SpringBoot整合RedisTemplate实现缓存信息监控的步骤

SpringBoot 整合 Redis 数据库实现数据缓存的本质是整合 Redis 数据库，通过对需要“缓存”的数据存入 Redis 数据库中，下次使用时先从 Redis 中获取，Redis 中没有再从数据库中获取，这样就实现了 Redis 做数据缓存。   

按照惯例，下面一步一步的实现 Springboot 整合 Redis 来存储数据，读取数据。

1.项目添加依赖首页第一步还是在项目添加 Redis 的环境， Jedis。

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

2. 添加redis的参数

spring:
### Redis Configuration
  redis:
    pool:
      max-idle: 10
      min-idle: 5
      max-total: 20
    hostName: 127.0.0.1
    port: 6379

3.编写一个 RedisConfig 注册到 Spring 容器

package com.config;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import redis.clients.jedis.JedisPoolConfig;
/**
 * 描述：Redis 配置类
 */
@Configuration
public class RedisConfig {
	/**
	 * 1.创建 JedisPoolConfig 对象。在该对象中完成一些连接池的配置
	 */
	@Bean
	@ConfigurationProperties(prefix="spring.redis.pool")
	public JedisPoolConfig jedisPoolConfig() {
		JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();

		return jedisPoolConfig;
	}
	/**
	 * 2.创建 JedisConnectionFactory：配置 redis 连接信息
	 */
	@Bean
	@ConfigurationProperties(prefix="spring.redis")
	public JedisConnectionFactory jedisConnectionFactory(JedisPoolConfig jedisPoolConfig) {

		JedisConnectionFactory jedisConnectionFactory = new JedisConnectionFactory(jedisPoolConfig);

		return jedisConnectionFactory;
	}
	/**
	 * 3.创建 RedisTemplate:用于执行 Redis 操作的方法
	 */
	@Bean
	public RedisTemplate<String, Object> redisTemplate(JedisConnectionFactory jedisConnectionFactory) {

		RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();

		// 关联
		redisTemplate.setConnectionFactory(jedisConnectionFactory);
		// 为 key 设置序列化器
		redisTemplate.setKeySerializer(new StringRedisSerializer());
		// 为 value 设置序列化器
		redisTemplate.setValueSerializer(new StringRedisSerializer());

		return redisTemplate;
	}
}

4.使用redisTemplate

package com.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.JdkSerializationRedisSerializer;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.bean.Users;
/**
* @Description 整合 Redis 测试Controller
* @version V1.0
*/
@RestController
public class RedisController {

	@Autowired
	private RedisTemplate<String, Object> redisTemplate;

	@RequestMapping("/redishandle")
	public String redishandle() {

		//添加字符串
		redisTemplate.opsForValue().set("author", "欧阳");

		//获取字符串
		String value = (String)redisTemplate.opsForValue().get("author");
		System.out.println("author = " + value);

		//添加对象
		//重新设置序列化器
		redisTemplate.setValueSerializer(new JdkSerializationRedisSerializer());
		redisTemplate.opsForValue().set("users", new Users("1" , "张三"));

		//获取对象
		//重新设置序列化器
		redisTemplate.setValueSerializer(new JdkSerializationRedisSerializer());
		Users user = (Users)redisTemplate.opsForValue().get("users");
		System.out.println(user);

		//以json格式存储对象
		//重新设置序列化器
		redisTemplate.setValueSerializer(new Jackson2JsonRedisSerializer<>(Users.class));
		redisTemplate.opsForValue().set("usersJson", new Users("2" , "李四"));

		//以json格式获取对象
		//重新设置序列化器
		redisTemplate.setValueSerializer(new Jackson2JsonRedisSerializer<>(Users.class));
		user = (Users)redisTemplate.opsForValue().get("usersJson");
		System.out.println(user);

		return "home";
	}
}

5.项目实战中redisTemplate的使用

/**
 *
 */
package com.shiwen.lujing.service.impl;
import java.util.List;
import java.util.concurrent.TimeUnit;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Service;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.shiwen.lujing.dao.mapper.WellAreaDao;
import com.shiwen.lujing.service.WellAreaService;
import com.shiwen.lujing.util.RedisConstants;
/**
 * @author zhangkai
 *
 */
@Service
public class WellAreaServiceImpl implements WellAreaService {
	@Autowired
	private WellAreaDao wellAreaDao;
	@Autowired
	private RedisTemplate<String, String> stringRedisTemplate;
	/*
	 * (non-Javadoc)
	 *
	 * @see com.shiwen.lujing.service.WellAreaService#getAll()
	 */
	@Override
	public String getAll() throws JsonProcessingException {
		//redis中key是字符串
		ValueOperations<String, String> opsForValue = stringRedisTemplate.opsForValue();
		//通过key获取redis中的数据
		String wellArea = opsForValue.get(RedisConstants.REDIS_KEY_WELL_AREA);
		//如果没有去查数据库
		if (wellArea == null) {
			List<String> wellAreaList = wellAreaDao.getAll();
			wellArea = new ObjectMapper().writeValueAsString(wellAreaList);
			//将查出来的数据存储在redis中
			opsForValue.set(RedisConstants.REDIS_KEY_WELL_AREA, wellArea, RedisConstants.REDIS_TIMEOUT_1, TimeUnit.DAYS);
            // set(K key, V value, long timeout, TimeUnit unit)
            //timeout:过期时间；  unit:时间单位
            //使用：redisTemplate.opsForValue().set("name","tom",10, TimeUnit.SECONDS);
            //redisTemplate.opsForValue().get("name")由于设置的是10秒失效，十秒之内查询有结
            //果，十秒之后返回为null
		}
		return wellArea;
	}
}

6.redis中使用的key

package com.shiwen.lujing.util;
/**
 * redis 相关常量
 *
 *
 */
public interface RedisConstants {
	/**
	 * 井首字
	 */
	String REDIS_KEY_JING_SHOU_ZI = "JING-SHOU-ZI";
	/**
	 * 井区块
	 */
	String REDIS_KEY_WELL_AREA = "WELL-AREA";
	/**
	 *
	 */
	long REDIS_TIMEOUT_1 = 1L;
}

补充：SpringBoot整合RedisTemplate实现缓存信息监控

1、CacheController接口代码

@RestController
@RequestMapping("/monitor/cache")
public class CacheController
{
    @Autowired
    private RedisTemplate<String, String> redisTemplate;
 
    @PreAuthorize("@ss.hasPermi('monitor:cache:list')")// 自定义权限注解
    @GetMapping()
    public AjaxResult getInfo() throws Exception
    {
        // 获取redis缓存完整信息
        //Properties info = redisTemplate.getRequiredConnectionFactory().getConnection().info();
        Properties info = (Properties) redisTemplate.execute((RedisCallback<Object>) connection -> connection.info());
        // 获取redis缓存命令统计信息
        //Properties commandStats = redisTemplate.getRequiredConnectionFactory().getConnection().info("commandstats");
        Properties commandStats = (Properties) redisTemplate.execute((RedisCallback<Object>) connection -> connection.info("commandstats"));
        // 获取redis缓存中可用键Key的总数
        //Long dbSize = redisTemplate.getRequiredConnectionFactory().getConnection().dbSize();
        Object dbSize = redisTemplate.execute((RedisCallback<Object>) connection -> connection.dbSize());
        Map<String, Object> result = new HashMap<>(3);
        result.put("info", info);
        result.put("dbSize", dbSize);
        List<Map<String, String>> pieList = new ArrayList<>();
        commandStats.stringPropertyNames().forEach(key -> {
            Map<String, String> data = new HashMap<>(2);
            String property = commandStats.getProperty(key);
            data.put("name", StringUtils.removeStart(key, "cmdstat_"));
            data.put("value", StringUtils.substringBetween(property, "calls=", ",usec"));
            pieList.add(data);
        });
        result.put("commandStats", pieList);
        return AjaxResult.success(result);
    }
}

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