringRedisTemplate.opsForHash().putAll(key,(Map</span>&lt;?,?&gt;<span style="color: rgba(0, 0, 0, 1)">) value);
    }
}



}

Controller

@RestController
public class RedisController {
    @Resource
    private SpringBootRedis springBootRedis;

@RequestMapping(</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">/setString</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">)
</span><span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">void</span><span style="color: rgba(0, 0, 0, 1)"> setString(){
    System.</span><span style="color: rgba(0, 0, 255, 1)">out</span>.println(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">梅川酷子</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
    springBootRedis.</span><span style="color: rgba(0, 0, 255, 1)">set</span>(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">key01</span><span style="color: rgba(128, 0, 0, 1)">"</span>,<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">v01</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
}

@RequestMapping(</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">/setList</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">)
</span><span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">void</span><span style="color: rgba(0, 0, 0, 1)"> setList(){
    List</span>&lt;String&gt; list=<span style="color: rgba(0, 0, 255, 1)">new</span> ArrayList&lt;&gt;<span style="color: rgba(0, 0, 0, 1)">();
    list.add(</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">v1</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
    list.add(</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">v2</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
    list.add(</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">v3</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
    springBootRedis.</span><span style="color: rgba(0, 0, 255, 1)">set</span>(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">setlist</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">,list);
}

@RequestMapping(</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">/setSet</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">)
</span><span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">void</span><span style="color: rgba(0, 0, 0, 1)"> setSet(){
    Set</span>&lt;String&gt; <span style="color: rgba(0, 0, 255, 1)">set</span>=<span style="color: rgba(0, 0, 255, 1)">new</span> HashSet&lt;&gt;<span style="color: rgba(0, 0, 0, 1)">();
    </span><span style="color: rgba(0, 0, 255, 1)">set</span>.add(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">北京</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
    </span><span style="color: rgba(0, 0, 255, 1)">set</span>.add(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">上海</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
    springBootRedis.</span><span style="color: rgba(0, 0, 255, 1)">set</span>(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">set</span><span style="color: rgba(128, 0, 0, 1)">"</span>,<span style="color: rgba(0, 0, 255, 1)">set</span><span style="color: rgba(0, 0, 0, 1)">);
}

@RequestMapping(</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">/setMap</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">)
</span><span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">void</span><span style="color: rgba(0, 0, 0, 1)"> setMap(){
    Map map</span>=<span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> HashMap();
    map.put(</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">name</span><span style="color: rgba(128, 0, 0, 1)">"</span>,<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">北京</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
    map.put(</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">age</span><span style="color: rgba(128, 0, 0, 1)">"</span>,<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">111</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">);
    springBootRedis.</span><span style="color: rgba(0, 0, 255, 1)">set</span>(<span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(128, 0, 0, 1)">setMap</span><span style="color: rgba(128, 0, 0, 1)">"</span><span style="color: rgba(0, 0, 0, 1)">,map);
}



}

启动