Question

convert XML-file to Text-file in Java or Java Swing

Asked by: Fifian

Hello,
I Have written this code in Java Swing, to convert XML-file to Text-file, but I get just an empty text file, why? could you please help me with that!! it is very urgent !!!!!!!!!!!!!!
import javax.swing.*;
import java.io.*;
import java.util.*;
import java.awt.*;
       
public class Convert {
   
  public static void main(String[] arg) throws IOException{  
    String filnamn = JOptionPane.showInputDialog("Vad heter filen som skall läsas?");
      //Skapa en ström från filen
      BufferedReader inström = new BufferedReader(new FileReader(filnamn));
      String filnamn2 = JOptionPane.showInputDialog("Vad heter filen som skall skrivas?");
      PrintWriter utström = new PrintWriter(new BufferedWriter
                                        (new FileWriter(filnamn2)));
        int radNr = 0;
        int i = 0;
        //Läs filen
           while (true){
            String rad = inström.readLine();
             if (rad == null)
                break;   //end of file
               radNr ++;
             utström.println(rad);
           }
   JOptionPane.showMessageDialog(null, "kopiering är klar");
   utström.close();
  // System.out.flush();
   Scanner sc = new Scanner(System.in);
        JOptionPane.showInputDialog("Vad heter filen som ska ändras till text fil?");
        System.out.flush();
        String namn = sc.next();
        //Öppna filen
        BufferedReader inFil = new BufferedReader(new FileReader(namn));
        //Läs filen och skriv det.
        String rad = inFil.readLine();  
        for (radNr = 0; i < rad.length(); radNr++){
        while ((i = inFil.read()) != -1){
            char c = (char) i;
                switch(c) {
                 case '<':
               if ( c == '<')
                    System.out.print('\u0020');    //
              else {
                   System.out.print(c);                      //inström.skip(60);   //}
              }
               break;
                 case '>':
                  if ( c  == '>')
                    System.out.print('\u0020');
               else {  
                      System.out.print(c);
               }  
                  break;
            case '?':
                  if ( c == '?')
                    System.out.print('\u0020');
               else { System.out.print(c);   }
                  break;
                   case '/':
                  if ( c == '/')
                   System.out.print('\u0020');
            else {  System.out.print(c);  }
                   break;
                   case '}':
                  if ( c == '}')
                   System.out.print('\u0020');
             else { System.out.print(c);   }
                  break;
                  case '{':
                  if ( c == '{')
                System.out.print('\u0020');                                 //utström.print(' ');
               else {
                      System.out.print(c);   }
                  break;
                  default:
                      radNr++;
             }
        }
    }
           
    System.out.print(" ");
    System.out.flush();
   }

Best Regards
Fifian

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Asked On
2007-05-21 at 09:09:11ID22585057
Tags

file

,

java

,

xml

,

convert

,

text

Topics

Java Editors & IDEs

,

Extensible Markup Language (XML)

Participating Experts
4
Points
500
Comments
12

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Answers

 

by: mayankeaglePosted on 2007-05-21 at 14:04:40ID: 19129802

You are just reading lines and putting them into the other file as they are - that is not what you want to do?

 

by: FifianPosted on 2007-05-21 at 14:26:49ID: 19129946

No I want not just to reading lines and putting them into the other file as they are, but I would like to omit the characters as (<, >, ?,...) in the out file and change the file from file.xml to file.txt. could you please help me?

 

by: mayankeaglePosted on 2007-05-21 at 14:46:37ID: 19130034

You can use a regular XML parser to parse the document and then take out the node names and values:

http://www.exampledepot.com/egs/javax.xml.parsers/pkg.html

 

by: objectsPosted on 2007-05-21 at 14:46:41ID: 19130036

       String rad = inFil.readLine();  
        for (radNr = 0; i < rad.length(); radNr++){

looks like u should get rid of that loop

and you're outputting to stdout instead of a file

>                   if ( c == '?')

all those if's also appear redeundant

 

by: mayankeaglePosted on 2007-05-21 at 14:48:40ID: 19130050

the first while loop is where the output is being written to the file:

>> while (true){
>>            String rad = inström.readLine();
>>             if (rad == null)
>>                break;   //end of file
>>               radNr ++;
>>             utström.println(rad);
>>           }

But it looks like no modifications are being done to it!

 

by: FifianPosted on 2007-05-21 at 17:15:42ID: 19130957

I wrote again my code, I succeed to omit a first character "<" from xml file but not others in xml as "</" or "<?" the problem is to transfer file.xml to fil.txt and using just Java or java Swing and not XML parse!! then I can not XML parse!! could you please help and thank you. Here is my code again:

import javax.swing.*;
import java.io.*;
import java.util.*;
import java.awt.*;
import java.lang.*;
       
public class Convert {
   
  public static void main(String[] arg) throws IOException{  
    String filnamn = JOptionPane.showInputDialog("Vad heter XML-filen?");
 
      //Skapa en ström från filen
     BufferedReader inström = new BufferedReader(new FileReader(filnamn));
     PrintWriter utström = new PrintWriter(new BufferedWriter
                                        (new FileWriter("fil.tmp")));
        int radNr = 0;
         //Läs filen
          while (true) {
            String rad = inström.readLine();
             if (rad == null)
                break;   //end of file
               radNr ++;
             utström.println(rad);
           }
    JOptionPane.showMessageDialog(null,"kopiering är klar från "+filnamn+" " + "till"+ " " +"fil.tmp");
    inström.close();
    utström.close();
    inström = new BufferedReader(new FileReader("fil.tmp"));
    utström = new PrintWriter(new BufferedWriter(new FileWriter("Resultat.tmp")));
    int i = 0;
   
        while ((i = inström.read()) != -1){      
       
        String nyRad = "";
        String rad = inström.readLine();  
        int n = 0;
        int m = rad.length()-1;  
        if (i == rad.indexOf("</", rad.length() ))
                    nyRad = rad.substring(n+1,m);
          if( i == rad.indexOf('<', rad.length() ))
              nyRad = rad.substring(n+1,m);
           
             if (i == rad.indexOf('>', rad.length() ))
                   nyRad = rad.substring(n+1,n+1);
                               
               // utström.print(nyRad);
               else
                   if (rad == null)
                       break;
         radNr++;          
            utström.println(rad);
        }
            JOptionPane.showMessageDialog(null, "Allt är klar");
            inström.close();
            utström.close();
            //System.out.flush();
            System.exit(0);
      }
 
    }  
   

 

by: mayankeaglePosted on 2007-05-21 at 18:19:58ID: 19131242

Use a StringBuffer or StringBuilder and try using the replace () or replaceAll () methods - just replace "<" and "/>" with ""

 

by: FifianPosted on 2007-05-22 at 00:04:26ID: 19132144

Sorry mayankeagle, that is dose not work!! thank you. the xml file is look as:
<?xml version="1.0" encoding="ISO-8859-1"?>
<employees>
<employee id="1">
<name>
<fname>Rahul<fname>
<lname>Sapkal</lname>
</name>

 

by: vevexPosted on 2007-05-30 at 23:22:48ID: 19185820

Hi Fifian,
If I got it right, you only problem is as simple as replacing string.
Here's a sample (just copy the html and save into a file, then open it),
<html><head>
<script language="JavaScript">
    function hideStr( tempStr ) {
      var newStr;
      newStr = myReplaceAll( tempStr, "<?", "" );
      newStr = myReplaceAll( newStr, "</", "" );
      newStr = myReplaceAll( newStr, "<", "" );
      newStr = myReplaceAll( newStr, "?>", "" );
      newStr = myReplaceAll( newStr, ">", "" );
        alert( "ori str: " + tempStr + "\n new str: " + newStr );
//         alert( "ori str: " + tempStr + "\n new str: " + tempStr.replaceAll("<?","").replaceAll("</","").replaceAll("<","").replaceAll("?>","").replaceAll(">","") );
    }

    function myReplaceAll( oriStr, findStr, replaceStr ) {
      while ( oriStr.indexOf(findStr) >= 0 ) oriStr = oriStr.replace( findStr, replaceStr );
      return oriStr;
    }
</script>
</head>
<body>
<table>
<tr><td>
&lt;?xml version="1.0" encoding="ISO-8859-1"?&gt;
</td><td><input type="button" value="click" onclick='hideStr("<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>");'></td></tr>
<tr><td>
&lt;employees&gt;
</td><td><input type="button" value="click" onclick='hideStr("<employees>");'></td></tr>
<tr><td>
&lt;name&gt;
</td><td><input type="button" value="click" onclick='hideStr("<name>");'></td></tr>
<tr><td>
&lt;fname&gt;Rahul&lt;fname&gt;
</td><td><input type="button" value="click" onclick='hideStr("<fname>Rahul<fname>");'></td></tr>
<tr><td>
&lt;lname&gt;Sapkal&lt;/lname&gt;
</td><td><input type="button" value="click" onclick='hideStr("<lname>Sapkal</lname>");'></td></tr>
<tr><td>
&lt;/name&gt;
</td><td><input type="button" value="click" onclick='hideStr("</name>");'></td></tr>
</table>
</body>
</html>

I did a string replace in JavaScript (can't use replaceAll in JavaScript). Replace function only replace the first occurance so you have to loop it to simulate replaceAll function
Your code does not make much sense to me, I would do the following:
String nyRad, rad;
while ((i = inström.read()) != -1) {
        rad = inström.readLine();
        if (rad == null) break;
        nyRad = rad.replaceAll( "<?", "" );
        nyRad = nyRad.replaceAll( "</", "" );
        nyRad = nyRad.replaceAll( "<", "" );
        nyRad = nyRad.replaceAll( "?>", "" );
        nyRad = nyRad.replaceAll( ">", "" );
        utström.print(nyRad);
}

Some additional notes: The replaceAll method of the java.lang.String class has an unexpected behavior. Escaped double quotes (\") are unescaped.
If you want the final result to be \"TEST\", your replacement string must be \\\\\"TEST\\\\\". When Java compiles the String, it is stored internally as \\"TEST\\". After the regex engine parses the string, it becomes \"TEST\" before it is appended as the replacement in the output string.

 

by: FifianPosted on 2007-05-31 at 10:25:38ID: 19189967

Hi vevex!
Thank you very much for your comment. It is very kind of you to answer my question. The problem was to write a program in Java, just in Java, Java Swing for example but not in Javascript. I used the replace function but it works just for the first character as "<"  with  space in "<html>" but it dose not replace ">" whic is the last character in "<html>"  and I used substring function too and many ways but all of them were not good.
Thank you again.
Fifian

 

by: dhruvasagarPosted on 2008-04-02 at 15:17:21ID: 21268114

Fifian you simply use replaceAll method as described above by many, but instead of replacing just '<' or '</' etc characters. Use regular expression to replace them, that way it will be easier and require much less piece of code. for eg.)

xml = xml.replaceAll("<\\??\\/?|\\??>", " ");

 

by: dhruvasagarPosted on 2008-04-02 at 15:19:42ID: 21268138

@see

String xml = "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>" +
                                    "<employees>" +
                                    "<employee id='1'>" +
                                    "<name>" +
                                    "<fname>Rahul<fname>" +
                                    "<lname>Sapkal</lname>" +
                                    "</name>";
System.out.println(xml.replaceAll("<\\??\\/?|\\??>", " "));

output :  xml version="1.0" encoding="ISO-8859-1"  employees  employee id='1'  name  fname Rahul fname  lname Sapkal lname  name

20120131-EE-VQP-002

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