这段代码有什么问题

Question

我得到编译器错误。任何人都可以调试吗？

import javax.mail.*; 
import javax.mail.internet.*; 
import java.util.*; 
public class SendMail 
{ 
    public static void main(String [] args) 
    { 
    SendMail sm=new SendMail(); 
    sm.postMail("abc@yahoo.com","hi","hello","xyz@gmail.com"); 
    } 

public void postMail(String recipients[ ], String subject, String message , String from) throws MessagingException 
{ 
    boolean debug = false; 

    //Set the host smtp address 
    Properties props = new Properties(); 
    props.put("mail.smtp.host", "webmail.emailmyname.com"); 

    // create some properties and get the default Session 
    Session session = Session.getDefaultInstance(props, null); 
    session.setDebug(debug); 

    // create a message 
    Message msg = new MimeMessage(session); 

    // set the from and to address 
    InternetAddress addressFrom = new InternetAddress(from); 
    msg.setFrom(addressFrom); 

    InternetAddress[] addressTo = new InternetAddress[recipients.length]; 
    for (int i = 0; i < recipients.length; i++) 
    { 
     addressTo[i] = new InternetAddress(recipients[i]); 
    } 
    msg.setRecipients(Message.RecipientType.TO, addressTo); 


    // Optional : You can also set your custom headers in the Email if you Want 
    msg.addHeader("MyHeaderName", "myHeaderValue"); 

    // Setting the Subject and Content Type 
    msg.setSubject(subject); 
    msg.setContent(message, "text/plain"); 
    Transport.send(msg); 
} 
} 

Answer 1

你postMail功能期待的第一个参数，recipients是一个字符串数组，但在你的主要方法，则需要通过一个字符串。编译器告诉您，它无法找到与(String, String, String, String)等参数列表匹配的postMail方法的版本。

尝试调用它像这样代替：

sm.postMail(new String[]{"abc@yahoo.com"},"hi","hello","xyz@gmail.com"); 

另一个想法是让你的postMail方法的重载版本，如果这是您要经常做一些事情。

Answer 2

确保您已将mail.jar和activation.jar包括到您的类路径中。

Answer 3

您必须在manifest file中指定主类。