📄 在j2me中实现基于udp协议通讯程序.htm
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<DIV class=newsmallbox>在J2ME中实现基于UDP协议通讯程序 </DIV>
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<DIV class=newsmall1box>
<DIV class=newtitle1>作者： mingjava </DIV>
<DIV class=newtitle2>出处： J2ME开发网 </DIV>
<DIV class=newtitle3>责任编辑： 方舟 </DIV>
<DIV class=newtitle4>[ 2004-11-26 17:46 ]</DIV></DIV>
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<DIV class=guanggao><SPAN
id=contentAdv></SPAN></DIV> 在GCF中提供了DatagramConnection和Datagram两个接口，借助他们我们可以在J2ME中基于<A
class=bluekey href="http://www.yesky.com/key/1843/591843.html"
target=_blank>UDP</A>协议开发联网应用程序。在MIDP2.0中，添加了UDPDatagramConnection这个接口，他扩展了DatagramConnection并添加了两个方法getLocalAddress()和getLocalPort()。我们知道UDP服务是不可靠的，如果你希望开发更可靠的联网应用的话可以采用SocketConnection，因为TCP服务是面向连接且可靠的。我们还必须清楚地一点是以上所说的各种连接方式都不是MIDP规范中规定必须实现的。因此在使用之前请参考特定设备的开发文档。MIDP中只有Http连接是必须支持的。
<BR><BR> 同样，我们要获得DatagramConnection的话，必须通过Connector的open方法，其中的<A class=bluekey
href="http://www.yesky.com/key/3809/593809.html" target=_blank>URL</A>应该满足如下的形式。
<OL>
<LI>datagram://localhost:5555 这样的话表示建立了一个客户端模式的连接。在指定ip:localhost和指定端口:5555
<LI>datagram://:5555 这样建立的是一个服务器端模式的连接，在本地的5555端口。</LI></OL>
<P> <A class=bluekey href="http://www.yesky.com/key/4060/399060.html"
target=_blank>建立连接</A>后，我们可以通过DatagramConnection的newDatagram()方法构造一个Datagram，然后调用DatagramConnection的send()方法。这样数据报将会发送到指定的接受方。例如你可以构建这个一个负责发送数据的Sender类。</P>
<TABLE borderColor=#ffcc66 width="90%" align=center bgColor=#e6e4dd border=1>
<TBODY>
<TR>
<TD>
<P>package com.<A class=bluekey
href="http://www.yesky.com/key/3767/593767.html"
target=_blank>siemens</A>.datagramtest;</P>
<P>import javax.microedition.io.Datagram;<BR>import
javax.microedition.io.DatagramConnection;</P>
<P>public class Sender extends Thread<BR>{</P>
<P> private DatagramConnection dc;</P>
<P> private String <A class=bluekey
href="http://www.yesky.com/key/318/595318.html"
target=_blank>address</A>;</P>
<P> private String message;</P>
<P> public Sender(DatagramConnection dc)<BR> {<BR> this.dc =
dc;<BR> start();<BR> }</P>
<P> public synchronized void send(String addr, String msg)<BR> {<BR>
address = addr;<BR> message = msg;<BR> notify();<BR> }</P>
<P> public synchronized void run()<BR> {</P>
<P> while (true)<BR> {</P>
<P> // If no client to deal, wait until one connects<BR> if
(message == null)<BR> {<BR> try<BR> {<BR>
wait();<BR> } catch (InterruptedException e)<BR>
{<BR> }<BR> }</P>
<P> try<BR> {<BR> byte[] bytes =
message.getBytes();<BR> Datagram dg = null;<BR> // Are we a
sender thread for the client ? If so then there's<BR> // no address
parameter<BR> if (address == null)<BR> {<BR> dg =
dc.newDatagram(bytes, bytes.length);<BR> } else<BR>
{<BR> dg = dc.newDatagram(bytes, bytes.length,
address);<BR> System.out.println(address);<BR>
}<BR> dc.send(dg);<BR> } catch (Exception ioe)<BR>
{<BR> ioe.printStackTrace();<BR> }</P>
<P> // Completed client handling, return handler to pool and<BR>
// mark for wait<BR> message = null;<BR> }<BR> }</P>
<P>}</P></TD></TR></TBODY></TABLE>
<P> 注意联网的时候我们应该在另外一个线程中而不是在主线程中。 <BR><BR></P>
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str += "条 >><a href=\"http://comments.yesky.com/a/6," + channelid + "/" + aid + ".shtml\"><span style=\"text-decoration:underline;\">查看本文所有评论</span></a><<";
if(typeof(tagname) == "string" && tagname.length > 0) {
str += " >><a href=\"http://comments.yesky.com/t/" + UrlEncode(tagname) + "/6," + channelid + "/" + aid + ".shtml\" target=\"_blank\" class=\"red-s\"><b>查看主题：</b><font color=\"#FF0000\">" + tagname + "</font>所有主题</a> << ";
} else {
str += " >> >> >> <a href=\"http://comments.yesky.com/a/6," + channelid + "/" + aid + ".shtml\" target=\"_blank\" class=\"red-s\">查看该文章所有相关主题</a> << << << ";
}
str += "</div>";
var hasVisits = typeof(latest_comments_visits) == "object" && latest_comments_visits.length > 0;
var hasTag = typeof(latest_comments_tagid) == "number" && latest_comments_tagid > 0;
if(hasVisits) {
str += "<table width=\"99%\" border=\"1\" cellspacing=\"0\" cellpadding=\"2\" align=\"center\" style=\"line-height: 120%\" bordercolor=\"#FFFFFF\" bordercolorlight=\"#D0CCD0\">" +"\n"+
" <tr bgcolor=\"#FFFFFF\">" +"\n"+
" <td width=\"64%\">标题</td>" +"\n"+
" <td width=\"15%\">发表时间</td>" +"\n"+
" <td width=\"21%\">发表人</td>" +"\n"+
"</tr>" ;
for (i = 0; i < latest_comments_poster.length && i < 10; i++) {
str += "<tr bgcolor=\"#F6F6F6\">" +"\n" ;//+
//" <td>" + latest_comments_visits[i] + "</td>" +"\n"+
//" <td>" + latest_comments_replies[i] + "</td>";
var url;
if (hasTag) {
url = "http://comments.yesky.com/l/" + latest_comments_id[i] + "/" + latest_comments_tagid + "/" + latest_comments_type[i] + "," + channelid + "/" + latest_comments_rfid[i] + ".shtml"
} else {
url = "http://comments.yesky.com/l/" + latest_comments_id[i] + "/" + 0 + "/" + latest_comments_type[i] + "," + channelid + "/" + latest_comments_rfid[i] + ".shtml"
}
str += " <td><a href=\"" + url + "\" target=\"_blank\">" + latest_comments_contents[i].replace(re,"<img src=/TLimages/smile/face$2.gif border=0 align=middle> ") + "</a></td>" +"\n"+
" <td><font color=\"#CC6600\">" + latest_comments_postdate[i] + "</font></td>" +"\n"+
" <td nowrap=\"\" ><font color=\"#FF3300\">" + latest_comments_poster[i] + "</font></td>" +"\n"+
"</tr> ";
}
str += "</table>";
} else {
var hasLevel = typeof(latest_comments_level) == "object";
str += "<div class=\"wzplcontent\">";
str += "<ul class=\"spaceListul\">";
for (i = 0; i < latest_comments_poster.length && i < 10; i++) {
if(hasLevel) {
str += "[" + latest_comments_level[i] + "楼：<span class=\"fontcolor\">";
} else {
str += "[ <span class=\"fontcolor\">";
}
str += latest_comments_poster[i];
str += "</span>] ";
str += latest_comments_contents[i].replace(re,"<img src=/TLimages/smile/face$2.gif border=0 align=middle> ");
str += " (";
str += latest_comments_postdate[i];
str += " )<br/>";
}
str += "</ul></div>";
}
commentsSpanText.innerHTML = str;
} else {
var str = "<div>";
str += "目前本文还没有相关主题。立即发表主题，马上成为本文的第一个发表者！";
str += "</div>";
commentsSpanText.innerHTML = str;
}
}
</SCRIPT>
<SCRIPT language=JavaScript>
<!--
if(typeof(aid) != "undefined") {
document.write("<script language=\"JavaScript\" charset=\"gb2312\" src=\"http://comments.yesky.com/articlereview/6/"+(aid%5000)+"/"+aid+".js\"><\/script>");
// if(typeof(tagname) == "string" && tagname.length > 0) {
// document.write("<script language=\"JavaScript\" charset=\"gb2312\" src=\"http://comments.yesky.com/tagview/"+(getTagId(tagname)%5000)+"/"+getTagId(tagname)+".js\"><\/script>");
// } else {
// document.write("<script language=\"JavaScript\" charset=\"gb2312\" src=\"http://comments.yesky.com/articlereview/6/"+(aid%5000)+"/"+aid+".js\"><\/script>");
// }
}
//-->
</SCRIPT>
</DIV>
<DIV class=pinlunguan3>
<DIV class=pinlunguan1>
<SCRIPT src="在J2ME中实现基于UDP协议通讯程序.files/uc.js" type=""></SCRIPT>
发表主题：(Html：禁止，UBB：允许)
<FORM name=frmReviewPost action=http://comments.yesky.com/review.post.do
method=post target=_blank><INPUT type=hidden name=tagName> <INPUT type=hidden
name=rfid> <INPUT type=hidden value=6 name=type> <INPUT type=hidden name=cid>
笔名：<INPUT size=17 name=userName><INPUT onclick=JavaScript:submitReviewForm(this.form) type=button value=发表主题 name=but><BR>标题：<INPUT
size=30 name=title><BR><IMG onclick=Cbold() height=22 alt=粗体
src="在J2ME中实现基于UDP协议通讯程序.files/bold.gif" width=23 border=0> <IMG
onclick=Cimage() height=22 alt=图片 src="在J2ME中实现基于UDP协议通讯程序.files/image.gif"
width=23 border=0> <IMG onclick=Cswf() height=22 alt=Flash图片
src="在J2ME中实现基于UDP协议通讯程序.files/swf.gif" width=23 border=0> <IMG onclick=Cwmv()
height=22 alt="Media Player视频文件" src="在J2ME中实现基于UDP协议通讯程序.files/mp.gif" width=23
border=0> <IMG onclick=Crm() height=22 alt=realplay视频文件
src="在J2ME中实现基于UDP协议通讯程序.files/rm.gif" width=23 border=0> <IMG onclick=Curl()
height=22 alt=超级连接 src="在J2ME中实现基于UDP协议通讯程序.files/url1.gif" width=23 border=0>
<IMG onclick=Cemail() height=22 alt=Email连接
src="在J2ME中实现基于UDP协议通讯程序.files/email1.gif" width=23 border=0> <IMG
onclick=Cdir() height=22 alt=Shockwave文件
src="在J2ME中实现基于UDP协议通讯程序.files/Shockwave.gif" width=23 border=0> <TEXTAREA name=contents rows=4 cols=30></TEXTAREA> <BR><A
href="javascript:addSmile('01')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face01.gif" border=0></A> <A
href="javascript:addSmile('02')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face02.gif" border=0></A> <A
href="javascript:addSmile('03')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face03.gif" border=0></A> <A
href="javascript:addSmile('04')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face04.gif" border=0></A> <A
href="javascript:addSmile('05')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face05.gif" border=0></A> <A
href="javascript:addSmile('06')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face06.gif" border=0></A> <A
href="javascript:addSmile('07')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face07.gif" border=0></A> <A
href="javascript:addSmile('08')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face08.gif" border=0></A> <A
href="javascript:addSmile('09')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face09.gif" border=0></A> <A
href="javascript:addSmile('10')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face10.gif" border=0></A> <BR><A
href="javascript:addSmile('11')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face11.gif" border=0></A> <A
href="javascript:addSmile('12')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face12.gif" border=0></A> <A
href="javascript:addSmile('13')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face13.gif" border=0></A> <A
href="javascript:addSmile('14')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face14.gif" border=0></A> <A
href="javascript:addSmile('15')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face15.gif" border=0></A> <A
href="javascript:addSmile('16')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face16.gif" border=0></A> <A
href="javascript:addSmile('17')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face17.gif" border=0></A> <A
href="javascript:addSmile('18')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face18.gif" border=0></A> <A
href="javascript:addSmile('19')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face19.gif" border=0></A> <A
href="javascript:addSmile('20')" target=_self><IMG
src="在J2ME中实现基于UDP协议通讯程序.files/face20.gif" border=0></A>
</FORM><BR>请您注意：遵守国家有关法律、法规，尊重网上道德，承担一切因您的行为而直接或间接引起的法律责任。<BR>天极网拥有管理笔名和留言的一切权利。
<SCRIPT language=JavaScript>
<!--
function addSmile(val) {
with (document.frmReviewPost) {
contents.value += "[s" + val + "]";
}
}
with(document.frmReviewPost) {
if(typeof(comments_nickname) == "string" && comments_nickname.length > 0) {
userName.value = comments_nickname;
} else {
userName.value = "天极网友";
}
if(typeof(aid) != "undefined") rfid.value = aid;
if(typeof(channelid) != "undefined") cid.value = channelid;
if(typeof(tagname) == "string" && tagname.length > 0) {
tagName.value = tagname;
}
}
function submitReviewForm(f) {
with(f) {
if(rfid.value.length > 0) {
if(userName.value.length == 0) {
alert("请输入您的笔名！");
userName.focus();
return;
}
if(userName.value.length > 20) {
alert("笔名太长，字数不成超过20！");
userName.focus();
return;
}
if (title.value.length == 0) {
alert("请输入主题标题");
title.focus();
return false;
}
if (title.value.length > 100) {
alert("标题太长，字数不成超过100");
title.focus();
return false;
}
if(contents.value.length == 0) {
alert("请输入主题内容");
contents.focus();
return;
}
if(contents.value.length > 2000) {
alert("内容太长，字数不成超过2000");
contents.focus();
return;
}
submit();
contents.value = "";
}
}
}
//-->
</SCRIPT>
</DIV>
<DIV class=right>
<DIV class=pinlunguan2><FONT color=#ff0000><B>各地网友会：</B></FONT><SELECT
onchange=JavaScript:window.location=this.value> <OPTION value=""
selected>==请选择==</OPTION> <OPTION
value=http://comments.yesky.com/t/重庆/6,1633/0.shtml>重庆</OPTION> <OPTION
value=http://comments.yesky.com/t/北京/6,1633/0.shtml>北京</OPTION> <OPTION
value=http://comments.yesky.com/t/上海/6,1633/0.shtml>上海</OPTION> <OPTION
value=http://comments.yesky.com/t/天津/6,1633/0.shtml>天津</OPTION> <OPTION
value=http://comments.yesky.com/t/江西/6,1633/0.shtm>江西</OPTION> <OPTION
value=http://comments.yesky.com/t/湖北/6,1633/0.shtml>湖北</OPTION> <OPTION
value=http://comments.yesky.com/t/湖南/6,1633/0.shtml>湖南</OPTION> <OPTION
value=http://comments.yesky.com/t/广东/6,1633/0.shtml>广东</OPTION> <OPTION
value=http://comments.yesky.com/t/山西/6,1633/0.shtml>山西</OPTION> <OPTION
value=http://comments.yesky.com/t/陕西/6,1633/0.shtml>陕西</OPTION> <OPTION
value=http://comments.yesky.com/t/福建/6,1633/0.shtml>福建</OPTION> <OPTION
value=http://comments.yesky.com/t/河南/6,1633/0.shtml>河南</OPTION> <OPTION
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