📄 cookieservlet.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 CookieServlet extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
       
		Cookie cookie=null;
		Cookie[] cookies=request.getCookies();
		boolean newCookie=false;
	 
		 //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++)
			{   
			
				if(cookies[i].getName().equals("VisitTimes"))
				{   

					cookie=cookies[i];
				}
			}
		}
		 //不存在，创建cookie
		if(cookie==null)
		{
			newCookie=true;
			int maxAge=10000;
            //create the Cookie Object
			cookie=new Cookie("ServletStuday","create by baby");
			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 Info</TITLE></HEAD>");
		out.println("  <BODY>");
		out.println("    <H2>Information about the cookie named \"ServletStudy\"</H2>");
		out.println("cookie value:"+cookie.getValue()+"<br>");
		if(newCookie)
		{
			out.println("Cookie Max-Age"+cookie.getMaxAge()+"<br>");
			out.println("Cookie Path:"+cookie.getPath()+"<br>");
		}
		out.println("  </BODY>");
		out.println("</HTML>");
		//out.flush();
		//out.close();
		
	}

}

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