用java代码发邮件，真是牛啊，可群发，也可发附件

package com.xsl.email; import java.util.Properties; import javax.activation.DataHandler; import javax.activation.FileDataSource; 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 MailUtil { private MimeMessage mimeMsg; // MIME邮件对象 private Session session; // 邮件会话对象 private Properties props; // 系统属性 private boolean needAuth = false; // smtp是否需要认证 private String username = "xiaoshaolong"; // smtp认证用户名和密码 private String password = "5956yixsl"; private Multipart mp; // Multipart对象,邮件内容,标题,附件等内容均添加到其中后再生成MimeMessage对象 /** * */ // public MailUtil() { // setSmtpHost(getConfig.mailHost);// 如果没有指定邮件服务器,就从getConfig类中获取 // createMimeMessage(); // } //构造方法 public MailUtil(String smtp) { setSmtpHost(smtp); createMimeMessage(); } /** * @param hostName * String * */ public void setSmtpHost(String hostName) { System.out.println("设置系统属性：mail.smtp.host = " + hostName); if (props == null) props = System.getProperties(); // 获得系统属性对象 props.put("mail.smtp.host", hostName); // 设置SMTP主机 } /** * @return boolean */ public boolean createMimeMessage() { try { System.out.println("准备获取邮件会话对象！"); session = Session.getDefaultInstance(props, null); // 获得邮件会话对象 } catch (Exception e) { System.err.println("获取邮件会话对象时发生错误！" + e); return false; } System.out.println("准备创建MIME邮件对象！"); try { mimeMsg = new MimeMessage(session); // 创建MIME邮件对象 mp = new MimeMultipart(); return true; } catch (Exception e) { System.err.println("创建MIME邮件对象失败！" + e); return false; } } /** * @param need * boolean */ 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"); } } /** * @param name * String * @param pass * String */ public void setNamePass(String name, String pass) { username = name; password = pass; } /** * @param mailSubject * String * @return boolean */ public boolean setSubject(String mailSubject) { System.out.println("设置邮件主题！"); try { mimeMsg.setSubject(mailSubject); return true; } catch (Exception e) { System.err.println("设置邮件主题发生错误！"); return false; } } /** * @param mailBody * String */ public boolean setBody(String mailBody) { try { BodyPart bp = new MimeBodyPart(); bp.setContent( "<meta http-equiv=Content-Type content=text/html; charset=gb2312>" + mailBody, "text/html;charset=GB2312"); mp.addBodyPart(bp); return true; } catch (Exception e) { System.err.println("设置邮件正文时发生错误！" + e); return false; } } /** * @param name * String * @param pass * String */ public boolean addFileAffix(String filename) { System.out.println("增加邮件附件：" + filename); try { BodyPart bp = new MimeBodyPart(); FileDataSource fileds = new FileDataSource(filename); bp.setDataHandler(new DataHandler(fileds)); bp.setFileName(fileds.getName()); mp.addBodyPart(bp); return true; } catch (Exception e) { System.err.println("增加邮件附件：" + filename + "发生错误！" + e); return false; } } /** * @param name * String * @param pass * String */ public boolean setFrom(String from) { System.out.println("设置发信人！"); try { mimeMsg.setFrom(new InternetAddress(from)); // 设置发信人 return true; } catch (Exception e) { return false; } } /** * @param name * String * @param pass * String */ public boolean setTo(String to) { if (to == null) return false; try { mimeMsg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to)); return true; } catch (Exception e) { return false; } } /** * @param name * String * @param pass * String */ 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; } } /** * @param name * String * @param pass * String */ public boolean sendout() { try { mimeMsg.setContent(mp); mimeMsg.saveChanges(); System.out.println("正在发送邮件...."); 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)); // transport.send(mimeMsg); System.out.println("发送邮件成功！"); transport.close(); return true; } catch (Exception e) { System.err.println("邮件发送失败！" + e); return false; } } /** * Just do it as this */ public static void main(String[] args) { String mailbody = "<meta http-equiv=Content-Type content=text/html; charset=gb2312>" + "你好"; MailUtil themail = new MailUtil("smtp.126.com"); themail.setNeedAuth(true); if (themail.setSubject("标题") == false) return; if (themail.setBody(mailbody) == false) return; if (themail.setTo("451123178@qq.com") == false) return; if (themail.setFrom("xiaoshaolong@126.com") == false) return; if (themail.addFileAffix("d:\\nod32.txt") == false) return; themail.setNamePass("xiaoshaolong", "5956yixsl"); if (themail.sendout() == false) return; } }