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com.xiaoleilu.hutool.util.XmlUtil Maven / Gradle / Ivy
package com.xiaoleilu.hutool.util;
import java.beans.XMLDecoder;
import java.beans.XMLEncoder;
import java.io.BufferedWriter;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import javax.xml.namespace.QName;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import com.xiaoleilu.hutool.exceptions.UtilException;
import com.xiaoleilu.hutool.io.FileUtil;
import com.xiaoleilu.hutool.io.IoUtil;
import com.xiaoleilu.hutool.lang.Assert;
/**
* XML工具类 对象类型
* @param source XML文件
* @return 对象
* @throws IOException IO异常
*/
public static T readObjectFromXml(File source) throws IOException {
return readObjectFromXml(new InputSource(FileUtil.getInputStream(source)));
}
/**
* 从XML中读取对象
* Reads serialized object from the XML file.
*
* @param 对象类型
* @param xmlStr XML内容
* @return 对象
* @throws IOException IO异常
* @since 3.2.0
*/
public static T readObjectFromXml(String xmlStr) throws IOException {
return readObjectFromXml(new InputSource(StrUtil.getReader(xmlStr)));
}
/**
* 从XML中读取对象
* Reads serialized object from the XML file.
*
* @param 对象类型
* @param source {@link InputSource}
* @return 对象
* @throws IOException IO异常
* @since 3.2.0
*/
@SuppressWarnings("unchecked")
public static T readObjectFromXml(InputSource source) throws IOException {
Object result = null;
XMLDecoder xmldec = null;
try {
xmldec = new XMLDecoder(source);
result = xmldec.readObject();
} finally {
IoUtil.close(xmldec);
}
return (T) result;
}
// -------------------------------------------------------------------------------------- Write
/**
* 将XML文档转换为String getElements(Element element, String tagName) {
final NodeList nodeList = StrUtil.isBlank(tagName) ? element.getChildNodes() : element.getElementsByTagName(tagName);
return transElements(element, nodeList);
}
/**
* 根据节点名获得第一个子节点
*
* @param element 节点
* @param tagName 节点名
* @return 节点
*/
public static Element getElement(Element element, String tagName) {
final NodeList nodeList = element.getElementsByTagName(tagName);
if (nodeList == null || nodeList.getLength() < 1) {
return null;
}
int length = nodeList.getLength();
for (int i = 0; i < length; i++) {
Element childEle = (Element) nodeList.item(i);
if (childEle == null || childEle.getParentNode() == element) {
return childEle;
}
}
return null;
}
/**
* 根据节点名获得第一个子节点
*
* @param element 节点
* @param tagName 节点名
* @return 节点中的值
*/
public static String elementText(Element element, String tagName) {
Element child = getElement(element, tagName);
return child == null ? null : child.getTextContent();
}
/**
* 根据节点名获得第一个子节点
*
* @param element 节点
* @param tagName 节点名
* @param defaultValue 默认值
* @return 节点中的值
*/
public static String elementText(Element element, String tagName, String defaultValue) {
Element child = getElement(element, tagName);
return child == null ? defaultValue : child.getTextContent();
}
/**
* 将NodeList转换为Element列表
*
* @param nodeList NodeList
* @return Element列表
*/
public static List transElements(NodeList nodeList) {
return transElements(null, nodeList);
}
/**
* 将NodeList转换为Element列表
*
* @param parentEle 父节点，如果指定将返回此节点的所有直接子节点，nul返回所有就节点
* @param nodeList NodeList
* @return Element列表
*/
public static List transElements(Element parentEle, NodeList nodeList) {
final ArrayList elements = new ArrayList();
int length = nodeList.getLength();
for (int i = 0; i < length; i++) {
Element element = (Element) nodeList.item(i);
if (parentEle == null || element.getParentNode() == parentEle) {
elements.add(element);
}
}
return elements;
}
/**
* 将可序列化的对象转换为XML写入文件，已经存在的文件将被覆盖 对象类型
* @param dest 目标文件
* @param t 对象
* @throws IOException IO异常
*/
public static void writeObjectAsXml(File dest, T t) throws IOException {
XMLEncoder xmlenc = null;
try {
xmlenc = new XMLEncoder(FileUtil.getOutputStream(dest));
xmlenc.writeObject(t);
} finally {
//关闭XMLEncoder会相应关闭OutputStream
IoUtil.close(xmlenc);
}
}
/**
* 创建XPath
