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小弟刚学 spring 有点小问题??请前辈指教..

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小弟刚学 spring 有点小问题??请前辈指教..[已结贴,结贴人:]

发表于：2007-07-17 15:14:55 楼主

public class hellobean {
private string helloword = "helloword!! ";
private applicationcontext applicationcontext;

public void sethelloword（string helloword){
this.helloword = helloword;
}
public string gethelloword（){
27行: applicationcontext.publishevent（new propertygettedevent （ "[ "+helloword+ "] is getted "));

return helloword;
}
public void setapplicationcontext（applicationcontext context){
this.applicationcontext = context;
}
}

public class propertygettedevent extends applicationevent {
public propertygettedevent（object source){
super（source);;
}
}

public class propertygettedlistener implements applicationlistener {
public void onapplicationevent（applicationevent event) {
system.out.println（event.getsource（).tostring（));
}
}

public class springtest {

public static void main（string[] args){
applicationcontext context = new classpathxmlapplicationcontext（ "bean.xml ");

hellobean hello = （hellobean)context.getbean（ "hellobean ");
35行: system.out.println（hello.gethelloword（));

}

}

<beans>
<bean id= "propertygettedlistener " class= "com.dl.bean.propertygettedlistener "/>
<bean id= "hellobean " class= "com.dl.bean.hellobean ">
<property name= "helloword ">
<value> helloword!! </value>
</property>
</bean>
</beans>

报这个异常空指针就是搞不懂
java.lang.nullpointerexception
at com.dl.bean.hellobean.gethelloword（hellobean.java:27)
at com.dl.test.springtest.main（springtest.java:35)
exception in thread "main "

发表于：2007-07-17 17:18:051楼得分:0

applicationcontext为空
这样改改：
public static void main（string[] args){
applicationcontext context = new classpathxmlapplicationcontext（ "bean.xml ");

hellobean hello = （hellobean)context.getbean（ "hellobean ");
hello.setapplication（context);
35行: system.out.println（hello.gethelloword（));

}

发表于：2007-07-17 17:24:082楼得分:0

谢了．．可以了．．

发表于：2007-07-19 14:13:563楼得分:0

该回复于2007-12-28 12:01:23被管理员或版主删除

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