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how to get constants from xml in java

Posted on 2006-07-05
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Last Modified: 2010-03-31

                  i have a xml like this;i have java constants file like Constants.DOCUMENT="DOC" so i mention like this xml;
                  <action url="x.jsp?map=Constants.DOCUMENT">Modify</uiName>

in java used DOM then get the url;      in java i want url like this x.jsp?map=DOC;now i am getting x.jsp?map=Constants.DOCUMENT
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Question by:chaitu chaitu
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10 Comments
 
LVL 92

Expert Comment

by:objects
ID: 17040928
not sure I follow, did you want change the xml or after it is extracted??
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Expert Comment

by:Webstorm
ID: 17041082
>>         <action url="x.jsp?map=Constants.DOCUMENT">Modify</uiName>
this is not correct XML.
did you mean :
<action url="x.jsp?map=<%=Constants.DOCUMENT%>"><uiName>Modify</uiName></action>
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LVL 20

Author Comment

by:chaitu chaitu
ID: 17041096
how will u put scriptlet in xml file?
<action url="x.jsp?map=<%=Constants.DOCUMENT%>"><uiName>Modify</uiName></action>

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LVL 92

Expert Comment

by:objects
ID: 17041111
depends how u are generating the xml
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LVL 20

Author Comment

by:chaitu chaitu
ID: 17041123
i write one xml file;in that one node is like this.i am reading the xml file in java  ;after reading i want to url should be url=x.jsp?map=Constants.DOCUMENT
<action url="x.jsp?map=Constants.DOCUMENT">Modify</uiName>
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LVL 92

Expert Comment

by:objects
ID: 17041141
when you write the xml why aren't you then inserting the value of Contants.DOCUMENT
what code do u write it with?
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LVL 13

Expert Comment

by:Webstorm
ID: 17041205
>>       <action url="x.jsp?map=Constants.DOCUMENT">Modify</uiName>

In any case, uiName can't close the action tag ->
  <action url="x.jsp?map=Constants.DOCUMENT"><uiName>Modify</uiName></action>

You can do replacement using class reflection

String getConst(String name)
{
   int i=name.lastIndexOf('.');
   if (i<0) return name;
   try{
      return String.valueOf(
                 Class.forName(name.substring(0,i))
                    .getDeclaredField(name.substring(i+1))
                    .get(null)
               );
   }catch(Exception ex){ /* not found */ return name; }
}

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Author Comment

by:chaitu chaitu
ID: 17041213
whatever value is there in Constants.DOCUMENT,it should come in place of Constants.DOCUMENT;
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Accepted Solution

by:
Webstorm earned 2000 total points
ID: 17041241

Then replace constant value in url :

String replaceUrl(String url)
{
    int s=url.indexOf('?'),i,j;
    while(s>=0)
    {
         s++;
         i=url.indexOf('&',s);
         j=url.indexOf('=',s);
         if ((j>0)&&((i<0)||(j<i)))
         {
             String t=getConst((i<0)?url.substring(j+1):url.substring(j+1,i));
             url=url.substring(0,j+1)+t+((i<0)?"":url.substring(i));
             if (i>=0) i=j+1+t.length();
         }
         s=i;
    }
    return url;
}
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LVL 13

Expert Comment

by:Webstorm
ID: 17043307
:-)
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