text file to xml conversion java

  import java.io.BufferedReader;
  import java.io.FileOutputStream;
  import java.io.FileReader;
  import java.util.regex.Pattern;
  import org.xml.sax.ContentHandler;
  import com.sun.org.apache.xml.internal.serialize.OutputFormat;
  import com.sun.org.apache.xml.internal.serialize.XMLSerializer;
  import com.sun.xml.internal.bind.util.AttributesImpl;
  public class Item  {
  public static void main (String args[]) {
  item.readWrite("juin17.part","test.xml");
  }

  public static void readWrite(String fromFile, String toFile)  
  {
try{
    Pattern p = Pattern.compile(".+@.+\\.[a-z]+");
    BufferedReader in = new BufferedReader(new FileReader(fromFile));
    FileOutputStream fos = new FileOutputStream(toFile);
    OutputFormat of = new OutputFormat("XML","windows-1250",true);
    of.setIndent(1);
    of.setIndenting(true);
    XMLSerializer serializer = new XMLSerializer(fos,of);
    ContentHandler hd = serializer.asContentHandler();
    hd.startDocument();
    AttributesImpl atts = new AttributesImpl();
    hd.startElement("","","CONTACTS",atts);
    String line = null,tag;
    while ((line=in.readLine())!=null) {
        if(line.equals("Contact")){
            line=in.readLine();
            hd.startElement("","","CONTACT",atts);
            int i=0;
            while(!line.equals("Contact")){
                if(i==0)
                    tag="FirstName";
                else if(i==1)
                    tag="LastName";
                else{
                    if(p.matcher(line).matches())
                        tag="EMail";
                    else
                        tag="URL";
                }
                hd.startElement("","",tag,atts);
                hd.characters(line.toCharArray(),0,line.length());
                hd.endElement("","",tag);
                i++;
                line=in.readLine();
            }
            hd.endElement("","","CONTACT");
        }
    }
    hd.endElement("","","CONTACTS");
    hd.endDocument();
    fos.close();
    in.close();
    }catch(Exception E){
        System.out.println("Cannot Generate XML!!!");
    }

  }
  }

    public static void readFile(File file)  {
    Scanner freader = new Scanner(file);
    String line = null;
    while (freader.hasNextLine()) {
        line = freader.nextLine();
       if(line==contact){
    Item item = new item();
        item.Name =freader.nextLine();
        item.LName =freader.nextLine();
        item.Email =freader.nextLine();
        freader.nextLine();
        }
        itemList.add(item);
    }
    freader.close();  
   }

This will help you read a file. Here Item is a class with {Name,LName, Email}, itemList is an array list, so, first part I read the file and store it in an array list, then use the arrayList to create the XML file. Try merging both ie reading and writing into XML at the same time.

1. You need a loop to read the file line by line, I'd suggest a BufferedReader for this.

2. Inside the loop you are checking for sequences of lines that start and end with 'Contact'. Each of these will be an XML Element. Within those sequences you can create XML Elements for each of the data items, i.e. Firstname, Secondname, Email, URL.

3. You can check to see if a line is an email address by trying to create an InternetAddress using it. You can check to see if a line is a URL by trying to create a URL from it.

4. There are two strategies for writing the XML output. The easiest would be to build the whole XML document in memory and then write it to file once the input file has been fully read. If your input file is very large this might not be practical and you might need to write each contact Element to an output stream before starting on the next.