jsp编程100经典例题

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 os; // Betriebssystem 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.setOs(); } 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(); } // get company's name of browser 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"; } } public String getCompany() { return this.company; } // get name of browser 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"; } } public String getName() { return this.name; } //get version of browser 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(" ")); } } public String getVersion() { return this.version; } // get Os of your computer 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"; } } } public String getOs() { return this.os; } }