java如何读取xml节点元素值？
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java读取xml节点元素，主要使用java提供的解析xml的工具类SAXParserFactory，如下代码：
package xml.xmlreader;
import java.io.File;
import java.net.URL;
import java.util.Properties;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
public class CFGParser {//解析xml文件的工具类
private Properties props;
public Properties getProps() {
return props;
}
public void setProps(Properties props) {
this.props = props;
}
public void parse(String filename) throws Exception
{
CFGHandler handler = new CFGHandler();
SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setNamespaceAware(false);
factory.setValidating(false);
SAXParser parser = factory.newSAXParser();
URL confURL = super.getClass().getClassLoader().getResource(filename);
if (confURL == null) {
System.out.println("Can't find configration file.");
return;
}
try
{
parser.parse(confURL.toString(), handler);
this.props = handler.getProps();
}
finally {
factory = null;
parser = null;
handler = null;
}
}
public void parseFile(String filename)
throws Exception
{
CFGHandler handler = new CFGHandler();
SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setNamespaceAware(false);
factory.setValidating(false);
SAXParser parser = factory.newSAXParser();
File f = new File(filename);
if ((f == null) || (!f.exists()))
return;
try
{
parser.parse(f, handler);
this.props = handler.getProps();
}
finally {
factory = null;
parser = null;
handler = null;
}
}
}
package xml.xmlreader;
import java.util.Properties;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class CFGHandler extends DefaultHandler
{
private Properties props;
private String currentSet;
private String currentName;
private StringBuffer currentValue = new StringBuffer();
public CFGHandler()
{
this.props = new Properties();
}
public Properties getProps() {
return this.props;
}
public void startElement(String uri, String localName, String qName, Attributes attributes)
throws SAXException
{
this.currentValue.delete(0, this.currentValue.length());
this.currentName = qName;
}
public void characters(char[] ch, int start, int length) throws SAXException
{
this.currentValue.append(ch, start, length);
}
public void endElement(String uri, String localName, String qName)
throws SAXException
{
this.props.put(qName.toLowerCase(), this.currentValue.toString().trim());
}
}
xml文件
<?xml version="1.0" encoding="UTF-8"?>
<xml-body>
<refresh_userlist desc="用户列表刷新间隔时间(秒)">6</refresh_userlist>
<refresh_message desc="短消息刷新间隔时间(秒)">10</refresh_message>
<morningbegin desc="上午上班时间">23:00</morningbegin>
<morningend desc="上午下班时间">12:00</morningend>
<afternoonbegin desc="下午上班时间">18:00</afternoonbegin>
</xml-body>
jsp获取各个节点的值：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<jsp:useBean id="cfgp" scope="page" class="xml.xmlreader.CFGParser"></jsp:useBean>
<body>
<%
cfgp.parse("kaoqin.xml");
Properties pro = cfgp.getProps();
String stTime = pro.getProperty("morningbegin");
String edTime = pro.getProperty("morningend");
String afternoonbegin = pro.getProperty("afternoonbegin");
out.println(stTime+"\n"+edTime+"\n"+afternoonbegin);
System.out.println(stTime+"\n"+edTime+"\n"+afternoonbegin);
%>
</body>
</html>
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