javamail1.4 编写发送邮件失败！ 在线等！！！

准备工作： tomcat 5.5+dk1.5,工作正常，javamail1.4 , jaf-1_1-fr.zip
writemail.jsp 在ROOT/mail文件夹下<form method="post" action="sendmail.jsp" name="form1">收件人地址： <input type="text" name="to">主      题：  <input type="text" name="title">内      容：<textarea name="content" cols="70" rows="10"></textarea> <input type="submit" name="Submit" value="提交"></form>
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sendmail.jsp<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*,java.util.*,javax.mail.*,javax.mail.internet.*,javax.activation.*" errorPage="" %>
<%
try{
//接收邮件信息
String to_mail=request.getParameter("to");
String to_title=request.getParameter("title");
to_title=new String(to_title.getBytes("ISO-8859-1"));String to_content=request.getParameter("content");
to_content=new String(to_content.getBytes("ISO-8859-1"));
//接收邮件信息结束//--------建立邮件会话--------
Properties props=new Properties();//也可用Properties props = System. getProperties();
props.put("mail.smtp.host","smtp.126.com");//存储发送邮件服务器的信息
props.put("mail.smtp.auth","true");//同时通过验证
Session s=Session.getInstance(props);//根据属性新建一个邮件会话
s.setDebug(true);//----由邮件会话新建一个消息对象----
MimeMessage message=new MimeMessage(s);//由邮件会话新建一个消息对象//--------设置邮件--------
InternetAddress from=new InternetAddress("[email protected]");
message.setFrom(from);//设置发件人
InternetAddress to=new InternetAddress(to_mail);
message.setRecipient(Message.RecipientType.TO,to);//设置收件人,并设置其接收类型为TO
message.setSubject(to_title);//设置主题
message.setText(to_content);//设置信件内容
message.setSentDate(new Date());//设置发信时间//--------发送邮件--------
message.saveChanges();//存储邮件信息
Transport transport=s.getTransport("smtp");
//--以smtp方式登录邮箱,第一个参数是发送邮件用的邮件服务器SMTP地址,第二个参数为用户名,第三个参数为密码
transport.connect("smtp.126.com","tytymnty","ty11111111");
//发送邮件,其中第二个参数是所有已设好的收件人地址
transport.sendMessage(message,message.getAllRecipients());
transport.close();
%>
<div align="center">
<p>向<%=to_mail%>发送邮件成功!<br>
邮件主题:<%=to_title%><br>
邮件内容:<%=to_content%></p>
</div>
<%
}catch(MessagingException e){
out.println("发送失败!");
}
%>-------------------------------------------------------------------------
localhost.log中的错误信息如下：
严重: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: Unable to compile class for JSP: An error occurred at line: 10 in the jsp file: /mail/sendmail.jsp
The type Date is ambiguous
7: </head>
8: 
9: <body>
10: <%
11: try{
12: //接收邮件信息
13: String to_mail=request.getParameter("to");
Stacktrace:
at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:85)
at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:435)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:298)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:277)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:265)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:564)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:299)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:834)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:640)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1286)
at java.lang.Thread.run(Unknown Source)
------------------------------------------------------------------------以上代码按照书上原封未动录入，但还是出错了。请大家帮忙看看是哪里出问题了！ 小弟在此谢过！