这篇文章主要介绍“SpringBoot如何使用Redis缓存”,在日常操作中,相信很多人在SpringBoot如何使用Redis缓存问题上存在疑惑,小编查阅了各式资料,整理出简单好用的操作方法,希望对大家解答”SpringBoot如何使用Redis缓存”的疑惑有所帮助!接下来,请跟着小编一起来学习吧!
1 redis是安装在linux上
安装docker
yum install docker
2)开启docker
service docker start
2 安装Redis
可到这个网站查怎么安装 https://hub.docker.com
开启redis
3 创建springBoot项目(细节不在赘述)
pom.xml文件
<?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 http://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>2.1.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.mao</groupId>
<artifactId>spring-cache</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-cache</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
4 提供一个entity类 //这个文件来自尚学堂里的
public class Employee implements Serializable
private Integer id;
private String lastName;
private String email;
private Integer gender; //性别 1男 0女
private Integer dId;
。。。。。。(简写啦)
}
5 redis的客户请自己安装
相关知识点请到这个网站学习 http://www.redis.cn 里面有很多案例
6 配置属性 application.properties
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/spring_cache
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
#启动驼峰命名法
mybatis.configuration.map-underscore-to-camel-case=true
logging.level.mao.springcache.mapper=debug
#由于我安装的redis没密码,只给主机地址就可以啦
spring.redis.host=192.168.1.139
7 测试下Redis的缓存首先看下源码是怎么写的
public class SpringCacheApplicationTests {
//操作键值对,jdk默认的序列化机制
@Autowired
RedisTemplate redisTemplate;
//操作字符串
@Autowired
StringRedisTemplate stringRedisTemplate;
@Autowired
RedisTemplate<Object,Employee> redisTemplate1;
[@Test](https://my.oschina.net/azibug)
public void test1(){
//stringRedisTemplate.opsForValue().append("hello","hello");
System.out.println(stringRedisTemplate.opsForValue().get("hello"));
}
[@Test](https://my.oschina.net/azibug)
public void test2(){
Employee employee = employeeMapper.getEmployee(1);
redisTemplate.opsForValue().set("emp-01",employee);
}
@Test
public void contextLoads() {
Employee employee = employeeMapper.getEmployee(1);
System.out.println(employee.toString());
}
}
上面test1测试结果:
上面test2测试结果:
接下来解决上面难看的问题:我们重写RedisTemplate 我们想让缓存查看的时候为json
@Configuration
public class myredis {
@Bean
public RedisTemplate<Object, Employee> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
RedisTemplate<Object,Employee> template = new RedisTemplate<Object, Employee>();
template.setConnectionFactory(redisConnectionFactory);
Jackson2JsonRedisSerializer<Employee> ser = new Jackson2JsonRedisSerializer<Employee>(Employee.class);
template.setDefaultSerializer(ser);
return template;
}
}
之前一张图已经展示过原理
下面这张图解释这句haul template.setDefaultSerializer(ser);
重新测试的结果
8 接下啦讲spring项目中使用 //EmployeeService类
@Service
public class EmployeeService {
@Autowired
EmployeeMapper employeeMapper;
//将方法的结果缓存,以后请求相同的数据,直接从缓存中获取,不用调用方法
//CacheManner管理多个Cache组件,对缓存的真正CRUD组件,每个缓存组有自己唯一一个名字
//几个属性,指定缓存的名字key,可以指定@param id
@Cacheable(cacheNames ={"emp"})
public Employee getEmp(Integer id){
System.out.println("查询"+id+"员工");
Employee employee = employeeMapper.getEmployee(id);
return employee;
}
//达到了同步更新缓存的目的,取缓存的key要与放缓存的key相同
@CachePut(cacheNames = "emp",key = "#employee.id")
public Employee updateEmp(Employee employee){
employeeMapper.updateEmp(employee);
return employee;
}
@CacheEvict(value = "emp",key = "#id")
public void deleteEmp(Integer id){
System.out.println("deleteEMp"+id);
public Employee getEmployeeByLastName(String lastName){
return employeeMapper.getEmpByLastName(lastName);
}
}
EmployeeMapper代码
public interface EmployeeMapper {
@Select("select * from employee where id =#{id}")
public Employee getEmployee(Integer id);
@Update("update employee set lastName=#{lastName},email=#{email},gender=#{gender},d_id=#{dId} where id =#{id}")
public void updateEmp(Employee employee);
@Delete("delete * from employee where id=#{id}")
public void deleteEmpById(Integer id);
@Insert("insert into employee(lastName,email,gender,d_id) values(#{lastName},#{email},#{gender},#{dId})")
public void insertEmpployee(Employee employee);
@Select("select * from employee where lastName=#{lastName}")
public Employee getEmpByLastName(String name);
}
EmployeeController.java
@RestController
public class EmployeeController {
@Autowired
EmployeeService employeeService;
@RequestMapping("/emp/{id}")
public Employee getEmployee(@PathVariable("id") Integer id){
Employee employee=employeeService.getEmp(id);
return employee;
}
@GetMapping("/emp")
public Employee updateEmp(Employee employee){
System.out.println("员工更新的方法调用");
Employee employee1 = employeeService.updateEmp(employee);
return employee1;
}
@GetMapping("/delete")
public String deleteEmp(Integer id){
System.out.println("删除一个员工的相关信息");
return "删除员工";
}
@RequestMapping("/emps/{lastName}")
public Employee getByLastName(@PathVariable("lastName") String lastName){
return employeeService.getEmployeeByLastName(lastName);
}
}
应用类的配置 注意
下面是我最想写的,当时看尚学堂的视频一直写不出来的,由于使用的版本不同,我使用的使用2.xxx
下面是我配置的RedisCacheManager
@Configuration
public class myredis {
@Bean
public RedisCacheManager redisCacheManager(RedisConnectionFactory redisConnectionFactory){
Jackson2JsonRedisSerializer<Employee> ser = new Jackson2JsonRedisSerializer<Employee>(Employee.class);
RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(ser));
RedisCacheManager cacheManager = RedisCacheManager.builder(redisConnectionFactory)
.cacheDefaults(config).build();
return cacheManager;
}
} 这个写法和1.xx明显不同
下面是2.xx源码
下面这副图解释这句
RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(ser));
测试结果
到此,关于“SpringBoot如何使用Redis缓存”的学习就结束了,希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习,快去试试吧!若想继续学习更多相关知识,请继续关注亿速云网站,小编会继续努力为大家带来更多实用的文章!
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原文链接:https://my.oschina.net/u/2511906/blog/3073590