printmessagethread.java

一个用java写的mail.里面的代码值得我们去研究！学习。

      } else {
        line = text.substring( 0, endi );
        text = text.substring( endi + skip );
      }

      if ( line.length() == 0 ) {
        newLine();
        continue;
      }

      int off = line.length() - 1;

      for ( ; line.length() > 0 ; ) {
        int sW = this.plainFM.stringWidth( line );
        if ( sW < lineW ) {

        if ( Package.DEBUG && Debug_ > 0 ) {
          System.out.println( "BODY DRAW1: Sw=" + sW +
                              " line[" + (line==null?"(null)":""+line.length()) +"] '" +
                              (line==null?"(null)":line)+"'" );
        }

          this.pg.drawString( line, this.xPosition, this.yPosition );

        if ( Package.DEBUG && Debug_ > 0 ) {
          System.out.println( "BODY DRAW1: DONE." );
        }

          newLine();
          break;
        }

        for ( ; ; ) {
          int si = line.lastIndexOf( " ", off );
          int ti = line.lastIndexOf( "\t", off );

          int idx = ( si > ti ? si : ti );
          if ( idx == -1 )
            idx = line.length() - 1;

          off = idx - 1;
          String sub = line.substring( 0, idx );
          sW = this.plainFM.stringWidth( sub );
          if ( sW < lineW ) {

            if ( Package.DEBUG && Debug_ > 0 ) {
              System.out.println( "BODY DRAW2: line[" +(sub==null?"(null)":""+sub.length()) +"] '" +
                                  (sub==null?"(null)":sub)+"'" );
            }

            this.pg.drawString( sub, this.xPosition, this.yPosition );

            newLine();

            line = line.substring( idx + 1 );
            off = line.length() - 1;
            break;
          }
        }
      }
    }
  }

  private void
  newLine() {
    if ( Package.DEBUG && Package.isTraceable( "PrintMessageThread" ) ) {
      System.out.println( "PrintMessageThread.newLine()" );
    }

    this.yPosition += this.lineHeight;
    this.xPosition = this.xMargin;

    if ( this.yPosition > this.pageSz.height ) {
      this.yPosition = this.yMargin + this.lineHeight;
      Font saveF = this.pg.getFont();
      this.pg.dispose();
      this.pg = job.getGraphics();
      this.pg.setFont( saveF );
    }
  }

  private String
  printTextArea( String text, int xOrigin, int yOrigin, int width, int height, int lineH ) {
    if ( Package.DEBUG && Package.isTraceable( "PrintMessageThread" ) ) {
      System.out.println( "PrintMessageThread.printTextArea(s,i,i,i,i,i): " +
                          "X-" + xOrigin + ",Y-" + yOrigin +
                          ",W-" + width + ", H-" + height + ",LH-" + lineH );
    }

    String line;
    this.yPosition = yOrigin;
    this.xPosition = xOrigin;

    for ( ; text.length() > 0 ; ) {
      int endi;
      int skip = 1;
      int ni = text.indexOf( "\n" );
      int ri = text.indexOf( "\r" );
      if ( ri != -1 && ni == (ri + 1) ) {
      // CR/NL
        endi = ri;
        skip = 2;
      } else if ( ri == -1 && ni == -1 ) {
        endi = -1;
      } else if ( ri == -1 ) {
        endi = ni;
      } else if ( ni == -1 ) {
        endi = ri;
      } else {
        endi = ( ri < ni ? ri : ni );
      }

      if ( endi == -1 ) {
        line = text;
        text = "";
      } else {
        line = text.substring( 0, endi );
        text = text.substring( endi + skip );
      }

      if ( line.length() == 0 ) {
        if ( ((this.yPosition + lineH) - yOrigin) > height )
          return text;

        if ( Package.DEBUG && Debug_ > 0 ) {
          System.out.println( "BLANK LINE!!" );
        }

        this.yPosition += lineH;
        this.xPosition = xOrigin;

        continue;
      }

      int off = line.length() - 1;

      for ( ; line.length() > 0 ; ) {
        int sW = this.plainFM.stringWidth( line );
        if ( ((this.xPosition - xOrigin) + sW) < width ) {

          if ( Package.DEBUG && Debug_ > 0 ) {
            System.out.println( "DRAWSTRING1( '" +line+ "'\n" +
                                "X=" +this.xPosition+ ", Y=" +this.yPosition+ " sW=" +sW );
          }

          this.pg.drawString( line, this.xPosition, this.yPosition );

          if ( ((this.yPosition + lineH) - yOrigin) > height )
            return text;

          if ( text.length() > 0 ) {
            this.yPosition += lineH;
            this.xPosition = xOrigin;
          }

          break;
        }

        for ( ; ; ) {
          int si = line.lastIndexOf( " ", off );
          int ti = line.lastIndexOf( "\t", off );

          int idx = ( si > ti ? si : ti );
          if ( idx == -1 )
            idx = line.length() - 1;

          off = idx - 1;

          String sub = line.substring( 0, idx );
          sW = this.plainFM.stringWidth( sub );

          if ( Package.DEBUG && Debug_ > 0 ) {
            System.out.println( "OFF_2 '" +off+ " SW=" + sW );
          }

          if ( (this.xPosition + sW) < (xOrigin + width) ) {

            if ( Package.DEBUG && Debug_ > 0 ) {
              System.out.println( "DRAWSTRING2( '" +sub+ "'\n" +
                                  "X=" +this.xPosition+ ", Y=" +this.yPosition+ " sW=" +sW );
            }

            this.pg.drawString( sub, this.xPosition, this.yPosition );

            line = line.substring( idx + 1 );

            if ( ((this.yPosition + lineH) - yOrigin) > height )
              return ( line + "\n" + text );

            this.yPosition += lineH;
            this.xPosition = xOrigin;

            off = line.length() - 1;
            break;
          }
        }
      }
    }

    return null;
  }

  private void
  printHeaderLine( String title, Address[] adds ) {
    if ( Package.DEBUG && Package.isTraceable( "PrintMessageThread" ) ) {
      System.out.println( "PrintMessageThread.printHeaderLine(s,a[])" );
    }

    int subMargin = this.xMargin;

    this.lineHeight = this.plainFM.getHeight();

    this.pg.setFont( this.titleF );

    pg.drawString( title, this.xPosition, this.yPosition );
    this.xPosition += titleFM.stringWidth( title ) + 6;

    subMargin = this.xPosition;

    for ( int i = 0 ; adds != null && i < adds.length ; ++i ) {
      StringBuffer sbuf = new StringBuffer();

      sbuf.append( adds[i].toString() );
      if ( i < (adds.length - 1) )
        sbuf.append( ", " );

      String s = sbuf.toString();

      int sWidth = this.plainFM.stringWidth( s );

      if ( (this.xPosition + sWidth) > (this.pageSz.width - this.xMargin) ) {
        this.xPosition = subMargin;
        this.yPosition += this.lineHeight;
        if ( this.yPosition > (this.pageSz.height - this.yMargin) ) {
          this.yPosition = this.yMargin;
          this.pg.dispose();
          this.pg = job.getGraphics();
        }
      }

      this.pg.setFont( this.plainF );
      this.pg.drawString( s, this.xPosition, this.yPosition );

      this.xPosition += sWidth;
    }
  }

  private void
  printHeaderLine( String title, String line ) {
    if ( Package.DEBUG && Package.isTraceable( "PrintMessageThread" ) ) {
      System.out.println( "PrintMessageThread.printHeaderLine(s,s)" );
    }

    StringBuffer sbuf = new StringBuffer();

    this.pg.setFont( this.titleF );
    pg.drawString( title, this.xPosition, this.yPosition );
    this.xPosition += this.titleFM.stringWidth( title ) + 6;
    
    this.pg.setFont( this.plainF );

    if ( Package.DEBUG && Debug_ > 0 ) {
      System.out.println( "PAGE SZ: W " + this.pageSz.width +
                          " H " + this.pageSz.height +
                          " XM " + this.xMargin +
                          " YM " + this.yMargin );
    }

    printTextArea( line, this.xPosition, this.yPosition,
                   ( ( this.pageSz.width  - this.xMargin ) - this.xPosition ),
                   ( ( this.pageSz.height - this.yMargin ) - this.yPosition ),
                   this.plainFM.getHeight() );

//    pg.drawString( line, this.xPosition, this.yPosition );
//    this.xPosition += this.plainFM.stringWidth( line );
  }

  private StringBuffer
  getMessageText( StringBuffer buf, Part part ) {
    if ( Package.DEBUG && Package.isTraceable( "PrintMessageThread" ) ) {
      System.out.println( "PrintMessageThread.getMessageText(sb,p)" );
    }

    try {           
      Object content = MessageUtilities.getPartContent( part );

      if ( content == null ) {
      } else if ( content instanceof Multipart ) {
        Multipart mPart = (Multipart) content;
        int partCount = mPart.getCount();
        for ( int i = 0 ; i < partCount ; i++ ) {
          getMessageText( buf, mPart.getBodyPart(i) );
          buf.append( "\n" );
        }
      } else if ( content instanceof Image ) {
        buf.append( "<<<Image: " );
        buf.append( MessageUtilities.getFileName( part ) );
        buf.append( ">>>" );
        buf.append( "\n" );
      } else if ( content instanceof String ) {
        buf.append( (String)content );
      } else {
        buf.append( "<<<Attachment: " );
        buf.append( MessageUtilities.getFileName( part ) );
        buf.append( ">>>" );
        buf.append( "\n" );
      }
    } catch ( Exception ex ) {
      ex.printStackTrace();
    }

    return buf;
  }

}