Servletはブラウザのヘッダ情報から何のブラウザを使っているかを判断します.

 
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
         test1(request);
		
  
	}
    
	
	private void test1(HttpServletRequest request){
		 //          
		String header=request.getHeader("User-Agent");
		System.out.println("header");
		if (header.toLowerCase().contains("msie")) {
			System.out.println("     IE   ");
		}else if(header.toLowerCase().contains("firefox")){
			System.out.println("          ");
		}else if(header.toLowerCase().contains("chrom")){
			System.out.println("          ");
		}else  {
			System.out.println("          ");
		}
		
	}