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项目已托管于 GitHub：y0ngb1n/spring-boot-samples，欢迎 Star, Fork :kissing_heart:
准备工作
- Spring Boot 2.1.0+
- Redis
- Lombok
- Guava 28.0
- Common Validator 1.6
添加依赖项
pom.xml
<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>commons-validator</groupId>
<artifactId>commons-validator</artifactId>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
</dependency>
</dependencies>
application.yml
spring:
# Redis Config
redis:
url: 127.0.0.1
port: 6379
password: your_password
logging:
level:
io.github.y0ngb1n.*: debug
核心代码
/**
* URL Shortener Resource
*
* @author yangbin
*/
@Slf4j
@RestController
@RequestMapping(path = "/v1")
public class UrlShortenerController {
@Autowired
StringRedisTemplate redisTemplate;
@GetMapping(path = "/{id}")
public String getUrl(@PathVariable String id) {
+ String url = redisTemplate.opsForValue().get(id);
log.debug("URL Retrieved: {}", url);
return url;
}
@PostMapping
public String create(@RequestBody String url) {
UrlValidator urlValidator = new UrlValidator(
new String[]{"http", "https"}
);
if (urlValidator.isValid(url)) {
- String id = Hashing.murmur3_32().hashString(url, StandardCharsets.UTF_8).toString();
log.debug("URL Id generated: {}", id);
+ redisTemplate.opsForValue().set(id, url);
return id;
}
throw new RuntimeException("URL Invalid: " + url);
}
}
使用方式
Step 0: 安装并启动 Redis
# on Windows
scoop install redis
redis-server
# on Mac
brew install redis
redis-server
Step 1: 启动 url-shortener 服务
$ mvn install
...
[INFO] BUILD SUCCESS
...
$ mvn spring-boot:run
...
2019-08-21 21:03:50.215 INFO 10244 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2019-08-21 21:03:50.219 INFO 10244 --- [ main] i.g.y.s.u.UrlShortenerApplication : Started UrlShortenerApplication in 6.01 seconds (JVM running for 12.165)
Step 2: 生成短链
$ curl -X POST http://127.0.0.1:8080/v1 \
-H 'Content-Type: text/plain' \
-d https://y0ngb1n.github.io
515bbe2b
Step 3: 还原短链
$ curl -X GET http://127.0.0.1:8080/v1/515bbe2b
https://y0ngb1n.github.io
查看日志
...
2019-08-21 21:42:26.788 DEBUG 10244 --- [nio-8080-exec-2] i.g.y.s.u.c.UrlShortenerController : URL Id generated: 515bbe2b
2019-08-21 21:42:40.748 DEBUG 10244 --- [nio-8080-exec-3] i.g.y.s.u.c.UrlShortenerController : URL Retrieved: https://y0ngb1n.github.io
参考资料
- https://youtu.be/Zr0E2VP24w8
- https://en.wikipedia.org/wiki/MurmurHash
- https://github.com/google/guava/wiki/HashingExplained
- https://www.flyml.net/2016/09/05/cassandra-tutorial-murmurhash/
- 短网址（Short URL）系统的原理及其实现，by 胡方运
-
如何快速判断某 URL 是否在一个 20 亿的网址 URL 集合中？，by 张振伟
- 应用场景：
黑名单、URL 去重、单词拼写检查、Key-Value 缓存系统的 Key 校验、ID 校验，比如订单系统查询某个订单 ID 是否存在，如果不存在就直接返回
- 应用场景：
- 谈谈全局唯一 ID 生成方法
- Leaf — 美团点评分布式 ID 生成系统
