Java MongoDb获取id作为时间戳但需要十六进制字符串

Question

我正在为名为 Schema 的集合执行 CRUD，并且需要将 de _id 作为十六进制字符串检索，但是当我使用 collection.find() 时，我得到的是时间戳和日期而不是字符串。

我收到这个结构：

{
"_id": {
            "timestamp": 1604689898,
            "date": "2020-11-06T19:11:38.000+00:00"
        }
}

但我需要这样的东西：

{
"_id": "5fa5a085a4b09b307d53ed57"
}

这是我的配置

Pom.xml

{
"_id": {
            "timestamp": 1604689898,
            "date": "2020-11-06T19:11:38.000+00:00"
        }
}

MongoClient配置

{
"_id": "5fa5a085a4b09b307d53ed57"
}

模式模型

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>co.com.itau</groupId>
    <artifactId>crypto-mongodb-java-ms</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>crypto-mongodb-java-ms</name>
    <description>Microservice to save and read data from mongoDB using CSFLE</description>

    <properties>
        <java.version>1.8</java.version>
        <version.fabric8-maven-plugin>3.5.41</version.fabric8-maven-plugin>
        <swagger.version>3.0.0</swagger.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.plugin</groupId>
            <artifactId>spring-plugin-core</artifactId>
            <version>2.0.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web-services</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <dependency> 
            <groupId>io.springfox</groupId> 
            <artifactId>springfox-boot-starter</artifactId> 
            <version>${swagger.version}</version> 
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
            <version>2.1.2.RELEASE</version>
        </dependency>
          <dependency>
            <groupId>org.springframework.plugin</groupId>
            <artifactId>spring-plugin-core</artifactId>
            <version>2.0.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.mongodb</groupId>
            <artifactId>mongodb-crypt</artifactId>
            <version>1.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
    
    <profiles>
        <profile>
            <id>openshift</id>
            <build>
                <plugins>
                    <plugin>
                        <groupId>io.fabric8</groupId>
                        <artifactId>fabric8-maven-plugin</artifactId>
                        <version>${version.fabric8-maven-plugin}</version>
                        <executions>
                            <execution>
                                <id>fmp</id>
                                <phase>package</phase>
                                <goals>
                                    <goal>resource</goal>
                                    <goal>build</goal>
                                </goals>
                            </execution>
                        </executions>
                        <configuration>
                            <generator>
                                <config>
                                    <spring-boot>
                                        <fromMode>isTag</fromMode>
                                        <from>redhat-openjdk18-openshift:1.2</from>
                                    </spring-boot>
                                </config>
                            </generator>
                        </configuration>
                    </plugin>
                </plugins>
            </build>
        </profile>
    </profiles>

</project>

** 存储库 **

CodecRegistry pojoCodecRegistry = fromProviders(PojoCodecProvider.builder().automatic(true).build());
        CodecRegistry codecRegistry = fromRegistries(MongoClientSettings.getDefaultCodecRegistry(), pojoCodecRegistry);
        
        MongoClient mongoAux = MongoClients.create(MongoClientSettings.builder()
                .applyConnectionString(new ConnectionString(connectionString))
                .codecRegistry(codecRegistry)
                .build());
        
        return mongoAux;

Answer 1

您面临的问题是 ObjectId 被扩展（反序列化）。我们将其序列化。在 pom 中添加此依赖项

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.11.0.rc1</version>
</dependency>

在主类中添加以下方法。

@Bean
public Jackson2ObjectMapperBuilderCustomizer customizer()
{
    return builder -> builder.serializerByType(ObjectId.class,new ToStringSerializer());
}

这将为您提供预期的输出。