xml的节点删除问题
<?xml version="1.0" encoding="UTF-8"?><library>
<book>
<id>b001</id>
<title>我是一个兵</title>
<author>大兵</author>
</book>
<book>
<id>007</id>
<title>bookname</title>
<author>ding</author>
</book>
<book>
<id>007</id>
<title>bookname</title>
<author>ding</author>
</book>
<book>
<id>007</id>
<title>bookname</title>
<author>ding</author>
</book>
</library>
我想在JBuilder中删除<author>节点,我写了这个方法
public void Delete(Document doc,String tagname){
NodeList node=doc.getElementsByTagName(tagname);
for(int i=0; i<node.getLength(); i++){
node.item(i).getParentNode().removeChild(node.item(i));
}
}然后在主函数中调用,运行的时候弹出这样一个错Fatal exception occurred. Program will exit.
报这样的错误
java.lang.NullPointerException
at AddBook.Delete(AddBook.java:91)
at AddBook.main(AddBook.java:113)
Exception in thread "main"
xml文件中的<author>节点没有删除掉.请高手指点,在线急等......
