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知乎专栏多维度架构

5.20. Spring boot with Redis

5.20.1. Spring boot with Redis

5.20.1.1. maven

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

5.20.1.2. 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
				
				

5.20.1.3. 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"));
    }
}				
				
				

5.20.1.4. 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 5.3. 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;
	}
					
					

5.20.2. Redis Pub/Sub

5.20.2.1. Redis配置类

				
package cn.netkiller.wallet.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.listener.ChannelTopic;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;

import cn.netkiller.wallet.redis.RedisMessageSubscriber;

@Configuration
public class RedisConfig {

	public RedisConfig() {
	}

	@Bean
	public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory connectionFactory) {
		StringRedisTemplate redisTemplate = new StringRedisTemplate();
		redisTemplate.setConnectionFactory(connectionFactory);
		return redisTemplate;
	}

	@Bean
	public MessageListenerAdapter messageListener() {
		return new MessageListenerAdapter(new RedisMessageSubscriber());
	}

	@Bean
	public ChannelTopic topic() {
		return new ChannelTopic("demo");
	}

	@Bean
	public RedisMessageListenerContainer redisContainer(RedisConnectionFactory connectionFactory, MessageListenerAdapter messageListener) {
		RedisMessageListenerContainer container = new RedisMessageListenerContainer();

		container.setConnectionFactory(connectionFactory);
		container.addMessageListener(messageListener(), topic());
		container.addMessageListener(messageListener(), new ChannelTopic("test"));
		return container;
	}

}

				
				

5.20.2.2. 订阅和发布类

				
package cn.netkiller.wallet.redis;

import java.nio.charset.StandardCharsets;

import org.springframework.data.redis.connection.Message;
import org.springframework.data.redis.connection.MessageListener;

public class RedisMessageSubscriber implements MessageListener {
	public void onMessage(final Message message, final byte[] pattern) {
		System.out.println("Topic : " + new String(message.getChannel(), StandardCharsets.UTF_8));
		System.out.println("Message : " + message.toString());
	}
}

				
				
				
package cn.netkiller.wallet.redis;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.listener.ChannelTopic;

public class RedisMessagePublisher {

	private final StringRedisTemplate redisTemplate;

	private final ChannelTopic topic;

	public RedisMessagePublisher(StringRedisTemplate redisTemplate, ChannelTopic topic) {
		this.redisTemplate = redisTemplate;
		this.topic = topic;
	}

	public void publish(String message) {
		redisTemplate.convertAndSend(topic.getTopic(), message);
	}
}
								
				
				

5.20.2.3. 消息发布演示

				
	@Autowired
	private StringRedisTemplate stringRedisTemplate;
	
	@GetMapping("/pub/demo")
	public String pub() {

		RedisMessagePublisher publisher = new RedisMessagePublisher(stringRedisTemplate, new ChannelTopic("demo"));
		String message = "Message " + UUID.randomUUID();
		publisher.publish(message);
		return message;
	}

	@GetMapping("/pub/test")
	public String pub(@RequestParam String message) {

		RedisMessagePublisher publisher = new RedisMessagePublisher(stringRedisTemplate, new ChannelTopic("test"));
		publisher.publish(message);
		return message;
	}