在我们平时的系统开发中可能会一个接口有多是实现的情况存在，现在有两种实现方式

方式一：

@Autowired 配合 @Qualifier("类别名")一起使用

方式二：

使用@Resource(name = "类别名") 指定类的别名

测试代码

1. 接口

/**
 * 注入测试接口
 * @author: clx
 * @date: 2019/7/23
 * @version: 1.1.0
 */
public interface AutoTestService {
    String getString();
}

2。 实现

实现1

import com.example.javautilsproject.service.AutoTestService;
import org.springframework.stereotype.Service;

/**
 * 注入实现类 1
 * @author: clx
 * @date: 2019/7/23
 * @version: 1.1.0
 */
@Service("autoTestService1")
public class AutoTestService1Impl implements AutoTestService {
    @Override
    public String getString() {
        return "方式[1]调用成功";
    }
}

实现2

import com.example.javautilsproject.service.AutoTestService;
import org.springframework.stereotype.Service;

/**
 * @author: clx
 * @date: 2019/7/23
 * @version: 1.1.0
 */
@Service("autoTestService2")
public class AutoTestService2Impl implements AutoTestService {
    @Override
    public String getString() {
        return "方式[2]调用成功";
    }
}

3. 测试类

import com.example.javautilsproject.service.AutoTestService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

/**
 * @author: clx
 * @date: 2019/7/23
 * @version: 1.1.0
 */
@RestController
public class TestController {

    @Autowired
    @Qualifier("autoTestService1")
    private AutoTestService autoTestService1;

    @Autowired
    @Qualifier("autoTestService2")
    private AutoTestService autoTestService2;

    @Resource(name = "autoTestService1")
    private AutoTestService resourceAutoTestService1;

    @Resource(name = "autoTestService2")
    private AutoTestService resourceAutoTestService2;


    @GetMapping("autoTest")
    public void autoTest() {
        String autowired1 = autoTestService1.getString();
        String autowired2 = autoTestService2.getString();
        String resource1 = resourceAutoTestService1.getString();
        String resource2 = resourceAutoTestService2.getString();
        System.out.println("Qualifier----" + autowired1);
        System.out.println("Qualifier----" + autowired2);
        System.out.println("Resource----" + resource1);
        System.out.println("Resource----" + resource2);
    }
}

4. 测试结构