Use JSP to read client information

Use JSP to read client information

Read the following code. If you have different requirements, you can easily modify these codes. These codes give you the following:
Company, user name, version, main version, minor version
Operating System (unfinished !), Language, locale, etc.

Create a new JSP file:

Add the following class files to classpath (you need to create the same directory structure -- de. hunsicker. http. util, you can also adjust the package name by yourself .!) :

Package de. hunsicker. http. util;

Import java. util .*;

Import javax. servlet .*;
Import javax. servlet. http .*;

Public class Browser extends HttpServlet
{
Protected HttpServletRequest request;
Protected HttpSession session;

Protected String userAgent;
Protected String company; // Firmenname des Herstellers
Protected String name; // Bezeichnung des Browsers
Protected String version; // Version
Protected String mainVersion; // Hauptversion
Protected String minorVersion; // Unterversion
Protected String OS; // Betriebssystem
Protected String language = \ "de \"; // Sprachcode Standard
Protected Locale locale; // Locale-Objekt mit den aktuellen
// Spracheinstellungen

Private Hashtable supportedLanguages; // Untersttzte Sprachen

Public Browser (HttpServletRequest request, HttpSession session)
{
This. initialize ();
This. request = request;
This. session = session;

This. setUserAgent (this. request. getHeader (\ "User-Agent \"));
This. setCompany ();
This. setName ();
This. setVersion ();
This. setMainVersion ();
This. setMinorVersion ();
This. setOs ();
This. setLanguage ();
This. setLocale ();
}

Public void initialize ()
{
This. supportedLanguages = new Hashtable (2 );

This. supportedLanguages. put (\ "en \",\"\");
This. supportedLanguages. put (\ "de \",\"\");
}

Public void setUserAgent (String httpUserAgent)
{
This. userAgent = httpUserAgent. toLowerCase ();
}

Private void setCompany ()
{
If (this. userAgent. indexOf (\ "msie \")>-1)
{
This. company = \ "Microsoft \";
}
Else if (this. userAgent. indexOf (\ "opera \")>-1)
{
This. company = \ "Opera Software \";
}
Else if (this. userAgent. indexOf (\ "mozilla \")>-1)
{
This. company = \ "Netscape Communications \";
}
Else
{
This. company = \ "unknown \";
}
}

/**
* Liefert den Firmennamen des Herstellers des verwendeten Browsers.
*/
Public String getCompany ()
{
Return this. company;
}

Private void setName ()
{
If (this. company = \ "Microsoft \")
{
This. name = \ "Microsoft Internet Explorer \";
}
Else if (this. company = \ "Netscape Communications \")
{
This. name = \ "Netscape Navigator \";
}
Else if (this. company = \ "Operasoftware \")
{
This. name = \ "Operasoftware Opera \";
}
Else
{
This. name = \ "unknown \";
}
}

/**
* Liefert den Namen des verwendeten Browsers.
*/
Public String getName ()
{
Return this. name;
}

Private void setVersion ()
{
Int tmpPos;
String tmpString;

If (this. company = \ "Microsoft \")
{
String str = this. userAgent. substring (this. userAgent. indexOf (\ "msie \") + 5 );
This. version = str. substring (0, str. indexOf (\";\"));
}
Else
{
TmpString = (this. userAgent. substring (tmpPos = (this. userAgent. indexOf (\ "/\") + 1, tmpPos + this. userAgent. indexOf (\"\"))). trim ();
This. version = tmpString. substring (0, tmpString. indexOf (\"\"));
}
}

/**
* Liefert die Versionsnummer des verwendeten Browsers.
*/
Public String getVersion ()
{
Return this. version;
}

Private void setMainVersion ()
{
This. mainVersion = this. version. substring (0, this. version. indexOf (\".\"));
}

/**
* Liefert die Hauptversionsnummer des verwendeten Browsers.
*/
Public String getMainVersion ()
{
Return this. mainVersion;
}

Private void setMinorVersion ()
{
This. minorVersion = this. version. substring (this. version. indexOf (\ ". \") + 1). trim ();
}

/**
* Liefert die Unterversionsnummer des verwendeten Browsers.
*/
Public String getMinorVersion ()
{
Return this. minorVersion;
}

Private void setOs ()
{
If (this. userAgent. indexOf (\ "win \")>-1)
{
If (this. userAgent. indexOf (\ "windows 95 \")>-1 | this. userAgent. indexOf (\ "win95 \")>-1)
{
This. OS = \ "Windows 95 \";
}
If (this. userAgent. indexOf (\ "windows 98 \")>-1 | this. userAgent. indexOf (\ "win98 \")>-1)
{
This. OS = \ "Windows 98 \";
}
If (this. userAgent. indexOf (\ "windows nt \")>-1 | this. userAgent. indexOf (\ "winnt \")>-1)
{
This. OS = \ "Windows NT \";
}
If (this. userAgent. indexOf (\ "win16 \")>-1 | this. userAgent. indexOf (\ "windows 3. \")>-1)
{
This. OS = \ "Windows 3. x \";
}
}
}

/**
* Liefert den Namen des Betriebssystems.
*/
Public String getOs ()
{
Return this. OS;
}

Private void setLanguage ()
{
String prefLanguage = this. request. getHeader (\ "Accept-Language \");

If (prefLanguage! = Null)
{
String language = null;
StringTokenizer st = new StringTokenizer (prefLanguage ,\",\");

Int elements = st. countTokens ();

For (int idx = 0; idx elements; idx ++)
{
If (this. supportedLanguages. containsKey (language = st. nextToken ())))
{
This. language = this. parseLocale (language );
}
}
}
}

/*
* Hilfsfunktion fr setLanguage ().
*/
Private String parseLocale (String language)
{
StringTokenizer st = new StringTokenizer (language ,\"-\");

If (st. countTokens () = 2)
{
Return st. nextToken ();
}
Else
{
Return language;
}
}

/**
* Liefert das L? Nderürzel der vom Benutzer
* Bevorzugten Sprache.
*/
Public String getLanguage ()
{
Return this. language;
}

Private void setLocale ()
{
This. locale = new Locale (this. language ,\"\");
}

/**
* Liefert ein Locale-Objekt mit der Sprach-Prferenz des verwendeten Browsers
*/
Public Locale getLocale ()
{
Return this. locale;
}
}