发布一篇NameSender程序片 - 仓酷云

//:NameSender.java
//Anappletthatsendsanemailaddress
//asadatagram,usingJava1.02.
importjava.awt.*;
importjava.applet.*;
importjava.net.*;
importjava.io.*;
publicclassNameSenderextendsApplet
implementsRunnable{
privateThreadpl=null;
privateButtonsend=newButton(
"Addemailaddresstomailinglist");
privateTextFieldt=newTextField(
"typeyouremailaddresshere",40);
privateStringstr=newString();
privateLabel
l=newLabel(),l2=newLabel();
privateDatagramSockets;
privateInetAddresshostAddress;
privatebyte[]buf=
newbyte[NameCollector.BUFFER_SIZE];
privateDatagramPacketdp=
newDatagramPacket(buf,buf.length);
privateintvcount=0;
publicvoidinit(){
setLayout(newBorderLayout());
Panelp=newPanel();
p.setLayout(newGridLayout(2,1));
p.add(t);
p.add(send);
add("North",p);
Panellabels=newPanel();
labels.setLayout(newGridLayout(2,1));
labels.add(l);
labels.add(l2);
add("Center",labels);
try{
//Auto-assignportnumber:
s=newDatagramSocket();
hostAddress=InetAddress.getByName(
getCodeBase().getHost());
}catch(UnknownHostExceptione){
l.setText("Cannotfindhost");
}catch(SocketExceptione){
l.setText("Cantopensocket");
}
l.setText("Readytosendyouremailaddress");
}
publicbooleanaction(Eventevt,Objectarg){
if(evt.target.equals(send)){
if(pl!=null){
//pl.stop();DeprecatedinJava1.2
Threadremove=pl;
pl=null;
remove.interrupt();
}
l2.setText("");
//Checkforerrorsinemailname:
str=t.getText().toLowerCase().trim();
if(str.indexOf()!=-1){
l.setText("Spacesnotallowedinname");
returntrue;
}
if(str.indexOf(,)!=-1){
l.setText("Commasnotallowedinname");
returntrue;
}
if(str.indexOf(@)==-1){
l.setText("Namemustinclude@");
l2.setText("");
returntrue;
}
if(str.indexOf(@)==0){
l.setText("Namemustpreceed@");
l2.setText("");
returntrue;
}
Stringend=
str.substring(str.indexOf(@));
if(end.indexOf(.)==-1){
l.setText("Portionafter@must"+
"haveanextension,suchas.com");
l2.setText("");
returntrue;
}
//EverythingsOK,sosendthename.Geta
//freshbuffer,soitszeroed.Forsome
//reasonyoumustuseafixedsizerather
//thancalculatingthesizedynamically:
byte[]sbuf=
newbyte[NameCollector.BUFFER_SIZE];
str.getBytes(0,str.length(),sbuf,0);
DatagramPackettoSend=
newDatagramPacket(
sbuf,100,hostAddress,
NameCollector.COLLECTOR_PORT);
try{
s.send(toSend);
}catch(Exceptione){
l.setText("Couldntsenddatagram");
returntrue;
}
l.setText("Sent:"+str);
send.setLabel("Re-send");
pl=newThread(this);
pl.start();
l2.setText(
"Waitingforverification"+++vcount);
}
elsereturnsuper.action(evt,arg);
returntrue;
}
//Thethreadportionoftheappletwatchesfor
//thereplytocomebackfromtheserver:
publicvoidrun(){
try{
s.receive(dp);
}catch(Exceptione){
l2.setText("Couldntreceivedatagram");
return;
}
l2.setText(newString(dp.getData(),
0,0,dp.getLength()));
}
}///:~
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<HTML>
<HEAD>
<METACONTENT="text/html">
<TITLE>
AddYourselftoBruceEckelsJavaMailingList
</TITLE>
</HEAD>
<BODYLINK="#0000ff"VLINK="#800080"BGCOLOR="#ffffff">
<FONTSIZE=6><P>
AddYourselftoBruceEckelsJavaMailingList
</P></FONT>
Theappletonthispagewillautomaticallyaddyouremailaddresstothemailinglist,soyouwillreceiveupdateinformationaboutchangestotheonlineversionof"ThinkinginJava,"notificationwhenthebookisinprint,informationaboutupcomingJavaseminars,andnotificationaboutthe“Hands-onJavaSeminar”MultimediaCD.Typeinyouremailaddressandpressthebuttontoautomaticallyaddyourselftothismailinglist.<HR>
<appletcode=NameSenderwidth=400height=100>
</applet>
<HR>
Ifafterseveraltries,youdonotgetverificationitmeansthattheJavaapplicationontheserverishavingproblems.Inthiscase,youcanaddyourselftothelistbysendingemailto
<AHREF="mailto:Bruce@EckelObjects.com">
Bruce@EckelObjects.com</A>
</BODY>
</HTML>
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