从零搭建SpringBoot2.X整合Redis框架的详细教程

最近也不知道写啥，看之前写过kafka整合springboot的文章，大家反响还挺热烈的，嘿嘿嘿，就感觉帮助到大家了还挺好的，也算是达到了自己的目的，正好，今天业务模块是springboot整合redis，因为之前做过，所以有现成的代码，cv一下之后就可以了，所以时间比较多，那就给大家整理一下springboot整合redis的代码实现吧，从项目搭建到源码实现，下面全都有，耐心看完，相信会对你有所帮助的

好了，话不多说，我们开始吧，同样的，还是建议能够自己在自己的pc端实现一下
个人公众号：java架构师联盟，每日更新技术好文

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

<?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>2.2.2.release</version>
		<relativepath/> <!-- lookup parent from repository -->
	</parent>
	<groupid>com.heny</groupid>
	<artifactid>spring-boot-redis</artifactid>
	<version>0.0.1-snapshot</version>
	<name>spring-boot-redis</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-web</artifactid>
		</dependency>
		<dependency>
			<groupid>org.mybatis.spring.boot</groupid>
			<artifactid>mybatis-spring-boot-starter</artifactid>
			<version>2.1.1</version>
		</dependency>

		<dependency>
			<groupid>mysql</groupid>
			<artifactid>mysql-connector-java</artifactid>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupid>org.springframework.boot</groupid>
			<artifactid>spring-boot-starter-test</artifactid>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupid>org.junit.vintage</groupid>
					<artifactid>junit-vintage-engine</artifactid>
				</exclusion>
			</exclusions>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupid>org.springframework.boot</groupid>
				<artifactid>spring-boot-maven-plugin</artifactid>
			</plugin>
		</plugins>
	</build>

</project>

5、在pom.xml文件中添加redis的starter

<dependency>
		<groupid>org.springframework.boot</groupid>
		<artifactid>spring-boot-starter-data-redis</artifactid>
	</dependency>

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<object> java(@nullable classloader classloader) {
 return new jdkserializationredisserializer(classloader);
 }

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<object> redisserializer = new genericjackson2jsonredisserializer();

 redisserializationcontext.serializationpair<object> pair = redisserializationcontext.serializationpair.fromserializer(redisserializer);
 rediscacheconfiguration rediscacheconfiguration = rediscacheconfiguration.defaultcacheconfig().serializevalueswith(pair);
 // 默认会将cachename作为key的前缀
 return new rediscachemanager(rediscachewriter, rediscacheconfiguration);
 }
 }

此时，redis中缓存数据就以json的格式进行序列化，如图所示。

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