使用Java删除XML标记内的空格

Question

I am getting XML with the following tags. What I do is, read the XML file with Java using Sax parser and save them to database. but it seems that spaces are there after the p tag like below.

     <Inclusions><![CDATA[<p>                                               </p><ul> <li>Small group walking tour</li> <li>Entrance fees</li> <li>Professional guide </li> <li>Guaranteed to skip the long lines</li> <li>Headsets to hear the guide clearly</li> </ul>
                <p></p>]]></Inclusions>

But when we insert the read string to the database(PostgreSQL 8) it is printing bad charactors like below for those spaces.

\\011\\011\\011\\011\\011\\011\\011\\011\\011\\011\\011\\011

• Small group walking tour
• Entrance fees
• Professional guide
• Guaranteed to skip the long lines
• Headsets to hear the guide clearly

\\012\\011\\011\\011\\011\\011

1. I want to know why it is printing bad characters(011\\011) like that ?

2. What is the best way to remove spaces inside XML tags with java? (Or how to prevent those bad characters.)

I have checked samples and most of them with python samples.

This is how the XML reads with SAX in my program,

Method 1

  // ResultHandler is the class that used to read the XML. 
  ResultHandler handler         = new ResultHandler();
   // Use the default parser
  SAXParserFactory factory = SAXParserFactory.newInstance();
    // Retrieve the XML file
    FileInputStream in = new FileInputStream(new File(inputFile)); // input file is XML.
    // Parse the XML input
    SAXParser saxParser = factory.newSAXParser();
    saxParser.parse( in , handler);

This is how the ResultHandler class used to read the XML as Sax parser with Method-1

import org.apache.log4j.Logger;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

// other imports

    class ResultHandler extends DefaultHandler {

        public void startDocument ()
        {
            logger.debug("Start document");         
        }

        public void endDocument ()
        {
            logger.debug("End document");
        }

        public void startElement(String namespaceURI, String localName, String qName, Attributes attribs)
        throws SAXException {           
            strValue = "";      
            // add logic with start of tag. 
        }

        public void characters(char[] ch, int start, int length)
        throws SAXException {
            //logger.debug("characters");
            strValue += new String(ch, start, length);
            //logger.debug("strValue-->"+strValue);
        }

        public void endElement(String namespaceURI, String localName, String qName)
        throws SAXException {           
            // add logic to end of tag. 
        }
    }

So that need to know, how to set setIgnoringElementContentWhitespace(true) or similar with sax parser.

Answer 1

You can try to set for your DocumentBuilderFactory

setIgnoringElementContentWhitespace(true)

because of this:

Due to reliance on the content model this setting requires the parser to be in validating mode

you also need to set

setValidating(true)

Or the str= str.replaceAll("\\\\s+", ""); might as well work

Answer 2

1. I'm also finding an exact answer. But think this will help for u.
   The C/Modula-3 octal notation; vs there meaning in this link
   It says

   • \\011 is for Horizontal tab (ASCII HT)
   • \\012 is for Line feed (ASCII NL, newline)

2. You can replace multiple spaces with one space as follows

   str = str.replaceAll("\\s([\\s])+", " ");