How to obtain the client's browser and operating system information in the JSP __JS

String agent = Request.getheader ("user-agent");
StringTokenizer st = new StringTokenizer (agent, ";");
St.nexttoken ();
Get the user's browser name
String userbrowser = St.nexttoken ();
Get the user's operating system name
String Useros = St.nexttoken ();

You can also get information about this machine:

Operating System Information
System.getproperty ("Os.name"); Win2003 unexpectedly is Win XP.
System.getproperty ("Os.version");
System.getproperty ("Os.arch");
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Request.getheader ("User-agent")

and send a red envelope.
Request.getheader ("User-agent") returns the version number, type of the client browser

GetHeader (string name): Gets the header information for the HTTP protocol definition for the delivery file.

Request. GetMethod (): Get the client to the server side of the data transfer method has get, post, put and other types

Request. Getrequesturi (): Gets the client address that issued the request string

Request. Getservletpath (): Gets the file path of the script file requested by the client

Request. getServerName (): Get the name of the server

Request.getserverport (): Get the port number of the server

REQUEST.GETREMOTEADDR (): Obtain the client's IP address

Request.getremotehost (): Get the name of the client computer, if it fails, return the IP address of the client computer

Request.getprotocol ():

Request.getheadernames (): Returns the name of all request headers, and the result set is an instance of a enumeration (enumerated) class

Request.getheaders (string name): Returns all values for the request header of the specified name, and the result set is an instance of a enumeration (enumeration) class