每次写完程序后都需要重启服务器,需要大量的时间,spring boot提供了一款工具devtools
帮助实现热部署。
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> <!-- 可选 --> </dependency>
导入插件的以来后每次点击 ---->构建------>构建项目就可以了,相比重启要快的多。
spring boot整合redis最常用的有三个工具库Jedis,Redisson,Lettuce
。
共同点:都提供了基于 Redis 操作的 Java API,只是封装程度,具体实现稍有不同。
不同点:
Jedis是 Redis 的 Java 实现的客户端。支持基本的数据类型如:String、Hash、List、Set、Sorted Set。
特点:使用阻塞的 I/O,方法调用同步,程序流需要等到 socket 处理完 I/O 才能执行,不支持异步操作。Jedis 客户端实例不是线程安全的,需要通过连接池来使用 Jedis。
Redisson
优点点:分布式锁,分布式集合,可通过 Redis 支持延迟队列。
Lettuce
用于线程安全同步,异步和响应使用,支持集群,Sentinel,管道和编码器。
基于 Netty 框架的事件驱动的通信层,其方法调用是异步的。Lettuce 的 API 是线程安全的,所以可以操作单个 Lettuce 连接来完成各种操作。
引入依赖
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency> <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>3.1.0</version> </dependency>
配置文件
# Redis服务器地址 spring.data.redis.host=192.168.223.128 # Redis服务器连接端口 spring.data.redis.port=6379 # Redis服务器连接密码(默认为空) spring.data.redis.password=root
注意时spring.data.redis而不是spring.redis后者已经舍弃了。
通过jedis连接redis:
import redis.clients.jedis.Jedis; public class RedisConect { public static void main(String[] args) { Jedis jedis = new Jedis("192.168.223.128",6379); //配置连接密码 jedis.auth("root"); String csvfile = jedis.get("csvfile"); System.out.println(csvfile); jedis.close(); } }
spring boot 联合jedis连接redis:
//装配参数 import lombok.Data; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.stereotype.Component; @Component @ConfigurationProperties(prefix = "spring.data.redis") @Data public class RedisConfig { private String host; private int port; private String password; } //创建jedis import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import redis.clients.jedis.Jedis; @Service public class JedisService { @Autowired RedisConfig redisConfig; public Jedis defaultJedis(){ Jedis jedis = new Jedis(redisConfig.getHost(),redisConfig.getPort()); jedis.auth(redisConfig.getPassword()); return jedis; } } //测试 @Test void One(){ jedisService.defaultJedis().set("one","word"); String one = jedisService.defaultJedis().get("one"); System.out.println(one); }
装配参数除了上面@ConfigurationProperties
的方法还有PropertySource
方法:
@Configuration @PropertySource("classpath:redis.properties") public class RedisConfig { @Value("${redis.hostName}") private String hostName; @Value("${redis.password}") private String password; @Value("${redis.port}") }
RedisTemplate是spring自带模板,需要配置一些参数:
package com.example.JedsFactory; import com.example.RedisConfig.RedisConfig; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.PropertySource; import org.springframework.data.redis.connection.RedisConnectionFactory; import org.springframework.data.redis.connection.RedisStandaloneConfiguration; import org.springframework.data.redis.connection.jedis.JedisClientConfiguration; import org.springframework.data.redis.connection.jedis.JedisConnectionFactory; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer; import org.springframework.data.redis.serializer.StringRedisSerializer; import org.springframework.stereotype.Component; @Configuration @PropertySource("classpath:redis.properties") public class JedisFactory { @Value("${spring.data.redis.host}") private String host; @Value("${spring.data.redis.password}") private String password; @Value("${spring.data.redis.port}") private Integer port; @Bean public JedisConnectionFactory JedisConnectionFactory(){ RedisStandaloneConfiguration redisStandaloneConfiguration = new RedisStandaloneConfiguration (); redisStandaloneConfiguration.setHostName(host); redisStandaloneConfiguration.setPort(port); redisStandaloneConfiguration.setPassword(password); JedisClientConfiguration.JedisClientConfigurationBuilder jedisClientConfiguration = JedisClientConfiguration.builder(); JedisConnectionFactory factory = new JedisConnectionFactory(redisStandaloneConfiguration, jedisClientConfiguration.build()); return factory; } @Bean public RedisTemplate makeRedisTemplate(RedisConnectionFactory redisConnectionFactory) { RedisTemplate redisTemplate = new RedisTemplate(); redisTemplate.setConnectionFactory(redisConnectionFactory); return redisTemplate; } }
//redis.properties # Redis服务器地址 spring.data.redis.host=192.168.223.128 # Redis服务器连接端口 spring.data.redis.port=6379 # Redis服务器连接密码(默认为空) spring.data.redis.password=root
测试:
@Test void two(){ redisTemplate.opsForValue().set("two","hello"); String two =(String) redisTemplate.opsForValue().get("two"); System.out.println(two); }
Caused by: java.lang.NoClassDefFoundError: redis/clients/util/Pool
如果报错了,如标题的错误说明jedis版本高了,有冲突,降低jedis版本即可。
jedis从3.0.1版本降低到2.9.1版本。
Caused by: java.lang.NumberFormatException: For input string: “port”
Caused by: org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'int'; nested exception is java.lang.NumberFormatException: For input string: "port" at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:79) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1339) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1311) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.3.24.jar:5.3.24] ... 88 common frames omitted Caused by: java.lang.NumberFormatException: For input string: "port" at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) ~[na:1.8.0_181] at java.lang.Integer.parseInt(Integer.java:580) ~[na:1.8.0_181] at java.lang.Integer.valueOf(Integer.java:766) ~[na:1.8.0_181] at org.springframework.util.NumberUtils.parseNumber(NumberUtils.java:211) ~[spring-core-5.3.24.jar:5.3.24] at org.springframework.beans.propertyeditors.CustomNumberEditor.setAsText(CustomNumberEditor.java:115) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.TypeConverterDelegate.doConvertTextValue(TypeConverterDelegate.java:429) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.TypeConverterDelegate.doConvertValue(TypeConverterDelegate.java:402) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:155) ~[spring-beans-5.3.24.jar:5.3.24]
连接redis时出现这个错误原因是:
port属性不能用int接收,改为Integer。
Caused by: java.lang.NumberFormatException: For input string: “port“
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