java读取xml文件的参数内容 java如何读取xml文件

1.读取XML文件的类：

public class XMLUtils {
private final String DB_XML_FILE = "/XMLSetting.xml";
public Properties getPropertiesFromXML() {
URL url = XMLUtils.class.getResource(dBXMLFILE);
URI uri;
try {
uri = url.toURI();
InputSource xmlfile = new InputSource(uri.getPath());
MyDefaultHandler handler = new MyDefaultHandler ();
SAXParserFactory parserFactory = SAXParserFactory.newInstance();
SAXParser parser = parserFactory.newSAXParser();
parser.parse(xmlfile, handler);
return handler.getProps();
} catch (ParserConfigurationException e) {
System.out.println(e.getMessage());
return null;
} catch (SAXException e) {
System.out.println(e.getMessage());
return null;
} catch (IOException e) {
System.out.println(e.getMessage());
return null;
} catch (URISyntaxException e) {
System.out.println(e.getMessage());
return null;
}
}
}

2.处理XML文件的类：

import java.util.Properties;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import com.app.common.Constants;
public class MyDefaultHandler extends DefaultHandler {
private Properties props;
private String key = "";
private StringBuffer value = new StringBuffer();
public MyDefaultHandler() {
props = new Properties();
}
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
value.append(ch, start, length);
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
props.put(key, value.toString().trim());
}
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
value.delete(0, value.length());
key = attributes.getValue(Constants.KEY);
}
public Properties getProps() {
return this.props;
}
}
3.main：
import java.util.Properties;
public class TestMain {
private static Properties properties = null;
/**
* @param args
*/
public static void main(String[] args) {
XMLUtils utils = new XMLUtils();
properties = utils.getPropertiesFromXML();
if (properties != null) {
System.out.println(properties.getProperty("key1"));
System.out.println(properties.getProperty("key2"));
System.out.println(properties.getProperty("key3"));
}
}
}