导读
Redis不了解的小伙伴,先去脑补下Redis从入门到精通,点我直达。在看下面的东西哟~
创建SpringBoot项目
在线创建方式
网址:https://start.spring.io/
然后创建Controller、Mapper、Service包
SpringBoot整合Redis
引入Redis依赖
org.springframework.boot spring-boot-starter-data-redis
完整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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0modelVersion> <parent> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-parentartifactId> <version>2.3.3.RELEASEversion> <relativePath/> parent> <groupId>com.cybgroupId> <artifactId>chenyb-mobile-redisartifactId> <version>0.0.1-SNAPSHOTversion> <name>chenyb-mobile-redisname> <description>Demo project for Spring Bootdescription> <properties> <java.version>1.8java.version> properties> <dependencies> <dependency> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-webartifactId> dependency> <dependency> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-testartifactId> <scope>testscope> <exclusions> <exclusion> <groupId>org.junit.vintagegroupId> <artifactId>junit-vintage-engineartifactId> exclusion> exclusions> dependency> <dependency> <groupId>io.projectreactorgroupId> <artifactId>reactor-testartifactId> <scope>testscope> dependency> <dependency> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-data-redisartifactId> dependency> dependencies> <build> <plugins> <plugin> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-maven-pluginartifactId> plugin> plugins> build> project>
设置Redis的Template
RedisConfig.java
package com.cyb.mobile.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.RedisTemplate; import org.springframework.data.redis.serializer.RedisSerializer; import org.springframework.data.redis.serializer.StringRedisSerializer; /** * @ClassName:RedisConfig * @Description:Redis配置类 * @Author:chenyb * @Date:2020/8/16 11:48 下午 * @Versiion:1.0 */ @Configuration //当前类为配置类 public class RedisConfig { @Bean //redisTemplate注入到Spring容器 public RedisTemplateredisTemplate(RedisConnectionFactory factory){ RedisTemplate redisTemplate=new RedisTemplate<>(); RedisSerializer redisSerializer = new StringRedisSerializer(); redisTemplate.setConnectionFactory(factory); //key序列化 redisTemplate.setKeySerializer(redisSerializer); //value序列化 redisTemplate.setValueSerializer(redisSerializer); //value hashmap序列化 redisTemplate.setHashKeySerializer(redisSerializer); //key hashmap序列化 redisTemplate.setHashValueSerializer(redisSerializer); return redisTemplate; } }
设置Redis连接信息
# 连接的那个数据库
spring.redis.database=0
# redis服务的ip地址
spring.redis.host=192.168.199.142
# redis端口号
spring.redis.port=6379
# redis的密码,没设置过密码,可为空
spring.redis.password=12345678
Redis工具类
redisTemplate API
- opsForValue ==》String
- opsForSet ==》Set
- opsForHash ==》hash
- opsForZset ==》SortSet
- opsForList ==》list队列
RedisUtils.java
package com.cyb.mobile.utils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.redis.core.*; import org.springframework.stereotype.Service; import java.io.Serializable; import java.util.List; import java.util.Set; import java.util.concurrent.TimeUnit; /** * @ClassName:RedisUtils * @Description:Redis工具类 * @Author:chenyb * @Date:2020/8/17 12:05 上午 * @Versiion:1.0 */ @Service public class RedisUtils { @Autowired private RedisTemplate redisTemplate; private static double size = Math.pow(2, 32); /** * 写入缓存 * * @param key * @param offset 位 8Bit=1Byte * @return */ public boolean setBit(String key, long offset, boolean isShow) { boolean result = false; try { ValueOperationsoperations = redisTemplate.opsForValue(); operations.setBit(key, offset, isShow); result = true; } catch (Exception e) { e.printStackTrace(); } return result; } /** * 写入缓存 * * @param key * @param offset * @return */ public boolean getBit(String key, long offset) { boolean result = false; try { ValueOperations operations = redisTemplate.opsForValue(); result = operations.getBit(key, offset); } catch (Exception e) { e.printStackTrace(); } return result; } /** * 写入缓存 * * @param key * @param value * @return */ public boolean set(final String key, Object value) { boolean result = false; try { ValueOperations operations = redisTemplate.opsForValue(); operations.set(key, value); result = true; } catch (Exception e) { e.printStackTrace(); } return result; } /** * 写入缓存设置时效时间 * * @param key * @param value * @return */ public boolean set(final String key, Object value, Long expireTime) { boolean result = false; try { ValueOperations operations = redisTemplate.opsForValue(); operations.set(key, value); redisTemplate.expire(key, expireTime, TimeUnit.SECONDS); result = true; } catch (Exception e) { e.printStackTrace(); } return result; } /** * 批量删除对应的value * * @param keys */ public void remove(final String... keys) { for (String key : keys) { remove(key); } } /** * 删除对应的value * * @param key */ public void remove(final String key) { if (exists(key)) { redisTemplate.delete(key); } } /** * 判断缓存中是否有对应的value * * @param key * @return */ public boolean exists(final String key) { return redisTemplate.hasKey(key); } /** * 读取缓存 * * @param key * @return */ public Object get(final String key) { Object result = null; ValueOperations operations = redisTemplate.opsForValue(); result = operations.get(key); return result; } /** * 哈希 添加 * * @param key * @param hashKey * @param value */ public void hmSet(String key, Object hashKey, Object value) { HashOperations hash = redisTemplate.opsForHash(); hash.put(key, hashKey, value); } /** * 哈希获取数据 * * @param key * @param hashKey * @return */ public Object hmGet(String key, Object hashKey) { HashOperations hash = redisTemplate.opsForHash(); return hash.get(key, hashKey); } /** * 列表添加 * * @param k * @param v */ public void lPush(String k, Object v) { ListOperations list = redisTemplate.opsForList(); list.rightPush(k, v); } /** * 列表获取 * * @param k * @param l * @param l1 * @return */ public List
控制层
RedisController.java
package com.cyb.mobile.controller; import com.cyb.mobile.utils.RedisUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * @ClassName:TestController * @Description:Redis控制器 * @Author:chenyb * @Date:2020/8/17 12:07 上午 * @Versiion:1.0 */ @RestController public class RedisController { @Autowired private RedisUtils redisUtils; @RequestMapping("setAndGet") public String test(String k,String v){ redisUtils.set(k,v); return (String) redisUtils.get(k); } }
测试
SpringBoot整合Mybatis
添加依赖
<dependency> <groupId>org.mybatis.spring.bootgroupId> <artifactId>mybatis-spring-boot-starterartifactId> <version>2.1.3version> dependency> <dependency> <groupId>mysqlgroupId> <artifactId>mysql-connector-javaartifactId> dependency> <dependency> <groupId>com.alibabagroupId> <artifactId>druidartifactId> <version>1.1.23version> dependency>
完整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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0modelVersion> <parent> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-parentartifactId> <version>2.3.3.RELEASEversion> <relativePath/> parent> <groupId>com.cybgroupId> <artifactId>chenyb-mobile-redisartifactId> <version>0.0.1-SNAPSHOTversion> <name>chenyb-mobile-redisname> <description>Demo project for Spring Bootdescription> <properties> <java.version>1.8java.version> properties> <dependencies> <dependency> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-webartifactId> dependency> <dependency> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-testartifactId> <scope>testscope> <exclusions> <exclusion> <groupId>org.junit.vintagegroupId> <artifactId>junit-vintage-engineartifactId> exclusion> exclusions> dependency> <dependency> <groupId>io.projectreactorgroupId> <artifactId>reactor-testartifactId> <scope>testscope> dependency> <dependency> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-starter-data-redisartifactId> dependency> <dependency> <groupId>org.mybatis.spring.bootgroupId> <artifactId>mybatis-spring-boot-starterartifactId> <version>2.1.3version> dependency> <dependency> <groupId>mysqlgroupId> <artifactId>mysql-connector-javaartifactId> dependency> <dependency> <groupId>com.alibabagroupId> <artifactId>druidartifactId> <version>1.1.23version> dependency> dependencies> <build> <plugins> <plugin> <groupId>org.springframework.bootgroupId> <artifactId>spring-boot-maven-pluginartifactId> plugin> plugins> build> project>
设置配置文件
application.properties
# 连接的那个数据库 spring.redis.database=0 # redis服务的ip地址 spring.redis.host=192.168.199.142 # redis端口号 spring.redis.port=6379 # redis的密码,没设置过密码,可为空 spring.redis.password=12345678 # 端口号 server.port=8081 # ========================数据库相关配置===================== spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver spring.datasource.url=jdbc:mysql://localhost:3306/nba?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai spring.datasource.username=root spring.datasource.password=root # 使用阿里巴巴druid数据源,默认使用自带 spring.datasource.type=com.alibaba.druid.pool.DruidDataSource #开启控制台打印sql mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl # mybatis 下划线转驼峰配置,两者都可以 # mybatis.configuration.mapUnderscoreToCamelCase=true mybatis.configuration.map-underscore-to-camel-case=true # 配置扫描 mybatis.mapper-locations=classpath:mapper/*.xml # 实体类所在的包别名 mybatis.type-aliases-package=com.cyb.mobile.domain
启动类上添加扫描路径
NbaPlayer.java(实体类)
NbaPlayerMapper.xml
xml version="1.0" encoding="UTF-8" ?> DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.cyb.mobile.mapper.NbaPlayerMapper"> <select id="ListNbaPlayer" resultType="NbaPlayer"> SELECT * FROM nba_player select> mapper>
NbaPlayerMapper.java
NbaPlayerService.java
NbaPlayerServiceImpl.java
控制器(Controller)
测试
redis作为mybatis缓存
- 用户第一次访问的时候获取数据库的值,再次访问时直接从缓存中获取数据
- 设置缓存过期时间
代码演示
添加FastJSON依赖
<dependency> <groupId>com.alibabagroupId> <artifactId>fastjsonartifactId> <version>1.2.73version> dependency>
@RequestMapping("test") public Object test(){ //step1 先从redis中取 String strJson=(String) redisUtils.get("nbaPlayerCache"); if (strJson==null){ System.out.println("从db取值"); // step2如果拿不到则从DB取值 ListlistNbaPlayer=nbaPlayerService.ListNbaPlayer(); // step3 DB非空情况刷新redis值 if (listNbaPlayer!=null){ redisUtils.set("nbaPlayerCache", JSON.toJSONString(listNbaPlayer)); return listNbaPlayer; } return null; }else { System.out.println("从redis缓存取值"); return JSONObject.parseArray(strJson,NbaPlayer.class); } }
注意
项目8080是对外端口(向外部暴露的端口),区别于内部进程号,查内部端口用ps -ef|grep port,查外部端口用lsof -i:port
压测工具
上面我们已经SpringBoot整合Redis和Mybatis,但是无法知道具体QPS多少,此时我们可以使用压测工具来测压,点我直达
资料下载
SpringBoot整合Redis、Mybatis下载
链接: https://pan.baidu.com/s/1d4xwXVfA6dYHvLFxha59Kg 密码: bff7
Redis从入门到精通
点我直达