Spring Data提供其他項(xiàng)目，用來幫你使用各種各樣的NoSQL技術(shù)，包括MongoDB, Neo4J, Elasticsearch, Solr, Redis,Gemfire, Couchbase和Cassandra。Spring Boot為Redis, MongoDB, Elasticsearch, Solr和Gemfire提供自動(dòng)配置。你可以充分利用其他項(xiàng)目，但你需要自己配置它們。
單個(gè) RedisTemplate 的配置
使用 spring-boot-starter-data-redis 配置一個(gè) redis 是很簡(jiǎn)單的。
pom.xml 中該引入的依賴是要引入的，下面的是完整的 pom.xml
<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>me.deweixu</groupId> <artifactId>muti-redis</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>muti-redis</name> <description>config mutiple redis host</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.4.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>
application.properties 文件增加相關(guān)的配置
spring.redis.host=localhostspring.redis.port=6379
簡(jiǎn)單的配置就是這樣的，還有一些有關(guān)連接池或其他的詳細(xì)配置可以在 common-application-properties 中參考，或者直接查看 RedisProperties 類。
這里使用 redis 的例子我就直接在主類中示例了。
package me.deweixu.mutiredis;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.CommandLineRunner;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.data.redis.core.BoundValueOperations;import org.springframework.data.redis.core.StringRedisTemplate;@SpringBootApplicationpublic class MutiRedisApplication implements CommandLineRunner { @Autowired StringRedisTemplate stringRedisTemplate; @Override public void run(String... args) throws Exception { BoundValueOperations op = stringRedisTemplate.boundValueOps("PERSON"); op.set("Deweixu"); } public static void main(String[] args) { SpringApplication.run(MutiRedisApplication.class, args); }}直接運(yùn)行起來，然后去 redis 查看結(jié)果：
$ redis-cli127.0.0.1:6379> keys *1) "PERSON"127.0.0.1:6379> get PERSON"Deweixu"127.0.0.1:6379>
沒問題的，順利的把數(shù)據(jù)存入到了 redis 中。
自定義 RedisTemplate 的序列類
上面的實(shí)現(xiàn)其實(shí)有一個(gè)問題，就是 redis 的 key 和 value 只能是 String 類型的，是 redis-starter 默認(rèn)實(shí)現(xiàn)了的一個(gè) StringRedisTemplate。查看其源代碼是這樣的
public StringRedisTemplate() { RedisSerializer<String> stringSerializer = new StringRedisSerializer(); this.setKeySerializer(stringSerializer); this.setValueSerializer(stringSerializer); this.setHashKeySerializer(stringSerializer); this.setHashValueSerializer(stringSerializer); } 如果使用 StringRedisTemplate 存入一個(gè)對(duì)象是要報(bào)錯(cuò)的，我們修改一下代碼試試：
@Autowired StringRedisTemplate stringRedisTemplate; @Override public void run(String... args) throws Exception { BoundValueOperations op = stringRedisTemplate.boundValueOps("PERSON"); op.set(new Person("Deiweixu", 22)); } public static void main(String[] args) { SpringApplication.run(MutiRedisApplication.class, args); }運(yùn)行就報(bào)錯(cuò)如下：
Caused by: java.lang.ClassCastException: me.deweixu.mutiredis.MutiRedisApplication$Person cannot be cast to java.base/java.lang.String
at org.springframework.data.redis.serializer.StringRedisSerializer.serialize(StringRedisSerializer.java:35) ~[spring-data-redis-2.0.9.RELEASE.jar:2.0.9.RELEASE]
at org.springframework.data.redis.core.AbstractOperations.rawValue(AbstractOperations.java:126) ~[spring-data-redis-2.0.9.RELEASE.jar:2.0.9.RELEASE]
at org.springframework.data.redis.core.DefaultValueOperations.set(DefaultValueOperations.java:197) ~[spring-data-redis-2.0.9.RELEASE.jar:2.0.9.RELEASE]
at org.springframework.data.redis.core.DefaultBoundValueOperations.set(DefaultBoundValueOperations.java:110) ~[spring-data-redis-2.0.9.RELEASE.jar:2.0.9.RELEASE]
at me.deweixu.mutiredis.MutiRedisApplication.run(MutiRedisApplication.java:19) [classes/:na]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:800) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
... 5 common frames omitted
這樣我們可以自己配置一下序列化類，這里我們把對(duì)象序列化為一個(gè) json 存入到 redis 中
@Bean JedisConnectionFactory jedisConnectionFactory() { return new JedisConnectionFactory(); } @Bean RedisTemplate<String, Object> firstRedisTemplate() { RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>(); ObjectMapper om = new ObjectMapper(); om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY); om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL); om.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false); GenericJackson2JsonRedisSerializer genericJackson2JsonRedisSerializer = new GenericJackson2JsonRedisSerializer(om); redisTemplate.setKeySerializer(new StringRedisSerializer()); redisTemplate.setValueSerializer(genericJackson2JsonRedisSerializer); redisTemplate.setHashKeySerializer(new StringRedisSerializer()); redisTemplate.setHashValueSerializer(genericJackson2JsonRedisSerializer); redisTemplate.setConnectionFactory(jedisConnectionFactory()); return redisTemplate; } @Autowired RedisTemplate<String, Object> redisTemplate; @Override public void run(String... args) throws Exception { BoundValueOperations<String, Object> op = redisTemplate.boundValueOps("PERSON"); People people = new People(); people.setAge(26); people.setName("Deweixu"); op.set(people); People getPeople = (People) op.get(); System.out.println(getPeople.getName() + "," + getPeople.getAge()); }上面使用了 Jedis 的配置和 GenericJackson2JsonRedisSerializer 類，所以 maven 要引入依賴
<dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.0</version></dependency><dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId></dependency>
這樣運(yùn)行可以看到 redis 中變成這樣了:
127.0.0.1:6379> get PERSON"[/"me.deweixu.mutiredis.entity.People/",{/"name/":/"Deweixu/",/"age/":26}]"127.0.0.1:6379>配置另外一個(gè) redisTemplate
@Bean RedisTemplate<String, Object> secondRedisTemplate() { RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>(); ObjectMapper om = new ObjectMapper(); om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY); om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL); om.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false); GenericJackson2JsonRedisSerializer genericJackson2JsonRedisSerializer = new GenericJackson2JsonRedisSerializer(om); redisTemplate.setKeySerializer(new StringRedisSerializer()); redisTemplate.setValueSerializer(genericJackson2JsonRedisSerializer); redisTemplate.setHashKeySerializer(new StringRedisSerializer()); redisTemplate.setHashValueSerializer(genericJackson2JsonRedisSerializer); // 這里的 redis 信息也是可以寫入配置文件，用 @Value 讀入 // 這里是單機(jī)的配置，看看源代碼還可以配置集群和哨兵模式 RedisStandaloneConfiguration configuration = new RedisStandaloneConfiguration("localhost", 6379); JedisConnectionFactory factory = new JedisConnectionFactory(configuration); redisTemplate.setConnectionFactory(factory); return redisTemplate; }注入 secondRedisTemplate 即可
@Autowired RedisTemplate<String, Object> firstRedisTemplate; @Autowired RedisTemplate<String, Object> secondRedisTemplate; @Override public void run(String... args) throws Exception { BoundValueOperations<String, Object> op = firstRedisTemplate.boundValueOps("PERSON"); People people = new People(); people.setAge(26); people.setName("Deweixu"); op.set(people); BoundValueOperations<String, Object> secondOp = secondRedisTemplate.boundValueOps("PERSON"); People getPeople = (People) secondOp.get(); System.out.println(getPeople.getName() + "," + getPeople.getAge()); }以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持VeVb武林網(wǎng)。
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