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Retriving request parameters in different languages in servlets

Posted on 2008-10-04
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Last Modified: 2013-11-24
Hi,

I am building HTTP Interface for bulk sms messaging system using servlets as primary technology. It will receive the sms requests from clients and forward it to the Telecome bulk sms gateway. At present the servlets are able to receive request in english languages. But when i try to send parameters in other languages like hindi, marathi, arabic, chinese, etc. the servlet receives the parameters but it comes as ???? while debugging. So what is the problem here?

Code:
String accountName = request.getParameter("accountName");
String password = request.getParameter("password");

Regards,
Nirav Pradhan
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Question by:Nirav_Pradhan
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7 Comments
 
LVL 5

Expert Comment

by:libin_v
ID: 22643829
Use getCharacterEncoding to convert
public String getText(HttpServletRequest request)
{
  String value = request.getParameter("mytext");
 
  try{
    value = new String(value.getBytes(), request.getCharacterEncoding());
  }catch(java.io.UnsupportedEncodingException ex){
    System.err.println(ex);
  }
 
  return value;
}

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Author Comment

by:Nirav_Pradhan
ID: 22643887
I made the changes as you said, but the got the following error which is attachted.




String accountName = new String(request.getParameter("accountName").getBytes(),request.getCharacterEncoding());
String password =  new String(request.getParameter("password").getBytes(),request.getCharacterEncoding());
 
the error code:
 
HTTP Status 500 - 
 
--------------------------------------------------------------------------------
 
type Exception report
 
message 
 
description The server encountered an internal error () that prevented it from fulfilling this request.
 
exception 
 
java.lang.NullPointerException: charsetName
	java.lang.String.<init>(String.java:442)
	java.lang.String.<init>(String.java:516)
	com.maaxsms.servlets.LoginServlet.processRequest(LoginServlet.java:40)
	com.maaxsms.servlets.LoginServlet.doGet(LoginServlet.java:85)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
 
 
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.16 logs.
 
 
--------------------------------------------------------------------------------
 
Apache Tomcat/6.0.16

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LVL 5

Expert Comment

by:libin_v
ID: 22645255
if(request.getCharacterEncoding() == null)
   request.setCharacterEncoding("UTF-8");

Try this set a default CharEncoding
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Author Comment

by:Nirav_Pradhan
ID: 22645590
I tried the suggestion, this time there is no error but the parameter's value is still coming as ????.


if(request.getCharacterEncoding() == null)
    request.setCharacterEncoding("UTF-8");
 
String accountName = new String(request.getParameter("accountName").getBytes(),request.getCharacterEncoding());
String password =  new String(request.getParameter("password").getBytes(),request.getCharacterEncoding());

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Accepted Solution

by:
rainmaker2k earned 500 total points
ID: 22649759
The getBytes method can also take a parameter from which encoding you're starting. As far as I know all browsers send ISO-8859-1 as their default encoding.

So, what you need to for each of those parameters is something like this:
new String(request.getParameter("accountName").getBytes("ISO-8859-1"), "UTF-8")

You might also want to play around with the UTF-8 parameter. Depending on the type of language/characterset, this might need to change.
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Author Closing Comment

by:Nirav_Pradhan
ID: 31503142
Thank you very much. The last solution which you provided, it worked.
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