利用Redis生成數據庫全局唯一性id

1.利用springboot整個redis

  pom文件

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

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

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

2. yml文件

spring:
  application:
    name: redis-demo
  redis:
    database: 0
    host: 127.0.0.1
    port: 6379
    timeout: 0  # 連接超時時間（毫秒）
    pool:
      max-active: 20 # 連接池最大連接數（使用負值表示沒有限制）
      max-idle: 20  # 連接池中的最大空閒連接
      max-wait: -1 # 連接池最大阻塞等待時間（使用負值表示沒有限制）
      min-idle: 0 # 連接池中的最小空閒連接
server:
  port: 8080
  servlet:
    context-path: /redis-demo

3.redis config 配置

package com.example.demo.config;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;

import java.util.Arrays;

/**
 * @Title: redis配置類
 * @Package RedisConfig
 * redis配置類
 * @author syliu
 * @create 2017/9/29 0029
 */
@Configuration
public class RedisConfig {


    @Bean
    public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory factory) {
        StringRedisTemplate template = new StringRedisTemplate(factory);
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(objectMapper);
        template.setValueSerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();
        return template;
    }


}

4. 生成方式

package com.example.demo.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.util.Calendar;
import java.util.Date;

/**
 * @author syliu
 * 利用redis生成數據庫全局唯一性id
 */
@Service
public class PrimaryKeyService {

    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 獲取年的後兩位加上一年多少天+當前小時數作爲前綴
     * @param date
     * @return
     */
    public String getOrderIdPrefix(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH);
        int day = calendar.get(Calendar.DAY_OF_MONTH);
        int hour = calendar.get(Calendar.HOUR_OF_DAY);
        //補兩位,因爲一年最多三位數
        String monthFormat = String.format("%1$02d", month+1);
        //補兩位，因爲日最多兩位數
        String dayFormat = String.format("%1$02d", day);
        //補兩位，因爲小時最多兩位數
        String hourFormat = String.format("%1$02d", hour);
        return year + monthFormat + dayFormat+hourFormat;
    }

    /**
     * 生成訂單
     * @param prefix
     * @return
     */
    public Long orderId(String prefix) {
        String key = "DEMO_ORDER_ID_" + prefix;
        String orderId = null;
        try {
            Long increment = redisTemplate.opsForValue().increment(key,1);
            //往前補6位
            orderId=prefix+String.format("%1$06d",increment);
        } catch (Exception e) {
            System.out.println("生成訂單號失敗");
            e.printStackTrace();
        }
        return Long.valueOf(orderId);
    }
}

5.測試類

package com.example.demo;

import com.example.demo.service.PrimaryKeyService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.Date;
@RunWith(SpringRunner.class)
@SpringBootTest
public class DemoApplicationTests {
    @Autowired
    private PrimaryKeyService primaryKeyService;

    @Test
    public void contextLoads() {
        long startMillis = System.currentTimeMillis();
        String orderIdPrefix = primaryKeyService.getOrderIdPrefix(new Date());
        for (int i = 0; i < 10; i++) {
            Long aLong = primaryKeyService.orderId(orderIdPrefix);
            System.out.println(aLong);
        }
        long endMillis = System.currentTimeMillis();
        System.out.println("生成速度:"+(endMillis-startMillis)+",單位毫秒");
    }

}

6.測試結果

 

打印訂單號：