JSP Cookie案例

项目目录

web.xml

<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><servlet><description>This is the description of my J2EE component</description><display-name>This is the display name of my J2EE component</display-name><servlet-name>Servlet1</servlet-name><servlet-class>FirstServlet</servlet-class></servlet><servlet><description>This is the description of my J2EE component</description><display-name>This is the display name of my J2EE component</display-name><servlet-name>SecondServlet</servlet-name><servlet-class>SecondServlet</servlet-class></servlet><servlet-mapping><servlet-name>Servlet1</servlet-name><url-pattern>/servlet1</url-pattern></servlet-mapping><servlet-mapping><servlet-name>SecondServlet</servlet-name><url-pattern>/servlet2</url-pattern></servlet-mapping><welcome-file-list><welcome-file>index.html</welcome-file></welcome-file-list> </web-app>

index.html

这个页面用户输入名字后，提交到了servlet1—>FirstServlet里面

<form action="servlet1" method="get">名字:<input type="text" name="userName"/><br/><input type="submit" value="go"/> </form>

FirstSerlvlet.java

这个页面给用户添加cookie，并且go为获取cookie的链接

import java.io.*; import javax.servlet.*; import javax.servlet.http.*;public class FirstServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response){try{response.setContentType("text/html");PrintWriter out = response.getWriter();String n=request.getParameter("userName");out.print("Welcome "+n);Cookie ck=new Cookie("uname",n);//creating cookie objectresponse.addCookie(ck);//adding cookie in the response//creating submit buttonout.print("<form action='servlet2' method='get'>");out.print("<input type='submit' value='go'>");out.print("</form>");out.close();}catch(Exception e){System.out.println(e);}} }

SecondServlet.java

获取到cookie的值

import java.io.*; import javax.servlet.*; import javax.servlet.http.*;public class SecondServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response){try{response.setContentType("text/html");PrintWriter out = response.getWriter();Cookie ck[]=request.getCookies();out.print("Hello "+ck[0].getValue());out.close();}catch(Exception e){System.out.println(e);}}}

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