参考如下程序发送email:
import java.io.*;
import sun.net.smtp.SmtpClient;

public class mail
{
   public void sendmail(String to,String subject,String content)
   {
       String from="xxxx@xxxx.xxx";
       try
       {
          SmtpClient client = new SmtpClient("mail.3wins.com");
          client.from(from);
          client.to(to);
          PrintStream message = client.startMessage();
          message.println("To: " + to);
          message.println("Subject: "+subject);
          message.println(content);
          message.println();
          client.closeServer();
       }
       catch (IOException e)
       {
          System.out.println("ERROR SENDING EMAIL:"+e);
       }
   }
}
在jsp中调用此javabean，中文发送到的全是乱码，
用了String(str.getBytes(),"GB2312")也没用，请教！！！

在jsp中转换（像下面这样！）
String from=request.getParameter("from");
String to=(String)request.getParameter("to");
String subject=(String)request.getParameter("subject");
String text=(String)request.getParameter("text");

from=new String(from.getBytes("8859_1"));
to=new String(to.getBytes("8859_1"));
subject=new String(subject.getBytes("8859_1"));
text=new String(text.getBytes("8859_1"));