使用JSP读取客户端信息

　 请阅读以下代码。如果你的使用要求不同，可对这些代码加以很方便的修改。这些代码可以使你获得：
公司company, 用户name，版本version，main version，minor version
操作系统(未完成!)，语言language，locale等。

建立一个新的JSP文件:




请将下列class文件加入classpath (你要建立同样的目录结构-- de.hunsicker.http.util，当然也可以自己调节包的名称。!):




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.vers