jsp问题，在线等

java.lang.UnsupportedClassVersionError: com/sun/tools/javac/Main (Unsupported major.minor version 48.0)
好像jdk 1.4不支持 com.sun.tool.javac.Main只支持 sun.tools.javactool.jar中的类，不是标准类，因此没有文档，改动了也不提示。这是sun公司的官方文档说明的。

解决方案 »

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p.s. jdk1.3支持 com.sun.tool.javac.Main
共3个文件index.htm  index.jsp   sql_data.java
能告诉你的邮箱吗？
我曾经调试过，好用的，但是环境可能由点不一样。原码如下“index.htm
<html>
<head>
<title>ｷﾉｺ霖ﾔｰ・/title>
</head>
<body bgcolor="#CCCCFF" vlink="#000000" alink="#666666">
<div align="center">
<p><font size="7">
<b><font size="+6">ｷﾉｺ韆蒄ｾ</font></b>
</font></p>
<form method="post" action="index.jsp">
<table width="75%" align="center" border=1>
<tr>
<td width="30%">
<div align="right">ﾐﾕﾃ・</div>
</td>
<td width="70%">
<input type="text" name="name">
</td>
</tr>
<tr>
<td width="30%">
<div align="right">ｵ釋ﾓﾓﾊｼ:</div>
</td>
<td width="70%">
<input type="text" name="email">
</td>
</tr>
<tr>
<td width="30%">
<div align="right">ｸﾋﾖｳｵﾘﾖｷ:</div>
</td>
<td width="70%">
<input type="text" name="url" value="http://">
</td>
</tr>
<tr>
<td width="30%">
<p>ﾇ・愠ﾔ</p>
</td>
<td width="70%">
<textarea name="body" rows="5" cols="30"></textarea>
</td>
</tr>
<tr>
<td width="30%"> </td>
<td width="70%"> </td>
</tr>
<tr>
<td width="30%"> </td>
<td width="70%">
<table width="75%">
<tr>
<td>
<input type="submit" name="send" value="ﾌ眇ｻ">
</td>
<td>
<input type="reset" name="reset" value="ﾖﾘﾖﾃ">
</td>
</tr>
</table>
</td>
</tr>
</table>
</form>
<hr>
</div>
</body>
</html>
index.jsp
<html>
<head>
</head>
<body>
<%@ page language="java" import="java.sql.*"%>
<%@ page contentType="text/html;charset=gb2312"%>
<jsp:useBean id="sqlbeanaa" class="sql_data.sql_data" scope="session" />
<%! String name,email,url,body,sql; %>
<%
name = request.getParameter("name");
email = request.getParameter("email");
url = request.getParameter("url");
body = request.getParameter("body");
System.out.println(name);
if (name!=""&&email!=""&&body!="")
{
sql="insert into guestbook (name,email,url,body) values('"+name+"','"+email+"','"+url+"','"+body+"')";
sqlbeanaa.executeInsert(sql);
}
else
{
out.print("<b><font color=red>Sorry,Please enter your name,email and body!!!</font></b>");
}
%>
<%
ResultSet RScount = sqlbeanaa.executeQuery("SELECT * FROM guestbook");
int i=0;
while (RScount.next())
{
i++;
}
%>
<%-- <p><a name=see><B>Now,<%= RScount %> Records.</B></a></p> --%>
<p><B>ﾏﾖﾔﾚﾓﾐ<%= i %>  ﾌﾍﾂｼ</B></p>
<%
RScount.close();
i=0;
%>
<p> </p>
<%
ResultSet RS=sqlbeanaa.executeQuery("SELECT * FROM guestbook");
while (RS.next())
{
name=RS.getString("name");
email=RS.getString("email");
url=RS.getString("url");
body=RS.getString("body");
%>
<table border=1 width=80%>
<tr>
<td width=30%>・ｳﾆ:</td><td width=70%><%=name%>
</tr>
<tr>
<td width=30%>ｵ釋ﾓﾓﾊｼ:</td><td width=70%><a href="mailto:<%=email%>"><%=email%></a></td>
</tr>
<tr>
<td width=30%>ｸﾋﾖｳｵﾘﾖｷ:</td><td width=70%><a href="<%=url%>"><%=url%></a></td>
</tr>
<tr>
<td width=30%>ﾄﾚﾈﾝ:</td><td width=70%><%=body%></td>
</tr>
</table>
<hr>
<%
}
RS.close();
%>
</body>
</html>
sql_data.javapackage sql_data;
import java.sql.*;
public class sql_data
{
String sDBDriver = "sun.jdbc.odbc.JdbcOdbcDriver";
String sConnStr = "jdbc:odbc:guestbook";
Connection conn = null;
ResultSet rs = null;
public sql_data()
{
try
{
Class.forName(sDBDriver);
}
catch(java.lang.ClassNotFoundException e)
{
System.err.println("sql_data(): " + e.getMessage());
}
}
public void executeInsert(String sql)
{
try
{
conn = DriverManager.getConnection(sConnStr);
Statement stmt = conn.createStatement();
stmt.executeUpdate(sql);
}
catch(SQLException ex)
{
System.err.println("sql_data.executeUpdate:"+ex.getMessage());
}
}
public ResultSet executeQuery(String sql)
{
rs = null;
try
{
conn = DriverManager.getConnection(sConnStr);
Statement stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
}
catch(SQLException ex)
{
System.err.println("sql_data.executeQuery:"+ex.getMessage());
}
return rs;
}
public void executeDelete(String sql)
{
try
{
conn = DriverManager.getConnection(sConnStr);
Statement stmt = conn.createStatement();
stmt.executeUpdate(sql);
}
catch(SQLException ex)
{
System.err.println("sql_data.executeDelete:"+ex.getMessage());
}
}
}