import java.io.*;import java.net.InetAddress;import java.util.Properties;import java.util.Date;import javax.mail.*;import javax.mail.internet.*;import javax.activation.*;/** * 這個例子說明了一個可以在局網中跨代理的 email 發送程序 * * <p>Title: </p> * <p>Description: </p> * <p>Copyright: Copyright (c) 2001</p> * <p>Company: </p> * @author unascribed * @version 1.0 */public class Email4 {    public static void main(String[] argv) {        new Email4(argv);    }    public Email4(String[] argv) {      //收件人      String to = null;      //發件人      String from = null;      //主題      String subject = null;      //抄送人      String cc = null;      //暗抄送      String bcc = null;      // mail 主機      String mailhost = null;      // mail 內容      String content = null;      //MIME郵件對象      MimeMessage mimeMsg = null;      //郵件會話對象      Session session = null;      try {        mailhost = "wangshuai";        from	 = "from@wangshuai";        to	 = "to@wangshuai";        subject	 = "您好";        content  = "可以跨代理";        Properties props = System.getProperties();  //獲得系統屬性        //設置代理主機的參數        props.put( "http.proxySet", "true" );        props.put( "http.proxyHost", "172.28.2.1" );        props.put( "http.proxyPort", "85");        props.put("mail.smtp.host", mailhost);      //設置SMTP主機        //獲得郵件會話對象        session = Session.getDefaultInstance(props,null);        //創建MIME郵件對象        mimeMsg = new MimeMessage( session );        //設置發信人        mimeMsg.setFrom(new InternetAddress( from ) );        //設置收信人        if(to!=null){           mimeMsg.setRecipients( Message.RecipientType.TO, InternetAddress.parse( to ) );        }        //設置抄送人        if(cc!=null){           mimeMsg.setRecipients( Message.RecipientType.CC, InternetAddress.parse( cc ) );        }        //設置暗送人        if(bcc!=null){           mimeMsg.setRecipients( Message.RecipientType.BCC, InternetAddress.parse( bcc ) );        }        //設置郵件主題        mimeMsg.setSubject(subject,"GBK");        //設置郵件內容        mimeMsg.setText( content ,"GBK" );        //發送日期        mimeMsg.setSentDate(new Date());        //發送郵件        Transport.send( mimeMsg );        System.out.println( "email send！");      } catch (Exception e) {        e.printStackTrace();      }    }}