guestbook.java

模拟留言簿的网络程序,请收下

        
        c.insets=new Insets(3,0,0,5);
        c.fill=GridBagConstraints.NONE;
        c.anchor=GridBagConstraints.WEST;
        c.gridwidth=GridBagConstraints.REMAINDER;
        tf1=new TextField("",32);
       	gridbag.setConstraints(tf1,c);
       	add(tf1);
        
        c.insets=new Insets(3,5,0,0);
        c.gridwidth=1;
        c.fill=GridBagConstraints.NONE;
        c.anchor=GridBagConstraints.EAST;
        label = new Label("邮箱地址（可选项）：");
        gridbag.setConstraints(label,c);
       	add(label);
        
        c.insets=new Insets(3,0,0,5);
        c.gridwidth=GridBagConstraints.REMAINDER;
        c.fill=GridBagConstraints.NONE;
        c.anchor=GridBagConstraints.WEST;
        tf2=new TextField("",32);
       	gridbag.setConstraints(tf2,c);
       	add(tf2);
       	
        c.insets=new Insets(8,5,0,5);
        c.gridwidth=GridBagConstraints.REMAINDER;
        c.fill=GridBagConstraints.NONE;
        c.anchor=GridBagConstraints.CENTER;
        label = new Label("您可以在下面书写任何留言内容");
        gridbag.setConstraints(label,c);
       	add(label);

       	c.insets=new Insets(3,5,3,5);
        c.gridwidth=GridBagConstraints.REMAINDER;;
        c.fill=GridBagConstraints.BOTH;
        ta1=new TextArea("",6,66);
       	gridbag.setConstraints(ta1,c);
       	add(ta1);

        c.insets=new Insets(3,5,3,0);
        c.gridwidth=2;
        c.fill=GridBagConstraints.HORIZONTAL;
        sendButton =new tButton("发送");
       	gridbag.setConstraints(sendButton,c);
       	add(sendButton);

        c.insets=new Insets(3,0,3,0);
        tButton b=new tButton("清除");
       	gridbag.setConstraints(b,c);
       	add(b);

        c.insets=new Insets(3,0,3,5);
       	c.gridwidth=GridBagConstraints.REMAINDER;
        b=new tButton("退出");
       	gridbag.setConstraints(b,c);
       	add(b);

      	c.insets=new Insets(3,5,3,5);
        c.gridwidth=GridBagConstraints.REMAINDER;;
        c.fill=GridBagConstraints.BOTH;
        ta2=new TextArea("准备就绪",3,66);
       	gridbag.setConstraints(ta2,c);
       	add(ta2,false);
       	ta2.setEditable(false);

       	validate();
       	smtp.setScroller(ta2);
       	setBackground(Color.lightGray);
        System.out.println(COPYRIGHT);
    }

    private void clearText()
    {
        tf1.setText("");
        tf2.setText("");
        ta1.setText("");
        ta2.setText("准备就绪");
    }

    public void show()
    {
        pack();
        sendButton.enable();
        clearText();
        Dimension screenSize = getToolkit().getScreenSize();
        move((screenSize.width - size().width)/2,
                       (screenSize.height - size().height)/2);
        super.show();
    }

    public boolean action(Event e, Object arg)
    {
        String NOT_SENT = "消息没有被发送出去.";
        String NO_DATA  = "没有可发送的留言内容.";
		if(arg.equals("退出")){
			hide();
	  		return true;
        }
        else if(arg.equals("清除")){
            clearText();
            return true;
        }
        else if (arg.equals("发送")){
            if(tf1.getText().length() + tf2.getText().length() + ta1.getText().length() == 0){
        	    ta2.appendText("\r\n" + NO_DATA);
        	    System.out.println(NO_DATA);
        	}
        	else{
        	    sendButton.disable();
	        	String message="用户：" + tf1.getText() + "\n" +
        			           "邮件地址: " + tf2.getText() + "\n\n" +
        	    		       ta1.getText() ;
                try{
        	        smtp.mailMessage("Guestbook Entry!",message);
                }catch (Exception exception){
                    String errMsg=exception.toString();
                    ta2.appendText("\r\n" + errMsg.substring(errMsg.indexOf(":")+2, errMsg.length()));
                    System.out.println(errMsg.substring(errMsg.indexOf(":")+2, errMsg.length()));
                    ta2.appendText("\r\n" + NOT_SENT);
                    System.out.println(NOT_SENT);
                    sendButton.enable();
                }
           	}
        }
        return false;
    }
}

public class GuestBook extends Applet
{
    static final String COPYRIGHT  = "(C)2003 by Ali";
    static final String IMAGE_LOAD = "正在载入图片...请稍后.";
    static final String VERSION    = "留言簿v1.0";
    static final String TITLE      = "留言簿";
	int width,height;
	tFrame window=null;
	smtpSend smtp = null;
	String szButton;
	String szReceiver;
	String szTitle;
	String szAppletImage;
	String szLogoImage;
	int imageCount = 0;
	imageLoader il=null;
	Image images[];
	boolean threeD;
	Color bgColor;
	Color fgColor;
	Button button;

	public void init()
	{
	    String szColor;
        szReceiver = getParameter("receiver");
		if(null==(szTitle=getParameter("title")))
			szTitle=TITLE;
		if(null==(szButton=getParameter("button")))
			szButton=TITLE;
		if(null==(szColor=getParameter("bgcolor")))
			bgColor=Color.lightGray;
	    else bgColor = parseColorString(szColor);
		if(null==(szColor=getParameter("fgcolor")))
			fgColor=Color.black;
	    else fgColor = parseColorString(szColor);
	    String param=getParameter("3d_logo");
	    if(null != param && Integer.valueOf(param).intValue() > 0)threeD=true;
	    else threeD=false;
	    add (button=new Button(szButton));
		width=size().width; height=size().height;
        button.move((width-button.size().width)/2,
						(width-button.size().width)/2);
		if(null != (szAppletImage = getParameter("applet_image")))imageCount++;
		if(null != (szLogoImage = getParameter("logo_image")))imageCount++;
		if(imageCount > 0){
		    int index=0;
    		String szImage[] = new String[imageCount];
    		if(null != szAppletImage)szImage[index++]=szAppletImage;
    		if(null != szLogoImage)szImage[index]=szLogoImage;
    		il=new imageLoader(this, szImage, imageCount, null);
    		il.start();
    		images=new Image[imageCount];
    	}
 	}

    private Color parseColorString(String colorString)
    {
        if(colorString.length()==6){
            int R = Integer.valueOf(colorString.substring(0,2),16).intValue();
            int G = Integer.valueOf(colorString.substring(2,4),16).intValue();
            int B = Integer.valueOf(colorString.substring(4,6),16).intValue();
            return new Color(R,G,B);
        }
        else return Color.lightGray;
    }

	public void paint(Graphics g)
	{
		Color color=g.getColor();
		FontMetrics fm=g.getFontMetrics();
	    if(il != null){
	        g.drawString(IMAGE_LOAD,(size().width-fm.stringWidth(IMAGE_LOAD))/2,size().height-fm.getMaxDescent()-3);
	        while(null == (images = il.retrieveImages()));
	        il.stop();
	        il=null;
	    }
	    g.setColor(bgColor);
		g.fill3DRect(0,0,size().width,size().height,true);
		g.setColor(fgColor);
	    if(null != szAppletImage && null != images)
			    g.drawImage(images[0], (size().width-images[0].getWidth(this))/2, button.size().height
				    +(size().height-images[0].getHeight(this)-button.size().height)/3,this);
        g.drawString(COPYRIGHT,(size().width-fm.stringWidth(COPYRIGHT))/2,size().height-fm.getMaxDescent()-3);
        g.setColor(color);
	}

    public boolean action(Event evt, Object arg)
    {
		if(arg.equals(szButton)){
		    if (null == smtp)
		        smtp=new smtpSend(getCodeBase().getHost(),szReceiver);
            if(null == window)
                window=new gbFrame(szTitle, smtp, (null != szLogoImage && null != images)? images[imageCount-1] : null, threeD);
            window.show();
			return true;
        }
		else return false;
    }
	//Applet 参数
    public String[][] getParameterInfo()
    {
		String[][] info = {
            {"width","int","width of the applet, in pixels"},
            {"height","int","height of the applet, in pixels"},
            {"receiver","string","SMTP 'RCPT TO:' parameter <null>"},
            {"applet_image","string","GIF file to display on applet panel <null>"},
            {"logo_image","string","GIF file to display on message dialog <null>"},
            {"3d_logo","int","Non-zero produces an inletted logo image <0>"},
            {"bgcolor","String","RGB hex triplet for applet panel background <lightGray>"},
            {"fgcolor","String","RGB hex triplet for applet panel foreground <black>"},
            {"title","string","title for popup window <Guest Book >"},
            {"button","string","Label to appear in applet's button <Guest Book >"}
        };
        return info;
    }
    //Applet相关信息
    public String getAppletInfo()
    {
        return (	VERSION + " - simulates a guest log\n" +
        			"by E-mailing guest data to page owner, by Ali");
    }
}