dom4j基本使用_xpath基本使用_junit测试
2014-11-13 10:03
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1. Java项目(Eclipse)结构
2. 项目下载(0积分)
dom4j_xpath_junitTest.zip
3. 代码
2. 项目下载(0积分)
dom4j_xpath_junitTest.zip
3. 代码
package org.foo.utils;
import java.io.FileWriter;
import java.io.IOException;
import java.net.URL;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.junit.Test;
final public class XmlUtils {
private static URL URL = XmlUtils.class.getClassLoader().getResource("configuration.xml");
/** ---------------------------------- *\
获取Document对象
\* ---------------------------------- */
public static Document getDocument(URL url) throws DocumentException {
// url = XmlUtils.class.getResource("configuration.xml");
SAXReader reader = new SAXReader();
return reader.read( url );
}
public static Document getDocument(String xmlString) throws DocumentException {
/*
xmlString = "<configuration> " +
" <users> " +
" <user id='user_1' loginName='zhangsan' password='123'/> " +
" <user id='user_2' loginName='lisi' password='456'> " +
" <role name='admin'/> " +
" <role name='programmer'/> " +
" </user> " +
" </users> " +
"</configuration> " ;
*/
return DocumentHelper.parseText(xmlString);
}
public static Document getDocument() throws DocumentException {
// 空文档
return DocumentHelper.createDocument();
}
/** ---------------------------------- *\
将文档写入XML文件
\* ---------------------------------- */
// 普通写入(全英文,无缩进无换行)
public static void write2Xml(Document document) throws IOException {
XMLWriter writer = null;
try {
writer = new XMLWriter( new FileWriter(URL.getPath()) );
writer.write(document);
} finally {
if (writer != null) {
writer.close();
}
}
}
// 格式化写入(指定编码,缩进+换行)
public static void write2XmlWithPrettyFormatAndEncoding(Document document, String encoding) throws IOException {
XMLWriter writer = null;
try {
// format
OutputFormat format = OutputFormat.createPrettyPrint();
// characterSet, eg. UTF-8 GBK
format.setEncoding(encoding);
writer = new XMLWriter( new FileWriter(URL.getPath()), format );
writer.write(document);
} finally {
if (writer != null) {
writer.close();
}
}
}
/** ---------------------------------- *\
字符串 <==> XML
\* ---------------------------------- */
public static Document xmlString2Document(String xmlString) throws DocumentException {
if (xmlString == null) {
xmlString = "<configuration> " +
" <users> " +
" <user id='user_1' loginName='zhangsan' password='123'/> " +
" <user id='user_2' loginName='lisi' password='456'> " +
" <role name='admin'/> " +
" <role name='programmer'/> " +
" </user> " +
" </users> " +
"</configuration> " ;
}
return DocumentHelper.parseText(xmlString);
}
public static String document2XmlString(Document document) {
return document.asXML();
}
/** ---------------------------------- *\
节点对象操作
\* ---------------------------------- */
// 1. 获取根节点
@Test public void testOperationNode_1() throws Exception {
Document document = getDocument( URL );
Element rootElement = document.getRootElement();
System.out.println("<" + rootElement.getName() + ">");
}
// 2. 获取节点的<第一个>子节点
@Test public void testOperationNode_2() throws Exception {
Document document = getDocument( URL );
Element rootElement = document.getRootElement();
Element firstChild = rootElement.element("users");
System.out.println("<" + firstChild.getName() + ">");
}
// 3. 获取标签体内容( Text,CDATA and Entitynodes )
@Test public void testOperationNode_3() throws Exception {
Document document = getDocument( URL );
Element rootElement = document.getRootElement();
String text = rootElement.getText();
System.out.println("[" + text + "]");
}
// 4. 获取<所有的>子节点
@Test public void testOperationNode_4() throws Exception {
Document document = getDocument( URL );
Element rootElement = document.getRootElement();
Element firstChild = rootElement.element("users");
List<Element> children = firstChild.elements();
for (Iterator it = children.iterator(); it.hasNext();) {
Element e = (Element) it.next();
System.out.println( "<" + e.getName() + ">");
}
}
// 5. 遍历<子节点>
@Test public void testOperationNode_5() throws Exception {
Document document = getDocument( URL );
Element rootElement = document.getRootElement();
Element firstChild = rootElement.element("users");
for (Iterator it = firstChild.elementIterator(); it.hasNext();) {
Element e = (Element) it.next();
System.out.println( "<" + e.getName() + ">");
}
}
// 6. 遍历<指定名称>的<子节点>
@Test public void testOperationNode_6() throws Exception {
Document document = getDocument( URL );
Element rootElement = document.getRootElement();
for (Iterator it = rootElement.elementIterator("users"); it.hasNext();) {
Element e = (Element) it.next();
System.out.println( "<" + e.getName() + ">");
}
}
// 7. 添加<子节点> 注:操作节点后,需要将 document写入xml文件
@Test public void testOperationNode_7() throws Exception {
Document document = getDocument( URL );
Element rootElement = document.getRootElement();
rootElement.addElement("addElment");
System.out.println( document2XmlString(document) );
}
// 8. 给节点<添加文本>
@Test public void testOperationNode_8() throws Exception {
Document document = getDocument( URL );
Element rootElement = document.getRootElement();
rootElement.addElement("addElment")
.setText("a new child");;
System.out.println( document2XmlString(document) );
}
// 9. 删除<子节点>
@Test public void testOperationNode_9() throws Exception {
Document document = getDocument( URL );
Element rootElement = document.getRootElement();
rootElement.remove( rootElement.element("users") );
System.out.println( document2XmlString(document) );
}
// 10. 添加 CDATA节点
@Test public void testOperationNode_10() throws Exception {
Document document = getDocument( URL );
Element rootElement = document.getRootElement();
rootElement.addCDATA("<c:if test=\"{wahh}\"></c:if>");
System.out.println( document2XmlString(document) );
}
// 11. 根据<ID属性值>获取节点
@Test public void testOperationNode_11() throws Exception {
Document document = getDocument( URL );
// ID="user_1"
Element element = document.elementByID("user_1");
System.out.println( element.getName() );
}
/** ---------------------------------- *\
节点对象的属性操作
\* ---------------------------------- */
// 1. 获取某节点的<属性节点>
@Test public void testOperationAttr_1() throws Exception {
Document document = getDocument( URL );
Element element = document.elementByID("user_1");
Attribute loginNameAttribute = element.attribute("loginName");
System.out.println(loginNameAttribute);
}
// 2. 获取<属性节点>的值
@Test public void testOperationAttr_2() throws Exception {
Document document = getDocument( URL );
Element element = document.elementByID("user_1");
Attribute loginNameAttribute = element.attribute("loginName");
System.out.println(loginNameAttribute.getValue());
System.out.println(loginNameAttribute.getText());
}
// 3. 删除<属性节点>
@Test public void testOperationAttr_3() throws Exception {
Document document = getDocument( URL );
Element element = document.elementByID("user_1");
Attribute loginNameAttribute = element.attribute("loginName");
element.remove(loginNameAttribute);
System.out.println( document2XmlString(document) );
}
// 4. 遍历节点的所有属性
@Test public void testOperationAttr_4() throws Exception {
Document document = getDocument( URL );
Element element = document.elementByID("user_1");
for (Iterator it = element.attributeIterator(); it.hasNext();){
Attribute attribute = (Attribute) it.next();
String attributeName = attribute.getName();
String attributeValue = attribute.getValue();
System.out.println(attributeName + "=" + attributeValue);
}
}
// 5. <添加/替换>属性节点
@Test public void testOperationAttr_5() throws Exception {
Document document = getDocument( URL );
Element element = document.elementByID("user_1");
element.addAttribute("loginName", "zhang123"); // 替换
element.addAttribute("newAttr", "wahh"); // 添加
System.out.println(document2XmlString(document));
}
/** ---------------------------------- *\
xpath-路径表达式
\* ---------------------------------- */
/*
/ 从根节点选取; 从子节点中选
// 从匹配选择的当前节点选择文档中的节点，而不考虑它们的位置; 从后代中选
. 选取当前节点
.. 选取当前节点的父节点
@ 选取属性
*/
// 1. "/configuration/users/user" 从根节点开始,选取所有的<user>
@Test public void testXpath_1() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "/configuration/users/user";
List<Element> nodeList = document.selectNodes(xpathExpression);
for (Element element : nodeList) {
System.out.println(element.attributeValue("ID"));
}
}
// 2. "//user" 选取所有的<user>
@Test public void testXpath_2() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//user";
List<Element> nodeList = document.selectNodes(xpathExpression);
for (Element element : nodeList) {
System.out.println(element.attributeValue("ID"));
}
}
// 3. "//users/user" 选取<users>的所有<user>子节点
@Test public void testXpath_3() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//users/user";
List<Element> nodeList = document.selectNodes(xpathExpression);
for (Element element : nodeList) {
System.out.println(element.attributeValue("ID"));
}
}
// 4. "/configuration//user" 选取<configuration>的所有<user>后代节点
@Test public void testXpath_4() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "/configuration//user";
List<Element> nodeList = document.selectNodes(xpathExpression);
for (Element element : nodeList) {
System.out.println(element.attributeValue("ID"));
}
}
// 5. "//@loginName" 选取有属性名为 loginName 的属性节点
@Test public void testXpath_5() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//@loginName";
List<Attribute> attributeList = document.selectNodes(xpathExpression);
for (Attribute attribute : attributeList) {
System.out.println(attribute.getValue());
}
}
// 6. "//@password='123'" 是否存在 loginName='zhangsan' 的节点
@Test public void testXpath_6() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//@password='123'";
List<Boolean> list = document.selectNodes(xpathExpression);
for (Boolean isExist : list) {
System.out.println(isExist);
}
}
/** ---------------------------------- *\
xpath-谓语（Predicates）
谓语用来查找某个特定的节点或者包含某个指定的值的节点。
谓语被嵌在方括号中。
\* ---------------------------------- */
// 1. "//user[1]" 选取第一个<user>节点, 节点索引从1开始
@Test public void testPredicates_1() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//user[1]";
List<Element> nodeList = document.selectNodes(xpathExpression);
for (Element element : nodeList) {
System.out.println(element.attributeValue("ID"));
}
}
// 2. "//user[last()]" 选取最后<user>节点
@Test public void testPredicates_2() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//user[last()]";
List<Element> nodeList = document.selectNodes(xpathExpression);
for (Element element : nodeList) {
System.out.println(element.attributeValue("ID"));
}
}
// 3. "//user[last()-1]" 选倒数第二个<user>节点
@Test public void testPredicates_3() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//user[last()-1]";
List<Element> nodeList = document.selectNodes(xpathExpression);
for (Element element : nodeList) {
System.out.println(element.attributeValue("ID"));
}
}
// 4. "//user[position()<3]" 选前两个<user>节点
@Test public void testPredicates_4() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//user[position()<3]";
List<Element> nodeList = document.selectNodes(xpathExpression);
for (Element element : nodeList) {
System.out.println(element.attributeValue("ID"));
}
}
// 5. "//user[@loginName]" 选有loginName属性的<user>节点
@Test public void testPredicates_5() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//user[@loginName]";
List<Element> nodeList = document.selectNodes(xpathExpression);
for (Element element : nodeList) {
System.out.println(element.attributeValue("ID"));
}
}
// 6. "//user[@loginName='zhangsan']" 选 loginName属性=zhangsan 的<user>节点
@Test public void testPredicates_6() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//user[@loginName='zhangsan']";
List<Element> nodeList = document.selectNodes(xpathExpression);
for (Element element : nodeList) {
System.out.println(element.attributeValue("ID"));
}
}
/** ---------------------------------- *\
通配符
\* ---------------------------------- */
/*
* 匹配任何元素节点
@* 匹配任何属性节点
node() 匹配任何类型节点
*/
// 1. "//products/*" products的所有子节点(元素节点)
@Test public void testWildcard_1() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//products/*";
List<Element> nodeList = document.selectNodes(xpathExpression);
for (Element element : nodeList) {
System.out.println(element.attributeValue("name"));
}
}
// 2. "//*" 所有元素节点
@Test public void testWildcard_2() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//*";
List<Element> nodeList = document.selectNodes(xpathExpression);
for (Element element : nodeList) {
System.out.println(element.getName());
}
}
// 3. "//product[@*]" 带有属性的<product>节点
@Test public void testWildcard_3() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//product[@*]";
List<Element> nodeList = document.selectNodes(xpathExpression);
for (Element element : nodeList) {
System.out.println(element.getName());
}
}
// 4. "//products/node()" <products>所有节点(元素节点,文本节点)
@Test public void testWildcard_4() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//products/node()";
List<Node> nodeList = document.selectNodes(xpathExpression);
for (Node node : nodeList) {
short nodeType = node.getNodeType();
switch (nodeType) {
case Node.ELEMENT_NODE:
System.out.println("<" + node.getName() + ">");
break;
case Node.ATTRIBUTE_NODE:
System.out.println(node.getName() + "=" + node.getText());
break;
case Node.TEXT_NODE:
System.out.println("[" + node.getText() + "]");
break;
}
}
}
/** ---------------------------------- *\
| 路径 连接, 求多个路径的并集
\* ---------------------------------- */
@Test public void testPathUnion() throws Exception {
Document document = getDocument( URL );
String xpathExpression = "//product[@name='Java'] | //user[@ID='user_3']";
List<Element> nodeList = document.selectNodes(xpathExpression);
for (Element element : nodeList) {
String nodeName = element.getName();
System.out.print("<" + nodeName);
for (Object attr : element.attributes()) {
Attribute attribute = (Attribute) attr;
String attributeName = attribute.getName();
String attributeValue = attribute.getValue();
System.out.print(" " + attributeName + "=\"" + attributeValue + "\"");
}
System.out.println(">");
}
}
}<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<users>
<user ID="user_1" loginName="zhangsan" password="123"/>
<user ID="user_2" loginName="lisi" password="123">
<role name="admin"/>
<role name="programmer"/>
</user>
<user ID="user_3" loginName="zhangsan" password="123"/>
</users>
<products>
<product name="Java" price="99.99"/>
<product name="JavaScript" price="77.99"/>
<product name="C" price="66.99"/>
<product name="C++" price="55.99"/>
<product name="C#" price="44.99"/>
<product/>
</products>
</configuration>
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