javaWEB邮件测试

新建一个工具类：

Mail.java

该类的主要关键点是：1、设置系统属性。也就是你是用什么协议来进行邮件发送的，邮件协议有很多在种，比如impt，smpt，prop等协议，

我现在测试用的是smpt协议，smpt协议里也分为很多种，以为有不同的邮箱QQ，126，新浪等，所以就有不同的smpt系统属性了（注：这些

都可以再网上查到），我用的协议是smpt.qq.com，通过property将它存到map集合里面：props.put("host","smpt.qq.com")

2、准备获取邮件回话对象，通过mail.jar包中Session.getDefaultInstance()来获取回话。

3、准备创建MIME邮件对象，jar包自带的MimeMessage(session)方法

4、设置smtp身份认证：props.put("mail.smtp.auth", "true");

5、定义邮件主题：mimeMsg.setSubject(mailSubject);6、

6、定义邮件内容：bp.setContent("" + mailBody, "text/html;charset=GBK");

7、设置发信人：mimeMsg.setFrom(new InternetAddress(from));

8、定义收信人：mimeMsg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));

9、定义抄送人：mimeMsg.setRecipients(Message.RecipientType.CC, (Address[]) InternetAddress .parse(copyto));

以下是源码：

+ View Code?

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package com.util; import java.util.Properties; import javax.mail.Address; import javax.mail.BodyPart; import javax.mail.Message; import javax.mail.Multipart; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeBodyPart; import javax.mail.internet.MimeMessage; import javax.mail.internet.MimeMultipart;   public class Mail {     private MimeMessage mimeMsg;     private Session session;     private Properties props;     private Multipart mp;           private static String smtp = "smtp.qq.com";// smtp服务器     private static String from = "你的邮箱账号@qq.com";// 邮件显示名称     private static String copyto = "";// 抄送人邮件地址     private static String subject = "找回密码";// 邮件标题     private static String username = "邮箱账号";// 发件人真实的账户名     private static String password = "密码";// 发件人密码           public Mail(String smtp) {         setSmtpHost(smtp);         createMimeMessage();     }     public void setSmtpHost(String hostName) {         System.out.println("设置系统属性：mail.smtp.host=" + hostName);         if (props == null) {             props = System.getProperties();         }         props.put("mail.smtp.host", hostName);     }     public boolean createMimeMessage() {         try {             System.out.println("准备获取邮件会话对象！");             session = Session.getDefaultInstance(props, null);         } catch (Exception e) {             System.out.println("获取邮件会话错误！" + e);             return false;         }         System.out.println("准备创建MIME邮件对象！");         try {             mimeMsg = new MimeMessage(session);             mp = new MimeMultipart();               return true;         } catch (Exception e) {             System.out.println("创建MIME邮件对象失败！" + e);             return false;         }     }       /*定义SMTP是否需要验证*/     public void setNeedAuth(boolean need) {         System.out.println("设置smtp身份认证：mail.smtp.auth = " + need);         if (props == null)             props = System.getProperties();         if (need) {             props.put("mail.smtp.auth", "true");         } else {             props.put("mail.smtp.auth", "false");         }     }     public void setNamePass(String name, String pass) {         username = name;         password = pass;     }       /*定义邮件主题*/     public boolean setSubject(String mailSubject) {         System.out.println("定义邮件主题！");         try {             mimeMsg.setSubject(mailSubject);             return true;         } catch (Exception e) {             System.err.println("定义邮件主题发生错误！");             return false;         }     }       /*定义邮件正文*/     public boolean setBody(String mailBody) {         try {             BodyPart bp = new MimeBodyPart();             bp.setContent("" + mailBody, "text/html;charset=GBK");             mp.addBodyPart(bp);             return true;         } catch (Exception e) {             System.err.println("定义邮件正文时发生错误！" + e);             return false;         }     }       /*设置发信人*/     public boolean setFrom(String from) {         System.out.println("设置发信人！");         try {             mimeMsg.setFrom(new InternetAddress(from)); //发信人             return true;         } catch (Exception e) {             return false;         }     }       /*定义收信人*/     public boolean setTo(String to) {         if (to == null)             return false;         System.out.println("定义收信人！");         try {             mimeMsg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));             return true;         } catch (Exception e) {             return false;         }     }       /*定义抄送人*/     public boolean setCopyTo(String copyto) {         if (copyto == null)             return false;         try {             mimeMsg.setRecipients(Message.RecipientType.CC, (Address[]) InternetAddress                     .parse(copyto));             return true;         } catch (Exception e) {             return false;         }     }       /*发送邮件模块*/     public boolean sendOut() {         try {             mimeMsg.setContent(mp);             mimeMsg.saveChanges();             System.out.println("邮件发送中....");             Session mailSession = Session.getInstance(props, null);             Transport transport = mailSession.getTransport("smtp");             transport.connect((String) props.get("mail.smtp.host"), username, password);             transport.sendMessage(mimeMsg, mimeMsg             .getRecipients(Message.RecipientType.TO));             System.out.println("发送成功！");             transport.close();             return true;         } catch (Exception e) {             System.err.println("邮件失败！" + e);             return false;         }     }       /*调用sendOut方法完成发送*/     public static boolean sendAndCc(String to,String content) {         Mail theMail = new Mail(smtp);         theMail.setNeedAuth(true); // 验证                   if (!theMail.setSubject(subject))             return false;         if (!theMail.setBody(content))             return false;         if (!theMail.setTo(to))             return false;         if (!theMail.setCopyTo(copyto))             return false;         if (!theMail.setFrom(from))             return false;         theMail.setNamePass(username, password);         if (!theMail.sendOut())             return false;         return true;     }             //  public static void main(String[] args) { //                  String smtp = "smtp.qq.com";// smtp服务器 //                  String from = "邮箱账号@.qq.com";// 邮件显示名称 //                  String to = "收件人账号@qq.com";// 收件人的邮件地址，必须是真实地址 //                  String copyto = "";// 抄送人邮件地址 //                  String subject = "测试邮件";// 邮件标题 //                  String content = "你好！这是测试邮件，请不要回复";// 邮件内容 //                  String username = "你的邮箱账号";// 发件人真实的账户名 //                  String password = "密码";// 发件人密码 //                  Mail.sendAndCc(smtp, from, to, copyto, subject, content, username, password); //              } }

 以上代码，经过测试，可以运行成功。注意：

Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/mail/util/LineInputStream
当出现以上错误时，恭喜您已经离接收邮件不远了，否则请您解决好所有的异常后再来看这个帖子。

javax.mail和javax.activation这两个包已经在javaEE5当中属于基础包了，就是JDK中自带了已经，但是里面的方法与现在外面的mail.jar和activation.jar有一些出入，所以初学者在直接copy别人代码的时候往往会出现上面的错误。
废话不多说下面是解决方法
进到

X:\Program Files\MyEclipse 6.5\myeclipse\eclipse\plugins\com.genuitec.eclipse.j2eedt.core_6.5.0.zmyeclipse650200806\data\libraryset\EE_5

这个路径里,可以看到javaee.jar,用rar把这个文件打开,然后进到javax文件夹里,删除mail.jar和activation.jar(我的javaee.jar里，这两个东西是文件夹，总之删掉就OK，不过要注意备份一下)