Question

我一直在寻找读取XML标签及其值，我可以找到的是使用标签名称读取值，但不知道标签名称是否可以读取所有值，如果是这样请解释我

示例XML

<menu>
        <item>
            <id>1</id>    
            <name>test1</name>
            <cost>155</cost>
            <description>Single</description>
        </item> 
        <item>
            <id>2</id>    
            <name>test2</name>
            <cost>225</cost>
            <description>double</description>
        </item> 
        <item>
            <id>3</id>    
            <name>test3</name>
            <cost>110</cost>
            <description>long</description>
        </item> 
        <item>
            <id>4</id>    
            <name>test4</name>
            <cost>155</cost>
            <description>float</description>
        </item> 
        <item>
            <id>5</id>    
            <name>test5</name>
            <cost>445</cost>
            <description>integer</description>
        </item> 

</menu>

Answer 1

试一试。

 DocumentBuilderFactory a = DocumentBuilderFactory.newInstance();

    Document doc = dbf.newDocumentBuilder().parse(file);
    doc.getDocumentElement().normalize(); // Not Mandatory

    NodeList elements=doc.getElementsByTagName("*");
    for (int i=0; i<elements.getLength(); i++) 
    {
        // Get element
        Element elem = (Element)elements.item(i);
        System.out.println(elem.getNodeName());
    }

Answer 2

我一直在修补同样的问题，并认为我找到了解决方案：

private void listNodes(NodeList nodeList){


    // Loop through the node list
    for (int temp = 0; temp < (nodeList != null ? nodeList.getLength() : 0); temp++) {

        Node node = nodeList.item(temp);
        // if node is element
        if (node.getNodeType() == Node.ELEMENT_NODE) {

            // create element from node
            Element element = (Element) node;

            // get tag name from element
            Log.d("tag", "tag/node: " + element.getTagName());

            // if node has children repeat the loop until last child
            if (node.hasChildNodes()) {

                listNodes(node.getChildNodes());

            }

        }

    }

}

这将为您提供所有节点的标记，现在您只需要将其实现到所需的xml级别。一旦你有标签将它们放在一个数组中并从中获取元素。

修改

好的，所以我已经玩了一段时间并获得了一些有趣的结果。首先，我设置了我的xmls，以便每行都在<item>标记中，因此不存在混淆。这是我用来获取节点列表的内容：

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

try {

    DocumentBuilder builder = dbf.newDocumentBuilder();
    // input stream of any kind, can be local or from URL
    Document doc = builder.parse(new InputSource(inputStream));
    doc.getDocumentElement().normalize();

    // rowNodeName in my case is "item" so you can change this to anything suitable
    nodeList = doc.getElementsByTagName(rowNodeName);

} catch (ParserConfigurationException | IOException | SAXException e) {

    e.printStackTrace();

}

现在您已经拥有了这样的节点列表：

// a global object for tag strings
nodeNames = new ArrayList<>();

// populate tag list by reading them from first element
listNodes(nodeList.item(0).getChildNodes(), false);

// list nodes, notice the second parameter is boolean
listNodes(nodeList,true);

最终的listNodes方法如下：

private void listNodes(NodeList list, boolean getValues) {

    for (int temp = 0; temp < (list != null ? list.getLength() : 0); temp++) {

        Node node = list.item(temp);

        if (node.getNodeType() == Node.ELEMENT_NODE) {

            Element element = (Element) node;

            // if you want values then you loop through the tag names and get node values for those tags
            if (getValues) {

                Bundle bundle = new Bundle();

                for(int i = 0; i< nodeNames.size(); i++){

                    bundle.putString(nodeNames.get(i), getNode(nodeNames.get(i),element));

                }

                xmlTableRows.add(bundle);

            } else {
                /// if you want tags just read them from node
                nodeNames.add(element.getTagName());

            }

        }

    }

}

getNode方法：

private static String getNode(String tag, Element element) {

    NodeList nlList = element.getElementsByTagName(tag).item(0)
            .getChildNodes();

    Node nValue = (Node) nlList.item(0);

    return nValue.getNodeValue();

}

所以现在你不依赖于知道xml中有多少标签或者它们的名字是什么。希望这会有所帮助。

从XML android java中读取所有标签和值

2 个答案: