java获取客服端信息的方法(系统，浏览器等)
如下所示：
Stringagent=request.getHeader("user-agent");
System.out.println(agent);
StringTokenizerst=newStringTokenizer(agent,";");
st.nextToken();
Stringuserbrowser=st.nextToken();
System.out.println(userbrowser);
Stringuseros=st.nextToken();
System.out.println(useros);
System.out.println(System.getProperty("os.name"));//win2003竟然是winxp？
System.out.println(System.getProperty("os.version"));
System.out.println(System.getProperty("os.arch"));
System.out.println(request.getHeader("user-agent"));//返回客户端浏览器的版本号、类型
System.out.println(request.getMethod());//：获得客户端向服务器端传送数据的方法有get、post、put等类型
System.out.println(request.getRequestURI());//：获得发出请求字符串的客户端地址
System.out.println(request.getServletPath());//：获得客户端所请求的脚本文件的文件路径
System.out.println(request.getServerName());//：获得服务器的名字
System.out.println(request.getServerPort());//：获得服务器的端口号
System.out.println(request.getRemoteAddr());//：获得客户端的ip地址
System.out.println(request.getRemoteHost());//：获得客户端电脑的名字，若失败，则返回客户端电脑的ip地址
System.out.println(request.getProtocol());//：
System.out.println(request.getHeaderNames());//：返回所有requestheader的名字，结果集是一个enumeration（枚举）类的实例
System.out.println("Protocol:"+request.getProtocol());
System.out.println("Scheme:"+request.getScheme());
System.out.println("ServerName:"+request.getServerName());
System.out.println("ServerPort:"+request.getServerPort());
System.out.println("Protocol:"+request.getProtocol());
System.out.println("ServerInfo:"+getServletConfig().getServletContext().getServerInfo());
System.out.println("RemoteAddr:"+request.getRemoteAddr());
System.out.println("RemoteHost:"+request.getRemoteHost());
System.out.println("CharacterEncoding:"+request.getCharacterEncoding());
System.out.println("ContentLength:"+request.getContentLength());
System.out.println("ContentType:"+request.getContentType());
System.out.println("AuthType:"+request.getAuthType());
System.out.println("HTTPMethod:"+request.getMethod());
System.out.println("PathInfo:"+request.getPathInfo());
System.out.println("PathTrans:"+request.getPathTranslated());
System.out.println("QueryString:"+request.getQueryString());
System.out.println("RemoteUser:"+request.getRemoteUser());
System.out.println("SessionId:"+request.getRequestedSessionId());
System.out.println("RequestURI:"+request.getRequestURI());
System.out.println("ServletPath:"+request.getServletPath());
System.out.println("Accept:"+request.getHeader("Accept"));
System.out.println("Host:"+request.getHeader("Host"));
System.out.println("Referer:"+request.getHeader("Referer"));
System.out.println("Accept-Language:"+request.getHeader("Accept-Language"));
System.out.println("Accept-Encoding:"+request.getHeader("Accept-Encoding"));
System.out.println("User-Agent:"+request.getHeader("User-Agent"));
System.out.println("Connection:"+request.getHeader("Connection"));
System.out.println("Cookie:"+request.getHeader("Cookie"));
获得user-agent的值
在ASP.NET中使用Request.Header["User-Agent"]得到浏览器的UserAgent，也可以使用Request.UserAgent来获取；
Java中使用request.getHeader(”User-Agent”)来获得；
PHP中相应使用：$_SERVER[HTTP_USER_AGENT]；
JS中则使用navigator.userAgent来获得（客户端经常使用它来做浏览器兼容）。
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