javaweb学习总结十一(JAXP对XML文档进行DOM解析)

一：将内存中写好的xml文件读取到硬盘上

二：DOM方式对xml文件进行增删改查

1：添加节点(默认是在最后的子节点后面添加)

 @Test
     // 向元素中添加节点<version>1.0</version>
     public void test5() throws Exception {
         Document doc = getDoc();
         Node node = doc.getElementsByTagName("book").item(0);

         // 创建节点
         Element newChild = doc.createElement("version");
         newChild.setTextContent("1.3");
         // 添加节点
         node.appendChild(newChild);

         // 将内存中xml读取到硬盘中
         TransformerFactory factory = TransformerFactory.newInstance();
         Transformer tf = factory.newTransformer();
         tf.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(
                 "xml/books.xml")));
     }

2：在指定位置添加节点

 @Test
     // 2:在指定位置添加子节点
     public void test6() throws Exception {
         Document doc = getDoc();
         // 获取要添加节点的父节点
         Node node = doc.getElementsByTagName("book").item(1);

         // 获取参考节点
         Node refNode = doc.getElementsByTagName("author").item(1);

         // 创建节点
         Node childNode = doc.createElement("version");
         childNode.setTextContent("2.34");

         // 将节点添加到指定位置
         node.insertBefore(childNode, refNode);

         // 将内存中xml读取到硬盘中
         TransformerFactory factory = TransformerFactory.newInstance();
         Transformer tf = factory.newTransformer();
         tf.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(
                 "xml/books.xml")));
     }

3：删除节点(方式一)

 @Test
     // 3:删除节点
     public void test7() throws Exception {
         Document doc = getDoc();
         // 获取要删除节点的父节点
         Node node = doc.getElementsByTagName("book").item(1);
         Node childNode = doc.getElementsByTagName("version").item(0);
         node.removeChild(childNode);

         // 将内存中xml读取到硬盘中
         TransformerFactory factory = TransformerFactory.newInstance();
         Transformer tf = factory.newTransformer();
         tf.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(
                 "xml/books.xml")));
     }

4：删除节点(方式二)

 @Test
     public void test8() throws Exception {
         Document doc = getDoc();
         // 获取要删除的节点
         Node childNode = doc.getElementsByTagName("version").item(0);
         childNode.getParentNode().removeChild(childNode);

         // 将内存中xml读取到硬盘中
         TransformerFactory factory = TransformerFactory.newInstance();
         Transformer tf = factory.newTransformer();
         tf.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(
                 "xml/books.xml")));
     }

5:修改节点内容

 @Test
     // 修改节点内容
     public void test9() throws Exception {
         Document doc = getDoc();
         // 获取要删除的节点
         Node node = doc.getElementsByTagName("price").item(0);
         node.setTextContent("200");

         // 将内存中xml读取到硬盘中
         TransformerFactory factory = TransformerFactory.newInstance();
         Transformer tf = factory.newTransformer();
         tf.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(
                 "xml/books.xml")));
     }

6:添加节点属性

 @Test
     // 添加节点属性
     public void test10() throws Exception {
         Document doc = getDoc();
         // 获取要删除的节点
         Element ele = (Element) doc.getElementsByTagName("name").item(0);
         ele.setAttribute("style", "width:80px;");

         // 将内存中xml读取到硬盘中
         TransformerFactory factory = TransformerFactory.newInstance();
         Transformer tf = factory.newTransformer();
         tf.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(
                 "xml/books.xml")));
     }

7:删除节点属性

 @Test
     // 删除节点属性
     public void test11() throws Exception {
         Document doc = getDoc();
         // 获取要删除属性的节点
         Element ele = (Element) doc.getElementsByTagName("name").item(0);
         ele.removeAttribute("style");

         // 将内存中xml读取到硬盘中
         TransformerFactory factory = TransformerFactory.newInstance();
         Transformer tf = factory.newTransformer();
         tf.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(
                 "xml/books.xml")));
     }