spring boot整合redis

前序：

    redis是一個緩存，消息代理和功能豐富的鍵值存儲系統。Spring Boot爲Spring Data Redis提供的Jedis和Lettuce客戶端庫和抽象提供了基本的自動配置。有一個spring-boot-starter-data-redis“Starter”用於以默認方式使用Jedis的方便方式收集依賴關係。

正題之mysql數據庫建表

數據庫名：ms

1.建user表

   CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(40) DEFAULT NULL,
  `password` varchar(40) DEFAULT NULL,
  `sex` varchar(5) DEFAULT NULL,
  PRIMARY KEY (`id`)
  ) ENGINE=InnoDB DEFAULT CHARSET=utf8;

2.向user表裏插入一條數據

INSERT INTO USER (id,username,PASSWORD,sex) VALUES ('2','李四','123456','男');
正題之建立maven項目

1 .pom文件

<?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">
    <parent>
        <artifactId>JIXING</artifactId>
        <groupId>com.jixing</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>jixing-consumer-xuanke</artifactId>
    <dependencies>
    <!-- 配置快速啓動 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <!--整合web (springmvc)  -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- springboot整合redis -->
       <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-redis</artifactId>
      </dependency>
        <!-- MYSQL依賴 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId><!--mysql驅動包  -->
        </dependency>
        
        <!-- mybatis依賴 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId><!--boot整合mybatis的關鍵包annotation  -->
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

2.application.xml

server.port=7902
logging.level.com.xuanke.dao= trace
logging.level.org.springframework.web = info
logging.level.com.xuanke=debug
#JPA configure
spring.datasource.url = jdbc:mysql://localhost:3306/msm
spring.datasource.username = root
spring.datasource.password = 172.16.77.181
spring.datasource.driverClassName = com.mysql.jdbc.Driver

#redis 配置
#redis 配置數據庫序列號(0~15)
spring.redis.database=0
#redis 配置主機名
spring.redis.host=192.168.0.98
#redis 配置主機名
spring.redis.port=6379
#redis 配置連接密碼（默認爲空，根據自己情況而定）
spring.redis.password=
#redis 配置連接池的最大數量(使用負值表示沒有限制)
spring.redis.pool.max-active=24
#redis 配置連接池最大空閒連接數
spring.redis.pool.max-idle=8
#redis 配置連接池的最大等待時間(使用負值表示沒有限制)
spring.redis.pool.max-wait=-1
#redis 配置連接池最小空間數
spring.redis.pool.min-idle=0
#redis 配置連接超時時間 單位爲毫秒
spring.redis.timeout=6000


# Specify the DBMS
spring.jpa.database = MYSQL
# Show or not log for each sql query
spring.jpa.show-sql = true
# DDL mode. This is actually a shortcut for the "hibernate.hbm2ddl.auto" property. Default to "create-drop" when using an embedded database, "none" otherwise.
spring.jpa.hibernate.ddl-auto = update
# Hibernate 4 naming strategy fully qualified name. Not supported with Hibernate 5.
spring.jpa.hibernate.naming.strategy = org.hibernate.cfg.ImprovedNamingStrategy
# stripped before adding them to the entity manager)
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
spring.application.name=jixing-consumer-xuanke

3.項目架構

4.UserServieImpl代碼

@Repository
public class UserServiceImpl implements UserService{
	private static final Logger LOGGER=LoggerFactory.getLogger(UserServiceImpl.class);
	@Autowired
	private UserDao userDao;
	@Autowired
	private RedisTemplate redisTemplate;
	@Override
	public User findUserById(int id) {
		//從redis 緩存裏獲取城市信息
		String key="user_"+id;
		ValueOperations<String, User> opsForValue = redisTemplate.opsForValue();
		//緩存是否存在
		boolean haskey=redisTemplate.hasKey(key);
		User user;
		if(haskey){
				user=opsForValue.get(key);
		}else
		{
			//否則從db中取
			user = userDao.findUser(id);
	}

		//插入到緩存裏
		opsForValue.set(key, user,10,TimeUnit.SECONDS);
		LOGGER.info("UserServiceImpl.findUserById():用戶插入緩存",user.toString());
		return user;
	}
}

5.UserController

@RestController
public class UserController {
	@Autowired
	private UserService userService;
		@GetMapping(value="/test")
		public User test(){
			return userService.findUserById(1); 
		}
}

至於Dao代碼在這裏就不再贅述，若有需要請看下面的網址：https://github.com/241600489/jixing-consumer-xuanke