新手遇见的问题~！~高手快来帮忙吧谢谢了

做了个简单的JSP，是对数据库进行插入操作的。list.jsp是显示页面连接到insert.jsp页面 insert.jsp页面action到query.jsp页面在query.jsp里进行插入操作。在query.jsp里面插入数据能反映在数据库里。在list.jsp里也能反映出来。但是不能自动跳转到list.jsp总报500错误。而且在query.jsp里面的response.sendRedirect("err.jsp");语句也没有发挥应有的作用。不知道是为什么。高手快来帮着看看吧~·~谢谢了~~~！！~~
query.jsp代码如下：<%@page contentType="text/html; charset=gb2312" language="java" import="java.sql.*,java.util.*"  %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>插入数据</title>
</head>
<body>
<%! String xuehao,name,sex,age,jiguan,department,url,sql; %>
<%! int i;%>
<%! Connection conn;//定义数据库连接对象 %>
<%! ResultSet rs;//定义结果集对象 %>
<%! Statement stmt;//定义SQL语句对象 %>
<%
  xuehao=request.getParameter("xuehao").trim();
  name=request.getParameter("name").trim();
  name=new String(name.getBytes("ISO-8859-1"));//编码转换
  sex=request.getParameter("sex").trim();
  sex=new String(sex.getBytes("ISO-8859-1"));
  age=request.getParameter("age").trim();
  i=Integer.parseInt(age);
  jiguan=request.getParameter("jiguan").trim();
  jiguan=new String(jiguan.getBytes("ISO-8859-1"));
  department=request.getParameter("department").trim();
  department=new String(department.getBytes("ISO-8859-1"));  if(xuehao.length()!=3){//检查学号的位数
response.sendRedirect("err.jsp");
  }  if(name.equals("")){//检查姓名是否为空
    response.sendRedirect("err.jsp");
  } try{
    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
    url="jdbc:odbc:sun";
conn=DriverManager.getConnection(url,"","");//建立与数据库的连接
stmt=conn.createStatement();
sql="select * from student where xuehao="+" ' "+xuehao+" ' "; rs=stmt.executeQuery(sql);
if(rs.getRow()>0){
  response.sendRedirect("err.jsp");
}

sql="insert into student(xuehao,name,sex,age,jiguan,dept)";

sql=sql+"values('"+xuehao+"','"+name+"','"+sex+"','"+i+"','"+jiguan+"','"+department+"')";

stmt.executeUpdate(sql);
out.println("<font size=3 color=blue>正在处理信息，请稍后......</font><meta http-equiv='refresh' content='2;url=list.jsp'>");
    rs.close();
stmt.close();
conn.close();
  }
  catch(Exception e){
response.sendRedirect("err.jsp");
  }
%>
</body>
</html>

解决方案 »

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运行是500错误--------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception java.lang.IllegalStateException
org.apache.coyote.tomcat5.CoyoteResponseFacade.sendRedirect(CoyoteResponseFacade.java:352)
org.apache.jsp.admin.query_jsp._jspService(query_jsp.java:110)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
org.apache.jsp.admin.query_jsp._jspService(query_jsp.java:110)
Check Log
别用response啦,用<jsp:forward page="err.jsp"/>
可能和
org.apache.coyote.tomcat5.CoyoteResponseFacade.sendRedirect
找到编译后的java文件,看(query_jsp.java:110)
应该就明白了
你再检查一下你的代码有没有错！
我也没有看出什么名堂呢！只是还是用那个<jsp:forward page = "err.jsp" />
这样可能要好一点！
response.sendRedirect("err.jsp");
后面不能再有输出内容，所以在 response.sendRedirect("err.jsp");
后面要加上retrun；

新手遇见的问题~！~高手快来帮忙吧 谢谢了

解决方案 »

新手遇见的问题~！~高手快来帮忙吧谢谢了