📄 cookietrackservlet.java

📁 servlet初学者最好的例子……希望能对大家有所帮助

💻 JAVA

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package servlet;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.Cookie;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@SuppressWarnings("serial")
public class CookieTrackServlet extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
       
		boolean flag=false;
		Cookie cookie=null;
		Cookie[] cookies=request.getCookies();
	    
		 //判断CookieVisitTimes是否存在
		 //如果存在，其值加1
		
		if(cookies!=null)
		{   
			for(int i=0;i<cookies.length;i++)
			{   
				cookie=cookies[0];
				if(cookies[i].getName().equals("VisitTimes"))
				{   
					flag=true;
					break;
				}
			}
		}
		 //不存在，创建cookie
		if(cookie==null || cookies.length==0)
	    {
				
			int maxAge=10000;
	        //create the Cookie Object
			cookie=new Cookie("VisitTimes","1");
			cookie.setPath(request.getContextPath());
			cookie.setMaxAge(maxAge);
			response.addCookie(cookie);
				
		}
			
		//display information
		response.setContentType("text/html;charset=gb2312");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>Cookie跟踪会话</TITLE></HEAD>");
		out.println("  <BODY>");
		out.println("    <H2>您好！</H2>");
		if(flag)
		{   
			String v=cookie.getValue();
			int value=Integer.parseInt(v)+1;
			cookie.setValue(Integer.toString(value));
			response.addCookie(cookie);
			out.println("欢迎您第 "+cookie.getValue()+" 次访问本页面<br>");	
		}
		
		out.println("  </BODY>");
		out.println("</HTML>");
		//out.flush();
		//out.close();
		
	}
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
		     throws ServletException, IOException {
		
		doGet(request,response);
	}

}

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