redis的安装和springboot整合redis

梦里梦外; 2022-01-20 15:47 231阅读 0赞

### Redis的安装，以及SpringBoot整合Redis实现缓存操作 ###

*   *  一、Redis的安装
     *  二、SpringBoot整合Redis实现缓存

## 一、Redis的安装 ##

**1、使用docker拉取redis镜像**

docker pull redis

**2、制作redis的容器**

docker run --name -p 6379:6379 -d redis

**3、查看redis容器是否启动**

docker ps -a
    ---如果没有启动就启动redis
    docker start  容器ID

## 二、SpringBoot整合Redis实现缓存 ##

**1、配置yml**

spring:
      datasource:
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://localhost:3306/studentdb?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
        username: root
        password: root
      redis:
        host: 192.168.159.135
        port: 6379
        password:
        database: 0
    
    logging:
      level:
        com.changan.springboot_redis.mapper.*: debug
    debug: true
    
    mybatis:
      type-aliases-package: com.tdh.studentmgr.pojo
      mapper-locations: classpath:mapper/*.xml

**2、在service层的实现类中进行逻辑处理**

@Service
    public class StudentServiceImpl implements StudentService { 
    
        @Autowired
        private StudentMapper studentMapper;
    
        @Autowired
        private RedisTemplate redisTemplate;
    
        @Override
        public List<Student> findAll() { 
          		String key="Student";//设置键名
          		ListOperations<String,Student> list = redisTemplate.opsForList();
          		Boolean bool=redisTemplate.hasKey(key);//判断是否存在该键名
          		 if (bool){ 
                return   list.range(key,0,-1);//如果存在直接从缓存查询返回集合
            }else { 
                 List<Student> students = studentMapper.findAll();
                System.out.println(students);
                list.leftPushAll(key,students);//如果不存在将设置好的key键值和查询数据库的结果放入
                return  students ;//既然都查出来了就直接返回咯
            }
        }
    
        @Override
        public Student findById(Integer id) { 
            String key = "student_"+id;
            //先去redis数据库中查询有没有对应的key值
            Boolean hasKey = redisTemplate.hasKey(key);
            //得到操作string类型的redis对象
            ValueOperations<String,Student> operations = redisTemplate.opsForValue();
            if(hasKey){ //如果有
                //通过key获取value返回给服务器
                Student student = operations.get(key);
                return student;
            }
            Student byId = studentMapper.findById(id);
            operations.set(key,byId);
            return byId;
        }

**3、序列化设置 RedisTemplateConfig**

package com.changan.springboot_redis.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.Jackson2JsonRedisSerializer;
    
    import java.net.UnknownHostException;
    
    @Configuration
    public class RedisTemplateConfig { 
        //覆盖默认的自动配置
        @Bean
        public RedisTemplate<Object, Object> redisTemplate(
                RedisConnectionFactory redisConnectionFactory) throws UnknownHostException { 
    
            RedisTemplate<Object, Object> template = new RedisTemplate<>();
            template.setConnectionFactory(redisConnectionFactory);
            //修改默认的序列化规则
            //1.创建序列化规则对象
            Jackson2JsonRedisSerializer jackson2JsonRedisSerializer=new Jackson2JsonRedisSerializer(Object.class);
            //2.更改默认的序列化规则
            template.setDefaultSerializer(jackson2JsonRedisSerializer);
            return template;
        }
    }

**4、控制层（不做逻辑处理，直接调用就好！）**

@RestController
    public class StudentController { 
    
        @Autowired
        private StudentService studentService;
    
        @GetMapping("/students")
        public List<Student> findAll(){ 
            return studentService.findAll();
        }
    
        @GetMapping("/student/{id}")
        public Student findById(@PathVariable("id")Integer id){ 
            return studentService.findById(id);
        }
    }