编译不通过，请大家帮我看下
<%@page contentType= "text/html; charset=gb2312 " language= "java " import= "java.sql.* " errorPage= " " %>
<html>
<head>
<title> reply </title>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 ">
</head>
<jsp:useBean id= "jezz_mj_reply " scope= "page " class= "wm.bean.DB " />
<body>
<%
String login = (String)session.getAttribute( "login ");
String error= " ";
String id=request.getParameter( "id ");
/*String sql= "select content from liuyan_temp where id= "+id;
ResultSet rs=jezz_mj_reply.executeQuery(sql);
rs.next();
String content=rs.getString( "content ");*/
//String httpfile= " ";
//httpfile=request.getHeader( "REFERER ");
if(login==null)
error+= "非法操作 ";
if(id== " ")
error+= "非法回复 ";
if(error.equals( " "))
{
String sql= "select content from liuyan_temp where id= "+id;
ResultSet rs=jezz_mj_reply.executeQuery(sql);
rs.next();
String content=rs.getString( "content ");
}
else
{
out.print(error);
//response.sendRedirect( "index.jsp ");
}
%>
<form action= "reply " method= "post " name= "rform ">
<table width= "500 " border= "0 " align= "center ">
<tr>
<td align= "center "> 回复留言 </td>
</tr>
<tr>
<td align= "center "> <textarea name= "content " cols= "60 " rows= "10 "> <%=content%> </textarea> </td>
</tr>
<tr>
<td align= "center "> <textarea name= "content_reply " cols= "60 " rows= "10 "> </textarea> </td>
</tr>
<tr>
<td align= "center "> <input name= "sumit " type= "submit " value= "提交 "> </td>
</tr>
</table>
</form>
<%
//rs.close();
jezz_mj_reply.all_close();
%>
</body>
</html>
出错是这个地方 <%=content%> ，提示是这样的content cannot be resolved
不知道我的哪个地方出错了
------解决方案--------------------
String content=rs.getString( "content ");你这个content放在if(error.equals( " "))这个if里面,当if完了,content的作用域就完了,看看基础知识:
改成:
String content=null;
if(error.equals( " "))
{
//其余代码
content=rs.getString( "content ");
//其余代码
}
[解决办法]
明显是作用域的问题。
如果你整个页面都需要用这个变量的话，建议声明成变量
<%!String conten=null;%>
