@Autowired注解注入map、list与@Qualifier

ゝ一世哀愁。 2022-02-15 06:17 511阅读 0赞

package com.imooc.beanannotation.multibean;

public interface BeanInterface \{

\}  
  
package com.imooc.beanannotation.multibean;

import org.springframework.core.annotation.Order;  
import org.springframework.stereotype.Component;

@Order(2)  
@Component  
public class BeanImplOne implements BeanInterface \{

\}  
  
package com.imooc.beanannotation.multibean;

import org.springframework.core.annotation.Order;  
import org.springframework.stereotype.Component;

@Order(1)  
@Component  
public class BeanImplTwo implements BeanInterface \{

\}  
  
package com.imooc.beanannotation.multibean;

import java.util.List;  
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;  
import org.springframework.beans.factory.annotation.Qualifier;  
import org.springframework.stereotype.Component;

@Component  
public class BeanInvoker \{

@Autowired  
    private List<BeanInterface> list;

@Autowired  
    private Map<String, BeanInterface> map;

@Autowired  
    @Qualifier("beanImplTwo")  
    private BeanInterface beanInterface;

public void say() \{  
        if (null != list && 0 != list.size()) \{  
            System.out.println("list...");  
            for (BeanInterface bean : list) \{  
                System.out.println(bean.getClass().getName());  
            \}  
        \} else \{  
            System.out.println("List<BeanInterface> list is null !!!!!!!!!!");  
        \}

System.out.println();

if (null != map && 0 != map.size()) \{  
            System.out.println("map...");  
            for (Map.Entry<String, BeanInterface> entry : map.entrySet()) \{  
                System.out.println(entry.getKey() + "      " + entry.getValue().getClass().getName());  
            \}  
        \} else \{  
            System.out.println("Map<String, BeanInterface> map is null !!!!!!!!!!");  
        \}

System.out.println();  
        if (null != beanInterface) \{  
            System.out.println(beanInterface.getClass().getName());  
        \} else \{  
            System.out.println("beanInterface is null...");  
        \}

\}  
  
@order 注解可以调整注入顺序，但只对list有效，对map无效。   
对于向map中注入，bean注入后string为该bean的id。

@Autowired  
    @Qualifier("beanImplTwo")  
    private BeanInterface beanInterface;

@Qualifier可以缩小范围，指定注入对象的id   
@request：这个属性/方法必须复制，相当于@Autowired（request=true）  
\---------------------   
原文：https://blog.csdn.net/ethunsex/article/details/66475792