DocumentHelper xml工具包
最新推荐文章于 2022-08-02 16:03:26 发布
Coolyqq
最新推荐文章于 2022-08-02 16:03:26 发布
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分类专栏：
java
文章标签：
xml
xml工具
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本文链接：https://blog.csdn.net/Coolyqq/article/details/40116355
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本文介绍了一个用于解析XML文档的Java工具类，提供了多种方法来帮助开发者读取和操作XML文件，包括从输入流和文件中解析文档、获取指定名称的子元素、提取属性值等。
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public class DocumentHelper
{
public static Document parse(InputStream is)
throws ParserConfigurationException, IOException, SAXException
{
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
Document document = factory.newDocumentBuilder().parse(is);
return document;
}
public static Document parse(File file) throws ParserConfigurationException, IOException, SAXException {
InputStream is = null;
try {
is = new FileInputStream(file);
Document localDocument = parse(is);
return localDocument;
}
finally
{
if (is != null)
is.close();
}
}
public static Element getElementChild(Element element, String name, boolean required) throws Exception {
NodeList nodes = element.getChildNodes();
for (int i = 0; i < nodes.getLength(); ++i) {
Node node = nodes.item(i);
if ((node instanceof Element) && (node.getLocalName().equals(name)) && (node.getNamespaceURI() == null)) {
return ((Element)node);
}
}
if (required) {
throw new Exception("Missing element " + name + " in " + element.getLocalName());
}
return null;
}
public static Element[] getElementChildren(Element element) {
List elements = new ArrayList();
NodeList nodes = element.getChildNodes();
for (int i = 0; i < nodes.getLength(); ++i) {
if (nodes.item(i) instanceof Element) {
elements.add((Element)nodes.item(i));
}
}
return ((Element[])elements.toArray(new Element[0]));
}
public static Element[] getElementChildren(Element element, String name) {
Element[] elements = getElementChildren(element);
List taggedElements = new ArrayList();
for (int i = 0; i < elements.length; ++i) {
if ((elements[i].getLocalName().equals(name)) && (elements[i].getNamespaceURI() == null)) {
taggedElements.add(elements[i]);
}
}
return ((Element[])taggedElements.toArray(new Element[0]));
}
public static String getAttribute(Element element, String name, boolean required) throws Exception {
if (!(element.hasAttribute(name))) {
if (required) {
throw new Exception("Missing attribute " + name + " on element " + element.getLocalName());
}
return null;
}
return element.getAttribute(name);
}
public static boolean getBooleanAttribute(Element element, String name, boolean defaultValue) throws Exception {
String value = element.getAttribute(name);
if (value.equals("")) {
return defaultValue;
}
return value.equalsIgnoreCase("true");
}
public static boolean getBooleanElement(Element element, String name, boolean defaultValue) throws Exception {
Element child = getElementChild(element, name, false);
if (child == null) {
return defaultValue;
}
return getElementText(child, true).equalsIgnoreCase("true");
}
public static String getStringElement(Element element, String name, String defaultValue) throws Exception {
Element child = getElementChild(element, name, false);
if (child == null) {
return defaultValue;
}
return getElementText(child, true);
}
public static int getIntegerElement(Element element, String name, int defaultValue) throws Exception {
Element child = getElementChild(element, name, false);
if (child == null) {
return defaultValue;
}
String text = getElementText(child, true);
try {
return Integer.parseInt(text);
} catch (NumberFormatException e) {
throw new RuntimeException("Invalid integer value " + text + " in element " + name);
}
}
public static String getElementText(Element element, boolean required) throws Exception {
StringBuilder text = new StringBuilder(30);
NodeList nodes = element.getChildNodes();
for (int i = 0; i < nodes.getLength(); ++i) {
Node node = nodes.item(i);
if (node instanceof Text) {
text.append(node.getNodeValue());
}
}
if ((required) && (text.length() == 0))
throw new Exception("Missing text content in element " + element.getLocalName());
if (text.length() == 0) {
return null;
}
return text.toString();
}
}