2.22. Spring boot with Cache-白红宇

2.22.1. Spring boot with Redis

2.22.1.1. maven


          
       
        org.springframework.boot
           
       
        spring-boot-starter-data-redis

2.22.1.2. application.properties

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

ListOperations

public class Example {    // inject the actual template    @Autowired    private RedisTemplate
      
        template;    // inject the template as ListOperations    // can also inject as Value, Set, ZSet, and HashOperations    @Resource(name="redisTemplate")    private ListOperations
       
         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
        
          redisTemplate;		public List
         
           getProtocol() {		List
          
            protocols = new ArrayList
           
            ();		Gson gson = new Gson();		Type type = new TypeToken
            
             
              >(){}.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


      			
       
        org.springframework.boot
       			
       
        spring-boot-starter-cache

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

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