导入依赖
菜单大部分情况下不会出现变化,我们可以将其放入Redis 加快加载速度
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<!-- commons-pool2 对象池依赖 -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
</dependency>
基本配置
redis:
timeout: 10000ms # 连接超时时间
host: 192.168.10.100 # Redis服务器地址
port: 6379 # Redis服务器端口
database: 0 # 选择哪个库,默认0库
lettuce:
pool:
max-active: 1024 # 最大连接数,默认 8
max-wait: 10000ms # 最大连接阻塞等待时间,单位毫秒,默认 -1
max-idle: 200 # 最大空闲连接,默认 8
min-idle: 5 # 最小空闲连接,默认 0
使用RedisTemplate访问redis
RedisConfig.java
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import
org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import
org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
@Configuration
public class RedisConfig {
@Bean
public RedisTemplate<String,Object> redisTemplate(LettuceConnectionFactory
redisConnectionFactory){
RedisTemplate<String,Object> redisTemplate = new RedisTemplate<>();
//为string类型key设置序列器
redisTemplate.setKeySerializer(new StringRedisSerializer());
//为string类型value设置序列器
redisTemplate.setValueSerializer(new
GenericJackson2JsonRedisSerializer());
//为hash类型key设置序列器
redisTemplate.setHashKeySerializer(new StringRedisSerializer());
//为hash类型value设置序列器
redisTemplate.setHashValueSerializer(new
GenericJackson2JsonRedisSerializer());
redisTemplate.setConnectionFactory(redisConnectionFactory);
return redisTemplate;
}
}
修改菜单方法:
MenuServiceImpl.java
@Override
public List<Menu> getMenusByAdminId() {
Integer adminId = ((Admin)
SecurityContextHolder.getContext().getAuthentication().getPrincipal()).getId();
ValueOperations<String, Object> valueOperations =
redisTemplate.opsForValue();
//查询缓存中是否有数据
List<Menu> menus = (List<Menu>) valueOperations.get("menu_" + adminId);
if (CollectionUtils.isEmpty(menus)){
menus = menuMapper.getMenusByAdminId(adminId);
valueOperations.set("menu_"+adminId,menus);
}
return menus;
}
使用Redisrepository访问redis
需要声明一配置项用于启用Repository以及模板
public class RedisConfig {
@Bean
public LettuceConnectionFactory redisConnectionFactory() {
RedisStandaloneConfiguration redisStandaloneConfiguration = new RedisStandaloneConfiguration("127.0.0.1", 6567);
redisStandaloneConfiguration.setPassword("password");//如果有密码需要通过这个函数设置密码
return new LettuceConnectionFactory(redisStandaloneConfiguration);
}
@Bean
public JedisConnectionFactory jedisConnectionFactory(){
//如果使用jedis作为客户端也需要声明该bean 使用与上面的类似
}
@Bean
public RedisTemplate<?,?> redisTemplate(){
RedisTemplate<String,Object> template = new RedisTemplate<>();
RedisSerializer<String> stringSerializer = new StringRedisSerializer();
JdkSerializationRedisSerializer jdkSerializationRedisSerializer = new JdkSerializationRedisSerializer();
template.setConnectionFactory(redisConnectionFactory());
template.setKeySerializer(stringSerializer);
template.setHashKeySerializer(stringSerializer);
template.setValueSerializer(stringSerializer);
template.setHashValueSerializer(jdkSerializationRedisSerializer);
template.setEnableTransactionSupport(true);
template.afterPropertiesSet();
return template;
}
}
实例:
entity
import lombok.Data;
import lombok.experimental.Accessors;
import org.springframework.data.redis.core.RedisHash;
import org.springframework.data.redis.core.index.Indexed;
@Accessors(chain = true)
@Data
@RedisHash(value="Student",timeToLive = 10)
public class stu implements Serializable {
public enum Gender{
MALE,FEMALE
}
private String id;
@Indexed
private String name;
private Gender gender;
//RedisHash注解用于声明该实体将被存储与RedisHash中,如果需要使用repository的数据访问形式,这个注解是必须用到的 timetoLive为实体对象在数据库的有效期
//@Indexed用于标注需要作为查询条件的属性
}
写接口
repository:
@Repository
public interface StuRepository extends CrudRepository<stu,String> {
stu findByName(String name);
//自定义查询方法,使用了@Indexed的name属性查询
}
调用:
@SpringBootTest
public class RedisApplicationTests {
@Autowired
StuRepository stuRepository;
@Test
void testSave(){
stu student = new stu().setId("0002").setName("xiaoming").setGender(stu.Gender.FEMALE);
stuRepository.save(student);//根据id更新或者新增记录
}
@Test
void testFindBy(){
//使用主键查询
assert stuRepository.findById("0002").isPresent();
//根据自定义方法查询
assert stuRepository.findByName("xiaoming") !=null;
}
}
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