2.22. Spring boot with Cache

最新推荐文章于 2025-08-10 13:24:43 发布

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最新推荐文章于 2025-08-10 13:24:43 发布

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文章标签：数据库 java

原文链接：https://yq.aliyun.com/articles/319582

本文介绍如何在Spring Boot项目中整合Redis，包括配置Maven依赖、设置application.properties、使用StringRedisTemplate进行数据读写操作、通过RedisTemplate实现复杂类型序列化，以及利用@Cacheable注解实现缓存。

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2.22.1. Spring boot with Redis

2.22.1.1. maven

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

2.22.1.2. application.properties

				
spring.redis.database=10
spring.redis.host=localhost
spring.redis.port=6379
spring.redis.password=
spring.redis.pool.max-active=8
spring.redis.pool.max-wait=-1
spring.redis.pool.max-idle=8
spring.redis.pool.min-idle=0
spring.redis.timeout=0

2.22.1.3. JUnit

				
@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(Application.class)
public class ApplicationTests {
	@Autowired
	private StringRedisTemplate stringRedisTemplate;
	@Test
	public void test() throws Exception {
		// 保存字符串
		stringRedisTemplate.opsForValue().set("neo", "chen");
		Assert.assertEquals("chen", stringRedisTemplate.opsForValue().get("neo"));
    }
}

2.22.1.4. Controller

stringRedisTemplate模板用于存储key,value为字符串的数据

				
	@Autowired
	private StringRedisTemplate stringRedisTemplate;
	
	@RequestMapping("/test")
	@ResponseBody
	public String test() {
		String message = "";
		stringRedisTemplate.opsForValue().set("hello", "world");
		message = stringRedisTemplate.opsForValue().get("hello");
		return message;
	}

等同于

				
	@Autowired
	private RedisTemplate<String, String> redisTemplate;

ListOperations

				
public class Example {

    // inject the actual template
    @Autowired
    private RedisTemplate<String, String> template;

    // inject the template as ListOperations
    // can also inject as Value, Set, ZSet, and HashOperations
    @Resource(name="redisTemplate")
    private ListOperations<String, String> listOps;

    public void addLink(String userId, URL url) {
        listOps.leftPush(userId, url.toExternalForm());
        // or use template directly
        redisTemplate.boundListOps(userId).leftPush(url.toExternalForm());
    }
}

例 2.4. RedisTemplate

					
	@Autowired
	private RedisTemplate<String, String> redisTemplate;
	
	public List<Protocol> getProtocol() {
		List<Protocol> protocols = new ArrayList<Protocol>();
		Gson gson = new Gson();
		Type type = new TypeToken<List<Protocol>>(){}.getType();
		redisTemplate.setKeySerializer(new StringRedisSerializer());
		redisTemplate.setValueSerializer(new StringRedisSerializer());
		
		String cacheKey = String.format("%s:%s", this.getClass().getName(), Thread.currentThread().getStackTrace()[1].getMethodName());
		long expireTime = 5;
		
		if(redisTemplate.hasKey(cacheKey)){
			String cacheValue = redisTemplate.opsForValue().get(cacheKey);
			System.out.println(cacheValue);
			protocols = gson.fromJson(cacheValue, type);
		}else{
			Protocol protocol = new Protocol();
			protocol.setRequest(new Date().toString());
			protocols.add(protocol);
			
			String jsonString = gson.toJson(protocols, type);
	        System.out.println( jsonString );
			
			redisTemplate.opsForValue().set(cacheKey, jsonString);
			redisTemplate.expire(cacheKey, expireTime, TimeUnit.SECONDS);
		}
		return protocols;
	}

2.22.2. @Cacheable

2.22.2.1. maven

				
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-cache</artifactId>
		</dependency>

2.22.2.2. Controller

缓存返回结果

				
	@Cacheable("cacheable")
	@RequestMapping("/test/cacheable")
	@ResponseBody
	public String cacheable() {
		Date date = new Date();
		String message = date.toString();
		return message;
	}

5秒钟清楚一次缓存

				
	@Scheduled(fixedDelay = 5000)
	@CacheEvict(allEntries = true, value = "cacheable")	
	public void expire() {
		Date date = new Date();
		String message = date.toString();
		System.out.println(message);
	}

原文出处：Netkiller 系列手札
本文作者：陈景峯
转载请与作者联系，同时请务必标明文章原始出处和作者信息及本声明。