关于javamail与j2ee5的常遇到的问题

 

 

package com.javamail.test;

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

public class TestJavaMail {

    public static void main(String[] arge) throws Exception {
        String from = "[email protected]";
        String to = "[email protected]";
        String subject = "Test mail";
        String body = "A text mail";
        Properties props = System.getProperties();
        // 设置SMTP邮件服务器：
        props.put("mail.smtp.host", "mail.trendcom.com.cn");
        // SMTP服务器需要验证：
        props.put("mail.smtp.auth", "true");
        //设置邮件传输协议为：smtp
        props.put( "mail.transpost.protocol", "smtp");
        //设置邮件服务器端口
        props.put("mail.smtp.port", "25");
        // 传入用户名和口令：
        Session session = Session.getDefaultInstance(props,
                new PasswordAuthenticator("[email protected]", "pizza"));
        // 创建新邮件：
        Message msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress(from));
        msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to, false));
        msg.setSubject(subject);
        msg.setText(body);
        msg.setSentDate(new Date());
        // 发送：
        Transport.send(msg);
    }
}

class PasswordAuthenticator extends Authenticator {

    private String username;
    private String password;

    public PasswordAuthenticator(String username, String password) {
        this.username = username;
        this.password = password;
    }

    protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(username, password);
    }

}

 

 

package com.javamail.test;

import java.util.*;
import java.io.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;

public class TestJavaMailFile {
 
 public static void main(String[] args) {
  TestJavaMailFile mailFile=new TestJavaMailFile();
  mailFile.setHost("mail.trendcom.com.cn");
  mailFile.setUser("[email protected]");
  mailFile.setPassword("pizza");
  mailFile.setFrom("[email protected]");
  mailFile.setTo("[email protected]");
  mailFile.setSubject("附件邮件");
  mailFile.setText("请主意查收附件");
  mailFile.attachfile("test.doc");
  System.out.println(mailFile.startSend());
 }
 class PasswordAuthenticator extends Authenticator {

     private String username;
     private String password;

     public PasswordAuthenticator(String username, String password) {
         this.username = username;
         this.password = password;
     }

     protected PasswordAuthentication getPasswordAuthentication() {
         return new PasswordAuthentication(username, password);
     }

 }
 // 定义发件人、收件人、主题等
 String user="";
 String password="";
 String to = "";
 String from = "";
 String host = "";
 String filename = "";
 String subject = "";
 String text="";
 // 用于保存发送附件的文件名的集合
 Vector file = new Vector();

 public TestJavaMailFile(){
  
 }

 // 该方法用于收集附件名
 public void attachfile(String fname) {
  file.addElement(fname);
 }

 // 开始发送信件的方法
 public boolean startSend() {
  // 创建Properties对象
  Properties props = System.getProperties();
  // 创建信件服务器
  props.put("mail.smtp.host", host);
      // SMTP服务器需要验证：
        props.put("mail.smtp.auth", "true");
        //设置邮件传输协议为：smtp
        props.put( "mail.transpost.protocol", "smtp");
        //设置邮件服务器端口
        props.put("mail.smtp.port", "25");
  // 得到默认的对话对象
  Session session = Session.getDefaultInstance(props,new PasswordAuthenticator(getUser(),getPassword()));
  try {
   // 创建一个消息，并初始化该消息的各项元素
   MimeMessage msg = new MimeMessage(session);
   msg.setFrom(new InternetAddress(from));
   InternetAddress[] address = { new InternetAddress(to) };
   msg.setRecipients(Message.RecipientType.TO, address);
   msg.setSubject(subject);
   // 后面的BodyPart将加入到此处创建的Multipart中
   Multipart mp = new MimeMultipart();
   // 利用枚举器方便的遍历集合
   Enumeration efile = file.elements();
   // 检查序列中是否还有更多的对象
   while (efile.hasMoreElements()) {
    MimeBodyPart mbp = new MimeBodyPart();
    // 选择出每一个附件名
    filename = efile.nextElement().toString();
    // 得到数据源
    FileDataSource fds = new FileDataSource(filename);
    // 得到附件本身并至入BodyPart
    mbp.setDataHandler(new DataHandler(fds));
    // 得到文件名同样至入BodyPart
    mbp.setFileName(fds.getName());
    mp.addBodyPart(mbp);
   }
   // 移走集合中的所有元素
   file.removeAllElements();
   //创建新的MimeBodyPart
   MimeBodyPart messageBodyPart = new MimeBodyPart();
   //把正文信息附加到MimeBodyPart
   messageBodyPart.setText(text);
   //Multipart添加正文信息
      mp.addBodyPart(messageBodyPart);  
   // Multipart加入到信件
   msg.setContent(mp);
   // 设置信件头的发送日期
   msg.setSentDate(new Date());
   // 发送信件
   Transport.send(msg);
  } catch (MessagingException mex) {
   mex.printStackTrace();
   Exception ex = null;
   if ((ex = mex.getNextException()) != null) {
    ex.printStackTrace();
   }
   return false;
  }
  return true;
 }

 public String getUser() {
  return user;
 }

 public void setUser(String user) {
  this.user = user;
 }

 public String getPassword() {
  return password;
 }

 public void setPassword(String password) {
  this.password = password;
 }

 public String getTo() {
  return to;
 }

 public void setTo(String to) {
  this.to = to;
 }

 public String getFrom() {
  return from;
 }

 public void setFrom(String from) {
  this.from = from;
 }

 public String getHost() {
  return host;
 }

 public void setHost(String host) {
  this.host = host;
 }

 public String getSubject() {
  return subject;
 }

 public void setSubject(String subject) {
  this.subject = subject;
 }

 public String getText() {
  return text;
 }

 public void setText(String text) {
  this.text = text;
 }
}

 

 

测试了一下，不行呀，报Exception in thread "main" javax.mail.MessagingException: Could not connect to SMTP host: mail.sina.com.cn, port: 25;

解决方案:邮件smtp:服务器不正确 

 如果新浪邮件服务器:smtp.sina.com

同样的错误可能是邮件服务器不稳定造成的!

 

 

Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/mail/util/LineInputStream
如果你用myEclipse进行开发的话，运行时可能会出现以下的错误:
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/mail/util/LineInputStream
原因是jar包版本不统一,解决方法如下:

删除Java EE 5 Libraries/javaee.jar/mail里的包有东西.

具体方法如下:
用rar打开X:/Program Files/MyEclipse 6.0/myeclipse/eclipse/plugins/com.genuitec.eclipse.j2eedt.core_6.0.1.zmyeclipse601200710/data/libraryset/EE_5/javaee.jar
,然后删除mail,一切就ok了.