发布于 2016-07-12 22:24:37 | 155 次阅读 | 评论: 0 | 来源: 网友投递
Java程序设计语言
java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言，是由Sun Microsystems公司于1995年5月推出的Java程序设计语言和Java平台（即JavaEE(j2ee), JavaME(j2me), JavaSE(j2se)）的总称。
各种方法都用过。现在总结一下。 经常记不住，要找资料。现在总结一下。
xml 文件如下：
<?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
<book category="COOKING">
<title lang="en">Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</year>
<price>30.00</price>
<aa>
<bb>
<cc>ccccc</cc>
</bb>
</aa>
</book><book category="CHILDREN">
<title lang="en">Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
<book category="WEB">
<title lang="en">XQuery Kick Start</title>
<author>James McGovern</author>
<author>Per Bothner</author>
<author>Kurt Cagle</author>
<author>James Linn</author>
<author>Vaidyanathan Nagarajan</author>
<year>2003</year>
<price>49.99</price>
</book>
<book category="WEB">
<title lang="en">Learning XML</title>
<author>Erik T. Ray</author>
<year>2003</year>
<price>39.95</price>
</book>
</bookstore>
package sort;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
public class D2 {
/**
* 直接使用DOM解析
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception{
DocumentBuilder sb = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document root = sb.parse(D2.class.getClassLoader().getResourceAsStream("NewFile.xml"));
System.out.println(root.getChildNodes().item(0).getNodeName());
}
}
package sort;import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl;
public class D {
/**
* 使用SAX解析
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
SAXParserFactory factory = SAXParserFactoryImpl.newInstance();
SAXParser parser = factory.newSAXParser() ;
parser.parse(D.class.getClassLoader().getResourceAsStream("NewFile.xml"),
new DefaultHandler(){
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
System.out.println("characters");
}
@Override
public void endDocument() throws SAXException {
// TODO Auto-generated method stub
System.out.println("endDocument");
}
@Override
public void endElement(String uri, String localName,
String qName) throws SAXException {
// TODO Auto-generated method stub
System.out.println("endElement");
}
@Override
public void startDocument() throws SAXException {
// TODO Auto-generated method stub
System.out.println("startDocument");
}
@Override
public void startElement(String uri, String localName,
String qName, Attributes attributes)
throws SAXException {
// TODO Auto-generated method stub
System.out.println("startElement");
}
}) ;
}
}
package sort;import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamReader;
public class D3 {
/**
* 使用XMLStream解析
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
XMLInputFactory xmlFactor = XMLInputFactory.newFactory();
XMLStreamReader reader =
xmlFactor.createXMLStreamReader(D3.class.getClassLoader().getResourceAsStream("NewFile.xml"));
while(reader.hasNext()){
int point = reader.next() ;
switch(point){
case XMLStreamReader.START_ELEMENT :
System.out.println("start_element");
case XMLStreamReader.END_ELEMENT :
// do something...
}
}
}
}
package sort;import org.dom4j.Document;
import org.dom4j.io.SAXReader;
/**
* 使用DOM4j XPATH解析XML (需要加入依赖jar文件)
* @author zhoufeng
*
*/
public class D4 {
public static void main(String[] args) throws Exception{
SAXReader reader = new SAXReader() ;
Document root = reader.read(D4.class.getClassLoader().getResourceAsStream("NewFile.xml"));
/* 选择所有的cc节点 */
System.out.println(root.selectNodes("//cc").size());;
/*选择所有的book节点，并且有子节点author的*/
System.out.println((root.selectNodes("//book[author]").size()));;
/* 选择所有book节点，并且有属性category的 */
System.out.println((root.selectNodes("//book[@category]").size()));;
/* 选择所有book节点，并且有子节点author值为James McGovern ，并且还有category属性节点值为WEB 下面的price节点*/
System.out.println(root.selectNodes("//book[author='James McGovern'][@category='WEB']/price").size());;
}
}