Redis的介绍与使用

Redis的介绍与使用

NoSQL 主流的产品是 MongoDB、Redis。

Not Only SQL

Redis 是当下主流的非关系型数据库，基于内存进行存储，支持 key-value 的存储形式，底层是用 C 语言实现的。

Redis 相当于一个 key-value 的数据字典，结构非常简单，没有数据表的概念，直接用键值对形式完成数据的管理，Redis 支持 5 种数据类型：

• 字符串
• 列表
• 集合
• 有序集合
• 哈希

下载 Redis

https://redis.io/

启动 Reids 服务

sudo ../bin/redis-server ./redis.conf

启动 Redis 客户端

../bin/redis-cli

关闭 Redis 服务

shutdown

Spring Boot 整合 Redis

1、pom.xml

<parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.1.5.RELEASE</version>
</parent>

<dependencies>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
  </dependency>

  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
  </dependency>

  <dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-pool2</artifactId>
  </dependency>

  <dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
  </dependency>
</dependencies>

2、创建实体类

package com.m.entity;

import lombok.Data;

import java.io.Serializable;
import java.util.Date;

@Data
public class Student implements Serializable {
    private Integer id;
    private String name;
    private Double score;
    private Date birthday;
}

3、Handler

package com.m.controller;

import com.m.entity.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class StudentHandler {

    @Autowired
    private RedisTemplate redisTemplate;

    @PostMapping("/set")
    public void set(@RequestBody Student student){
        redisTemplate.opsForValue().set("stu",student);
    }
}

4、application.yml

spring:
  redis:
    database: 0
    host: localhost
    port: 6379

5、启动类

package com.m;

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

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

字符串

@GetMapping("/string")
public String stringTest(){
    redisTemplate.opsForValue().set("str","Hello World");
    String str = (String) redisTemplate.opsForValue().get("str");
    return str;
}

列表

@GetMapping("/list")
public List<String> listTest(){
  ListOperations<String,String> list = redisTemplate.opsForList();
  list.leftPush("list","Hello");
  list.leftPush("list","World");
  list.leftPush("list","Java");
  List<String> result = list.range("list",0,2);
  return result;
}

集合

@GetMapping("/set")
public Set<String> setTest(){
    SetOperations<String,String> set = redisTemplate.opsForSet();
    set.add("set","Hello");
    set.add("set","Hello");
    set.add("set","World");
    set.add("set","World");
    set.add("set","Java");
    set.add("set","Java");
    Set<String> result = set.members("set");
    return result;
}

有序集合

@GetMapping("/zset")
public Set<String> zsetTest(){
  ZSetOperations<String,String> zset = redisTemplate.opsForZSet();
  zset.add("zset","Hello",1);
  zset.add("zset","World",2);
  zset.add("zset","Java",3);
  Set<String> result = zset.range("zset",0,2);
  for(String value:result){
    System.out.println(value);
  }
  return result;
}

哈希

HashMap hashMap1 = new HashMap();
hashMap1.put(key1,value1);
HashMap hashMap2 = new HashMap();
hashMap2.put(key2,value2);
HashOperations<String,String,String> hash = redisTemplate.opsForHash();
hash.put(hashMap1,key1,value1);
hash.put(hashMap2,key2,value2);

hashMap1、hashMap2 就是 key，key1 和 key2 就是 hashKey，value1 和 value2 就是 value。

@GetMapping("/hash")
public String hashTest(){
    HashOperations<String,String,String> hash = redisTemplate.opsForHash();
    hash.put("key","hashkey","hello");
    String str = hash.get("key","hashkey");
    return str;
}