2021-11-11

2021-11-11 @Autowired注解在集合中的使用

• 创建com.it.wjn_AnnotionAuto2包
• 在这个包中创建User类
  public class User {
  String name;
  Integer age;
  String gender;
  public User() {
  super();
  // TODO Auto-generated constructor stub
  }
  public User(String name, Integer age, String gender) {
  super();
  this.name = name;
  this.age = age;
  this.gender = gender;
  }

}

• 在包中创建basePrint接口
  public interface basePrint {
  void print(User user);
  }
• 在包中分别创建NamePrint AgePrint GenderPrint类

@Service
public class NamePrint implements basePrint{

@Override
public void print(User user) {
	// TODO Auto-generated method stub
	System.out.println(user.name);
}

}

@Service
public class AgePrint implements basePrint{

@Override
public void print(User user) {
	// TODO Auto-generated method stub
	System.out.println(user.age);
}

}

@Service
public class GenderPrint implements basePrint{

@Override
public void print(User user) {
	// TODO Auto-generated method stub
	System.out.println(user.gender);
}

}

• 在包中创建print类
  @Service
  public class print {

        @Autowired
       private List  printList;
        
        
        @Autowired
        private Map printMap;
  
           public void PrintList(){
           	       User user = new User("tom", 21, "man");
           	       for (basePrint printService : printList) {
   				   	       printService.print(user);
   				}
           }
        
  
           public void PrintMap(){
           	     User user = new User("jam", 22, "man");
           	    for (String  beanName : printMap.keySet()) {
   					      System.out.println("key值beanName="+beanName);
   					      printMap.get(beanName).print(user);
   				}
           	    
           	       
           }
  

}

• 在包中创建beans.xml文件
  添加约束

7 编写测试类
public class test {
public static void main(String[] args) {
String xmlPath=“com/it/wjn_AnnotionAuto2/beans.xml”;
ClassPathXmlApplicationContext classPathXmlApplicationContext = new ClassPathXmlApplicationContext(xmlPath);
print bean = (print)classPathXmlApplicationContext.getBean(“print”);

                                     bean.PrintList();
                                     bean.PrintMap();

}

}