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Redisson应用

应用 Redisson
2023-09-14 09:00:00 时间

Redisson

依赖

<dependency>
     <groupId>org.redisson</groupId>
     <artifactId>redisson</artifactId>
</dependency>

 schema.sql

drop table users if exists;
create table users (
    id bigint auto_increment,
    name varchar(255),
    age int,
    create_time timestamp,
    primary key (id)
);
insert into users (name, create_time,age) values ('Lili', now(),29);
insert into users (name, create_time,age) values ('Fiona', now(),30);
insert into users (name, create_time,age) values ('xyz', now(),30);
insert into users (name, create_time,age) values ('zbc', now(),16);
insert into users (name, create_time,age) values ('Nana', now(),18);
View Code

实体类Users.java

package com.example.demo.model;

import lombok.*;
import org.hibernate.annotations.CreationTimestamp;

import javax.persistence.*;
import java.util.Date;

@Entity
@Table(name = "users")
@Data
@Builder
@ToString(callSuper = true)
@NoArgsConstructor
@AllArgsConstructor
public class Users {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;
    private String name;
    private int age;
    @Column(updatable = false)
    @CreationTimestamp
    private Date createTime;
}
View Code

数据操作接口UsersRepository.java

package com.example.demo.repository;

import com.example.demo.model.Users;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
import org.springframework.stereotype.Repository;

import java.util.List;

@RepositoryRestResource(collectionResourceRel = "user", path = "user")
public interface UsersRepository extends JpaRepository<Users,Integer> {
    List<Users> findByName(@Param("name") String name);
    List<Users> findByNameContaining(@Param("name") String name);
}
View Code

配置类

package com.example.demo.configure;

import lombok.extern.slf4j.Slf4j;
import org.redisson.Redisson;
import org.redisson.api.RedissonClient;
import org.redisson.config.Config;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@Slf4j
public class RedissonConfig extends CachingConfigurerSupport {
    @Value("${spring.redis.host}")
    private String host;
    @Value("${spring.redis.port}")
    private int port;
    @Bean
    public RedissonClient getRedisson() {

        Config config = new Config();
        config.useSingleServer().setAddress("redis://" + host + ":" + port);

        return Redisson.create(config);
    }
}

控制器

package com.example.demo.controller;

import com.example.demo.repository.UsersRepository;
import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RBucket;
import org.redisson.api.RMap;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@Slf4j
@RestController
public class DemoController {
    @Autowired
    UsersRepository usersRepository;
    @Autowired
    private RedissonClient redissonClient;
    @RequestMapping("/redis")
    public String redis() {

        RBucket<String> k1= redissonClient.getBucket("k1");
        k1.set("123456");
        log.info("k1=",k1.get());
        RMap<String,String>  map = redissonClient.getMap("users");
        usersRepository.findAll().forEach(c -> {
            map.put(c.getName(),Integer.toString(c.getAge()));
        });
        String age = map.get("Fiona");
        log.info("Fiona age:"+age);

        return "success";
    }
}

分布式锁的应用

@RequestMapping("/lock")
    public String lock() {

        RLock helloLock = redissonClient.getLock("hello");
        //加锁
        helloLock.lock();
        try {
            log.info("locked");
            Thread.sleep(1000 * 200);
        } catch (InterruptedException e){
            log.error("error",e.getMessage());
        }  finally {
            //释放锁
            helloLock.unlock();
        }
        log.info("finished");
        return "success";
    }

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