new 出的对象,无法调用@Autowired进入的spring bean

一不小心进了这个坑   记录一下

 

 

@Autowired来的spring 下的bean,则当前类必须也是spring bean才能调用它,不能用new Xxx()来获得对象,这种方式获得的对象无法调用其内的@autowired的bean

1. 类1 加入spring pool	public class PersonServiceImpl implements PersonService{     public void save(){         System.out.println("This is save for test spring");     }     public List<String> findAll(){         List<String> retList = new ArrayList<String>();         for(int i=1;i<10;i++){             retList.add("test"+i);         }         return retList;              } } 加入spring pool <bean id="personServiceImpl" class="com.machome.testtip.impl.PersonServiceImpl" >         </bean>
2.类2 autowired类1, 并且也加入spring pool	public class ProxyPServiceImpl implements ProxyPService {         public void save(){         System.out.print("this is proxy say:");         personService.save();     }     public List<String> findAll(){         System.out.print("this is proxy say:");         return personService.findAll();     }          @Autowired     PersonService personService;     }
3.直接new类2,则执行其方法时出null pointer错误	ProxyPService  proxyPService = new ProxyPServiceImpl(); proxyPService.save(); 执行报错: java.lang.NullPointerException     at com.machome.testtip.impl.ProxyPServiceImpl.save(ProxyPServiceImpl.java:18)     at com.machome.testtip.TestSpring2.testSave(TestSpring2.java:34)     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
4.解决:用spring 方式获取类2的bean,再执行其方法,没问题	ProxyPService  proxyPService = null; try {                 String[] confFile = {"spring.xml"};                 ctx = new ClassPathXmlApplicationContext(confFile);                 proxyPService = (ProxyPService)ctx.getBean("ProxyPServiceImpl");             } catch (Exception e) {                 e.printStackTrace();             } proxyPService.save(); 执行: this is proxy say:This is save for test spring