錯誤代碼500
org.apache.jasper.JasperException: An exception occurred processing JSP page /doLogin.jsp at line 34
31: ? ? ? if(isUseCookies!=null&&isUseCookies.length>0){
32: ? ? ? ?//鎶婄敤鎴峰悕鍜屽瘑鐮佷繚瀛樺埌Cookies涓?
33: ? ? ? ?//1鑾峰緱鐢ㄦ埛鍚嶅拰瀵嗙爜
34: ? ? ? ? String username = URLEncoder.encode(request.getParameter("username"),"utf-8");
35: ? ? ? ? String password = URLEncoder.encode(request.getParameter("password"),"utf-8");
36: ? ? ? ?//2鍒涘緩cookies瀵硅薄
37: ? ? ? ?Cookie usernamecookies=new Cookie("username",username);
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:575)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
root cause
java.lang.NullPointerException
java.net.URLEncoder.encode(URLEncoder.java:188)
org.apache.jsp.doLogin_jsp._jspService(doLogin_jsp.java:122)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
note?The full stack trace of the root cause is available in the Apache Tomcat/7.0.68 logs.
看了我的代碼，和老師說的一樣的，哪位大神幫我看看我是哪里錯了
2016-04-20
把dologin的代碼都貼上來看看呢。只看這個問題不太好看出來。
2016-04-20
<%@ page language="java" import="java.util.*,java.net.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
? <head>
? ? <base href="<%=basePath%>">
? ??
? ? <title>My JSP 'doLogin.jsp' starting page</title>
? ??
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0"> ? ?
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
? </head>
??
? <body>
? ?<h1>登陸成功</h1> <br>
? ?<hr><br><br><br>
? ?<%
? ? request.setCharacterEncoding("utf-8");
? ? ? String isUseCookies[] =request.getParameterValues("isUseCookie");
? ? ? if(isUseCookies!=null&&isUseCookies.length>0){
? ? ? ?//把用戶名和密碼保存到Cookies中
? ? ? ?//1獲得用戶名和密碼
? ? ? ? String username = URLEncoder.encode(request.getParameter("username"),"utf-8");
? ? ? ? String password = URLEncoder.encode(request.getParameter("password"),"utf-8");
? ? ? ?//2創(chuàng)建cookies對象
? ? ? ?Cookie usernamecookies=new Cookie("username",username);
? ? ? ?Cookie passwordcookies=new Cookie("passwore",password);
? ? ? ?//3設(shè)置保存時間
? ? ? ?usernamecookies.setMaxAge(846000);
? ? ? ?passwordcookies.setMaxAge(864000); ?//最大保存時間是10天.
? ? ? ?//4保存cookie對象
? ? ? ?response.addCookie(usernamecookies);
? ? ? ?response.addCookie(passwordcookies);
? ? ? }
? ? ? else{
? ? ? ? ?//如沒有選擇保存，則刪除保存
? ? ? ? ?//1先判斷有無保存
? ? ? ? Cookie cookies[]=request.getCookies();
? ? ? if(cookies!=null&&cookies.length>0){
? ? ? ? for(Cookie c:cookies){
? ? ? ? ? if(c.getName().equals("username")||c.getName().equals("pw")){
? ? ? ? ? ? ? ?c.setMaxAge(0);//設(shè)置保存時間為O
? ? ? ? ? ? ? ?response.addCookie(c);
? ? ? ? ? }
? ? ? }
? ? ? ? }
? ? ? }
? ?
? ? %>
? ?<a href="Users.jsp" target="_blank">查看用戶信息</a>
? </body>
</html>