import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.stream.EventFilter;
import javax.xml.stream.FactoryConfigurationError;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.stream.events.XMLEvent;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.junit.Test;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class TestStax {
@Test
public void test01() {
XMLInputFactory factory = XMLInputFactory.newInstance();
InputStream is = null;
try {
is = TestStax.class.getClassLoader().getResourceAsStream("books.xml");
XMLStreamReader reader = factory.createXMLStreamReader(is);
while (reader.hasNext()) {
int type = reader.next();
// 判断节点类型是否是开始或者结束或者文本节点,之后根据情况及进行处理
if (type == XMLStreamConstants.START_ELEMENT) {
System.out.println(reader.getName());
} else if (type == XMLStreamConstants.CHARACTERS) {
System.out.println(reader.getText().trim());
} else if (type == XMLStreamConstants.END_ELEMENT) {
System.out.println("/" + reader.getName());
}
}
} catch (XMLStreamException e) {
e.printStackTrace();
} finally {
try {
if (is != null)
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Test
public void test02() {
XMLInputFactory factory = XMLInputFactory.newInstance();
InputStream is = null;
try {
is = TestStax.class.getClassLoader().getResourceAsStream("books.xml");
XMLStreamReader reader = factory.createXMLStreamReader(is);
while (reader.hasNext()) {
int type = reader.next();
if (type == XMLStreamConstants.START_ELEMENT) {
String name = reader.getName().toString();
if (name.equals("book")) {
//获得book元素的属性
System.out.println(reader.getAttributeName(0) + ":" + reader.getAttributeValue(0));
}
}
}
} catch (XMLStreamException e) {
e.printStackTrace();
} finally {
try {
if (is != null)
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Test
public void test03() {
XMLInputFactory factory = XMLInputFactory.newInstance();
InputStream is = null;
try {
is = TestStax.class.getClassLoader().getResourceAsStream("books.xml");
XMLStreamReader reader = factory.createXMLStreamReader(is);
while (reader.hasNext()) {
int type = reader.next();
if (type == XMLStreamConstants.START_ELEMENT) {
String name = reader.getName().toString();
if (name.equals("title")) {
System.out.print(reader.getElementText() + ":");
}
if (name.equals("price")) {
System.out.print(reader.getElementText() + "\n");
}
}
}
} catch (XMLStreamException e) {
e.printStackTrace();
} finally {
try {
if (is != null)
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Test
public void test04() {
XMLInputFactory factory = XMLInputFactory.newInstance();
InputStream is = null;
try {
is = TestStax.class.getClassLoader().getResourceAsStream("books.xml");
// 基于迭代模型的操作方式
XMLEventReader reader = factory.createXMLEventReader(is);
int num = 0;
while (reader.hasNext()) {
// 通过XMLEvent来获取是否是某种节点类型
XMLEvent event = reader.nextEvent();
if (event.isStartElement()) {
// 通过event.asxxx转换节点
String name = event.asStartElement().getName().toString();
if (name.equals("title")) {
System.out.print(reader.getElementText() + ":");
}
if (name.equals("price")) {
System.out.print(reader.getElementText() + "\n");
}
}
num++;
}
System.out.println(num);
} catch (XMLStreamException e) {
e.printStackTrace();
} finally {
try {
if (is != null)
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Test
public void test05() {
XMLInputFactory factory = XMLInputFactory.newInstance();
InputStream is = null;
try {
is = TestStax.class.getClassLoader().getResourceAsStream("books.xml");
// 基于Filter的过滤方式，可以有效的过滤掉不用进行操作的节点，效率会高一些
XMLEventReader reader = factory.createFilteredReader(
factory.createXMLEventReader(is), new EventFilter() {
@Override
public boolean accept(XMLEvent event) {
// 返回true表示会显示，返回false表示不显示
if (event.isStartElement()) {
String name = event.asStartElement().getName().toString();
if (name.equals("title") || name.equals("price")){
return true;
}
}
return false;
}
});
int num = 0;
while (reader.hasNext()) {
// 通过XMLEvent来获取是否是某种节点类型
XMLEvent event = reader.nextEvent();
if (event.isStartElement()) {
// 通过event.asxxx转换节点
String name = event.asStartElement().getName().toString();
if (name.equals("title")) {
System.out.print(reader.getElementText() + ":");
}
if (name.equals("price")) {
System.out.print(reader.getElementText() + "\n");
}
}
num++;
}
System.out.println(num);
} catch (XMLStreamException e) {
e.printStackTrace();
} finally {
try {
if (is != null)
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Test
public void test06() {
//Xpath: http://blog.csdn.net/jefferxun1/article/details/7805062
InputStream is = null;
try {
is = TestStax.class.getClassLoader().getResourceAsStream("books.xml");
// 创建文档处理对象
DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
// 通过DocumentBuilder创建doc的文档对象
Document doc = db.parse(is);
// 创建XPath
XPath xpath = XPathFactory.newInstance().newXPath();
// 第一个参数就是xpath,第二参数就是文档
//"//book[@category='WEB']"选取所有 book元素，且这些元素拥有值为 WEB的 category属性
NodeList list = (NodeList) xpath.evaluate("//book[@category='WEB']", doc, XPathConstants.NODESET);
for (int i = 0; i < list.getLength(); i++) {
// 遍历输出相应的结果
Element e = (Element) list.item(i);
System.out.println(e.getElementsByTagName("title").item(0).getTextContent());
}
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (XPathExpressionException e) {
e.printStackTrace();
} finally {
try {
if (is != null)
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
@Test
public void test07() {
try {
XMLStreamWriter xsw = XMLOutputFactory.newInstance().createXMLStreamWriter(System.out);
xsw.writeStartDocument("UTF-8", "1.0");
xsw.writeEndDocument();
String ns = "http://11:dd";
xsw.writeStartElement("nsadfsadf", "person", ns);
xsw.writeStartElement(ns, "id");
xsw.writeCharacters("1");
xsw.writeEndElement();
xsw.writeEndElement();
xsw.flush();
xsw.close();
} catch (XMLStreamException e) {
e.printStackTrace();
} catch (FactoryConfigurationError e) {
e.printStackTrace();
}
}
@Test
public void test08() {
InputStream is = null;
try {
is = TestStax.class.getClassLoader().getResourceAsStream("books.xml");
// 创建文档处理对象
DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
// 通过DocumentBuilder创建doc的文档对象
Document doc = db.parse(is);
// 创建XPath
XPath xpath = XPathFactory.newInstance().newXPath();
Transformer tran = TransformerFactory.newInstance().newTransformer();
tran.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
tran.setOutputProperty(OutputKeys.INDENT, "yes");
// 第一个参数就是xpath,第二参数就是文档
//"//book[title='Learning XML']"选取所有 book元素，且这些元素拥有值为 Learning XML的 title属性
NodeList list = (NodeList) xpath.evaluate("//book[title='Learning XML']", doc, XPathConstants.NODESET);
// 获取price节点
Element be = (Element) list.item(0);
Element e = (Element) (be.getElementsByTagName("price").item(0));
e.setTextContent("333.9");
Result result = new StreamResult(System.out);
// 通过tranformer修改节点
tran.transform(new DOMSource(doc), result);
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (XPathExpressionException e) {
e.printStackTrace();
} catch (TransformerConfigurationException e) {
e.printStackTrace();
} catch (TransformerFactoryConfigurationError e) {
e.printStackTrace();
} catch (TransformerException e) {
e.printStackTrace();
} finally {
try {
if (is != null)
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
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