email.java

java的简单例子

package jws.net;

// Copyright 1997, John Webster Small
// All rights Reserved

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.text.*;
import jws.awt.*;

public class Email implements Serializable
{
  protected String from, to, cc, bcc, subject;
  protected String date;
  protected Vector body;
  protected String msgID, replyTo;
  protected Vector received;
  protected Vector extensions;
  protected Vector other;

  private Vector cloneOriginal()
  {
    Vector cloneBody = new Vector();
    cloneBody.addElement("");
    cloneBody.addElement("");
    cloneBody.addElement("----------");
    cloneBody.addElement("> From: " + from);
    cloneBody.addElement("> To: " + to);
    cloneBody.addElement("> Subject: " + subject);
    cloneBody.addElement("> Date: " + date);
    cloneBody.addElement(">");
    Enumeration e = body.elements();
    while (e.hasMoreElements())
      cloneBody.addElement("> " + (String)e.nextElement());
    return cloneBody;
  }

  public Email replyTo(boolean includeOriginal)
  {
    Email email = new Email();
    email.setTo(from);
    email.setFrom(to);
    email.setSubject("Re: " + subject);
    if (includeOriginal)
      email.body = cloneOriginal();
    return email;
  }

  private boolean includeOriginalDialog
    (Frame parent, String title)
  {
    final WinDialog wd = new WinDialog(parent,title,true);
    wd.add("Center", new Label("Include original text?"));
    Panel p = new Panel();
    Button b = new Button("Yes");
    p.add(b);
    b.addActionListener
      (
        new ActionListener()
        {
          public void actionPerformed(ActionEvent e)
            { wd.dispose(true); }
        }
      );
    p.add(b = new Button("No"));
    b.addActionListener
      (
        new ActionListener()
        {
          public void actionPerformed(ActionEvent e)
            { wd.dispose(); }
        }
      );
    wd.add("South",p);
    wd.pack();
    wd.setVisible(true);
    return wd.ok;
  }

  public Email replyTo(Frame parent)
  {
    return replyTo(includeOriginalDialog(parent,"Reply to"));
  }

  public Email replyToAll(boolean includeOriginal)
  {
    Email email = replyTo(includeOriginal);
    email.setCc(cc);
    if (includeOriginal)
      email.body = cloneOriginal();
    return email;
  }

  public Email replyToAll(Frame parent)
  {
    return replyToAll(includeOriginalDialog(parent,"Reply to all"));
  }

  public Email forward()
  {
    Email email = new Email();
    email.setFrom(to);
    email.setSubject("Fw: " + subject);
    email.body = cloneOriginal();
    return email;
  }

  /** Stip Internet Message Format address of phrase
   * and/or comments.
   * <P><CODE>
   *  Address
   *  Phrase "<" Address ">"
   * </CODE><P>
   * Recall that comments can be set off in header by
   * parentheses.
   */
  public static String addressee(String address)
  {
    StringTokenizer st = new StringTokenizer(address," \t");
    if (st.countTokens() > 1)
      while (st.hasMoreTokens())
      {
        String s = st.nextToken();
        if (s.startsWith("("))
          while (st.hasMoreTokens())
            if (st.nextToken().indexOf(")") >= 0)
              break;
        if (s.startsWith("<"))
          return s.substring(1,s.length()-2);
      }
    return address;
  }

  public String getFrom() { return from; }

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

  private static String[] toStringArray(StringTokenizer st)
  {
    String[] ret = new String[st.countTokens()];
    for (int i = 0; st.hasMoreTokens(); i++)
      ret[i] = st.nextToken();
    return ret;
  }

  public String[] getTo()
  {
    return toStringArray(new StringTokenizer(to,","));
  }

  public String getToAsString()
    { return to; }

  public void setTo(String to)
  {
    if (to == null)
      this.to = "";
    else 
      this.to = to;
  }

  public String[] getCc()
  {
    return toStringArray(new StringTokenizer(cc,","));
  }

  public String getCcAsString()
    { return cc; }

  public void setCc(String cc)
  {
    if (cc == null)
      this.cc = "";
    else 
      this.cc = cc;
  }

  public String[] getBcc()
  {
    return toStringArray(new StringTokenizer(bcc,","));
  }

  public String getBccAsString()
    { return bcc; }

  public void setBcc(String bcc)
  {
    if (bcc == null)
      this.bcc = "";
    else 
      this.bcc = bcc;
  }

  public String getSubject()
    { return subject; }

  public void setSubject(String subject)
  {
    if (subject == null)
      this.subject = "";
    else 
      this.subject = subject;
  }

  public String getDate()
  {
    if (date.length() == 0)
      postMark();
    return date;
  }

  public void postMark()
  {
    SimpleDateFormat df
      = new SimpleDateFormat
        ("EE, dd MMM yyyy HH:mm:ss zz");
    Date d = new Date();
    date = df.format(new Date());
    msgID = String.valueOf(d.getTime());
    int i = from.indexOf("@");
    if (i >= 0)
      msgID = msgID + from.substring(i);
    else
      msgID = msgID + "@" + from;
  }

  public Enumeration getHeaders()
  {
    Vector headers = new Vector();
    if (received != null)
      for (int i = 0; i < received.size(); i++)
        headers.addElement("Received: " + received.elementAt(i));
    if (to.length() > 0)
      headers.addElement("To: " + to);
    if (from.length() > 0)
      headers.addElement("From: " + from);
    if (replyTo.length() > 0)
      headers.addElement("Reply-To: " + replyTo);
    if (date.length() == 0)
      postMark();
    headers.addElement("Date: " + date);
    headers.addElement("Message-ID: <" + msgID + ">");
    if (cc.length() > 0)
      headers.addElement("Cc: " + cc);
    if (extensions != null)
      for (int i = 0; i < extensions.size(); i++)
        headers.addElement(extensions.elementAt(i));
    if (other != null)
      for (int i = 0; i < other.size(); i++)
        headers.addElement(other.elementAt(i));
    if (subject.length() > 0)
      headers.addElement("Subject: " + subject);
    return headers.elements();
  }

  public Enumeration getBody()
    { return body.elements(); }

  public void clear()
  {
    from = to = cc = bcc = subject = date = "";
    body = null;
    msgID = replyTo = "";
    received = null;
    extensions = null;
    other = null;
    header = null;
  }

  private void parseHeader(String header)
  {
    int headerTypeLength = header.indexOf(":");
    String headerType = header.substring(0,headerTypeLength+1);
    String headerTail = header.substring(headerTypeLength+2);
    if (headerType.equalsIgnoreCase("From:"))
      from = headerTail;
    else if (headerType.equalsIgnoreCase("To:"))
      to = headerTail;
    else if (headerType.equalsIgnoreCase("Cc:"))
      cc = headerTail;
    else if (headerType.equalsIgnoreCase("Bcc:"))
      bcc = headerTail;
    else if (headerType.equalsIgnoreCase("Subject:"))
      subject = headerTail;
    else if (headerType.equalsIgnoreCase("Date:"))
      date = headerTail;
    else if (headerType.equalsIgnoreCase("Reply-to:"))
      replyTo = headerTail;
    else if (headerType.equalsIgnoreCase("Message-ID:"))
      msgID = headerTail;
    else if (headerType.equalsIgnoreCase("Received:"))  {
      if (received == null)
        received = new Vector();
      received.addElement(headerTail);
    }
    else if (headerType.startsWith("X-"))  {
      if (extensions == null)
        extensions = new Vector();
      extensions.addElement(header);
    }
    else  {
      if (other == null)
        other = new Vector();
      other.addElement(header);
    }
  }

  private transient String header;

  /**
   * @param lookAhead next message line
   * @return - returns true as long as the end of
   * all headers has not been reached,
   * i.e. lookAhead.length() == 0.
   */
  public boolean insertHeaderLine(String lookAhead)
  {
    if (lookAhead.length() == 0)  {
      if (header != null)
        parseHeader(header);
      return false;
    }
    if (lookAhead.startsWith(" ")
      || lookAhead.startsWith("\t"))  {
      if (header != null)
        header = header + " " + lookAhead.substring(1);
    }
    else  {
      if (header != null)
        parseHeader(header);
      header = lookAhead;
    }
    return true;
  }

  public void attachBody(Vector body)
    { this.body = body; }

  public String getBodyAsString()
  {
    if (body == null)
      return "";
    Enumeration e = body.elements();
    StringBuffer ret = new StringBuffer("");
    while (e.hasMoreElements())
      ret.append((String) e.nextElement() + "\n");
    return ret.toString();
  }

  public void attachBody(String body)
  {
    try  {
      BufferedReader lines =
        new BufferedReader(new StringReader(body));
      String line = lines.readLine();
      if (line != null)  {
        this.body = new Vector();
        while (line != null)  {
          this.body.addElement(line);
          line = lines.readLine();
        }
      }
      else
        this.body = null;
    } catch (Exception e) {
      new WinFrame("Attach email text",e);
    }
  }

  public void parse(String message)
  {
    try  {
      clear();
      BufferedReader lines =
        new BufferedReader(new StringReader(message));
      String line;
      while ((line = lines.readLine()) != null)
        if (!insertHeaderLine(line))
          break;
      // extract body;
      if ((line = lines.readLine()) != null)  {
        body = new Vector();
        while (line != null) {
          body.addElement(line);
          line = lines.readLine();
        }
      }
      else
        body = null;
    } catch (Exception e) {
      new WinFrame("Crack email into headers, etc.",e);
    }
  }

  public Email(String message)
    { parse(message); }

  public Email()  { clear(); }
}