j2me datagram入門（二）

用戶端和伺服器端分別增設了聊天視窗和聊天記錄 伺服器端和用戶端分別只有一個

伺服器端代碼：

//ServerM.java<br />package udp;<br />import java.io.IOException;<br />import javax.microedition.io.Connector;<br />import javax.microedition.io.Datagram;<br />import javax.microedition.io.UDPDatagramConnection;<br />import javax.microedition.lcdui.Command;<br />import javax.microedition.lcdui.CommandListener;<br />import javax.microedition.lcdui.Display;<br />import javax.microedition.lcdui.Displayable;<br />import javax.microedition.lcdui.Form;<br />import javax.microedition.lcdui.TextField;<br />import javax.microedition.midlet.MIDlet;<br />import javax.microedition.midlet.MIDletStateChangeException;<br />/**<br /> * @author boolean boolean@163.com:<br /> * @version 建立時間：2009-2-26 下午05:06:22<br /> * @todo<br /> */<br />public class ServerM extends MIDlet {<br />private Display display;<br />public ServerM() {<br />display = Display.getDisplay(this);<br />display.setCurrent(new ServerForm("伺服器端"));<br />}<br />protected void startApp() throws MIDletStateChangeException {<br />}<br />protected void destroyApp(boolean arg0) throws MIDletStateChangeException {<br />}<br />protected void pauseApp() {<br />}<br />}<br />class ServerForm extends Form implements CommandListener, Runnable {<br />/** 發言的內容 */<br />private TextField textField = null;<br />/** 指定要發送的地址 */<br />private String address = null;<br />/** 構造報文的大小 */<br />private final int MAX = 255;<br />/** 串連*/<br />private UDPDatagramConnection udcServer = null;<br />public ServerForm(String title) {<br />super(title);<br />textField = new TextField("輸入聊天資訊", null, 30, TextField.ANY);<br />this.append(textField);<br />this.addCommand(new Command("Send", Command.OK, 1));<br />this.setCommandListener(this);<br />try {// 建立串連 指定連接埠9999<br />udcServer = (UDPDatagramConnection) Connector<br />.open("datagram://:9999");<br />} catch (IOException e) {<br />e.printStackTrace();<br />}<br />// 啟動線程<br />new Thread(this).start();<br />}<br />public void commandAction(Command c, Displayable d) {<br />try {<br />// 擷取要發送的字元資料<br />String s = textField.getString();<br />// 構建報文<br />Datagram dgSend = udcServer.newDatagram(s.getBytes(),<br />s.getBytes().length, address);<br />// 發送報文<br />udcServer.send(dgSend);<br />} catch (IOException e) {<br />e.printStackTrace();<br />}<br />}<br />public void run() {<br />while (true) {<br />try {<br />// 防止資料溢出 構造一個比較大的報文<br />Datagram dgRecive = udcServer.newDatagram(MAX);<br />// 接受報文<br />udcServer.receive(dgRecive);<br />// 擷取報文地址<br />address = dgRecive.getAddress();<br />// 報文中的全部資料 byte數組形式<br />byte[] data = dgRecive.getData();<br />// byte數組轉為字元 同時去掉無用資料<br />String recive = new String(data, 0, dgRecive.getLength());<br />// 添加聊天記錄到介面<br />this.append(recive + "/n");<br />} catch (IOException e) {<br />e.printStackTrace();<br />}<br />}<br />}<br />}<br />

 

用戶端代碼：

//ClientM.java<br />package udp;<br />import java.io.IOException;<br />import javax.microedition.io.Connector;<br />import javax.microedition.io.Datagram;<br />import javax.microedition.io.UDPDatagramConnection;<br />import javax.microedition.lcdui.Command;<br />import javax.microedition.lcdui.CommandListener;<br />import javax.microedition.lcdui.Display;<br />import javax.microedition.lcdui.Displayable;<br />import javax.microedition.lcdui.Form;<br />import javax.microedition.lcdui.TextField;<br />import javax.microedition.midlet.MIDlet;<br />import javax.microedition.midlet.MIDletStateChangeException;<br />/**<br /> * @author boolean boolean@163.com:<br /> * @version 建立時間：2009-2-26 下午05:10:50<br /> * @todo<br /> */<br />public class ClientM extends MIDlet {<br />private Display display;<br />public ClientM() {<br />display = Display.getDisplay(this);<br />}<br />protected void startApp() throws MIDletStateChangeException {<br />display.setCurrent(new ClientForm("用戶端"));<br />}<br />protected void destroyApp(boolean arg0) throws MIDletStateChangeException {<br />}<br />protected void pauseApp() {<br />}<br />}<br />class ClientForm extends Form implements CommandListener, Runnable {<br />/** 發言 */<br />private TextField tf;<br />/** 構造報文的大小 */<br />private final int MAX = 255;<br />/** 串連 */<br />private UDPDatagramConnection udcClient = null;<br />public ClientForm(String title) {<br />super(title);<br />tf = new TextField("輸入聊天資訊:", null, 55, TextField.ANY);<br />this.append(tf);<br />this.addCommand(new Command("Send", Command.OK, 1));<br />this.setCommandListener(this);<br />try {<br />udcClient = (UDPDatagramConnection) Connector<br />.open("datagram://127.0.0.1:9999");<br />} catch (IOException e) {<br />e.printStackTrace();<br />}<br />// 啟動接收報文線程<br />new Thread(this).start();<br />}<br />public void commandAction(Command c, Displayable d) {<br />try {<br />// 擷取要發送的字元資料<br />String s = tf.getString();<br />// 構建報文<br />Datagram dgSend = udcClient.newDatagram(s.getBytes(),<br />s.getBytes().length);<br />// 發送報文<br />udcClient.send(dgSend);<br />} catch (IOException e) {<br />e.printStackTrace();<br />}<br />}<br />public void run() {<br />while (true) {<br />try {<br />// 防止資料溢出 構造一個比較大的報文<br />Datagram dgRecive = udcClient.newDatagram(MAX);<br />// 接受報文<br />udcClient.receive(dgRecive);<br />// 報文中的全部資料 byte數組形式<br />byte[] data = dgRecive.getData();<br />// byte數組轉為字元 同時去掉無用資料<br />String recive = new String(data, 0, dgRecive.getLength());<br />// 添加聊天記錄到介面<br />this.append(recive );<br />} catch (IOException e) {<br />e.printStackTrace();<br />}<br />}<br />}<br />}<br />

 

接下來要加入多個用戶端