spring data提供其他项目,用来帮你使用各种各样的nosql技术,包括mongodb, neo4j, elasticsearch, solr, redis ,gemfire, couchbase和cassandra。spring boot为redis, mongodb, elasticsearch, solr和gemfire提供自动配置。你可以充分利用其他项目,但你需要自己配置它们。
单个 redistemplate 的配置
使用 spring-boot-starter-data-redis 配置一个 redis 是很简单的。
pom.xml 中该引入的依赖是要引入的,下面的是完整的 pom.xml
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<?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 文件增加相关的配置
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spring.redis.host=localhost spring.redis.port= 6379 |
简单的配置就是这样的,还有一些有关连接池或其他的详细配置可以在 common-application-properties 中参考,或者直接查看 redisproperties 类。
这里使用 redis 的例子我就直接在主类中示例了。
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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;
@springbootapplication public 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); } } |
直接运行起来,然后去 redis 查看结果:
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$ redis-cli 127.0 . 0.1 : 6379 > keys * 1 ) "person" 127.0 . 0.1 : 6379 > get person "deweixu" 127.0 . 0.1 : 6379 > |
没问题的,顺利的把数据存入到了 redis 中。
自定义 redistemplate 的序列类
上面的实现其实有一个问题,就是 redis 的 key 和 value 只能是 string 类型的,是 redis-starter 默认实现了的一个 stringredistemplate。查看其源代码是这样的
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public stringredistemplate() { redisserializer<string> stringserializer = new stringredisserializer(); this .setkeyserializer(stringserializer); this .setvalueserializer(stringserializer); this .sethashkeyserializer(stringserializer); this .sethashvalueserializer(stringserializer); } |
如果使用 stringredistemplate 存入一个对象是要报错的,我们修改一下代码试试:
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@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); } |
运行就报错如下:
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
这样我们可以自己配置一下序列化类,这里我们把对象序列化为一个 json 存入到 redis 中
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@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 类,所以 maven 要引入依赖
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<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> |
这样运行可以看到 redis 中变成这样了:
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127.0 . 0.1 : 6379 > get person "[\"me.deweixu.mutiredis.entity.people\",{\"name\":\"deweixu\",\"age\":26}]" 127.0 . 0.1 : 6379 > |
配置另外一个 redistemplate
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@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); // 这里的 redis 信息也是可以写入配置文件,用 @value 读入 // 这里是单机的配置,看看源代码还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
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@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内容,希望对大家的学习有所帮助,也希望大家多多支持。
原文链接:https://segmentfault.com/a/1190000016321700
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