XmlHelper.java
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package com.jfinal.weixin.sdk.utils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import javax.xml.namespace.QName;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.util.HashMap;
import java.util.Map;
/**
* xpath解析xml
* <pre>
* 文档地址:
* http://www.w3school.com.cn/xpath/index.asp
* </pre>
*/
public class XmlHelper {
private final XPath path;
private final Document doc;
private XmlHelper(InputSource inputSource) throws ParserConfigurationException, SAXException, IOException {
DocumentBuilderFactory dbf = getDocumentBuilderFactory();
DocumentBuilder db = dbf.newDocumentBuilder();
doc = db.parse(inputSource);
path = getXPathFactory().newXPath();
}
private static XmlHelper create(InputSource inputSource) {
try {
return new XmlHelper(inputSource);
} catch (ParserConfigurationException e) {
throw new RuntimeException(e);
} catch (SAXException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public static XmlHelper of(InputStream is) {
InputSource inputSource = new InputSource(is);
return create(inputSource);
}
public static XmlHelper of(String xmlStr) {
StringReader sr = new StringReader(xmlStr.trim());
InputSource inputSource = new InputSource(sr);
XmlHelper xmlHelper = create(inputSource);
IOUtils.closeQuietly(sr);
return xmlHelper;
}
private Object evalXPath(String expression, Object item, QName returnType) {
item = null == item ? doc : item;
try {
return path.evaluate(expression, item, returnType);
} catch (XPathExpressionException e) {
throw new RuntimeException(e);
}
}
/**
* 获取String
* @param expression 路径
* @return String
*/
public String getString(String expression) {
return (String) evalXPath(expression, null, XPathConstants.STRING);
}
/**
* 获取Boolean
* @param expression 路径
* @return String
*/
public Boolean getBoolean(String expression) {
return (Boolean) evalXPath(expression, null, XPathConstants.BOOLEAN);
}
/**
* 获取Number
* @param expression 路径
* @return {Number}
*/
public Number getNumber(String expression) {
return (Number) evalXPath(expression, null, XPathConstants.NUMBER);
}
/**
* 获取某个节点
* @param expression 路径
* @return {Node}
*/
public Node getNode(String expression) {
return (Node) evalXPath(expression, null, XPathConstants.NODE);
}
/**
* 获取子节点
* @param expression 路径
* @return NodeList
*/
public NodeList getNodeList(String expression) {
return (NodeList) evalXPath(expression, null, XPathConstants.NODESET);
}
/**
* 获取String
* @param node 节点
* @param expression 相对于node的路径
* @return String
*/
public String getString(Object node, String expression) {
return (String) evalXPath(expression, node, XPathConstants.STRING);
}
/**
* 获取
* @param node 节点
* @param expression 相对于node的路径
* @return String
*/
public Boolean getBoolean(Object node, String expression) {
return (Boolean) evalXPath(expression, node, XPathConstants.BOOLEAN);
}
/**
* 获取
* @param node 节点
* @param expression 相对于node的路径
* @return {Number}
*/
public Number getNumber(Object node, String expression) {
return (Number) evalXPath(expression, node, XPathConstants.NUMBER);
}
/**
* 获取某个节点
* @param node 节点
* @param expression 路径
* @return {Node}
*/
public Node getNode(Object node, String expression) {
return (Node) evalXPath(expression, node, XPathConstants.NODE);
}
/**
* 获取子节点
* @param node 节点
* @param expression 相对于node的路径
* @return NodeList
*/
public NodeList getNodeList(Object node, String expression) {
return (NodeList) evalXPath(expression, node, XPathConstants.NODESET);
}
/**
* 针对没有嵌套节点的简单处理
* @return map集合
*/
public Map<String, String> toMap() {
Element root = doc.getDocumentElement();
Map<String, String> params = new HashMap<String, String>();
// 将节点封装成map形式
NodeList list = root.getChildNodes();
for (int i = 0; i < list.getLength(); i++) {
Node node = list.item(i);
if (node instanceof Element) {
params.put(node.getNodeName(), node.getTextContent());
}
}
return params;
}
private static DocumentBuilderFactory getDocumentBuilderFactory(){
return XmlHelper.XmlHelperHolder.documentBuilderFactory;
}
private static XPathFactory getXPathFactory() {
return XmlHelper.XmlHelperHolder.xPathFactory;
}
/**
* 内部类单例
*/
private static class XmlHelperHolder {
private static DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
private static XPathFactory xPathFactory = XPathFactory.newInstance();
}
}