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cookie小练习之CookieUtil类编写

具体细节见代码及注释：

package util;import java.net.URLDecoder;import java.net.URLEncoder;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * 此类实现了cookie的添加、删除、查找功能 * */public class CookieUtil {	//方便设置cookie的路径	private static String appName = "/web06";		/**	 * 添加cookie方法	 * @param name  --cookie的名字	 * @param value  --cookie的值	 * @param age    --cookie的生存时间	 * @param response  --响应对象	 */	public static void addCookie(String name,String value,int age,HttpServletResponse response){		try {			//URLEncoder.encode --处理中文编码问题			Cookie c = new Cookie(name,URLEncoder.encode(value,"utf-8"));			c.setMaxAge(age); //设置cookie的生存时间			c.setPath(appName); //设置cookie的路径			response.addCookie(c);		} catch (Exception e) {			e.printStackTrace();		}	}			/**	 * 根据cookie的名字删除cookie	 * @param name  --要删除的cookie的名字	 * @param request  --请求对象	 * @param response --响应对象	 */	public static void deleteCookie(String name,HttpServletRequest request,HttpServletResponse response){		Cookie c1 = new Cookie(name,"");		c1.setMaxAge(0);		c1.setPath(appName);		response.addCookie(c1);	}		/**	 * 根据cookie的名字查找cookie的值	 * @param name    --cookie的名字	 * @param request --请求对象	 * @return   返回对应的value，没有返回null	 */	public static String findCookie(String name,HttpServletRequest request){		String value = null;		Cookie[] cookies = request.getCookies();		if(cookies != null){			for(int i=0;i

package web;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import util.CookieUtil;public class TestCookieUtil extends HttpServlet {	public void service(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		response.setContentType("text/html");		PrintWriter out = response.getWriter();		String value = CookieUtil.findCookie("name",request);		if(value != null){			out.println("value:"+value+" 
");		}else{			CookieUtil.addCookie("name", "zhangsan", 100, response);		}		out.close();	}}

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