1、端口),返回ServerSocketConnection3.如果有客户端连接上来,可以用ServerSocketConnection.accepteAndOpen()返回SocketConnectionSocketConnection重要方法:1.getAddress():2.openDataInputStream/openInputStream:打开输入流3.openDataOutputStream/openOutputStream:打开输出流案例1:客户端与服务器端建立连接 ClientMIDlet1.java文件import javax.microedition.io.Connector
2、;/客户端public class ClientMIDlet1 extends MIDlet protected void destroyApp(boolean arg0) throws MIDletStateChangeException protected void pauseApp() protected void startApp() throws MIDletStateChangeException try Connector.open(/127.0.0.1:9999); catch(Exception ex) ex.printStackTrace(); ServerMIDlet1.
3、java文件import javax.microedition.io.ServerSocketConnection;/服务器端public class ServerMIDlet1 extends MIDlet public ServerMIDlet1() /监听某个端口 ServerSocketConnection ssc = (ServerSocketConnection)Connector.open( /等待客户端连接,如果没有客户端连接,程序在这里阻塞 System.out.println(ssc.getLocalAddress();/获取IP地址 System.out.println(
4、ssc.getLocalPort();/获取端口号 ssc.acceptAndOpen(); catch(Exception ex)ex.printStackTrace();案例2:客户端与服务器端建立连接.客户端向服务器端发送“Hello”,服务器端向客户端发送“Welcome to join us” ClientMIDlet2.java文件import java.io.DataInputStream;import java.io.DataOutputStream;import javax.microedition.io.SocketConnection;import javax.micro
5、edition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException;public class ClientMIDlet2 extends MIDlet /连接到服务器端,连接成功,返回的SocketConnection充当通信桥梁 SocketConnection sc = (SocketConnection)Connector.open( /*以后就可以通过sc与服务端通信*/ DataOutputStream dos = sc.openDataOutputStream(); /输出信息 dos.
6、writeUTF(Hello DataInputStream dis = sc.openDataInputStream(); String msg = dis.readUTF(); System.out.println(msg); ServerMIDlet2.java文件public class ServerMIDlet2 extends MIDlet public ServerMIDlet2() /等待客户端连接,如果有客户端链接,acceptAndOpen方法返回的StreamConnection强制转换为SocketConnection充当通信桥梁 SocketConnection sc
7、 = (SocketConnection)ssc.acceptAndOpen(); /*以后就可以通过sc与客户端通信*/ System.out.println(客户端: + sc.getAddress();Welcome to join us 案例3:简单聊天室程序(未经过优化,会抛出异常) ChatClientMIDlet.java文件 /优化之前文件public class ChatClientMIDlet extends MIDlet implements CommandListener private SocketConnection sc = null; / * private C
8、ommand cmdSend = new Command(发送,Command.SCREEN,1); private Form frmChat = new Form(聊天界面 private TextField tfMsg = new TextField(输入聊天信息,255,TextField.ANY); private Display display; display = Display.getDisplay(this); display.setCurrent(frmChat); frmChat.addCommand(cmdSend); frmChat.append(tfMsg); frm
9、Chat.setCommandListener(this); sc = (SocketConnection)Connector.open( / * new ReceiveThread().start(); public void commandAction(Command c, Displayable d) if(c=cmdSend) try DataOutputStream dos = sc.openDataOutputStream();/ / * dos.writeUTF(tfMsg.getString(); catch(Exception ex) /ex.printStackTrace(
10、); class ReceiveThread extends Thread public void run() while(true) try DataInputStream dis = sc.openDataInputStream(); / * String msg = dis.readUTF(); frmChat.append(msg + n catch(Exception ex) ex.printStackTrace(); ChatServerMIDlet.java文件 /优化之前文件import javax.microedition.lcdui.Command;import javax
11、.microedition.lcdui.CommandListener;import javax.microedition.lcdui.Display;import javax.microedition.lcdui.Displayable;import javax.microedition.lcdui.Form;import javax.microedition.lcdui.TextField;public class ChatServerMIDlet extends MIDlet implements CommandListener private ServerSocketConnectio
12、n ssc = null; / * ssc = (ServerSocketConnection)Connector.open( sc = (SocketConnection)ssc.acceptAndOpen(); / * / * / * 优化方式:删除处代码在处添加代码: private DataInputStream dis = null; private DataOutputStream dos = null;在处添加代码: dis = sc.openDataInputStream(); dos = sc.openDataOutputStream();聊天室程序1.ChatServerM
13、IDletimport java.io.*;import javax.microedition.io.*;import javax.microedition.lcdui.*;import javax.microedition.midlet.*; private boolean run = true; dis = sc.openDataInputStream(); dos = sc.openDataOutputStream(); public void commandAction(Command c,Displayable d) catch(Exception ex) while(run) try catch(Exception ex)ex.printStackTrace(); close(); public void close() dos.close(); dis.close(); sc.close(); ssc.close(); catch(Exception ex)ChatClientMIDlet import example1.ChatServerMIDlet.ReceiveThread; protecte
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