@ComponentScan({ "web", "rest","service" }) 一定要包含 Service 目录。否则无法实现 @Autowired自动装配。你可以直接@ComponentScan扫描所有目录。

			
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.authentication.UserCredentials;
import org.springframework.data.mongodb.MongoDbFactory;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.SimpleMongoDbFactory;
import org.springframework.data.mongodb.repository.config.EnableMongoRepositories;

import com.mongodb.Mongo;

import pojo.ApplicationConfiguration;

@Configuration
@SpringBootApplication
@EnableConfigurationProperties(ApplicationConfiguration.class)
@EnableAutoConfiguration(exclude = { DataSourceAutoConfiguration.class })
@ComponentScan({ "web", "rest","service" })
@EnableMongoRepositories
public class Application {
	
	@SuppressWarnings("deprecation")
	public @Bean MongoDbFactory mongoDbFactory() throws Exception {
		UserCredentials userCredentials = new UserCredentials("finance", "your_password");
		return new SimpleMongoDbFactory(new Mongo("mdb.netkiller.cn"), "finance", userCredentials);
	}

	public @Bean MongoTemplate mongoTemplate() throws Exception {
		return new MongoTemplate(mongoDbFactory());
	}

	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}

}