日期:2014-05-17  浏览次数:20875 次

jsp条件判断网页转向问题

这是 loginok.jsp 网页
<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <title><%=request.getServerName() %></title>
  </head>
  
  <body>
  <% request.setCharacterEncoding("GBK");
  String username=request.getParameter("name");
  String password=request.getParameter("pass");
  if(username.equals("小鱼")&&password.equals("123456"))
  {%><jsp:forward page="clock.jsp"/>
  <%}
  /*out.println("欢迎"+username+"成功登陆聊天室系统!");*/
  else response.sendRedirect("login.html");
 
  %>
  
  </body>
</html>

这是 clock.jsp 网页 
<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <title> <%=request.getServerName() %></title>
  </head>
  
  <body>
  <%out.println("当前时间是:"+new Date());
  response.setHeader("Refresh","1");
  %>
  </body>
</html>



为什么会出现
org.apache.jasper.JasperException: An exception occurred processing JSP page /loginok.jsp at line 12

9: <% request.setCharacterEncoding("GBK");
10: String username=request.getParameter("name");
11: String password=request.getParameter("pass");
12: if(username.equals("小鱼")&&password.equals("123456"))
13: {%><jsp:forward page="clock.jsp"/>
14: <%}
15: /*out.println("欢迎"+username+"成功登陆聊天室系统!");*/


Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:553)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:457)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)



------解决方案--------------------
jsp页面不能编译,你打印下用户名是不是传入到这个页面了,一定要保证参数传过来了
------解决方案--------------------
你没有对username和password判断是否空

HTML code

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <title><%=request.getServerName() %></title>
  </head>
  
  <body>
  <% request.setCharacterEncoding("GBK");
  String username=request.getParameter("name");
  String password=request.getParameter("pass");
  if( null!=username&&null!=password&&username.equals("小鱼")&&password.equals("123456"))
  {%><jsp:forward page="clock.jsp"/>
  <%}
  /*out.println("欢迎"+username+"成功登陆聊天室系统!");*/
  else response.sendRedirect("login.html");
 
  %>
  
  </body>
</html>
我的异常网推荐解决方案:An exception occ