spring boot 整合 redis与redis缓存示例代码

一:整合redis

1.引入倚赖

 
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-starter-data-redis
        

spring-boot-starter-data-redis默认使用的工具是Lettuce,而是用jedis则倚赖如下

	
			org.springframework.boot
			spring-boot-starter-data-redis
			
				
					io.lettuce
					lettuce-core
				
			
		
		
			redis.clients
			jedis
		
		
			org.springframework.boot
			spring-boot-starter-web
		

2. application.properties

#redis库的编号,默认是16个database,编号0~15号
spring.redis.database=0
spring.redis.host=127.0.0.1
spring.redis.port=6379
#spring.redis.password=123@456
#连接池配置
#使用lettuce的配置
#spring.redis.lettuce.pool.max-active=
#spring.redis.lettuce.pool.max-idle=
#spring.redis.lettuce.pool.max-wait=
#spring.redis.lettuce.pool.min-idle=
#spring.redis.lettuce.shutdown-timeout=
#使用jedis的配置
#连接池最大连接数
spring.redis.jedis.pool.max-active=8
#连接池中的最大空闲连接
spring.redis.jedis.pool.max-idle=8
#连接池最大阻塞等待时间（使用负值表示没有限制）
spring.redis.jedis.pool.max-wait=-1ms
#连接池中的最小空闲连接
spring.redis.jedis.pool.min-idle=0

3. 实体类

package org.sang;

import java.io.Serializable;

/**
 * Created by sang on 2018/7/18.
 */
public class Book implements Serializable {
    private Integer id;
    private String name;
    private String author;
    //省略getter/setter


    @Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", author='" + author + '\'' +
                '}';
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }
}

4.测试

package org.sang;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Created by sang on 2018/7/18.
 */
@RestController
public class BookController  {
    @Autowired
    RedisTemplate redisTemplate;
    /**
     * StringRedisTemplate 是RedisTemplate的子类,StringRedisTemplate中的key和value都是字符串
     * RedisTemplate则可以造作对象
     */
    @Autowired
    StringRedisTemplate stringRedisTemplate;
    @GetMapping("/test1")
    public void test1() {
        ValueOperations ops1 = stringRedisTemplate.opsForValue();
        ops1.set("name", "三国演义");
        String name = ops1.get("name");
        System.out.println(name);
        ValueOperations ops2 = redisTemplate.opsForValue();
        Book b1 = new Book();
        b1.setId(1);
        b1.setName("红楼梦");
        b1.setAuthor("曹雪芹");
        ops2.set("b1", b1);
        Book book = (Book) ops2.get("b1");
        System.out.println(book);
        /*三国演义
Book{id=1, name='红楼梦', author='曹雪芹'}*/
    }
}

二:做缓存

1.倚赖中还要再添加

        
            org.springframework.boot
            spring-boot-starter-cache
        

配置文件中添加

#缓存配置
# 缓存名称,redis中key前缀为"缓存名::"
spring.cache.cache-names=c1,c2
#key的过期时间
spring.cache.redis.time-to-live=1800s

3. 开启缓存

@SpringBootApplication
@EnableCaching
public class RediscacheApplication {
    public static void main(String[] args) {
        SpringApplication.run(RediscacheApplication.class, args);
    }
}

4. 实体类同上DAO如下

package org.sang.rediscache;

import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Repository;

@Repository
public class BookDao {
    @Cacheable("c1")
    public Book getBookById(Integer id) {
        System.out.println("getBookById");
        Book book = new Book();
        book.setId(id);
        book.setName("三国演义");
        book.setAuthor("罗贯中");
        return book;
    }
}

5.测试

package org.sang.rediscache;

import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Repository;

@Repository
public class BookDao {
    @Cacheable("c1")
    public Book getBookById(Integer id) {
        System.out.println("getBookById");
        Book book = new Book();
        book.setId(id);
        book.setName("三国演义");
        book.setAuthor("罗贯中");
        return book;
        //Book{id=1, name='三国演义', author='罗贯中'}
        //Book{id=2, name='三国演义', author='罗贯中'}
        //Book{id=3, name='三国演义', author='罗贯中'}
    }
}

6.遇到的问题

• 出现错误ERR wrong number of arguments for 'set' command，后来发现是redis版本问题，本人使用的是win下最新的版本，后来更换其它版本后成功运行