我不知如何调试JSP,JSP出错时不象ASP提示第几行错误,高手大哥们,救救我(100分)

goddy · 2001-02-05

我不知如何调试JSP,JSP出错时不象ASP提示第几行错误
高手大哥们,救救我

goddy · 2001-02-05

源程序如下:

<html>
<head>
<title>
login the first chat room
</title>
</head>
<%@ page import="java.util.Vector" %>
<%@ page contentType="text/html;charset=gb2312" %>
<%@ page import="java.util.Hashtable" %>
<%@ page import="java.util.Date" %>
<%
byte[] username_p;
String username_t=request.getParameter("username");
username_p=username_t.getBytes("ISO8859-1");
String username=new String(username_p);
boolean boolcanlogin=true;
%>
<%
Vector temp=new Vector();
String tempuser;
//*****************************************************************************
temp=(Vector)getServletContext().getAttribute("chat1User");
for(int i=0;i<temp.size();i++)
{
tempuser=temp.elementAt(i).toString();
if(username.equals(tempuser))
{
boolcanlogin=false;
}
}
//*****************************************************************************
if (username.equals(""))
{
boolcanlogin=false;
}
if (username.equals("每一个人"))
{
boolcanlogin=false;
}
if (username.equals("all"))
{
boolcanlogin=false;
}
if (username.length()>8)
{
boolcanlogin=false;
}
//*****************************************************************************
if(boolcanlogin==true)
{
temp.addElement(username);
//如果检查通过则在用户向量中加入新的用户名
getServletContext().setAttribute("chat1User",temp);
session.putValue("username",username);
//设置session记录用户名
//添加欢迎信息到消息向量里
Vector tempmsg=(Vector)getServletContext().getAttribute("chat1Msg");
tempmsg.addElement(""+username+"来了["+request.getRemoteAddr()+"],大家欢迎! ");
getServletContext().setAttribute("chat1Msg",tempmsg);

//输出欢迎页面
out.println("未名聊天室1");
out.println("<hr width='80%' color='#0000FF'>");
out.println("<div align='center'><center>");
out.println("<table border='0' width='86%' height='233'>");
out.println("<tr>");
out.println("<td width='4%' height='23'><img src='new.gif' width='20' height='20'");
out.println("alt='new.gif (970 bytes)'></td>");
out.println("<td width='96%' height='23' bgcolor='#B5B5FF'>各位聊客,欢迎使用本聊天室,本聊天室支持人数无上限,每隔10秒刷新消息队列,每隔</td>");
out.println("</tr>");
out.println("<tr>");－
out.println("<td width='4%' height='13'></td>");
out.println("<td width='96%' height='13' bgcolor='#B5B5FF'>两分钟刷新用户列表,如果用户在四分钟内没有任何动作的话,那么此用户将被注销.</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td width='4%' height='11'><img src='new.gif' width='20' height='20'");
out.println("alt='new.gif (970 bytes)'></td>");
out.println("<td width='96%' height='11' bgcolor='#CACAFF'>本聊天室支持34种动作,31种表情,悄悄话等功能,今后将加入图形化功能,及跳转功能,</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td width='4%' height='7'></td>");
out.println("<td width='96%' height='7' bgcolor='#CACAFF'>新建聊天室等功能.</td>");
out.println(" </tr>");
out.println("<tr>");
out.println("<td width='4%' height='19'><img src='new.gif' width='20' height='20'");
out.println("alt='new.gif (970 bytes)'></td>");
out.println("<td width='96%' height='19' bgcolor='#D2D2FF'>如果你要离开本聊天室,请点击右边窗口内的&quot;关闭&quot;.</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td width='4%' height='20'><img src='new.gif' width='20' height='20'");
out.println("alt='new.gif (970 bytes)'></td>");
out.println("<td width='96%' height='20' bgcolor='#EEEEFF'>如果您有什么批评及建议,请到&quot;三角地&quot;发表文章.</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td width='4%' height='22'><img src='new.gif' width='20' height='20'");
out.println("alt='new.gif (970 bytes)'></td>");
out.println("<td width='96%' height='22' bgcolor='#F4F4FF'>请不要在本聊天室内发表反动言论及对他人进行人身攻击.</td>");
out.println("</tr>");
out.println("</table>");
out.println("</center></div>");
out.println("<a href='main.html' target='_top'>请进</a>");
}
else

{
out.println("<center>用户名相同");
out.println("<a href='login.html'>重新申请ID</a></center>");
}
%>
<%
if (boolcanlogin==true)
{
//用一个哈希表来记录用户在聊天室呆的时间
Hashtable userLife=(Hashtable)getServletContext().getAttribute("userLife");
//用一个哈希表记录在聊用户的IP地址
Hashtable userIP=(Hashtable)getServletContext().getAttribute("userIP");
//取得用户登录时间
Date userTime=new Date();
//记录用户登录时间
userLife.put((String)session.getValue("username"),new Long(userTime.getTime()));
//记录用户IP地址
userIP.put((String)session.getValue("username"),request.getRemoteAddr());
getServletContext().setAttribute("userLife",userLife);
getServletContext().setAttribute("userIP",userIP);
}
%>
<body>
</body>
</html>
Tomcat错误信息如下:
Error: 500
Location: /examples/jsp/chapter10/login.jsp
Internal Servlet Error:
org.apache.jasper.JasperException: Unable to compile class for JSPC:/TOMCAT/jakarta-tomcat/work/localhost_8080%2Fexamples/_0002fjsp_0002fchapter_00031_00030_0002flogin_0002ejsplogin_jsp_14.java:143: ???????
out.println("");?
^
1 ???
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:247)
at org.apache.jasper.runtime.JspServlet.loadJSP(JspServlet.java:413)
at org.apache.jasper.runtime.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:149)
at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:161)
at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:261)
at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:369)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160)
at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)
at java.lang.Thread.run(Unknown Source)

小天 · 2001-02-05

我调试JSP程序时，是一条一条地注释掉语句进行调试的，比较傻

goddy · 2001-02-06

接受答案了.

santgan · 2001-02-06

&lt;!--this file are written by fancy--&gt; 
&lt;html&gt; 
&lt;head&gt; 
&lt;title&gt; 
login the first chat room 
&lt;/title&gt; 
&lt;/head&gt; 
&lt;%@ page import=&quot;java.util.Vector&quot;
%&gt; 
&lt;%@ page contentType=&quot;text/html;charset=gb2312&quot;
%&gt; 
&lt;%@ page import=&quot;java.util.Hashtable&quot;
%&gt; 
&lt;%@ page import=&quot;java.util.Date&quot;
%&gt;
&lt;% 
byte[] username_p; 
String username_t=request.getParameter(&quot;username&quot

; 
username_p=username_t.getBytes(&quot;ISO8859-1&quot

; 
String username=new String(username_p); 
boolean boolcanlogin=true; 
%&gt;
&lt;% 
Vector temp=new Vector(); 
String tempuser;
//***************************************************************************** 
temp=(Vector)getServletContext().getAttribute(&quot;chat1User&quot

; 
for(int i=0;i&lt;temp.size();i++) 
{ 
tempuser=temp.elementAt(i).toString(); 
if(username.equals(tempuser)) 
{ 
boolcanlogin=false; 
} 
} 
//***************************************************************************** 
if (username.equals(&quot;&quot

) 
{ 
boolcanlogin=false; 
}
if (username.equals(&quot;每一个人&quot

) 
{ 
boolcanlogin=false; 
}
if (username.equals(&quot;all&quot

) 
{ 
boolcanlogin=false; 
}
if (username.length()&gt;8) 
{ 
boolcanlogin=false; 
} 
//***************************************************************************** 
if(boolcanlogin==true) 
{ 
temp.addElement(username);
//如果检查通过则在用户向量中加入新的用户名 
getServletContext().setAttribute(&quot;chat1User&quot;,temp); 
session.putValue(&quot;username&quot;,username);
//设置session记录用户名 
//添加欢迎信息到消息向量里 
Vector tempmsg=(Vector)getServletContext().getAttribute(&quot;chat1Msg&quot

; 
tempmsg.addElement(&quot;&lt;font size='2' color='red'&gt;&quot;+username+&quot;来了[&quot;+request.getRemoteAddr()+&quot;],大家欢迎!&lt;/font&gt;&lt;br&gt;&quot

; 
getServletContext().setAttribute(&quot;chat1Msg&quot;,tempmsg); 
 
 
//输出欢迎页面 
out.println(&quot;&lt;p align='center'&gt;&lt;font color='#8080FF'&gt;未名聊天室1&lt;/font&gt;&lt;/p&gt;&quot

; 
out.println(&quot;&lt;hr width='80%' color='#0000FF'&gt;&quot

; 
out.println(&quot;&lt;div align='center'&gt;&lt;center&gt;&quot

; 
out.println(&quot;&lt;table border='0' width='86%' height='233'&gt;&quot