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如下所示：
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string agent = request.getheader("user-agent");
system.out.println(agent);
stringtokenizer st = new stringtokenizer(agent,";");
st.nexttoken();
string userbrowser = st.nexttoken();
system.out.println(userbrowser);
string useros = st.nexttoken();
system.out.println(useros);
system.out.println(system.getproperty("os.name")); //win2003竟然是win xp？
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request header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("server name: " + request.getservername() );
system.out.println("server port: " + request.getserverport());
system.out.println("protocol: " + request.getprotocol());
system.out.println("server info: " + getservletconfig().getservletcontext().getserverinfo());
system.out.println("remote addr: " + request.getremoteaddr());
system.out.println("remote host: " + request.getremotehost());
system.out.println("character encoding: " + request.getcharacterencoding());
system.out.println("content length: " + request.getcontentlength());
system.out.println("content type: "+ request.getcontenttype());
system.out.println("auth type: " + request.getauthtype());
system.out.println("http method: " + request.getmethod());
system.out.println("path info: " + request.getpathinfo());
system.out.println("path trans: " + request.getpathtranslated());
system.out.println("query string: " + request.getquerystring());
system.out.println("remote user: " + request.getremoteuser());
system.out.println("session id: " + request.getrequestedsessionid());
system.out.println("request uri: " + request.getrequesturi());
system.out.println("servlet path: " + 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 user agent，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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