如何叫jsp页面输出错误信息？？我生成静态页面的程序有错，我想叫他输出错误信息到网页上以便我改错。

梦魇流莺 2011-01-21 10:00:21

如何叫jsp页面输出错误信息？？我生成静态页面的程序有错，我想叫他输出错误信息到网页上以便我改错
代码：

// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3)
// Source File Name: CreateNewsHtml.java

package com.daqian.news;

import com.daqian.ConnPoolHandler;
import com.daqian.ServletBase;
import java.io.IOException;
import java.io.PrintStream;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

// Referenced classes of package com.daqian.news:
// NewsDao

public class CreateNewsHtml extends ServletBase
{

public CreateNewsHtml()
{
}

public String perform(HttpServletRequest request, HttpServletResponse response)
throws Exception
{
java.sql.Connection conn;
int listsize;
String nextPage;
conn = null;
listsize = 10;
nextPage = "/adminconfig/message.jsp";
try
{
conn = ConnPoolHandler.getConncetion();
NewsDao newsDao = new NewsDao();
newsDao.createNewsHtml(conn, listsize);
nextPage = "/adminconfig/message.jsp";
request.setAttribute("code", "2");
}
catch(Exception e)
{
e.printStackTrace();
request.setAttribute("code", "1");
nextPage = "/adminconfig/message.jsp";
}
ConnPoolHandler.closeConnection(conn);
RequestDispatcher rd = getServletContext().getRequestDispatcher(nextPage);
try
{
System.out.println("befor forward::");
rd.forward(request, response);
System.out.println("after forward::");
}
catch(ServletException e)
{
e.printStackTrace();
}
catch(IOException e)
{
e.printStackTrace();
}
return nextPage;
}
}

...全文