Regarding reading a file in a jsp

[yekkala krishna]

Hi,

i am able to readthe data in a file(which contains some list of devices) through the following code.
But i need to show this data in a dropdown list after clicking a button in a HTML page.
How can i do that?

import java.io.*;
public class FileRead
{
   public static void main(String args[])
  {
      try{
    // Open the file that is the first
    // command line parameter
    FileInputStream fstream = new FileInputStream("AAN");
    // Get the object of DataInputStream
    DataInputStream in = new DataInputStream(fstream);
        BufferedReader br = new BufferedReader(new InputStreamReader(in));
    String strLine;
    //Read File Line By Line
    while ((strLine = br.readLine()) != null)   {
      // Print the content on the console
      int ind1=strLine.indexOf("+");
      int ind2=strLine.indexOf("#");
      strLine=strLine.substring(ind1+1, ind2);
      System.out.println (strLine);
    }
    //Close the input stream
    in.close();
    }catch (Exception e){//Catch exception if any
      System.err.println("Error: " + e.getMessage());
    }
  }
}

Thanks for your suggestion.

regards,
rama krishna.y

[Devaka Cooray]

Use a java class (not a JSP) to access the File, and store all the items you need to show up in a List or an array. Set that list/array as a request-score attribute when dispatching to the JSP. In your JSP, you can use JSTL for:each tag to iterate over that list/array and display each element as an item in your drop down list.

[yekkala krishna]

Hi Devaka,

Thanks for your suggestion.
Now i am able to see the list in dropdown list in html.

regards,
rama krishna.y

[yekkala krishna]

Hi Devaka,

As we already discuss regarding loading of a file into a dropdown list.
Now in my application i need to load a file according to some option displayed in the dropdown list (contract list). and by clicking some button besides it.
Actually i am extracting contract name and filename from xml using DOM parser and doing viceversa.

//code regarding jsp to load file
<tr>
<td>
List of Contracts
</td>
<td>
<form action='<c:url value="/viewMapTool.html"/>' method="post">
 <select name="contract">
   <c:forEach items='${perspectivetreeMap}'var='contr'>
                         <option value="<c:out value='${contr.key}'/>">
                 <c:out value='${contr.value}'/></option>
   </c:forEach>
 </select>
</td>
</form>
<td>
<!--  <a href='<c:url value="/loadDevices.html"/>'>GetDevices</a>-->
<input type="submit" name="submit" value="GetDevices" onclick="location.href='<c:url value="/loadDevices.html"/>'"/>


</td>
</tr>
<tr>
<td>Choose Device Name</td>
<td>
	<select name="devicename">

		 <c:forEach items='${deviceList}'var='devicelist'>
				 <option><c:out value='${devicelist}'/></option>
	    </c:forEach>

	</select>
</td>
</tr>
</form>

//xml file
<contractname>
     <name>ANGELO AMERICAN</name>
	 <ic-server>SAM-GSAM1</ic-server>
     <fileprefix>/AAN/AAN</fileprefix>
  </contractname>
    <contractname>
     <name>PGL</name>
	 <ic-server>SAM-GSAM1</ic-server>
     <fileprefix>/PGL/PGL</fileprefix>
  </contractname>
    <contractname>
     <name>GSK</name>
	 <ic-server>SAM-GSAM1</ic-server>
     <fileprefix>/GSK/GSK</fileprefix>
  </contractname>

regards,
rama krishna.y

[Devaka Cooray]

I'm not sure if I understand your requirement and the question. Is that viewMapTool.html a static html file? Also I can see a submit button outside your form - was that intentional?