[求助]这种错误是怎么回事呢？没见过！
06/07/14 21:03:40 javax.servlet.ServletException: null这就是它报的错误。
我debug程序，所有的逻辑都是正确的
但是最后它不转到相应的页面，反而继续执行catch exception
out这个exception它就显示的06/07/14 21:03:40 javax.servlet.ServletException: null
为什么呢？谢谢！！
为了更好的找出问题 我把代码贴一下
package mypackage;
import java.util.*;
import java.util.Date;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.PrintWriter;
import java.io.IOException;
import javax.sql.DataSource;
import java.sql.*;
public class logon extends HttpServlet
{
private static final String CONTENT_TYPE = "text/html; charset=GBK";
public void init(ServletConfig config) throws ServletException
{
super.init(config);
}
/**
* Process the HTTP service request.
*/
public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
Connection conn;
request.setCharacterEncoding("GBK");
Date date=new Date();
long logonTime=date.getTime();
String nickName=request.getParameter("nickName");
byte[] tempbyte=nickName.getBytes("ISO8859-1");
nickName=new String(tempbyte);
boolean canLogon=true;
String pwd=request.getParameter("pwd");
try{
DataSource ds =(DataSource)request.getSession().getServletContext().getAttribute("MyDataSrc");
conn=ds.getConnection();
Statement st=conn.createStatement();
//查看用户名是否存在
ResultSet rs=st.executeQuery("select * from chatuser where nickName='"+nickName+"'");
if (rs.next())
{
String id=rs.getString("id");
String repwd=rs.getString("pwd").trim();
long lastTime=rs.getLong("logonTime");
rs.close();
//登陆成功后 密码会保存15天
if ((logonTime-lastTime)>15*24*3600*1000)
{String sql="update chatuser set logonTime='"+logonTime+"',pwd='"+pwd+"' where nickName='"+nickName+"'";
st.executeUpdate(sql);}
else{
//用户名存在，但是密码错误的情况
if(repwd.compareTo(pwd)!=0)
{canLogon=false;}
else{String sql1="update chatuser set logonTime='"+logonTime+"' where nickName='"+nickName+"'";
st.executeUpdate(sql1); }
}
}
else
{rs.close();
String sql2="insert into chatuser(nickName,pwd,logonTime) values('"+nickName+"','"+pwd+"','"+logonTime+"')";
st.executeUpdate(sql2);}
if(!canLogon)
{request.setAttribute("function","对不起，您的输入有错误！请仔细检查后再试");
request.getSession().getServletContext().getRequestDispatcher("fail.jsp").forward(request,response); }
else
{//累计不同聊天室的人数
int num1=0;
int num2=0;
int num3=0;
String classmate="classmate";
String laugh="laugh";
String program="program";
String sql3="select id from userlist where chatRoom='"+laugh+"'";
rs=st.executeQuery(sql3);
while(rs.next())
{num1++;}
rs.close();
String sql4="select id from userlist where chatRoom='"+classmate+"'";
rs=st.executeQuery(sql4);
while(rs.next())
{num2++;}
rs.close();
String sql5="select id from userlist where chatRoom='"+program+"'";
rs=st.executeQuery(sql5);
while(rs.next())
{num3++;}
rs.close();
request.setAttribute("nickName",nickName);
request.setAttribute("num1",String.valueOf(num1));
request.setAttribute("num2",String.valueOf(num2));
request.setAttribute("num3",String.valueOf(num3));
request.getSession().getServletContext().getRequestDispatcher("logon.jsp").forward(request,response); }
}catch (Exception e)
{
System.out.print(e.toString());}
}
}
代码逻辑都正确，只是到最后它不跳转，而要得到例外。我晕了
麻烦了
[此贴子已经被作者于2006-7-14 21:17:09编辑过]
问题解决了哈！