使用JSP读取客户端信息-JSP教程,Jsp/Servlet

作者/出处：blueski编译

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:

<%@ page language="java" import="de.hunsicker.http.util.*"%>
<%
browser eins = new browser(request, session);
out.println(eins.getversion());
%>

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.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;
}
}