Redis框架如何搭建SpringBoot2.X
这篇文章主要介绍redis框架如何搭建SpringBoot2.X,文中介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们一定要看完!
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一、使用Spring Initializr创建项目web项目
1、File→New→Project
2、点击Next如图所示,命名好Group和Artifact
3、Next后如图所示,勾选中需要的依赖,Spring Initializr会自动导入所需的starter
4、创建项目成功后,pom.xml文件中的依赖如下
4.0.0 org.springframework.boot spring-boot-starter-parent 2.2.2.RELEASE com.heny spring-boot-redis 0.0.1-SNAPSHOT spring-boot-redis Demo project for Spring Boot 1.8 org.springframework.boot spring-boot-starter-web org.mybatis.spring.boot mybatis-spring-boot-starter 2.1.1 MySQL mysql-connector-java runtime org.springframework.boot spring-boot-starter-test test org.junit.vintage junit-vintage-engine org.springframework.boot spring-boot-maven-plugin
5、在pom.xml文件中添加redis的starter
org.springframework.boot spring-boot-starter-data-redis
6、创建JavaBean用于封装数据库数据,需要实现Serializable
package com.henya.springboot.bean; import java.io.Serializable; 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; public Employee() { super(); } public Employee(Integer id, String lastName, String email, Integer gender, Integer dId) { super(); this.id = id; this.lastName = lastName; this.email = email; this.gender = gender; this.dId = dId; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public Integer getGender() { return gender; } public void setGender(Integer gender) { this.gender = gender; } public Integer getdId() { return dId; } public void setdId(Integer dId) { this.dId = dId; } @Override public String toString() { return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email + ", gender=" + gender + ", dId=" + dId + "]"; } }
注意:
在写JavaBean对象时需要实现Serializable接口否则会报以下错误:
Cannot deserialize; nested exception is org.springframework.core.serializer.support.SerializationFailedException
7、整合Mybatis操作数据库,在application.properties配置文件中配置数据源信息
#serverTimezone用于指定时区,不然会报错 spring.datasource.url=jdbc:mysql://localhost:3306/cache?serverTimezone=UTC spring.datasource.username=root spring.datasource.password=123456 # 开启驼峰命名法规则 mybatis.configuration.map-underscore-to-camel-case=true #日志级别 logging.level.com.henya.springboot.mapper=debug
8、使用注解版Mybatis创建Mapper
package com.henya.springboot.mapper; import com.henya.springboot.bean.Employee; import org.apache.ibatis.annotations.*; @Mapper public interface EmployeeMapper { @Select("SELECT * FROM employee WHERE id=#{id}") public Employee getEmpById(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 emlpoyee WHERE id=#{id}") public void delEmpById(Integer id); @Insert("INSERT INTO employee(lastName, email, gender, d_id) VALUES (#{lastName}, #{email}, #{gender}, #{dId})") public Employee insertEmp(Employee employee); @Select("SELECT * FROM employee WHERE lastName=#{lastName}") public Employee getEmpByLastName(String lastName); }
注意:
需要使用使用@MapperScan注解扫描Mapper所在的接口,只需要加在主程序类上即可。除此之外,还要使用@EnableCaching用于开启缓存。
@MapperScan("com.henya.springboot.mapper") @SpringBootApplication @EnableCaching //开启缓存 public class SpringBootRedisApplication { public static void main(String[] args) { SpringApplication.run(SpringBootRedisApplication.class, args); } }
9、编写Service类,用于访问数据库或redis缓存
package com.henya.springboot.service; import com.henya.springboot.bean.Employee; import com.henya.springboot.mapper.EmployeeMapper; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.cache.annotation.*; import org.springframework.stereotype.Service; @CacheConfig(cacheNames = "emp") //抽取缓存的公共配置 @Service public class EmployeeService { @Autowired EmployeeMapper employeeMapper; /** * @param id * @return */ @Cacheable(cacheNames = {"emp"},keyGenerator = "myKeyGenerator") public Employee getEmpById(Integer id) { System.err.println("开始查询"+ id +"号员工"); Employee employee = employeeMapper.getEmpById(id); return employee; } /** * @CachePut:既调用方法(这个方法必须要执行),又更新缓存数据 * @param employee * @return */ @CachePut(value = "emp",key = "#result.id") public Employee updateEmp(Employee employee){ System.err.println("开始更新" + employee.getId() + "号员工"); employeeMapper.updateEmp(employee); return employee; } /** * @CacheEvict:缓存清除 * @param id */ @CacheEvict(value = "emp",beforeInvocation = true) public void deleteEmp(Integer id){ System.err.println("删除" + id + "员工"); int i = 10/0; }
10、编写Controller类
package com.henya.springboot.controller; import com.henya.springboot.bean.Employee; import com.henya.springboot.service.EmployeeService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RestController; /** * @Description: * @Author:HenYa * @CreatTime:2019/12/1 12:44 */ @RestController public class EmployeeController { @Autowired EmployeeService employeeService; @GetMapping("/emp/{id}") public Employee getEmpById(@PathVariable("id") Integer id){ Employee employee = employeeService.getEmpById(id); return employee; } @GetMapping("/emp") public Employee updateEmp(Employee employee){ Employee emp = employeeService.updateEmp(employee); return emp; } }
二、测试SpringBoot整合Redis是否成功
1、在浏览器访问,也可以使用测试类,笔者使用了浏览器访问http://localhost:8080/emp/1进行测试,初次访问时,控制台会提示开始查询1号员工,如图所示。
2、再次访问时,控制台并没有sql日志,如图所示。
3、此时使用RedisDesktopManager工具查看redis时有数据,并且cacheName为emp,如图所示
只是emp对象被序列化了。查看源码可知Redis默认使用Jdk进行序列化。
static RedisSerializer
查看RedisSerializer接口的实现有以下几种:
我们常用的就是以json的格式进行序列化。但是需要自定义RedisCacheManager。
三、自定义RedisCacheManager
package com.henya.springboot.config; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.redis.cache.RedisCacheConfiguration; import org.springframework.data.redis.cache.RedisCacheManager; import org.springframework.data.redis.cache.RedisCacheWriter; import org.springframework.data.redis.connection.RedisConnectionFactory; import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer; import org.springframework.data.redis.serializer.RedisSerializationContext; import org.springframework.data.redis.serializer.RedisSerializer; /** * @Description: * @Author:HenYa * @CreatTime:2019/12/6 20:50 */ @Configuration public class MyRedisConfig { @Bean public RedisCacheManager empCacheManager(RedisConnectionFactory redisConnectionFactory){ //RedisCacheManager redisCacheManager = new RedisCacheManager(redisConnectionFactory); RedisCacheWriter redisCacheWriter = RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory); RedisSerializer
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文章名称:Redis框架如何搭建SpringBoot2.X
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