request获取客户端浏览器的信息

/**
* 获取客户端浏览器信息
* @param request
* @return
*/
private String getBrowser(HttpServletRequest request){
String userAgent = request.getHeader("User-Agent") ;
String user = userAgent.toLowerCase();
String browser="";
if (user.contains("edge"))
{
browser=(userAgent.substring(userAgent.indexOf("Edge")).split(" ")[0]).replace("/", "-");
} else if (user.contains("msie"))
{
String substring=userAgent.substring(userAgent.indexOf("MSIE")).split(";")[0];
browser=substring.split(" ")[0].replace("MSIE", "IE")+"-"+substring.split(" ")[1];
} else if (user.contains("safari") && user.contains("version"))
{
browser=(userAgent.substring(userAgent.indexOf("Safari")).split(" ")[0]).split("/")[0]
+ "-" +(userAgent.substring(userAgent.indexOf("Version")).split(" ")[0]).split("/")[1];
} else if ( user.contains("opr") || user.contains("opera"))
{
if(user.contains("opera")){
browser=(userAgent.substring(userAgent.indexOf("Opera")).split(" ")[0]).split("/")[0]
+"-"+(userAgent.substring(userAgent.indexOf("Version")).split(" ")[0]).split("/")[1];
}else if(user.contains("opr")){
browser=((userAgent.substring(userAgent.indexOf("OPR")).split(" ")[0]).replace("/", "-"))
.replace("OPR", "Opera");
}

} else if (user.contains("chrome"))
{
browser=(userAgent.substring(userAgent.indexOf("Chrome")).split(" ")[0]).replace("/", "-");
} else if ((user.indexOf("mozilla/7.0") > -1) || (user.indexOf("netscape6") != -1)  ||
(user.indexOf("mozilla/4.7") != -1) || (user.indexOf("mozilla/4.78") != -1) ||
(user.indexOf("mozilla/4.08") != -1) || (user.indexOf("mozilla/3") != -1) )
{
browser = "Netscape-?";

} else if (user.contains("firefox"))
{
browser=(userAgent.substring(userAgent.indexOf("Firefox")).split(" ")[0]).replace("/", "-");
} else if(user.contains("rv"))
{
String IEVersion = (userAgent.substring(userAgent.indexOf("rv")).split(" ")[0]).replace("rv:", "-");
browser="IE" + IEVersion.substring(0,IEVersion.length() - 1);
} else
{
browser = "UnKnown, More-Info: "+userAgent;
}
return browser;
}