利用请求头开发多端应用

servlet页面

package com.ssyt.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/** * Servlet implementation class UserAgentServlet */
@WebServlet("/ua")
public class UserAgentServlet extends HttpServlet {
    
	private static final long serialVersionUID = 1L;
       
    /** * @see HttpServlet#HttpServlet() */
    public UserAgentServlet() {
    
        super();
        // TODO Auto-generated constructor stub
    }

	/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
		// TODO Auto-generated method stub
		String userAgent = request.getHeader("User-Agent");
		response.setContentType("text/html;charest=utf-8");
		response.getWriter().println(userAgent);
		String output="";
		if(userAgent.indexOf("Windows NT")!=-1) {
    
			output = "<h1>This is PC!</h1>";
		}else if(userAgent.indexOf("iPhone")!=-1  || userAgent.indexOf("Android")!=-1) {
    
			output = "<h1>This is Mobile!</h1>";
		}
		response.getWriter().println(output);
	}

}

网页效果
PC端

移动端