JavaWeb使用Cookie類比實現自動登入功能(不需使用者名稱和密碼)_java

其中包含兩個jsp檔案，分別為login.jsp和index.jsp

代碼如下:

login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>登入介面</title></head><body><form action="index.jsp" method="post">使用者名稱:<input type="text" name="name"/><input type="submit" value="提交"/></form></body></html>

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>歡迎您</title></head><body><%String name = request.getParameter("name");if(name != null && !name.trim().equals("")){Cookie cookie = new Cookie("name",name);cookie.setMaxAge(30); //設定cookie有效期間為30sresponse.addCookie(cookie);}else{Cookie[] cookies = request.getCookies();if(cookies != null && cookies.length > 0){for(Cookie cookie:cookies){String cookieName = cookie.getName();if("name".equals(cookieName)){String val = cookie.getValue();name = val;}}}}if(name != null && !name.trim().equals("")){out.print("hello: " + name);}else{//否則重新導向到登入介面response.sendRedirect("login.jsp");}%></body></html>

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