从零搭建SpringBoot2.X整合Redis框架的详细教程
最近也不知道写啥,看之前写过kafka整合springboot的文章,大家反响还挺热烈的,嘿嘿嘿,就感觉帮助到大家了还挺好的,也算是达到了自己的目的,正好,今天业务模块是springboot整合redis,因为之前做过,所以有现成的代码,cv一下之后就可以了,所以时间比较多,那就给大家整理一下springboot整合redis的代码实现吧,从项目搭建到源码实现,下面全都有,耐心看完,相信会对你有所帮助的
好了,话不多说,我们开始吧,同样的,还是建议能够自己在自己的pc端实现一下
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一、使用spring initializr创建项目web项目
1、file→new→project
2、点击next如图所示,命名好group和artifact
3、next后如图所示,勾选中需要的依赖,spring initializr会自动导入所需的starter
4、创建项目成功后,pom.xml文件中的依赖如下
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelversion>4.0.0</modelversion> <parent> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-parent</artifactid> <version>2.2.2.release</version> <relativepath/> <!-- lookup parent from repository --> </parent> <groupid>com.heny</groupid> <artifactid>spring-boot-redis</artifactid> <version>0.0.1-snapshot</version> <name>spring-boot-redis</name> <description>demo project for spring boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-web</artifactid> </dependency> <dependency> <groupid>org.mybatis.spring.boot</groupid> <artifactid>mybatis-spring-boot-starter</artifactid> <version>2.1.1</version> </dependency> <dependency> <groupid>mysql</groupid> <artifactid>mysql-connector-java</artifactid> <scope>runtime</scope> </dependency> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-test</artifactid> <scope>test</scope> <exclusions> <exclusion> <groupid>org.junit.vintage</groupid> <artifactid>junit-vintage-engine</artifactid> </exclusion> </exclusions> </dependency> </dependencies> <build> <plugins> <plugin> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-maven-plugin</artifactid> </plugin> </plugins> </build> </project>
5、在pom.xml文件中添加redis的starter
<dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-data-redis</artifactid> </dependency>
6、创建javabean用于封装数据库数据,需要实现serializable
package com.henya.springboot.bean; import java.io.serializable; public class employee implements serializable{ private integer id; private string lastname; private string email; private integer gender; //性别 1男 0女 private integer did; public employee() { super(); } public employee(integer id, string lastname, string email, integer gender, integer did) { super(); this.id = id; this.lastname = lastname; this.email = email; this.gender = gender; this.did = did; } public integer getid() { return id; } public void setid(integer id) { this.id = id; } public string getlastname() { return lastname; } public void setlastname(string lastname) { this.lastname = lastname; } public string getemail() { return email; } public void setemail(string email) { this.email = email; } public integer getgender() { return gender; } public void setgender(integer gender) { this.gender = gender; } public integer getdid() { return did; } public void setdid(integer did) { this.did = did; } @override public string tostring() { return "employee [id=" + id + ", lastname=" + lastname + ", email=" + email + ", gender=" + gender + ", did=" + did + "]"; } }
注意:
在写javabean对象时需要实现serializable接口否则会报以下错误:
cannot deserialize; nested exception is org.springframework.core.serializer.support.serializationfailedexception
7、整合mybatis操作数据库,在application.properties配置文件中配置数据源信息
#servertimezone用于指定时区,不然会报错 spring.datasource.url=jdbc:mysql://localhost:3306/cache?servertimezone=utc spring.datasource.username=root spring.datasource.password=123456 # 开启驼峰命名法规则 mybatis.configuration.map-underscore-to-camel-case=true #日志级别 logging.level.com.henya.springboot.mapper=debug
8、使用注解版mybatis创建mapper
package com.henya.springboot.mapper; import com.henya.springboot.bean.employee; import org.apache.ibatis.annotations.*; @mapper public interface employeemapper { @select("select * from employee where id=#{id}") public employee getempbyid(integer id); @update("update employee set lastname=#{lastname},email=#{email},gender=#{gender},d_id=#{did} where id=#{id}") public void updateemp(employee employee); @delete("delete from emlpoyee where id=#{id}") public void delempbyid(integer id); @insert("insert into employee(lastname, email, gender, d_id) values (#{lastname}, #{email}, #{gender}, #{did})") public employee insertemp(employee employee); @select("select * from employee where lastname=#{lastname}") public employee getempbylastname(string lastname); }
注意:
需要使用使用@mapperscan注解扫描mapper所在的接口,只需要加在主程序类上即可。除此之外,还要使用@enablecaching用于开启缓存。
@mapperscan("com.henya.springboot.mapper") @springbootapplication @enablecaching //开启缓存 public class springbootredisapplication { public static void main(string[] args) { springapplication.run(springbootredisapplication.class, args); } }
9、编写service类,用于访问数据库或redis缓存
package com.henya.springboot.service; import com.henya.springboot.bean.employee; import com.henya.springboot.mapper.employeemapper; import org.springframework.beans.factory.annotation.autowired; import org.springframework.cache.annotation.*; import org.springframework.stereotype.service; @cacheconfig(cachenames = "emp") //抽取缓存的公共配置 @service public class employeeservice { @autowired employeemapper employeemapper; /** * @param id * @return */ @cacheable(cachenames = {"emp"},keygenerator = "mykeygenerator") public employee getempbyid(integer id) { system.err.println("开始查询"+ id +"号员工"); employee employee = employeemapper.getempbyid(id); return employee; } /** * @cacheput:既调用方法(这个方法必须要执行),又更新缓存数据 * @param employee * @return */ @cacheput(value = "emp",key = "#result.id") public employee updateemp(employee employee){ system.err.println("开始更新" + employee.getid() + "号员工"); employeemapper.updateemp(employee); return employee; } /** * @cacheevict:缓存清除 * @param id */ @cacheevict(value = "emp",beforeinvocation = true) public void deleteemp(integer id){ system.err.println("删除" + id + "员工"); int i = 10/0; }
10、编写controller类
package com.henya.springboot.controller; import com.henya.springboot.bean.employee; import com.henya.springboot.service.employeeservice; import org.springframework.beans.factory.annotation.autowired; import org.springframework.web.bind.annotation.getmapping; import org.springframework.web.bind.annotation.pathvariable; import org.springframework.web.bind.annotation.restcontroller; /** * @description: * @author:henya * @creattime:2019/12/1 12:44 */ @restcontroller public class employeecontroller { @autowired employeeservice employeeservice; @getmapping("/emp/{id}") public employee getempbyid(@pathvariable("id") integer id){ employee employee = employeeservice.getempbyid(id); return employee; } @getmapping("/emp") public employee updateemp(employee employee){ employee emp = employeeservice.updateemp(employee); return emp; } }
二、测试springboot整合redis是否成功
1、在浏览器访问,也可以使用测试类,笔者使用了浏览器访问http://localhost:8080/emp/1进行测试,初次访问时,控制台会提示开始查询1号员工,如图所示。
2、再次访问时,控制台并没有sql日志,如图所示。
3、此时使用redisdesktopmanager工具查看redis时有数据,并且cachename为emp,如图所示
只是emp对象被序列化了。查看源码可知redis默认使用jdk进行序列化。
static redisserializer<object> java(@nullable classloader classloader) { return new jdkserializationredisserializer(classloader); }
查看redisserializer接口的实现有以下几种:
我们常用的就是以json的格式进行序列化。但是需要自定义rediscachemanager。
三、自定义rediscachemanager
package com.henya.springboot.config; import org.springframework.context.annotation.bean; import org.springframework.context.annotation.configuration; import org.springframework.data.redis.cache.rediscacheconfiguration; import org.springframework.data.redis.cache.rediscachemanager; import org.springframework.data.redis.cache.rediscachewriter; import org.springframework.data.redis.connection.redisconnectionfactory; import org.springframework.data.redis.serializer.genericjackson2jsonredisserializer; import org.springframework.data.redis.serializer.redisserializationcontext; import org.springframework.data.redis.serializer.redisserializer; /** * @description: * @author:henya * @creattime:2019/12/6 20:50 */ @configuration public class myredisconfig { @bean public rediscachemanager empcachemanager(redisconnectionfactory redisconnectionfactory){ //rediscachemanager rediscachemanager = new rediscachemanager(redisconnectionfactory); rediscachewriter rediscachewriter = rediscachewriter.nonlockingrediscachewriter(redisconnectionfactory); redisserializer<object> redisserializer = new genericjackson2jsonredisserializer(); redisserializationcontext.serializationpair<object> pair = redisserializationcontext.serializationpair.fromserializer(redisserializer); rediscacheconfiguration rediscacheconfiguration = rediscacheconfiguration.defaultcacheconfig().serializevalueswith(pair); // 默认会将cachename作为key的前缀 return new rediscachemanager(rediscachewriter, rediscacheconfiguration); } }
此时,redis中缓存数据就以json的格式进行序列化,如图所示。
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