new出来的对象无法调用@Autowired注入的Spring Bean

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>

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;}

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)

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