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这篇文章给大家分享的是有关SpringBoot与SpringCache概念是什么的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。
首先我们知道jpa,jdbc这些东西都是一些规范，比如jdbc，要要连接到数据库，都是需要用到数据库连接，预处理，结果集这三个对象，无论是连接到mysql还是oracle都是需要用到这个三个对象的，这是一种规范，而SpringCache是一种作为缓存的规范，具体实现有redis,EhCahe等
1.pom.xml
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.6.3</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.yl</groupId> <artifactId>cache_redis</artifactId> <version>0.0.1-SNAPSHOT</version> <name>cache_redis</name> <description>Demo project for Spring Boot</description> <properties> <java.version>11</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-cache</artifactId> </dependency> <artifactId>spring-boot-starter-data-redis</artifactId> <artifactId>spring-boot-starter-web</artifactId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
2.application.properties
# redis的配置 spring.redis.host=192.168.244.135 spring.redis.port=6379 spring.redis.password=root123
3.实体类
package com.yl.cache_redis.domain;
import java.io.Serializable;
public class User implements Serializable {
private Integer id;
private String username;
private String password;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
'}';
}
}4.service
package com.yl.cache_redis;
import com.yl.cache_redis.domain.User;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
@Service
public class UserService {
@Cacheable(cacheNames = "u1") //这个注解作用就是将方法的返回值存到缓存中
public User getUserById(Integer id) {
System.out.println("getUserById:" + id);
User user = new User();
user.setId(id);
user.setUsername("root");
user.setPassword("root");
return user;
}
}5.主程序，加上开启缓存的注解
package com.yl.cache_redis;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;
@SpringBootApplication
@EnableCaching //开启缓存功能
public class CacheRedisApplication {
public static void main(String[] args) {
SpringApplication.run(CacheRedisApplication.class, args);
}
}6.测试
6.1）userservice没加@Cacheable注解时
6.2）userservice加@Cacheable注解后，发现sevice中的方法只调用了一次
6.3）在redis中也可以看到缓存中有数据，key为定义好的cacheNames+::+方法的参数
1.SpringCache默认使用cacheNames和方法中的参数结合组成key的，那么如果有多个参数呢？它又是如何组成key的呢？我们可以指定key吗？
2.如何自定义key呢？
1）自定义key
package com.yl.cache_redis;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
import java.util.Arrays;
@Component
public class MyKeyGenerator implements KeyGenerator {
@Override
public Object generate(Object target, Method method, Object... params) {
return target.toString() + ":" + method.getName() + ":" + Arrays.toString(params);
}
}2）测试
1.使用@CachePut注解来更新，注意：@CachePut中的key要和@Cacheable中的key一样，否则更新不了！
1.使用@CacheEvict注解，主要key和要@Cacheable中的key一致
2.测试
1.@Caching注解，可以组合多个注解
2.@CacheConfig注解
1.pom.xml
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.6.3</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.yl</groupId> <artifactId>ehcache</artifactId> <version>0.0.1-SNAPSHOT</version> <name>ehcache</name> <description>Demo project for Spring Boot</description> <properties> <java.version>11</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-cache</artifactId> </dependency> <artifactId>spring-boot-starter-web</artifactId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <groupId>net.sf.ehcache</groupId> <artifactId>ehcache</artifactId> <version>2.10.6</version> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
2.实体类
package com.yl.ehcache.model;
import java.io.Serializable;
public class User implements Serializable {
private Integer id;
private String username;
private String password;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
'}';
}
}3.service
package com.yl.ehcache.service;
import com.yl.ehcache.model.User;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
@Service
public class UserService {
@Cacheable(cacheNames = "user")
public User getUserById(Integer id) {
System.out.println("getUserById()...");
User user = new User();
user.setId(id);
user.setUsername("root");
user.setPassword("root");
return user;
}
@CacheEvict(cacheNames = "user")
public void delete(Integer id) {
System.out.println("delete");
}4.主程序
package com.yl.ehcache;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;
@SpringBootApplication
@EnableCaching
public class EhcacheApplication {
public static void main(String[] args) {
SpringApplication.run(EhcacheApplication.class, args);
}
}5.ehcache.xml
<ehcache> <diskStore path="java.io.tmpdir/shiro-spring-sample"/> <defaultCache maxElementsInMemory = "1000" eternal = "false" timeToIdleSeconds = "120" timeToLiveSeconds = "120" overflowToDisk = "false" diskPersistent = "false" diskExpiryThreadIntervalSeconds = "120"/> <cache name = "user" maxElementsInMemory = "1000" eternal = "false" overflowToDisk = "true" diskPersistent = "true" diskExpiryThreadIntervalSeconds = "600"/> </ehcache>
6.测试
感谢各位的阅读！关于“SpringBoot与SpringCache概念是什么”这篇文章就分享到这里了，希望以上内容可以对大家有一定的帮助，让大家可以学到更多知识，如果觉得文章不错，可以把它分享出去让更多的人看到吧！
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