//dao.java 文件名(下同)

package justspring.dao;

public interface Dao {
	String sayHello();
}

//daoImpl.java

package justspring.dao;

public class DaoImpl implements Dao {
    @Override
    public String sayHello() {
        return "hello by dao";
    }
}

//service.java 

package justspring.service;

public interface Service {
    String sayHello();
    String otherService();
}

//serviceImpl.java

package justspring.service;

import justspring.dao.Dao;

public class ServiceImpl implements Service {
    private Dao dao;
    public void setDao(Dao dao) {
        this.dao = dao;
    }
    @Override
    public String sayHello() {
        return dao.sayHello();
    }
    @Override
    public String otherService() {
        return "other service";
    }
}

import justspring.service.Service;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class testJustSpring {

    @Test
    public void test() {
		//引入spring的配置文件获取上下文
        ApplicationContext context = new ClassPathXmlApplicationContext("spring1.xml");
		//通过上下文和bean的名字获取service实例，就是刚才在配置文件下配置的第二个
		//其实这里也可以通过依赖注入来实现，不过需要写setter代码不太好看        
		Service service = (Service) context.getBean("service");
        String string = service.sayHello();
        System.out.println(string);
    }
}

//DaoImpl.java

package justspring.dao;

import org.springframework.stereotype.Repository;

@Repository("dao") //添加了这行代码
public class DaoImpl implements Dao {
    @Override
    public String sayHello() {
        return "hello by dao";
    }
}

//ServiceImpl.java

package justspring.service;

import justspring.dao.Dao;
import javax.annotation.Resource;

//因为这个工程里有Service类，为了不发生歧义，使用包名+类名
@org.springframework.stereotype.Service("service")
public class ServiceImpl implements Service {

    @Resource //添加了这个注释，将上面的dao注入到这里
    private Dao dao;

    @Override
    public String sayHello() {
        return dao.sayHello();
    }

    @Override
    public String otherService() {
        return "other service";
    }
}

//Dao.java

package justspring.dao;

import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

@Repository //没有实现类DaoImpl，所以将这个注解放在了这里
public interface Dao {
//    @Select("SELECT LOG_PW FROM person WHERE LOG_NM = #{name}")
//通过@Select注释也可以不用写xml直接进行数据库操作，但是在比较复杂的查询情况下还是需要xml的（官方的说法），所以这里还是使用xml的方法
    String getPwByUserNm(@Param("name")String name);
//@Param是一个注解，表示传进去的参数名字，在xml当中通过@Param括号里面的名字，可以获取到传进去的参数
}

//Service.java

package justspring.service;

public interface Service {
    String getPwByUserNm(String name);
}

//ServciceImpl.java

package justspring.service;

import justspring.dao.Dao;
import org.apache.ibatis.annotations.Param;

import javax.annotation.Resource;

@org.springframework.stereotype.Service("service")
public class ServiceImpl implements Service {

	//同上，注入一个dao
    @Resource
    private Dao dao;

	//实现通过用户名获取密码的服务
    @Override
    public String getPwByUserNm(String name) {
        return this.dao.getPwByUserNm(name);
    }
}

//testJustSpring.java

package justspring.test;

import justspring.service.Service;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import javax.annotation.Resource;

public class testJustSpring {

    @Test
    public void test() {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring1.xml");
        Service service = (Service) context.getBean("service");
        String name = "管理员0";
        String password = service.getPwByUserNm(name);
        System.out.println(password);
    }
}