為什么我保存不了賬戶和密碼呢？
和老師的有些不同，我的dologin是servlet寫的
<%@?page?import="java.net.URLDecoder"?%><%--
??Created?by?IntelliJ?IDEA.
??User:?lenovo
??Date:?2020/5/19
??Time:?20:18
??To?change?this?template?use?File?|?Settings?|?File?Templates.
--%>
<%@?page?contentType="text/html;charset=UTF-8"?language="java"?%>
<html>
<head>
????<title>歡迎登錄</title>
</head>
<body>
<h1>用戶登錄</h1>
<hr>
<%
????request.setCharacterEncoding("utf-8");
????String?username="";
????String?password?=?"";
????Cookie[]?cookies?=?request.getCookies();
????if(cookies!=null&&cookies.length>0)
????{
????????for(Cookie?c:cookies)
????????{
????????????if(c.getName().equals("username"))
????????????{
????????????????username?=??URLDecoder.decode(c.getValue(),"utf-8");
????????????}
????????????if(c.getName().equals("password"))
????????????{
????????????????password?=??URLDecoder.decode(c.getValue(),"utf-8");
????????????}
????????}
????}
%>
<form?name="loginForm"?action="servlet/Login"?method="post">
????<table>
????????<tr>
????????????<td?class="label">用戶名：</td>
????????????<td><input?type="text"?name="username"?value="<%=username?%>"/></td>
????????</tr>
????????<tr>
????????????<td?class="label">密碼：</td>
????????????<td><input?type="password"?name="password"?value="<%=password?%>"?/></td>
????????</tr>
????????<tr>
????????????<td?colspan="2"><input?type="checkbox"?name="isUseCookie"?checked="checked"/>十天內(nèi)記住我的登錄狀態(tài)</td>
????????</tr>
????????<tr>
????????????<td?colspan="2"?align="center"><input?type="submit"?value="登錄"/><input?type="reset"?value="取消"/></td>
????????</tr>
????</table>
</form>
</body>
</html>這是jsp頁面代碼
package?servlet;
import?db.Dubtil;
import?model.Users;
import?javax.servlet.ServletException;
import?javax.servlet.http.Cookie;
import?javax.servlet.http.HttpServlet;
import?javax.servlet.http.HttpServletRequest;
import?javax.servlet.http.HttpServletResponse;
import?java.io.IOException;
import?java.net.URLEncoder;
import?java.sql.Connection;
import?java.sql.PreparedStatement;
import?java.sql.ResultSet;
public?class?Login?extends?HttpServlet?{
????Dubtil?dubtil=new?Dubtil();
????@Override
????public?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)?throws?ServletException,?IOException?{
???????????request.setCharacterEncoding("utf-8");
???????????response.setContentType("text/html;charset=utf-8");
???????????Connection?coon=dubtil.getConn();
???????????String?username=request.getParameter("username");
???????????String?password=request.getParameter("password");
????????//首先判斷用戶是否選擇了記住登錄狀態(tài)
????????String[]?isUseCookies?=?request.getParameterValues("isUseCookie");
????????if(isUseCookies!=null&&isUseCookies.length>0)
????????{
????????????//把用戶名和密碼保存在Cookie對象里面
????????????String?username1?=?URLEncoder.encode(request.getParameter("username"),"utf-8");
????????????//使用URLEncoder解決無法在Cookie當(dāng)中保存中文字符串問題
????????????String?password1?=?URLEncoder.encode(request.getParameter("password"),"utf-8");
????????????Cookie?usernameCookie?=?new?Cookie("username",username1);
????????????Cookie?passwordCookie?=?new?Cookie("password",password1);
????????????usernameCookie.setMaxAge(864000);
????????????passwordCookie.setMaxAge(864000);//設(shè)置最大生存期限為10天
????????????response.addCookie(usernameCookie);
????????????response.addCookie(passwordCookie);
????????}
????????else
????????{
????????????Cookie[]?cookies?=?request.getCookies();
????????????if(cookies!=null&&cookies.length>0)
????????????{
????????????????for(Cookie?c:cookies)
????????????????{
????????????????????if(c.getName().equals("username")||c.getName().equals("password"))
????????????????????{
????????????????????????c.setMaxAge(0);?//設(shè)置Cookie失效
????????????????????????response.addCookie(c);?//重新保存。
????????????????????}
????????????????}
????????????}
????????}下面代碼和數(shù)據(jù)庫有關(guān)系，我覺得和cookie應(yīng)該沒有關(guān)系
??try{
???????????????PreparedStatement?p=coon.prepareStatement
???????????????????????("select?*from?teacherpassword?where?username=??and?password=?");
???????????????p.setString(1,username);
???????????????p.setString(2,password);
???????????????ResultSet?re=p.executeQuery();
???????????????if(re.next())
???????????????{
???????????????????request.getRequestDispatcher("/teacher.jsp").forward(request,response);
???????????????}
???????????????else
???????????????{
???????????????????PreparedStatement?p1=coon.prepareStatement("select?*from?studentpassword?where?username=??and?password=?");
???????????????????p1.setString(1,username);
???????????????????p1.setString(2,password);
???????????????????ResultSet?re1=p1.executeQuery();
???????????????????if(re1.next())
???????????????????{
???????????????????????PreparedStatement?p2=coon.prepareStatement("select?*from?student?where?number=?");
???????????????????????p2.setString(1,username);
???????????????????????ResultSet?re2=p2.executeQuery();
???????????????????????re2.next();
???????????????????????Users?user=new?Users();
???????????????????????user.setName(re2.getString("name"));
???????????????????????user.setSex(re2.getString("sex"));
???????????????????????user.setNumber(re2.getString("number"));
???????????????????????user.setEmail(re2.getString("email"));
???????????????????????user.setAddress(re2.getString("address"));
???????????????????????user.setPhonenumber(re2.getString("phonenumber"));
???????????????????????user.setMathscore(re2.getDouble("mathscore"));
???????????????????????user.setChinesescore(?re2.getDouble("chinesescore"));
???????????????????????user.setEnglishscore(re2.getDouble("englishscore"));
???????????????????????request.getSession().setAttribute("studentinformation",user);
???????????????????????request.getRequestDispatcher("/student.jsp").forward(request,response);
???????????????????}
???????????????????else
???????????????????{
???????????????????????request.getRequestDispatcher("/faillogin.jsp").forward(request,response);
???????????????????}
???????????????}
???????????}catch?(Exception?e)
???????????{
???????????????e.printStackTrace();
???????????}
????}
}求大佬指點為什么cookie保存不了密碼和賬戶呢？
2020-05-23
沒看出來問題。。。你搞定了沒？啥問題？