使用JSP讀取客戶端信息
2020-07-27 21:49:01
供稿：網友
使用JSP讀取客戶端信息
請閱讀以下代碼。如果你的使用要求不同，可對這些代碼加以很方便的修改。這些代碼可以使你獲得：
公司company, 用戶name，版本version，main version，minor version
操作系統(未完成!)，語言language，locale等。
建立一個新的JSP文件:
請將下列class文件加入classpath (你要建立同樣的目錄結構-- de.hunsicker.http.util，當然也可以自己調節包的名稱。!):
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?nderkürzel 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;
}
}
