1. Project construction
add pom file
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
2. Add configuration in application.properties
##start mongodb for basic
#----------------------------------------------
basic.spring.data.mongodb.host=localhost
basic.spring.data.mongodb.port=27016
basic.spring.data.mongodb.username=auto_compute
basic.spring.data.mongodb.password=vqOqSZRs
basic.spring.data.mongodb.database=auto_compute
#----------------------------------------------
##end mongodb for spirit
##start mongodb for auth
#----------------------------------------------
auth.spring.data.mongodb.host=localhost
auth.spring.data.mongodb.port=27016
auth.spring.data.mongodb.username=datacenter
auth.spring.data.mongodb.password=Bds6NadsfafGlV
auth.spring.data.mongodb.database=datacenter
#----------------------------------------------
##end mongodb for spirit
3. Configure the corresponding data source.
Use mongoTemplate to perform mongo-related operations and write a basic abstract class
import com.mongodb.MongoClient;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;
import lombok.Getter;
import lombok.Setter;
import org.springframework.data.mongodb.MongoDbFactory;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.SimpleMongoDbFactory;
import java.util.ArrayList;
import java.util.List;
@Getter
@Setter
public abstract class AbstractMongoConfigure {
private String host;
private int port;
private String username;
private String password;
private String database;
public MongoDbFactory mongoDbFactory() throws Exception {
/*// 无认证的初始化方法
return new SimpleMongoDbFactory(new MongoClient(host, port), database);*/
//有认证的初始化方法
ServerAddress serverAddress = new ServerAddress(host, port);
List<MongoCredential> mongoCredentialList = new ArrayList<>();
MongoCredential mongoCredential = MongoCredential.createCredential(username, database, password.toCharArray());
mongoCredentialList.add(mongoCredential);
return new SimpleMongoDbFactory(new MongoClient(serverAddress, mongoCredentialList), database);
}
abstract public MongoTemplate getMongoTemplate() throws Exception;
}
Data source loading needs to inherit the AbstractMongoConfigure abstract class. As many data sources as there are, you need to create as many new data source loading classes.
3.1, the first data source
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.repository.config.EnableMongoRepositories;
@Configuration
@EnableMongoRepositories(basePackages = {"com.tcl.dc.autodata.dao.base"}, mongoTemplateRef = "mongoTemplate")
@ConfigurationProperties(prefix = "basic.spring.data.mongodb")
public class BasicMongoConfig extends AbstractMongoConfigure {
@Primary
@Bean(name = "mongoTemplate")
@Override
public MongoTemplate getMongoTemplate() throws Exception {
return new MongoTemplate(mongoDbFactory());
}
}
The value of basePackages is used for the corresponding base package, and prefix is the configuration value in application.properties
3.2, the second data source
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.repository.config.EnableMongoRepositories;
@Configuration
@EnableMongoRepositories(basePackages = {"com.tcl.dc.autodata.dao.auth"}, mongoTemplateRef = "authMongoTemplate")
@ConfigurationProperties(prefix = "auth.spring.data.mongodb")
public class BasicMongoConfig extends AbstractMongoConfigure {
@Bean(name = "authMongoTemplate")
@Override
public MongoTemplate getMongoTemplate() throws Exception {
return new MongoTemplate(mongoDbFactory());
}
}
4. Note
1. One bean in multiple data sources needs to be set to mongoTemplate, and @Primary annotation must be added, otherwise WebMvcConfigurationSupport.class will report an error that mongoTemplate cannot be found
2. Spring Boot will automatically inject mongoTemplate, which conflicts with the multiple data sources we configured. To prevent default injection, you need to exclude automatically injected classes. Add the exclusion class annotation to the Applocation.java startup class of Spring Boot
@SpringBootApplication(exclude = {
MongoAutoConfiguration.class,
MongoDataAutoConfiguration.class})
5. When using multiple data sources
, directly correspond to the injection
@Autowired
@Qualifier(value = "mongoTemplate")
MongoTemplate mongoTemplate;
@Autowired
@Qualifier(value = "authMongoTemplate")
MongoTemplate authMongoTemplate;
6. Problems that may be encountered1.'com.mongodb.MongoClient
' that could not be found The
detailed error is reported as follows:
***************************
APPLICATION FAILED TO START
***************************
Description:
Parameter 0 of method mongoDbFactory in org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration required a bean of type 'com.mongodb.MongoClient' that could not be found.
- Bean method 'mongo' not loaded because auto-configuration 'MongoAutoConfiguration' was excluded
Action:
Consider revisiting the conditions above or defining a bean of type 'com.mongodb.MongoClient' in your configuration.
Reason: after rewriting MongoClient, etc., the original automatic injection lacks beans
Solution: It mainly depends on which automatically injected class refers to the default MongoClient, and it can be excluded, for example:
@SpringBootApplication(exclude = {
MongoAutoConfiguration.class,
MongoDataAutoConfiguration.class})
2. More than one'primary' bean found among candidates The
detailed error is as follows:
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sampleController': Unsatisfied dependency expressed through field 'mongoTemplate'; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'org.springframework.data.mongodb.core.MongoTemplate' available: more than one 'primary' bean found among candidates: [logMongoTemplate, userMongoTemplate, mongoTemplate]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) ~[spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) ~[spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
at com.biologic.Applocation.main(Applocation.java:18) [classes/:na]
Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'org.springframework.data.mongodb.core.MongoTemplate' available: more than one 'primary' bean found among candidates: [logMongoTemplate, userMongoTemplate, mongoTemplate]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.determinePrimaryCandidate(DefaultListableBeanFactory.java:1365) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.determineAutowireCandidate(DefaultListableBeanFactory.java:1326) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1113) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ~[spring-beans-4.3.7.RELEASE.jar:4.3.7.RELEASE]
Reason: Spring Boot will automatically inject a default mongoTemplate or set multiple @Primary data sources
Solution: Exclude the classes automatically injected by Spring Boot, the automatically rewritten mongoTemplate needs and only one can be set as @Primary