mysql二级缓存redis_SpringBoot+Mybatis+redis(二级缓存)搭建
剛剛開始接觸Spring Boot，因為極簡單的配置開發，搭建一個通用的Spring Boot+Mybaitis+redis的開發框架。
一、用maven構建項目，pom.xml文件如下：
org.springframework.boot
spring-boot-starter-parent
1.5.1.RELEASE
org.springframework.boot
spring-boot-starter
org.springframework.boot
spring-boot-starter-logging
org.springframework.boot
spring-boot-starter-log4j2
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-test
test
org.mybatis.spring.boot
mybatis-spring-boot-starter
${mybatis-spring-boot}
mysql
mysql-connector-java
${mysql-connector}
org.springframework.boot
spring-boot-starter-cache
org.springframework.boot
spring-boot-starter-redis
1.4.6.RELEASE
junit
junit
4.12
因為用到了spring-boot-starter-parent的版本為1.5.1.RELEASE，所以需要指定spring-boot-starter-redis的版本為1.4.6.RELEASE。r
二、使用
配置文件application.properties如下
## 數據源配置
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
## Mybatis 配置
mybatis.typeAliasesPackage=org.spring.springboot.domain
mybatis.mapperLocations=classpath\:mapper/*.xml
mybatis.config-location=classpath\:mybatis-config.xml
logging.config=classpath\:log4j2.xml
spring.redis.host=localhost
spring.redis.port=6379
spring.redis.pool.max-idle=8
spring.redis.pool.min-idle=0
spring.redis.pool.max-active=8
spring.redis.pool.max-wait=-1
使用MyBatis
創建持久化bean
public class City implements Serializable{
/**
*
*/
private static final long serialVersionUID = -2081742442561524068L;
/**
* 城市編號
*/
private Long id;
/**
* 省份編號
*/
private Long provinceId;
/**
* 城市名稱
*/
private String cityName;
/**
* 描述
*/
private String description;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public Long getProvinceId() {
return provinceId;
}
public void setProvinceId(Long provinceId) {
this.provinceId = provinceId;
}
public String getCityName() {
return cityName;
}
public void setCityName(String cityName) {
this.cityName = cityName;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
數據庫Dao接口，只有一個findByName方法
public interface CityDao {
/**
* 根據城市名稱，查詢城市信息
*
* @param cityName 城市名
*/
City findByName(@Param("cityName") String cityName);
}
CityMapper.xml
id, province_id, city_name, description
select
from city
where city_name = #{cityName}
三、因為使用了Redis作為二級緩存，所以在CityMapper.xml中添加了Redis的緩存實現
Mybatis與Redis的整合如下，在mybatis-config.xml開啟緩存
Redis的緩存實現
public class RedisCache implements Cache
{
private static final Logger logger = LoggerFactory.getLogger(RedisCache.class);
@Autowired
private static JedisConnectionFactory jedisConnectionFactory;
private final String id;
/**
* The {@code ReadWriteLock}.
*/
private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
public RedisCache(final String id) {
if (id == null) {
throw new IllegalArgumentException("Cache instances require an ID");
}
logger.debug("MybatisRedisCache:id=" + id);
this.id = id;
}
@Override
public void clear()
{
JedisConnection connection = null;
try
{
connection = (JedisConnection) jedisConnectionFactory.getConnection();
connection.flushDb();
connection.flushAll();
}
catch (JedisConnectionException e)
{
e.printStackTrace();
}
finally
{
if (connection != null) {
connection.close();
}
}
}
@Override
public String getId()
{
return this.id;
}
@Override
public Object getObject(Object key)
{
Object result = null;
JedisConnection connection = null;
try
{
connection = (JedisConnection) jedisConnectionFactory.getConnection();
RedisSerializer serializer = new JdkSerializationRedisSerializer();
result = serializer.deserialize(connection.get(serializer.serialize(key)));
}
catch (JedisConnectionException e)
{
e.printStackTrace();
}
finally
{
if (connection != null) {
connection.close();
}
}
return result;
}
@Override
public ReadWriteLock getReadWriteLock()
{
return this.readWriteLock;
}
@Override
public int getSize()
{
int result = 0;
JedisConnection connection = null;
try
{
connection = (JedisConnection) jedisConnectionFactory.getConnection();
result = Integer.valueOf(connection.dbSize().toString());
}
catch (JedisConnectionException e)
{
e.printStackTrace();
}
finally
{
if (connection != null) {
connection.close();
}
}
return result;
}
@Override
public void putObject(Object key, Object value)
{
JedisConnection connection = null;
try
{
connection = (JedisConnection) jedisConnectionFactory.getConnection();
RedisSerializer serializer = new JdkSerializationRedisSerializer();
connection.set(serializer.serialize(key), serializer.serialize(value));
}
catch (JedisConnectionException e)
{
e.printStackTrace();
}
finally
{
if (connection != null) {
connection.close();
}
}
}
@Override
public Object removeObject(Object key)
{
JedisConnection connection = null;
Object result = null;
try
{
connection = (JedisConnection) jedisConnectionFactory.getConnection();
RedisSerializer serializer = new JdkSerializationRedisSerializer();
result =connection.expire(serializer.serialize(key), 0);
}
catch (JedisConnectionException e)
{
e.printStackTrace();
}
finally
{
if (connection != null) {
connection.close();
}
}
return result;
}
public static void setJedisConnectionFactory(JedisConnectionFactory jedisConnectionFactory) {
RedisCache.jedisConnectionFactory = jedisConnectionFactory;
}
}
Redis的管理由Spring實現。
總結
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