如何实现分布式id,搜索相关的资料,一般会给出这几种方案:
另外,在我通过爬取知乎用户id发现,知乎的用户id是32位的,初步断定知乎采用的是md5加密,然后全部转换成小写。至于如何爬取知乎用户信息,见我之前分享的文章。本文采取的技术方案采取的是mogoodb的objectId。
MongoDB的ObjectId设计成轻量型的,不同的机器都能用全局唯一的同种方法方便地生成它。MongoDB 从一开始就设计用来作为分布式数据库,处理多个节点是一个核心要求。使其在分片环境中要容易生成得多。
它的格式:
在springboot中引入mongodb:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- 开启web-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--mongodb -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
创建一个实体类:
public class Customer {
@Id
public String id;
public String firstName;
public String lastName;
public Customer() {}
public Customer(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
@Override
public String toString() {
return String.format(
"Customer[id=%s, firstName='%s', lastName='%s']",
id, firstName, lastName);
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
创建mongodb 接口类:
/**
* Created by fangzhipeng on 2017/4/1.
*/
public interface CustomerRepository extends MongoRepository<Customer, String> {
public Customer findByFirstName(String firstName);
public List<Customer> findByLastName(String lastName);
}
测试类:
@Autowired
CustomerRepository customerRepository;
@Test
public void mongodbIdTest(){
Customer customer=new Customer("lxdxil","dd");
customer=customerRepository.save(customer);
logger.info( "mongodbId:"+customer.getId());
}