在本文中，我们将向您展示如何使用Gradle构建工具创建Spring Boot + Spring Data MongoDB应用程序。
- Spring Boot 1.5.1。发布
- MongoDB
- 摇篮
- Java 8
1.项目结构
标准项目结构。
2.项目依赖性
2.1 Gradle构建文件。
build.gradle
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:1.5.1.RELEASE")
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'org.springframework.boot'
jar {
baseName = 'spring-data-mongodb-example'
version = '1.0'
}
repositories {
mavenCentral()
}
sourceCompatibility = 1.8
targetCompatibility = 1.8
dependencies {
compile 'org.springframework.boot:spring-boot-starter-data-mongodb'
} 2.2声明一个spring-boot-starter-data-mongodb ，它捕获了大量的库，请检查以下依赖项：
Console
$ gradle dependencies --configuration runtime
:dependencies
------------------------------------------------------------
Root project
------------------------------------------------------------
runtime - Runtime classpath for source set 'main'.
\--- org.springframework.boot:spring-boot-starter-data-mongodb: -> 1.5.1.RELEASE
+--- org.springframework.boot:spring-boot-starter:1.5.1.RELEASE
| +--- org.springframework.boot:spring-boot:1.5.1.RELEASE
| | +--- org.springframework:spring-core:4.3.6.RELEASE
| | \--- org.springframework:spring-context:4.3.6.RELEASE
| | +--- org.springframework:spring-aop:4.3.6.RELEASE
| | | +--- org.springframework:spring-beans:4.3.6.RELEASE
| | | | \--- org.springframework:spring-core:4.3.6.RELEASE
| | | \--- org.springframework:spring-core:4.3.6.RELEASE
| | +--- org.springframework:spring-beans:4.3.6.RELEASE (*)
| | +--- org.springframework:spring-core:4.3.6.RELEASE
| | \--- org.springframework:spring-expression:4.3.6.RELEASE
| | \--- org.springframework:spring-core:4.3.6.RELEASE
| +--- org.springframework.boot:spring-boot-autoconfigure:1.5.1.RELEASE
| | \--- org.springframework.boot:spring-boot:1.5.1.RELEASE (*)
| +--- org.springframework.boot:spring-boot-starter-logging:1.5.1.RELEASE
| | +--- ch.qos.logback:logback-classic:1.1.9
| | | +--- ch.qos.logback:logback-core:1.1.9
| | | \--- org.slf4j:slf4j-api:1.7.22
| | +--- org.slf4j:jcl-over-slf4j:1.7.22
| | | \--- org.slf4j:slf4j-api:1.7.22
| | +--- org.slf4j:jul-to-slf4j:1.7.22
| | | \--- org.slf4j:slf4j-api:1.7.22
| | \--- org.slf4j:log4j-over-slf4j:1.7.22
| | \--- org.slf4j:slf4j-api:1.7.22
| +--- org.springframework:spring-core:4.3.6.RELEASE
| \--- org.yaml:snakeyaml:1.17
+--- org.mongodb:mongodb-driver:3.4.1
| +--- org.mongodb:mongodb-driver-core:3.4.1
| | \--- org.mongodb:bson:3.4.1
| \--- org.mongodb:bson:3.4.1
\--- org.springframework.data:spring-data-mongodb:1.10.0.RELEASE
+--- org.springframework:spring-tx:4.3.6.RELEASE
| +--- org.springframework:spring-beans:4.3.6.RELEASE (*)
| \--- org.springframework:spring-core:4.3.6.RELEASE
+--- org.springframework:spring-context:4.3.6.RELEASE (*)
+--- org.springframework:spring-beans:4.3.6.RELEASE (*)
+--- org.springframework:spring-core:4.3.6.RELEASE
+--- org.springframework:spring-expression:4.3.6.RELEASE (*)
+--- org.springframework.data:spring-data-commons:1.13.0.RELEASE
| +--- org.springframework:spring-core:4.3.6.RELEASE
| +--- org.springframework:spring-beans:4.3.6.RELEASE (*)
| +--- org.slf4j:slf4j-api:1.7.22
| \--- org.slf4j:jcl-over-slf4j:1.7.22 (*)
+--- org.slf4j:slf4j-api:1.7.22
\--- org.slf4j:jcl-over-slf4j:1.7.22 (*)3. MongoDB配置
application.properties
#mongodb
spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=app1
#logging
logging.level.org.springframework.data=debug
logging.level.=error4. Spring数据– MongoRepository
4.1一个带有Spring数据注释的简单模型。
Domain.java
package com.mkyong.domain;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.index.Indexed;
import org.springframework.data.mongodb.core.mapping.Document;
@Document(collection = "domain")
public class Domain {
@Id
private long id;
@Indexed(unique = true)
private String domain;
private boolean displayAds;
//getters and setters
} 4.2扩展MongoRepository ，您将自动具有CRUD功能。 Spring数据带有许多不可思议的findBy查询。有关详细信息，请查看Spring官方数据MongoDB –查询方法 。
DomainRepository.java
package com.mkyong.domain;
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.mongodb.repository.Query;
import java.util.List;
// No need implementation, just one interface, and you have CRUD, thanks Spring Data
public interface DomainRepository extends MongoRepository {
Domain findFirstByDomain(String domain);
Domain findByDomainAndDisplayAds(String domain, boolean displayAds);
//Supports native JSON query string
@Query("{domain:'?0'}")
Domain findCustomByDomain(String domain);
@Query("{domain: { $regex: ?0 } })")
List findCustomByRegExDomain(String domain);
} 4.3要为DomainRepository创建自定义方法，您需要在另一个文件中创建实现，并使DomainRepository扩展。
以下示例向MongoRepository添加了自定义“更新特定字段”方法
4.3.1自定义界面
DomainRepositoryCustom.java
package com.mkyong.domain;
public interface DomainRepositoryCustom {
int updateDomain(String domain, boolean displayAds);
} 4.3.2实现类的名称非常严格，名称必须为"CoreRepositoryInterface" + Impl ，读取此Spring数据MongoDB Custom实现
DomainRepositoryCustom.java
package com.mkyong.domain;
import com.mongodb.WriteResult;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.core.query.Update;
//Impl postfix of the name on it compared to the core repository interface
public class DomainRepositoryImpl implements DomainRepositoryCustom {
@Autowired
MongoTemplate mongoTemplate;
@Override
public int updateDomain(String domain, boolean displayAds) {
Query query = new Query(Criteria.where("domain").is(domain));
Update update = new Update();
update.set("displayAds", displayAds);
WriteResult result = mongoTemplate.updateFirst(query, update, Domain.class);
if(result!=null)
return result.getN();
else
return 0;
}
} 4.3.3 DomainRepository扩展了自定义接口DomainRepositoryCustom
DomainRepository.java
package com.mkyong.domain;
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.mongodb.repository.Query;
import java.util.List;
public interface DomainRepository extends MongoRepository, DomainRepositoryCustom {
//other methods
} 5.运行
5.1 Spring Boot应用程序
Application.java
package com.mkyong;
import com.mkyong.domain.Domain;
import com.mkyong.domain.DomainRepository;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
@Bean
CommandLineRunner init(DomainRepository domainRepository) {
return args -> {
Domain obj = domainRepository.findOne(7L);
System.out.println(obj);
Domain obj2 = domainRepository.findFirstByDomain("mkyong.com");
System.out.println(obj2);
int n = domainRepository.updateDomain("mkyong.com", true);
System.out.println("Number of records updated : " + n);
};
}
}5.2 Gradle构建并运行它。
Terminal
$ gradle build
$ java -jar build/libs/spring-data-mongodb-example-1.0.jar
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.1.RELEASE)
//blah blah blah6.常见问题
6.1如何创建自定义的MongoTemple ？
答：声明一个新的MongoTemplate bean来覆盖默认值。 在下面的示例中，它创建了一个自定义MongoTemplate来删除_class字段。
Application.java
package com.mkyong;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.data.mongodb.MongoDbFactory;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.convert.DefaultDbRefResolver;
import org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper;
import org.springframework.data.mongodb.core.convert.MappingMongoConverter;
import org.springframework.data.mongodb.core.mapping.MongoMappingContext;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
//remove _class
@Bean
public MongoTemplate mongoTemplate(MongoDbFactory mongoDbFactory,
MongoMappingContext context) {
MappingMongoConverter converter =
new MappingMongoConverter(new DefaultDbRefResolver(mongoDbFactory), context);
converter.setTypeMapper(new DefaultMongoTypeMapper(null));
MongoTemplate mongoTemplate = new MongoTemplate(mongoDbFactory, converter);
return mongoTemplate;
}
}下载源代码
下载– spring-boot-data-mongodb-example.zip （7 KB）
参考文献
- Spring Data MongoDB –参考文档
- 使用NoSQL技术
- Spring Boot Gradle插件
- 使用Spring Boot构建应用程序
- Gradle –显示项目依赖性
标签： gradle这个 mongodb的 春天开机 弹簧数据
翻译自: https://mkyong.com/spring-boot/spring-boot-spring-data-mongodb-example/