📄 cookieservlet.java

📁 J2EE 技术源码书籍源代码（j2ee编程技术）

💻 JAVA

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/*
 * Created on 2004-6-13
 *
 * To change the template for this generated file go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
package com.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author haoyulong
 *
 * To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
public class CookieServlet extends HttpServlet {
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		//TODO Method stub generated by Lomboz
		Cookie cookie = null;
	      //获取请求相关的cookie
	      Cookie[] cookies = request.getCookies( );
	      boolean newCookie = false;
	    
	      //判断Cookie ServletStudy是否存在
	      if (cookies != null){
	          for (int i = 0; i < cookies.length; i++){
	              if (cookies[i].getName( ).equals("ServletStudy")){
	                  cookie = cookies[i];
	              } 
	          }//end for
	      }//end if
	       
	      if (cookie == null){
	          newCookie=true;
	          
	          int maxAge=10000;
	          //生成cookie对象
	          cookie = new Cookie("ServletStudy","create by hyl");
	          cookie.setPath(request.getContextPath( ));
	          cookie.setMaxAge(maxAge);
	          response.addCookie(cookie);
	        }//end if
	      // 显示信息
	      response.setContentType("text/html");
	      java.io.PrintWriter out = response.getWriter( );
	      out.println("<html>");
	      out.println("<head>");
	      out.println("<title>Cookie Info</title>");  
	      out.println("</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>");

	}
}

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