SpringBoot中使用Redis案例详解_Java

1.配置xml文件

<dependencies>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter</artifactid>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-data-redis</artifactid>
        </dependency>
        <dependency>
            <groupid>org.projectlombok</groupid>
            <artifactid>lombok</artifactid>
        </dependency>
        <dependency>
            <groupid>com.mysql</groupid>
            <artifactid>mysql-connector-j</artifactid>
        </dependency>
        <dependency>
            <groupid>com.baomidou</groupid>
            <artifactid>mybatis-plus-spring-boot3-starter</artifactid>
            <version>3.5.12</version>
        </dependency>
        <dependency>
            <groupid>com.alibaba</groupid>
            <artifactid>druid-spring-boot-3-starter</artifactid>
            <version>1.2.20</version>
        </dependency>
        <!--对象和json字符相互转换-->
        <dependency>
            <groupid>com.alibaba</groupid>
            <artifactid>fastjson</artifactid>
            <version>2.0.32</version>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-test</artifactid>
        </dependency>
    </dependencies>

2.在resources包下创建application.yml文件，并进行配置

spring:
  data:
    redis:
      host: 192.168.11.88//自己redis的ip地址
      port: 6379
  datasource:
    driver-class-name: com.mysql.cj.jdbc.driver
    url: jdbc:mysql://localhost:3306/test_db1
    username: root
    password: 123456
mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.stdoutimpl

3.将app.java改为项目名称+application.java(springboot的核心启动类)

负责初始化并启动整个 spring boot 应用

package com.jiazhong.mingxing.boot.boot052; // 1. 包声明
import org.springframework.boot.springapplication; // 2. 核心类导入
import org.springframework.boot.autoconfigure.springbootapplication; // 3. 核心注解导入
@springbootapplication // 4. 核心注解（关键）
public class boot052application { // 5. 启动类（类名通常与项目名对应）
    // 6. 程序入口（main方法，jvm启动时执行）
    public static void main(string[] args) {
        // 7. 启动spring boot应用的核心方法
        springapplication.run(boot052application.class, args);
    }
}

4.编写bean包

（主要用于存放实体类（也称为 java bean），这些类通常用于封装数据，是应用中数据传递和存储的载体）

package com.jiazhong.mingxing.boot.boot052.bean;
import com.baomidou.mybatisplus.annotation.tableid;
import com.baomidou.mybatisplus.annotation.tablelogic;
import lombok.data;
import lombok.noargsconstructor;
@data
@noargsconstructor
public class student {
    @tableid(value = "id")
    private long id;
    private string name;
    private string stuno;
    private string password;
    private character gender;
    private string birthday;
    private string placeoforigin;
    private string createtime;
    private long schoolid;
    private long courseid;
    @tablelogic(delval = "1",value = "0")
    private integer state;
    private string enrollmentdate;
    private string updatetime;
}

5.编写mapper包

定义数据库操作接口：声明 crud（增删改查）等数据库操作方法（如selectbyid、insert、update）。
映射 sql 语句：通过 xml 文件或注解方式，将接口方法与具体的 sql 语句关联。
隔离数据访问逻辑：使 service 层无需关注数据库操作细节，只需调用 mapper 接口方法即可。

package com.jiazhong.mingxing.boot.boot052.mapper;
import com.baomidou.mybatisplus.core.mapper.basemapper;
import com.jiazhong.mingxing.boot.boot052.bean.student;
import org.apache.ibatis.annotations.mapper;
@mapper
public interface studentmapper extends basemapper<student> {
}

6.编写service包下的service类

service包（通常命名为com.xxx.service）是业务逻辑层的核心，负责实现应用的核心业务逻辑，协调数据访问层（mapper）和控制层（controller）之间的交互，是整个应用的 “业务处理中心”。

package com.jiazhong.mingxing.boot.boot052.service;
import com.baomidou.mybatisplus.extension.service.iservice;
import com.jiazhong.mingxing.boot.boot052.bean.student;
import org.springframework.stereotype.service;
import java.util.list;
@service
public interface studentservice extends iservice<student> {
    student findstudentbyid(string id);
    //redis存储string类型的内容
    list<student> findall1();
   //redis存储list类型的内容
    list<student> findall2();
    list<student> findall3();
    //添加学生信息
    int savestudent(student student);
    //修改学生信息
    int updatestudent(student student);
    //删除学生信息
    int removestudent(string id);
}

7.编写service报下的实现类

package com.jiazhong.mingxing.boot.boot052.service.impl;
import com.alibaba.fastjson.jsonarray;
import com.baomidou.mybatisplus.core.conditions.query.querywrapper;
import com.baomidou.mybatisplus.extension.service.impl.serviceimpl;
import com.jiazhong.mingxing.boot.boot052.bean.student;
import com.jiazhong.mingxing.boot.boot052.mapper.studentmapper;
import com.jiazhong.mingxing.boot.boot052.service.studentservice;
import lombok.extern.slf4j.slf4j;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.data.redis.core.listoperations;
import org.springframework.data.redis.core.stringredistemplate;
import org.springframework.data.redis.core.valueoperations;
import org.springframework.stereotype.service;
import java.util.arraylist;
import java.util.list;
import java.util.concurrent.timeunit;
@slf4j
@service
public class studentserviceimpl extends serviceimpl<studentmapper, student> implements studentservice {
   /* @resource
    private stringredistemplate stringredistemplate;
    @resource
    private studentmapper studentmapper;*/
    private stringredistemplate stringredistemplate;
    private studentmapper studentmapper;
    private valueoperations<string,string> forvalue;
    private listoperations<string, string> forlist;
    public static final string prefix_student="prefix_student";
    public static final string all_student="all_student";
    @autowired//构造器
    public studentserviceimpl(stringredistemplate stringredistemplate, studentmapper studentmapper) {
        this.stringredistemplate = stringredistemplate;
        this.studentmapper = studentmapper;
        this.forvalue=stringredistemplate.opsforvalue();
        this.forlist=stringredistemplate.opsforlist();
    }
    @override
    public student findstudentbyid(string id) {
        log.info("开始查询id:{}的数据",id);
        //1.从redis中获取到指定id的数据
        string studentjson = forvalue.get(prefix_student + id);
        log.info("返回id:{}的数据:{}",id,studentjson);
        //2.如果存在，返回该数据
        if (studentjson!=null){
            log.info("存在该数据，结束！");
            return jsonarray.parseobject(studentjson, student.class);
        }
        //3.如果不存在该数据，从数据库中获取
        student student = studentmapper.selectbyid(id);
        log.info("不存在该数据，从数据库中获取到数据:{}",student);
        //4.存放到redis中
        string jsonstring = jsonarray.tojsonstring(student);
        forvalue.set(prefix_student+id,jsonstring,1, timeunit.hours);
        log.info("存放数据到redis中");
        //5.返回数据
        return student;
    }
    @override
    public list<student> findall1() {
        //1.从redis中获取
        string json = forvalue.get(all_student);
        //2.如果存在，返回数据，结束
        if (json!=null){
            return jsonarray.parsearray(json, student.class);
        }
        //3.如果不存在，连接数据库
        list<student> all_student = this.list();
        //4.将数据存放到redis中
        string jsonstring = jsonarray.tojsonstring(all_student);
        forvalue.set(all_student,jsonstring,1, timeunit.hours);
        //5.返回数据
        return all_student;
    }
    @override
    public list<student> findall2() {
        //1.从redis中获取
        list<string> stringlist = forlist.range(all_student, 0, -1);
        //2.如果存在，返回数据，结束
        if (stringlist!=null && !stringlist.isempty()){
            list<student> all_student=new arraylist<>();//产生空集合
            stringlist.foreach(s -> {
                student student=jsonarray.parseobject(s,student.class);
                all_student.add(student);
            });
            return all_student;
        }
        //3.如果不存在，连接数据库
        list<student> list = this.list();
        //4.将数据存放到redis中(一个一个的转成json字符串，然后放到列表中)
        list.foreach(student -> {
            string s = jsonarray.tojsonstring(student);
            forlist.rightpush(all_student,s);
        });
        //5.返回数据
        return list;
    }
    @override
    public list<student> findall3() {
        //1.从redis中获取数据
        list<string> stringlist = forlist.range(all_student, 0, -1);
        //2.如果存在返回数据结果
        if (stringlist!=null && !stringlist.isempty()){
            list<student> all_students = new arraylist<>();
            stringlist.foreach(id -> {
                string json = forvalue.get(id);
                student student = jsonarray.parseobject(json, student.class);
                all_students.add(student);
            });
            return all_students;
        }
        //3.如果数据不存在，连接数据库
        list<student> list=this.list();
        //4.将对象存放到redis中
        list.foreach(student -> {
            //4.1将id存放到集合中
            forlist.rightpush(all_student,student.getid()+"");
            //4.2将对象存放到了string中
            forvalue.set(student.getid()+"",jsonarray.tojsonstring(student));
        });
        //5.返回数据
        return list;
    }
    @override
    public int savestudent(student student) {
        //1.将数据添加到数据库中
        boolean b = this.save(student);
        //2.将刚才录入到数据库的数据查询出来
        querywrapper<student> querywrapper=new querywrapper<>();
        querywrapper.eq("name",student.getname());
        querywrapper.eq("stu_no",student.getstuno());
        student one=getone(querywrapper);
        //3.将数据添加到缓存中
        //3.1 将one存放到string中
        forvalue.set(one.getid()+"",jsonarray.tojsonstring(one));
        //3.2 将id存放到索引区list
        forlist.rightpush(all_student,one.getid()+"");
        return b?1:0;
    }
    /*@override
    public int savestudent(student student) {
        //1.将数据添加到数据库中
        boolean b = this.save(student);
        //2.将刚才录入到数据库的数据查询出来
        querywrapper<student> querywrapper=new querywrapper<>();
        querywrapper.eq("name",student.getname());
        querywrapper.eq("stu_no",student.getstuno());
        student one=getone(querywrapper);
        //3.将数据添加到缓存中
        string s = jsonarray.tojsonstring(one);
        forlist.rightpush(all_student,s);
        return b?1:0;
    }*/
    @override
    public int updatestudent(student student) {
        //1.修改数据库数据
        boolean b = updatebyid(student);
        //2.取出刚修改的数据
        querywrapper<student> querywrapper=new querywrapper<>();
        querywrapper.eq("id",student.getid());
        student sqlstudent=getone(querywrapper);
        //3.修改redis缓存中的数据
        forvalue.setifpresent(sqlstudent.getid()+"",jsonarray.tojsonstring(sqlstudent));
        return 0;
    }
    @override
    public int removestudent(string id) {
        //1.删除数据库中的数据
        boolean b = removebyid(id);
        //2.删除redis缓存中的数据
        forlist.remove(all_student,1,id+"");
        stringredistemplate.delete(id+"");
        //3.返回结果
        return b?1:0;
    }
    /*@override
    public int updatestudent(student student) {
        //1.修改数据库中的数据
        boolean update = updatebyid(student);
        //2.取出刚修改的数据
        querywrapper<student> querywrapper=new querywrapper<>();
        querywrapper.eq("id",student.getid());
        student sqlstudent=getone(querywrapper);
        //3.修改redis缓存中的数据
        list<string> stringlist = forlist.range(all_student, 0, -1);
        if (stringlist!=null && !stringlist.isempty()){
            final int[] index={0};
            stringlist.foreach(s->{
                student one=jsonarray.parseobject(s,student.class);
                if (one.getid().equals(student.getid())){
                    forlist.set(all_student,index[0],jsonarray.tojsonstring(sqlstudent));
                    index[0]++;
                }
            });
        }
        return update?1:0;
    }*/
}

8.测试

package com.jiazhong.mingxing.boot.boot052.test;
import com.jiazhong.mingxing.boot.boot052.bean.student;
import com.jiazhong.mingxing.boot.boot052.service.studentservice;
import jakarta.annotation.resource;
import lombok.extern.slf4j.slf4j;
import org.junit.jupiter.api.test;
import org.springframework.boot.test.context.springboottest;
import java.util.list;
@springboottest
@slf4j
public class app {
    @resource
    private studentservice studentservice;
    @test
    //根据id查询学生信息
    public void a(){
        student studentbyid = studentservice.findstudentbyid("1966797153254133762");
        log.info("studentbyid:{}",studentbyid);
    }
    @test
    //查询所有学生信息
    public void b1(){
        list<student> allstudent = studentservice.findall1();
        log.info("allstudent:{}",allstudent);
    }
    @test
    //查询所有学生信息(存储list类型的内容)
    public void b2(){
        list<student> allstudent = studentservice.findall2();
        allstudent.foreach(e->{
            log.info("e:{}",e);
        });
    }
    @test
    public void b3(){
        list<student> allstudent = studentservice.findall3();
        allstudent.foreach(e->{
            log.info("e:{}",e);
        });
    }
    @test
    //添加学生信息
    public void c(){
        student student = new student();
        student.setname("许锦阳");
        student.setplaceoforigin("陕西咸阳");
        student.setcourseid(1965250158253547036l);
        student.setschoolid(1965321181514842113l);
        student.setbirthday("2004-9-19");
        student.setstuno("jk202502287783");
        student.setgender('男');
        int i = studentservice.savestudent(student);
        log.info("i:{}",i);
    }
    @test
    //修改学生信息
    public void d(){
        student student = new student();
        student.setid(1966797153254133762l);
        student.setbirthday("2005-3-16");
        studentservice.updatestudent(student);
    }
    @test
    //删除学生信息
    public void e(){
        int i = studentservice.removestudent("1967044502643716098");
        log.info("i:{}",i);
    }
}

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