{"id":460,"date":"2007-12-03T00:00:00","date_gmt":"2007-12-02T16:00:00","guid":{"rendered":"http:\/\/www.strongd.net\/?p=460"},"modified":"2011-07-15T09:52:51","modified_gmt":"2011-07-15T01:52:51","slug":"j2me-datagram-receiver","status":"publish","type":"post","link":"https:\/\/www.strongd.net\/?p=460","title":{"rendered":"J2ME Datagram Receiver"},"content":{"rendered":"

import <\/STRONG><\/FONT>java.io.IOException;<\/FONT>
import <\/B><\/FONT>javax.microedition.io.Connector;<\/FONT>
import <\/B><\/FONT>javax.microedition.io.Datagram;<\/FONT>
import <\/B><\/FONT>javax.microedition.io.DatagramConnection;<\/FONT>
<\/FONT>
public class <\/B><\/FONT>DatagramReceiver <\/FONT>{<\/FONT>
    <\/FONT>public static <\/B><\/FONT>void <\/B><\/FONT>main<\/FONT>(<\/FONT>String<\/FONT>[] <\/FONT>args<\/FONT>) {<\/FONT>
        <\/FONT>if <\/B><\/FONT>(<\/FONT>args.length != <\/FONT>1<\/FONT>) {<\/FONT>
            <\/FONT>System.out.println<\/FONT>(<\/FONT>“Usage: DatagramReceiver port”<\/FONT>)<\/FONT>;<\/FONT>
            <\/FONT>System.exit<\/FONT>(<\/FONT>1<\/FONT>)<\/FONT>;<\/FONT>
        <\/FONT>}<\/FONT>
        <\/FONT>
        <\/FONT>try <\/B><\/FONT>{<\/FONT>
            <\/FONT>DatagramConnection receiver = <\/FONT>
                    <\/FONT>(<\/FONT>DatagramConnection<\/FONT>)<\/FONT>Connector.open<\/FONT>(<\/FONT>“datagram:\/\/:” <\/FONT>+ args<\/FONT>[<\/FONT>0<\/FONT>])<\/FONT>;<\/FONT>
            <\/FONT>byte<\/B><\/FONT>[] <\/FONT>buffer = <\/FONT>new <\/B><\/FONT>byte<\/B><\/FONT>[<\/FONT>256<\/FONT>]<\/FONT>;<\/FONT>
            <\/FONT>Datagram dgram = receiver.newDatagram<\/FONT>(<\/FONT>buffer, buffer.length<\/FONT>)<\/FONT>;<\/FONT>
            <\/FONT>for <\/B><\/FONT>(<\/FONT>$$<\/FONT>) {<\/FONT>
                <\/FONT>dgram.setLength<\/FONT>(<\/FONT>buffer.length<\/FONT>)<\/FONT>;<\/FONT>
                <\/FONT>receiver.receive<\/FONT>(<\/FONT>dgram<\/FONT>)<\/FONT>;<\/FONT>
                <\/FONT>int <\/B><\/FONT>length = dgram.getLength<\/FONT>()<\/FONT>;<\/FONT>
                <\/FONT>System.out.println<\/FONT>(<\/FONT>“Datagram received. Length is ” <\/FONT>+ length<\/FONT>)<\/FONT>;<\/FONT>
<\/FONT>
                <\/FONT>\/\/ Show the content of the datagram.<\/FONT>
                <\/FONT>for <\/B><\/FONT>(<\/FONT>int <\/B><\/FONT>i = <\/FONT>0<\/FONT>; i < length; i++<\/FONT>) {<\/FONT>
                    <\/FONT>System.out.print<\/FONT>(<\/FONT>buffer<\/FONT>[<\/FONT>i<\/FONT>] <\/FONT>+ <\/FONT>” “<\/FONT>)<\/FONT>;<\/FONT>
                <\/FONT>}<\/FONT>
                <\/FONT>System.out.println<\/FONT>()<\/FONT>;<\/FONT>
                <\/FONT>
                <\/FONT>\/\/ Send it back…<\/FONT>
                <\/FONT>receiver.send<\/FONT>(<\/FONT>dgram<\/FONT>)<\/FONT>;<\/FONT>
            <\/FONT>}<\/FONT>
        <\/FONT>} <\/FONT>catch <\/B><\/FONT>(<\/FONT>IOException ex<\/FONT>) {<\/FONT>
            <\/FONT>System.out.println<\/FONT>(<\/FONT>“IOException: ” <\/FONT>+ ex<\/FONT>)<\/FONT>;<\/FONT>
        <\/FONT>}<\/FONT>
    <\/FONT>}<\/FONT>
}<\/FONT><\/FONT>

\n

<\/DIV><\/p>\n","protected":false},"excerpt":{"rendered":"

import java.io.IOException;import javax.microedition.io.Connector;import javax.microedition.io.Datagram;import javax.microedition.io.DatagramConnection;public class DatagramReceiver {    public static void main(String[] args) {        if (args.length != 1) {            System.out.println(“Usage: DatagramReceiver port”);            System.exit(1);        }                try {            DatagramConnection receiver =                     (DatagramConnection)Connector.open(“datagram:\/\/:” + args[0]);            byte[] buffer = new byte[256];            Datagram dgram = receiver.newDatagram(buffer, buffer.length);            for ($$) {                dgram.setLength(buffer.length);                receiver.receive(dgram);                int length = dgram.getLength();                System.out.println(“Datagram received. Length is ” + length);                \/\/ Show the content of the datagram.                for (int i = 0; i < length; i++) {                    System.out.print(buffer[i] + ” “);                }                System.out.println();                                \/\/ Send it back…                receiver.send(dgram);            }        } catch (IOException ex) {            System.out.println(“IOException: ” + ex);        }    }}<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[124],"class_list":["post-460","post","type-post","status-publish","format-standard","hentry","category-linux","tag-j2me"],"_links":{"self":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/460","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=460"}],"version-history":[{"count":1,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/460\/revisions"}],"predecessor-version":[{"id":914,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/460\/revisions\/914"}],"wp:attachment":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=460"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=460"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=460"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}