我有这段代码,我试图用JAVA Mail API发送邮件。在eclipse中运行这段代码时,我得到的错误是“在该行发现多个注释:重复本地变量会话”。我已经声明会话变量只有一次然后为什么我得到这个错误?为什么我在这里得到“重复的局部变量错误”?
try{
String host="smtp.gmail.com";
String to="[email protected]";
final String user="[email protected]";
final String password="*********";
Properties properties = System.getProperties();
properties.setProperty("mail.smtp.host",host);
properties.put("mail.smtp.auth", "true");
Session session = Session.getDefaultInstance(properties,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(user,password);
}
});
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(user));
message.addRecipient(Message.RecipientType.TO,
new InternetAddress(to));
message.setSubject("Thank you subscriber");
message.setContent("<table><tr><td>Name</td><td>+name+</td></tr><tr><td>Address</td><td>+Addr+</td></tr><tr><td>Age</td><td>+age+</td></tr><tr><td>Qualification</td><td>+Qual+</td></tr><tr><td>Percentage</td><td>+Persent+</td></tr><tr><td>Passout</td><td>+Year+</td></tr></table>","text/html");
Transport.send(message);
System.out.println("message sent....");
}
catch (MessagingException ex) {ex.printStackTrace();}
finally {}
这是我正在使用的servlet。
package com.registration;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class RegistrationController
*/
public class RegistrationController extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public RegistrationController() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String name = request.getParameter("fullname");
String Addr = request.getParameter("address");
String age = request.getParameter("age");
String Qual = request.getParameter("qual");
String Persent = request.getParameter("percent");
String Year = request.getParameter("yop");
if(name.isEmpty()||Addr.isEmpty()||age.isEmpty()||Qual.isEmpty()||Persent.isEmpty()||Year.isEmpty())
{
RequestDispatcher rd = request.getRequestDispatcher("registration.jsp");
out.println("<font color=red>OOPS!! YOU MISSED OUT SOME FIELDS. FILL THEM AGAIN</font>");
rd.include(request, response);
}
else
{
RequestDispatcher rd = request.getRequestDispatcher("home.jsp");
rd.forward(request, response);
}
}
}
将所有这些代码放在它所属的Java源文件中,而不是JSP。在JSP内部,已经有一个名为session的隐式局部变量,代表HTTP会话。 JSP应该没有任何一行Java代码。它们是视图组件,因此只能使用JSP EL,JSTL和其他标记库生成HTML。 –
谢谢@JB Nizet。我意识到JSP不应该拥有JAVA代码。但是因为我很困惑,因为我无法决定将电子邮件发送到servlet的代码的位置,所以我试图将这一切都放到最终的JSP中。我不确定我可以在哪里放置此代码,以便用户提交正确的数据后,他/她会收到一封直接的电子邮件。 – New2Java
那么,请调用方法从doPost()方法的else块发送电子邮件:这是处理提交的方法,广告是您知道提交有效的地方,对吧? –