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Java Programming Code Examples

Java > Servlets Code Examples

Getting information regarding the client browser using JSP

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Getting information regarding the client browser using JSP 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"; } } else if (this.userAgent.indexOf("Mac") > -1 ) { if (this.userAgent.indexOf("Mac_PowerPC") > -1 || this.userAgent.indexOf("Mac_PPC") > -1) { this.os = "Macintosh Power PC"; } else if (this.userAgent.indexOf("Macintosh") > -1) { this.os = "Macintosh"; } else { this.os = "Unknown Mac"; } } } /** * 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 Länderkürzel 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; } }