@ComponentScan({ "web", "rest","service" }) 一定要包含 Service 目錄。否則無法實現 @Autowired自動裝配。你可以直接@ComponentScan掃瞄所有目錄。

			
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);
	}

}
			
		

TestService 介面

			
package service;

public interface TestService {

	public String getName();
	public String toString();
	public String helloUser(String user);
}

			
		

實現 TestService 介面

			
package service.impl;

import org.springframework.stereotype.Component;

import service.TestService;

@Component
public class TestServiceImpl implements TestService {

	public String name = "Test";

	public void TestService() {

	}

	@Override
	public String helloUser(String user) {
		return "hello " + user;
	}

	public String getName() {
		return this.name;
	}

	@Override
	public String toString() {
		return "TestServiceImpl [config=" + this.name + "]";
	}

}

			
		

控製器中調用 Service

			
package web;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import domain.City;
import pojo.ApplicationConfiguration;
import repository.CityRepository;
import service.TestService;

@Controller
public class IndexController {
	
	@Autowired
    private TestService testService;
	
	@RequestMapping("/service")
	@ResponseBody
	public String service() {
		return testService.helloUser("Neo");
	}

}
			
		

		
@SpringBootApplication
public class DemoApplication {
    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(DemoApplication.class, args);
        TestService bean = context.getBean(TestService.class);
        bean.test1();
        bean.test2("xsx");
        bean.test3("xsx`", 1);
        bean.test4("xsx2", 1, 2, 3, 4);
    }
}