MongoDb 自动创建索引

spring-data-mongodb 3.0后默认不会自动创建索引

有三种方式可以解决：

首先对应的实体类上面需要有Document注解

1、修改配置（推荐，简单）

properties:

spring.data.mongodb.auto-index-creation=true

yaml:

1.  
   spring:
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   data:
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   mognodb:
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   auto-index-creation: true

 2、继承AbstractMongoClientConfiguration

修改代码中your_开头的属性，改为自己的mongodb连接配置

1.  
    
2.  
   import com.mongodb.MongoClientSettings;
3.  
   import com.mongodb.MongoCredential;
4.  
   import com.mongodb.ServerAddress;
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   import com.mongodb.client.MongoClient;
6.  
   import com.mongodb.client.MongoClients;
7.  
   import org.springframework.context.annotation.Configuration;
8.  
   import org.springframework.data.mongodb.config.AbstractMongoClientConfiguration;
9.  
    
10.  
    import java.util.Arrays;
11.  
    @Configuration
12.  
    public class MongoDBDataSourceConfig extends AbstractMongoClientConfiguration {
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    @Override
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    public MongoClient mongoClient() {
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    MongoClient mongoClient = MongoClients.create(
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    MongoClientSettings.builder()
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    .applyToClusterSettings(builder ->builder.hosts(Arrays.asList(new ServerAddress(your_host, your_port))))
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    // 凭据
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    .credential(MongoCredential.createCredential(your_username, your_dbname,your_password.toCharArray()))
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    .build());
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    return mongoClient;
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    }
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    @Override
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    protected String getDatabaseName() {
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    return your_dbname;
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    }
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    @Override
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    protected boolean autoIndexCreation() {
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    return true;
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    }
31.  
    }

3、手动获取索引执行

1.  
   import lombok.RequiredArgsConstructor;
2.  
   import lombok.extern.slf4j.Slf4j;
3.  
   import org.springframework.boot.context.event.ApplicationReadyEvent;
4.  
   import org.springframework.context.annotation.Configuration;
5.  
   import org.springframework.context.event.EventListener;
6.  
   import org.springframework.data.mapping.context.MappingContext;
7.  
   import org.springframework.data.mongodb.core.MongoTemplate;
8.  
   import org.springframework.data.mongodb.core.convert.MongoConverter;
9.  
   import org.springframework.data.mongodb.core.index.IndexOperations;
10.  
    import org.springframework.data.mongodb.core.index.MongoPersistentEntityIndexResolver;
11.  
    import org.springframework.data.mongodb.core.mapping.BasicMongoPersistentEntity;
12.  
    import org.springframework.data.mongodb.core.mapping.Document;
13.  
    import org.springframework.data.mongodb.core.mapping.MongoMappingContext;
14.  
     
15.  
     
16.  
    @Slf4j
17.  
    @RequiredArgsConstructor
18.  
    @Configuration
19.  
    public class MongoConfiguration {
20.  
    private final MongoTemplate mongoTemplate;
21.  
    private final MongoConverter mongoConverter;
22.  
    @EventListener(ApplicationReadyEvent.class)
23.  
    public void initIndicesAfterStartup() {
24.  
    LOGGER.info("Mongo InitIndicesAfterStartup init");
25.  
    long init = System.currentTimeMillis();
26.  
    MappingContext mappingContext = this.mongoConverter.getMappingContext();
27.  
    if (mappingContext instanceof MongoMappingContext) {
28.  
    MongoMappingContext mongoMappingContext = (MongoMappingContext) mappingContext;
29.  
    for (BasicMongoPersistentEntity<?> persistentEntity : mongoMappingContext.getPersistentEntities()) {
30.  
    Class clazz = persistentEntity.getType();
31.  
    if (clazz.isAnnotationPresent(Document.class)) {
32.  
    MongoPersistentEntityIndexResolver resolver = new MongoPersistentEntityIndexResolver(mongoMappingContext);
33.  
    IndexOperations indexOps = mongoTemplate.indexOps(clazz);
34.  
    resolver.resolveIndexFor(clazz).forEach(indexOps::ensureIndex);
35.  
    }
36.  
    }
37.  
    }
38.  
    LOGGER.info("Mongo InitIndicesAfterStartup take: {}", (System.currentTimeMillis() - init));
39.  
    }
40.  
    }

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