Spring Boot整合Redis（gradle + gson + lombok + redisTemplate）

本文创建了gradle项目，用来整合Spring Boot和Redis，用到了gradle + gson + lombok + redisTemplate等技术。
重要文件：

初始化

在​​https://start.spring.io/​​初始化：

引入依赖

在build.gradle里引入依赖：

plugins {
  id 'java'
  id 'org.springframework.boot' version '2.7.8-SNAPSHOT'
  id 'io.spring.dependency-management' version '1.0.15.RELEASE'
}

group = 'com.xiaolong'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'

configurations {
  compileOnly {
    extendsFrom annotationProcessor
  }
}

repositories {
  mavenCentral()
  maven { url 'https://repo.spring.io/milestone' }
  maven { url 'https://repo.spring.io/snapshot' }
}

dependencies {
  implementation 'org.springframework.boot:spring-boot-starter-data-redis'
  implementation 'org.springframework.boot:spring-boot-starter-web'
  implementation 'com.google.code.gson:gson:2.10'
  compileOnly 'org.projectlombok:lombok'
  annotationProcessor 'org.projectlombok:lombok'
  testImplementation 'org.springframework.boot:spring-boot-starter-test'
}

tasks.named('test') {
  useJUnitPlatform()
}

配置文件和启动类

在resources目录下的application.yml文件中配置Redis数据库连接，本地的6379端口：

spring:
  redis:
    host:localhost
    port:6078

如果原来有其他配置文件，可以删掉，新建application.yml。

启动类，这里用注解SpringBootApplication的exclude排除了数据库的驱动程序，免去再去安装数据库驱动，Redis不需要数据库驱动类Redis2Application：

package com.xiaolong.redis2;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
public class Redis2Application {

  public static void main(String[] args) {
    SpringApplication.run(Redis2Application.class, args);
  }

}

控制类和业务模型类

对外提供接口服务的Controller.java

package com.xiaolong.redis2.controller;

import com.xiaolong.redis2.model.Student;
import com.xiaolong.redis2.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class Controller {
    @Autowired
    StudentService studentService;
    @RequestMapping("/saveStudent")
    public void saveStudent(){
        Student newStudent = new Student();
        newStudent.setId("student_001");
        newStudent.setName("Peter");
        newStudent.setScore("100");
        studentService.saveStudent(newStudent);
    }
    @RequestMapping("/findByID/{id}")
    public Student findByID(@PathVariable String id){
        return studentService.findByID(id);
    }
    @RequestMapping("/deleteByID/{id}")
    public void deleteByID(@PathVariable String id){
        studentService.deleteByID(id);
    }
}

这里用注解@RestController注解设置控制器类，用注解@Autowired依赖注入业务逻辑类，用注解@RequestMapping映射路由。

业务模型类：

package com.xiaolong.redis2.model;

import lombok.Data;
@Data
public class Student {
    private String id;
    private String name;
    private String score;
}

这里用到了lombok的注解@Data，无需再去写get和set方法。

业务逻辑类

package com.xiaolong.redis2.service;

import com.xiaolong.redis2.StudentDao;
import com.xiaolong.redis2.model.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class StudentService {
    @Autowired
    private StudentDao studentDao;
    public void saveStudent(Student student) {
        studentDao.saveStudent(student.getId(), 3600, student);
    }
    public Student findByID(String id){
        return studentDao.findByID(id);
    }
    public void deleteByID(String id){
        studentDao.deleteByID(id);
    }
}

通过注解@Service设置业务类，注解@Autowired自动注入DAO对象。

Redis DAO数据库交互类

package com.xiaolong.redis2;

import com.google.gson.Gson;
import com.xiaolong.redis2.model.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Repository;

import java.util.concurrent.TimeUnit;

@Repository
public class StudentDao {
    @Autowired
    private RedisTemplate<String, String> redisTemplate;
    public void saveStudent(String id, int expireTime, Student student) {
        Gson gson = new Gson();
        redisTemplate.opsForValue().set(id, gson.toJson(student), expireTime, TimeUnit.SECONDS);
    }

    public Student findByID(String id) {
        Gson gson = new Gson();
        Student student = null;
        String studentJson = redisTemplate.opsForValue().get(id);
        if(studentJson != null && !studentJson.equals("")) {
            student = gson.fromJson(studentJson, Student.class);
        }
        return student;
    }

    public void deleteByID(String id) {
        redisTemplate.opsForValue().getOperations().delete(id);
    }
}

这里使用redisTemplate与Redis交互，用GSON把数据对象保存成json格式。

结果

​​http://127.0.0.1:8080/saveStudent​​新建数据：

查询：

删除数据：