package filter;
import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class CharsetFilter implements Filter {
    private String encoding;

    public void init(FilterConfig config)
        throws ServletException {
        encoding = config.getInitParameter("requestEncoding");
        if (encoding == null)
            encoding = "UTF-8";
    }

    public void doFilter(ServletRequest request,
        ServletResponse response, FilterChain next)
        throws IOException, ServletException {
        request.setCharacterEncoding(encoding);
        response.setCharacterEncoding(encoding);
        next.doFilter(request, response);
    }

    public void destroy() {
    }
}

<?xml version="1.0" ?>
<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>

   ...

<!--CharsetFilter start-->
<filter>
  <filter-name>Charset Filter</filter-name>
  <filter-class>filter.CharsetFilter</filter-class>
  <init-param>
   <param-name>requestEncoding</param-name>
   <param-value>UTF-8</param-value>
  </init-param>
</filter>
<filter-mapping>
  <filter-name>Charset Filter</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>
<!--CharsetFilter end-->

...

</web-app>

rem Execute Java with the applicable properties
if not "%JPDA%" == "" goto doJpda
  if not "%SECURITY_POLICY_FILE%" == "" goto doSecurity
    %_EXECJAVA% %JAVA_OPTS% %CATALINA_OPTS% %DEBUG_OPTS% -Dfile.encoding=UTF-8 -Dclient.encoding.override=UTF-8  -Djava.endorsed.dirs="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%" -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%" -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% %ACTION%
  goto end
  
  :doSecurity
%_EXECJAVA% %JAVA_OPTS% %CATALINA_OPTS% %DEBUG_OPTS% -Dfile.encoding=UTF-8 -Dclient.encoding.override=UTF-8  -Djava.endorsed.dirs="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%" -Djava.security.manager -Djava.security.policy=="%SECURITY_POLICY_FILE%" -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%" -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% %ACTION%
  goto end

  :doJpda
if not "%SECURITY_POLICY_FILE%" == "" goto doSecurityJpda
%_EXECJAVA% %JAVA_OPTS% %CATALINA_OPTS% -Xdebug -Xrunjdwp:transport=%JPDA_TRANSPORT%,address=%JPDA_ADDRESS%,server=y,suspend=n %DEBUG_OPTS% -Dfile.encoding=UTF-8 -Dclient.encoding.override=UTF-8  -Djava.endorsed.dirs="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%" -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%" -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% %ACTION%
  goto end

  :doSecurityJpda
%_EXECJAVA% %JAVA_OPTS% %CATALINA_OPTS% -Xrunjdwp:transport=%JPDA_TRANSPORT%,address=%JPDA_ADDRESS%,server=y,suspend=n %DEBUG_OPTS% -Dfile.encoding=UTF-8 -Dclient.encoding.override=UTF-8  -Djava.endorsed.dirs="%JAVA_ENDORSED_DIRS%" -classpath "%CLASSPATH%" -Djava.security.manager -Djava.security.policy=="%SECURITY_POLICY_FILE%" -Dcatalina.base="%CATALINA_BASE%" -Dcatalina.home="%CATALINA_HOME%" -Djava.io.tmpdir="%CATALINA_TMPDIR%" %MAINCLASS% %CMD_LINE_ARGS% %ACTION%
  goto end

/**
  * * Convert ISO8859-1 format string (which is the default sent by IE * to
  * the UTF-8 format that the database is in.
  */ 
public String toUTF8(String isoString) { 
    String utf8String = null; 
    if (null != isoString && !isoString.equals("")) { 
        try { 
            byte[] stringBytesISO = isoString.getBytes("ISO-8859-1"); 
            utf8String = new String(stringBytesISO, "UTF-8"); 
        } catch(UnsupportedEncodingException e) { 
        }
    }
}