xml解析之----DOM解析(二)
//得到要向哪个节点上挂子节点
Node book = document.getElementsByTagName("书").item(0);
//向参考节点前，挂新节点
book.insertBefore(price, document.getElementsByTagName("售价").item(0));
//把内存中更新后对象树，重新定回到xml文档中
TransformerFactory factory = TransformerFactory.newInstance();
Transformer tf = factory.newTransformer();
tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml")));
}
//向xml文档添加节点属性
@Test
public void test5() throws Exception{
Document document = this.document;
//得到要添加属性的节点
Element author = (Element) document.getElementsByTagName("作者").item(0);
author.setAttribute("id", "12"); //向节点挂属性
//把内存中更新后对象树，重新定回到xml文档中
TransformerFactory factory = TransformerFactory.newInstance();
Transformer tf = factory.newTransformer();
tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml")));
}
//删除xml文档中的售价节点
@Test
public void test6() throws Exception{
Document document = this.document;
//得到要删除的节点
Node price = document.getElementsByTagName("售价").item(0);
//得到要删除的节点的父亲
Node parent = document.getElementsByTagName("书").item(0);
parent.removeChild(price);
//把内存中更新后对象树，重新定回到xml文档中
TransformerFactory factory = TransformerFactory.newInstance();
Transformer tf = factory.newTransformer();
tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml")));
}
//删除2 : 删除售价节点所在的书结点
@Test
public void test7() throws Exception{
Document document = this.document;
//得到要删除的节点
Node price = document.getElementsByTagName("售价").item(0);
price.getParentNode().getParentNode().removeChild(price.getParentNode());
//把内存中更新后对象树，重新定回到xml文档中
TransformerFactory factory = TransformerFactory.newInstance();
Transformer tf = factory.newTransformer();
tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml")));
}
@Test
public void test8() throws Exception{
Document document = this.document;
document.getElementsByTagName("售价").item(1).setTextContent("19元");
//把内存中更新后对象树，重新定回到xml文档中
TransformerFactory factory = TransformerFactory.newInstance();
Transformer tf = factory.newTransformer();
tf.transform(new DOMSource(document), new StreamResult(new FileOutputStream("src/book.xml")));
}
}