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", "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")));
    }