如何在java中使用dom解析器按属性获取元素 [英] how to get element by attribute using dom parser in java
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问题描述
我不知道如何通过属性获取元素.我尝试了以下内容,但由于 item(1) 可能会随着循环的进行而发生变化,因此出现错误.一些字段标签可能会被剥离.所以位置可能会改变.我想得到:
I am not getting an idea how to get an element by its attribute. I tried something as below but getting error as the item(1) might change as the loop goes on. some field tags may be stripped off. so position might change. I want to get:
<field name="Test/Content/Modified">Thu Jun 01 13:11:43 2014</field>
XML:
<assets>
<document path="some/path/1">
<metadata>
<field name="Test/Content/Date">2013-12-20</field>
<field name="Test/Content/Modified">Thu Jun 01 13:11:43 2014</field>
<field name="Test/Locale">en_US</field>
<field name="Test/Content/SubSolution"></field>
</metadata>
</document>
<document path="some/path/2">
<metadata>
<field name="Test/Content/Date">2013-12-20</field>
<field name="Test/Locale">en_US</field>
<field name="Test/Content/Modified">Thu Jun 01 13:11:43 2014</field>
<field name="Test/Content/SubSolution"></field>
</metadata>
</document>
<assets>
java 部分代码:
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse("E:\\example.xml");
List<String> list = new ArrayList<>();
NodeList nList = doc.getElementsByTagName("document");
for (int i = 0; i < nList.getLength(); i++) {
Node nNode = nList.item(i);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
Date date = new Date(eElement.getElementsByTagName("field").item(1).getTextContent());
System.out.println(date);
Date date1 = new Date(2014 - 1900, 06 - 1, 04);
if (date.compareTo(date1) == 1) {
list.add(eElement.getAttribute("path").trim());
}
}
}
推荐答案
您需要遍历 field
节点并检查匹配的属性值:
You need to loop over the field
nodes and check the matching attribute value:
NodeList nList = doc.getElementsByTagName("document");
for (int i = 0; i < nList.getLength(); i++) {
Node nNode = nList.item(i);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
NodeList fieldNodes = eElement.getElementsByTagName("field");
for(int j = 0; j < fieldNodes.getLength(); j++) {
Node fieldNode = fieldNodes.item(j);
NamedNodeMap attributes = fieldNode.getAttributes();
Node attr = attributes.getNamedItem("name");
if(attr != null) {
if(attr.getTextContent().equals("Test/Content/Modified")) {
Date date = new Date(fieldNode.getTextContent());
System.out.println(date);
Date date1 = new Date(2014 - 1900, 06 - 1, 04);
if (date.compareTo(date1) == 1) {
list.add(eElement.getAttribute("path").trim());
}
}
}
}
}
}
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