<dependencies>
  <dependency> 
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
  </dependency> 
</dependencies>

spring.data.mongodb.uri=mongodb://name:pass@localhost:27017/test

spring.data.mongodb.uri=mongodb://user:pwd@ip1:port1,ip2:port2/database

public class UserEntity implements Serializable {
  private static final long serialVersionUID = -3258839839160856613L;
  private Long id;
  private String userName;
  private String passWord;
  //getter、setter省略
}

@Component
public class UserDaoImpl implements UserDao {
 @Autowired
 private MongoTemplate mongoTemplate;
 /**
  * 创建对象
  * @param user
  */
 @Override
 public void saveUser(UserEntity user) {
  mongoTemplate.save(user);
 }
 /**
  * 根据用户名查询对象
  * @param userName
  * @return
  */
 @Override
 public UserEntity findUserByUserName(String userName) {
  Query query=new Query(Criteria.where("userName").is(userName));
  UserEntity user = mongoTemplate.findOne(query , UserEntity.class);
  return user;
 }
 /**
  * 更新对象
  * @param user
  */
 @Override
 public void updateUser(UserEntity user) {
  Query query=new Query(Criteria.where("id").is(user.getId()));
  Update update= new Update().set("userName", user.getUserName()).set("passWord", user.getPassWord());
  //更新查询返回结果集的第一条
  mongoTemplate.updateFirst(query,update,UserEntity.class);
  //更新查询返回结果集的所有
  // mongoTemplate.updateMulti(query,update,UserEntity.class);
 }
 /**
  * 删除对象
  * @param id
  */
 @Override
 public void deleteUserById(Long id) {
  Query query=new Query(Criteria.where("id").is(id));
  mongoTemplate.remove(query,UserEntity.class);
 }
}

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserDaoTest {
 @Autowired
 private UserDao userDao;
 @Test
 public void testSaveUser() throws Exception {
  UserEntity user=new UserEntity();
  user.setId(2l);
  user.setUserName("小明");
  user.setPassWord("fffooo123");
  userDao.saveUser(user);
 }
 @Test
 public void findUserByUserName(){
  UserEntity user= userDao.findUserByUserName("小明");
  System.out.println("user is "+user);
 }
 @Test
 public void updateUser(){
  UserEntity user=new UserEntity();
  user.setId(2l);
  user.setUserName("天空");
  user.setPassWord("fffxxxx");
  userDao.updateUser(user);
 }
 @Test
 public void deleteUserById(){
  userDao.deleteUserById(1l);
 }
}

bin/mongo -host localhost -port 20000

use test

db.userEntity.find()

<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
<dependency>
 <groupId>org.projectlombok</groupId>
 <artifactId>lombok</artifactId>
</dependency>
<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-autoconfigure</artifactId>
 <version>RELEASE</version>
</dependency>

spring-boot-autoconfigure - 就是spring boot的自动化配置

mongodb:
 primary:
 host: 192.168.9.60
 port: 20000
 database: test
 secondary:
 host: 192.168.9.60
 port: 20000
 database: test1

@Data
@ConfigurationProperties(prefix = "mongodb")
public class MultipleMongoProperties {
 private MongoProperties primary = new MongoProperties();
 private MongoProperties secondary = new MongoProperties();
}

@Configuration
@EnableMongoRepositories(basePackages = "com.neo.model.repository.primary",
  mongoTemplateRef = PrimaryMongoConfig.MONGO_TEMPLATE)
public class PrimaryMongoConfig {
 protected static final String MONGO_TEMPLATE = "primaryMongoTemplate";
}

@Configuration
@EnableMongoRepositories(basePackages = "com.neo.model.repository.secondary",
  mongoTemplateRef = SecondaryMongoConfig.MONGO_TEMPLATE)
public class SecondaryMongoConfig {
 protected static final String MONGO_TEMPLATE = "secondaryMongoTemplate";
}

@Configuration
public class MultipleMongoConfig {
 @Autowired
 private MultipleMongoProperties mongoProperties;
 @Primary
 @Bean(name = PrimaryMongoConfig.MONGO_TEMPLATE)
 public MongoTemplate primaryMongoTemplate() throws Exception {
  return new MongoTemplate(primaryFactory(this.mongoProperties.getPrimary()));
 }
 @Bean
 @Qualifier(SecondaryMongoConfig.MONGO_TEMPLATE)
 public MongoTemplate secondaryMongoTemplate() throws Exception {
  return new MongoTemplate(secondaryFactory(this.mongoProperties.getSecondary()));
 }
 @Bean
 @Primary
 public MongoDbFactory primaryFactory(MongoProperties mongo) throws Exception {
  return new SimpleMongoDbFactory(new MongoClient(mongo.getHost(), mongo.getPort()),
    mongo.getDatabase());
 }
 @Bean
 public MongoDbFactory secondaryFactory(MongoProperties mongo) throws Exception {
  return new SimpleMongoDbFactory(new MongoClient(mongo.getHost(), mongo.getPort()),
    mongo.getDatabase());
 }
}

@Data
@AllArgsConstructor
@NoArgsConstructor
@Document(collection = "first_mongo")
public class PrimaryMongoObject {
 @Id
 private String id;
 private String value;
 @Override
 public String toString() {
  return "PrimaryMongoObject{" + "id='" + id + '\'' + ", value='" + value + '\''
    + '}';
 }
}

public interface PrimaryRepository extends MongoRepository<PrimaryMongoObject, String> {
}

@RunWith(SpringRunner.class)
@SpringBootTest
public class MuliDatabaseTest {
 @Autowired
 private PrimaryRepository primaryRepository;
 @Autowired
 private SecondaryRepository secondaryRepository;
 @Test
 public void TestSave() {
  System.out.println("************************************************************");
  System.out.println("测试开始");
  System.out.println("************************************************************");
  this.primaryRepository
    .save(new PrimaryMongoObject(null, "第一个库的对象"));
  this.secondaryRepository
    .save(new SecondaryMongoObject(null, "第二个库的对象"));
  List<PrimaryMongoObject> primaries = this.primaryRepository.findAll();
  for (PrimaryMongoObject primary : primaries) {
   System.out.println(primary.toString());
  }
  List<SecondaryMongoObject> secondaries = this.secondaryRepository.findAll();
  for (SecondaryMongoObject secondary : secondaries) {
   System.out.println(secondary.toString());
  }
  System.out.println("************************************************************");
  System.out.println("测试完成");
  System.out.println("************************************************************");
 }
}