javaweb学习总结十一(JAX对XML文档进行DOM解析)

Posted 2020-08-05 格物致知

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)

 1 @Test
 2     // 向元素中添加节点<version>1.0</version>
 3     public void test5() throws Exception {
 4         Document doc = getDoc();
 5         Node node = doc.getElementsByTagName("book").item(0);
 6 
 7         // 创建节点
 8         Element newChild = doc.createElement("version");
 9         newChild.setTextContent("1.3");
10         // 添加节点
11         node.appendChild(newChild);
12 
13         // 将内存中xml读取到硬盘中
14         TransformerFactory factory = TransformerFactory.newInstance();
15         Transformer tf = factory.newTransformer();
16         tf.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(
17                 "xml/books.xml")));
18     }

2：在指定位置添加节点

 1 @Test
 2     // 2:在指定位置添加子节点
 3     public void test6() throws Exception {
 4         Document doc = getDoc();
 5         // 获取要添加节点的父节点
 6         Node node = doc.getElementsByTagName("book").item(1);
 7 
 8         // 获取参考节点
 9         Node refNode = doc.getElementsByTagName("author").item(1);
10 
11         // 创建节点
12         Node childNode = doc.createElement("version");
13         childNode.setTextContent("2.34");
14 
15         // 将节点添加到指定位置
16         node.insertBefore(childNode, refNode);
17 
18         // 将内存中xml读取到硬盘中
19         TransformerFactory factory = TransformerFactory.newInstance();
20         Transformer tf = factory.newTransformer();
21         tf.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(
22                 "xml/books.xml")));
23     }

3：删除节点(方式一)

 1 @Test
 2     // 3:删除节点
 3     public void test7() throws Exception {
 4         Document doc = getDoc();
 5         // 获取要删除节点的父节点
 6         Node node = doc.getElementsByTagName("book").item(1);
 7         Node childNode = doc.getElementsByTagName("version").item(0);
 8         node.removeChild(childNode);
 9 
10         // 将内存中xml读取到硬盘中
11         TransformerFactory factory = TransformerFactory.newInstance();
12         Transformer tf = factory.newTransformer();
13         tf.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(
14                 "xml/books.xml")));
15     }

4：删除节点(方式二)

 1 @Test
 2     public void test8() throws Exception {
 3         Document doc = getDoc();
 4         // 获取要删除的节点
 5         Node childNode = doc.getElementsByTagName("version").item(0);
 6         childNode.getParentNode().removeChild(childNode);
 7 
 8         // 将内存中xml读取到硬盘中
 9         TransformerFactory factory = TransformerFactory.newInstance();
10         Transformer tf = factory.newTransformer();
11         tf.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(
12                 "xml/books.xml")));
13     }

5:修改节点内容

 1 @Test
 2     // 修改节点内容
 3     public void test9() throws Exception {
 4         Document doc = getDoc();
 5         // 获取要删除的节点
 6         Node node = doc.getElementsByTagName("price").item(0);
 7         node.setTextContent("200");
 8 
 9         // 将内存中xml读取到硬盘中
10         TransformerFactory factory = TransformerFactory.newInstance();
11         Transformer tf = factory.newTransformer();
12         tf.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(
13                 "xml/books.xml")));
14     }

6:添加节点属性

 1 @Test
 2     // 添加节点属性
 3     public void test10() throws Exception {
 4         Document doc = getDoc();
 5         // 获取要删除的节点
 6         Element ele = (Element) doc.getElementsByTagName("name").item(0);
 7         ele.setAttribute("style", "width:80px;");
 8 
 9         // 将内存中xml读取到硬盘中
10         TransformerFactory factory = TransformerFactory.newInstance();
11         Transformer tf = factory.newTransformer();
12         tf.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(
13                 "xml/books.xml")));
14     }

7:删除节点属性

 1 @Test
 2     // 删除节点属性
 3     public void test11() throws Exception {
 4         Document doc = getDoc();
 5         // 获取要删除属性的节点
 6         Element ele = (Element) doc.getElementsByTagName("name").item(0);
 7         ele.removeAttribute("style");
 8 
 9         // 将内存中xml读取到硬盘中
10         TransformerFactory factory = TransformerFactory.newInstance();
11         Transformer tf = factory.newTransformer();
12         tf.transform(new DOMSource(doc), new StreamResult(new FileOutputStream(
13                 "xml/books.xml")));
14     }