SpringBoot中使用redis缓存

上篇文章：SpringBoot之连接数据库

上篇文章介绍了如何在Springboot项目中快速的配置数据库连接的信息。本文将介绍Springboot中如何使用redis缓存以及相关的配置。

前提：redis已经在本地安装且正确部署了,并运行了redis-server,如下图所示。

如果没有安装redis，可以参照redis下载官网，根据相应的步骤，进行配置和运行。

 

一、添加依赖

将以下依赖放入到pom.xml中，

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-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-redis</artifactId>
   <version>1.3.8.RELEASE</version>
</dependency>

二、添加配置

在application.properties添加如下配置。

#host
redis.hostname=127.0.0.1
#redis端口号  默认6379
redis.port=6379
redis.database=0
redis.pool.maxActive=600
redis.pool.maxIdle=300
redis.pool.maxWait=3000
redis.pool.testOnBorrow=true

三、代码实现redis工具类

先写一个处理redis工具类和注入redis的配置信息的类。

RedisConfig.java

该类是用来读取application.properties的Configuration类，加载redis配置信息。

@Configuration
@EnableAutoConfiguration
public class RedisConfig {

    @Bean
    @ConfigurationProperties(prefix = "spring.redis.pool")
    public JedisPoolConfig getRedisConfig(){
        JedisPoolConfig config = new JedisPoolConfig();
        return config;
    }

    @Bean
    @ConfigurationProperties(prefix = "spring.redis")
    public JedisConnectionFactory getConnectionFactory() {
        JedisConnectionFactory factory = new JedisConnectionFactory();
        factory.setUsePool(true);
        JedisPoolConfig config = getRedisConfig();
        factory.setPoolConfig(config);
        return factory;
    }

    @Bean
    public RedisTemplate<?, ?> getRedisTemplate() {
        JedisConnectionFactory factory = getConnectionFactory();
        RedisTemplate<?, ?> template = new StringRedisTemplate(factory);
        return template;
    }

}

RedisService.java

redis服务接口

public interface RedisService {

    boolean set(String key, String value);

    String get(String key);

    boolean expire(String key, long expire);

    boolean remove(String key);

}

RedisServiceImpl.java

该类实现接口来操作redis.该类比较简单，只适合插入String类型的数据，查询一样。

@Service("redisService")
public class RedisServiceImpl implements RedisService {

    @Resource
    private RedisTemplate<String, Object> redisTemplate;

    @Override
    public boolean set(final String key, final String value) {
        boolean result = redisTemplate.execute(new RedisCallback<Boolean>() {
            @Override
            public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
                RedisSerializer<String> serializer = redisTemplate.getStringSerializer();
                connection.set(serializer.serialize(key), serializer.serialize(value));
                return true;
            }
        });

        return result;
    }

    @Override
    public String get(final String key) {
        String result = redisTemplate.execute(new RedisCallback<String>() {
            @Override
            public String doInRedis(RedisConnection connection) throws DataAccessException {
                RedisSerializer<String> serializer = redisTemplate.getStringSerializer();
                byte[] value = connection.get(serializer.serialize(key));
                return serializer.deserialize(value);
            }
        });
        return result;
    }

    @Override
    public boolean expire(final String key, long expire) {
        return redisTemplate.expire(key, expire, TimeUnit.SECONDS);
    }

    @Override
    public boolean remove(final String key) {
        boolean result = redisTemplate.execute(new RedisCallback<Boolean>() {
            @Override
            public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
                RedisSerializer<String> serializer = redisTemplate.getStringSerializer();
                connection.del(key.getBytes());
                return true;
            }
        });
        return result;
    }
}

四、验证redis是否配置成功

写一个RedisController类，用来调用redis。

@RestController
@RequestMapping("/redis")
public class RedisController {

    @Autowired
    private RedisService redisService;


    @RequestMapping(value = "/hello")
    public String hello() {
        return "hello";
    }

    @RequestMapping(method = RequestMethod.GET, value = "/save")
    public String save(@RequestParam("key") String key, @RequestParam("value") String value) {
        if (redisService.set(key, value)) {
            return "success";
        }
        return "failed";
    }


    @RequestMapping(method = RequestMethod.GET, value = "/get")
    public String get(@RequestParam("key") String key) {
        return redisService.get(key);
    }
}

好了，下面运行下，然后输入

运行成功。好了redis的简单使用就到这里了。