Spring3之 bean idref?
程序员文章站
2022-05-23 10:19:58
...
很是奇怪idref是干什么的。只是拿另一个的id名?
com.spring305.test.beanInit.cpo.IdrefA.java
public class IdrefA {
private String idrefAStr;
public IdrefA(){
System.out.println(IdrefA.class+"_"+idrefAStr);
}
public String getIdrefAStr() {
return idrefAStr;
}
public void setIdrefAStr(String idrefAStr) {
this.idrefAStr = idrefAStr;
}
}
com.spring305.test.beanInit.cpo.IdrefB.java
public class IdrefB {
private String idrefBStr;
public IdrefB(){
System.out.println(IdrefB.class+"_"+idrefBStr);
}
public String getIdrefBStr() {
return idrefBStr;
}
public void setIdrefBStr(String idrefBStr) {
this.idrefBStr = idrefBStr;
}
public void test(){
System.out.println(idrefBStr);
}
}
com.spring305.test.beanInit.TestIdref.java
@Test
public void InitSingeBean() {
ApplicationContext context = new ClassPathXmlApplicationContext("testIdref.xml");
IdrefB idrefb = (IdrefB) context.getBean("idrefB");
idrefb.test();
IdrefA idrefA = context.getBean(idrefb.getIdrefBStr(),IdrefA.class);
System.out.println(idrefA.getIdrefAStr());
}
src/testIdref.xml
<bean id="idrefAa" class="com.spring305.test.beanInit.cpo.IdrefA"> <property name="idrefAStr"><value>in A class</value></property> </bean> <bean id="idrefB" class="com.spring305.test.beanInit.cpo.IdrefB"> <property name="idrefBStr"> <idref local="idrefAa"/> <!-- <idref bean="idrefAa"/> --> </property> </bean>
神马情况:
打印的结果:
class com.spring305.test.beanInit.cpo.IdrefA_null
class com.spring305.test.beanInit.cpo.IdrefB_null
idrefAa
in A class
前二句是po的构造方法中的,而第三个打印中IdrefA bean的ID...然后第四句是用这个ID拿到对象打印出来的注入的值。
那么这个idref有什么作用?
Using <idref/>
elements when you specify the interceptor names prevents you from misspelling an interceptor id.
为了不误写错interceptor ID?????疑问中。。。待解决。。。