java中的SAXParser.parse方法在eclipse Mars中不起作用

Question

我已经按照在线教程创建了2个类（子类和主类），通过扩展DefaultHandler类来使用SAX解析器读取XML文件。一切都很好但是当我尝试在Eclipse中编写方法SAXParser.parse(String URI, DefaultHandler object)时，它显示在下面的错误图像。 请帮助我在这里做错了。

public class mainclass{
public static void main(String []args)
{
        DefaultHandler dff=new subclass();
        SAXParserFactory spf=SAXParserFactory.newInstance();
        try
        {
        SAXParser sp=spf.newSAXParser();
        sp.parse("Trial.xml", dff);
    }
    catch(Exception e)
    {
        System.out.println("exception is "+e);
    }
}
}

public class subclass extends DefaultHandler{
boolean bheader=false;
boolean bdetail=false;
boolean blpn=false;

public void startDocument() throws SAXException
{
    System.out.println("Starting the start document method");
}
public void endDocument() throws SAXException
{
    System.out.println("End document method called");
}
public void startElement(String uri,String localName,String qName,Attributes attributes) throws SAXException
{
    System.out.println("Start element method called "+qName);
}
public void endElement(String uri,String localName,String qName) throws SAXException
{
    System.out.println("end element method called "+qName);
}
public void characters(char ch[],int start,int length)
{
    System.out.println("Characters method called "+new String(ch,start,length));
}
}

Answer 1

您正在从错误的包导入DefaultHandler类。你应该导入org.xml.sax.helpers.DefaultHandler