javaEEday05-分层解耦-IOC&DI-DI详解

springboot-web-req-resp/src/main/java/com/inmind/controller/EmpController.java

@@ -5,7 +5,9 @@ import com.inmind.pojo.Result;
 import com.inmind.service.EmpService;
 import com.inmind.service.impl.EmpServiceA;
 import com.inmind.utils.XmlParserUtils;
+import jakarta.annotation.Resource;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.stereotype.Component;
 import org.springframework.stereotype.Service;
 import org.springframework.web.bind.annotation.RequestMapping;
@@ -18,6 +20,8 @@ public class EmpController {
 
     //定义业务层对象
     @Autowired //运行时,IOC容器会提供该类型的bean对象,并赋值给该变量---依赖注入
+    @Qualifier("empServiceB")  //方式二：解决同一类型，有多个bean对象
+    //@Resource(name = "empServiceA")   方式三：解决同一类型，有多个bean对象
     private EmpService empService;//多态
 
     //定义一个获取员工列表的接口

springboot-web-req-resp/src/main/java/com/inmind/service/impl/EmpServiceA.java

@@ -4,9 +4,12 @@ import com.inmind.dao.EmpDao;
 import com.inmind.pojo.Emp;
 import com.inmind.service.EmpService;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Primary;
+import org.springframework.stereotype.Service;
 
 import java.util.List;
-
+//@Primary 方式一：解决同一类型，有多个bean对象
+@Service
 public class EmpServiceA implements EmpService {
     //获取dao层的对象，获取数据
     @Autowired