学步园

  嗯，从上周五开始安装JAVA虚拟机，到今天总共6天，终于能够实现我想要的功能，呵呵

头一次接触JAVA，j2me，java语法都不会，还好有点c、c++基础

下面就做一下总结，防止以后忘了。。。。。

一 基本术语与常识

JDK-- java development kit :JAVA虚拟机，也就是说所有的java程序必须在jdk安装的前提下才能运行

J2ME--java 2.0 micro edition :应用于移动手机 pda

J2EE--java 2.0 enterprise edition:应用与服务器

J2SE--java 2.0 standard edition:标准规范

WTK--wireless tools kit

MIDP--mobile information device profile

eclipse--java开发环境

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j2me环境搭建：

参考http://www.j2megame.org/index.php/content/view/1336/140.html

     http://ouycp.blog.163.com/blog/static/2694739720073553822198/

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我实现的功能手机客户端向服务器发送socket指令，然后服务器返回相应的图像

/*****************/

/*author:kevin

   date:2009-5-27

   name:sockeimageclient.java

   copyright：all reserved

*/

import javax.microedition.midlet.MIDlet;<br /> import javax.microedition.midlet.MIDletStateChangeException;<br /> import javax.microedition.lcdui.*;<br /> import javax.microedition.io.*;<br /> import javax.microedition.io.file.FileConnection;<br /> import java.io.*;<br /> public class socketimageclient extends MIDlet implements CommandListener{<br /> private Form mainForm;<br /> private Display display;<br /> private Command connectCommand=new Command("connect",Command.ITEM,1);<br /> private Command exitCommand=new Command("Cancel",Command.CANCEL,1);<br /> private TextField tf=new TextField("请输入命令","",50,TextField.ANY);<br /> private GetterThread gt;<br /> protected void destroyApp(boolean arg0) throws MIDletStateChangeException {<br /> // TODO 自动生成方法存根</p> <p> }</p> <p> protected void pauseApp() {<br /> // TODO 自动生成方法存根</p> <p> }</p> <p> protected void startApp() throws MIDletStateChangeException {<br /> // TODO 自动生成方法存根<br /> display=Display.getDisplay(this);<br /> mainForm=new Form("Image Getter");<br /> mainForm.append("click to get Image");<br /> mainForm.addCommand(connectCommand);<br /> mainForm.addCommand(exitCommand);<br /> mainForm.append(tf);<br /> mainForm.setCommandListener(this);<br /> display.setCurrent(mainForm);<br /> gt=new GetterThread(this);<br /> gt.start();</p> <p> }<br /> public void setImage(Image image){<br /> mainForm.append(image);<br /> display.setCurrent(mainForm);<br /> }</p> <p> public void commandAction(Command cmd, Displayable d) {<br /> // TODO 自动生成方法存根<br /> if(cmd==connectCommand){<br /> synchronized(this){<br /> notify();<br /> }<br /> }<br /> else if(cmd==exitCommand){<br /> exitMIDlet();<br /> }<br /> }<br /> private void exitMIDlet(){<br /> try{<br /> destroyApp(false);<br /> notifyDestroyed();<br /> }catch (MIDletStateChangeException e){<br /> e.printStackTrace();<br /> }<br /> }<br /> class GetterThread extends Thread{<br /> private socketimageclient midlet;<br /> public static final String URL="socket://192.168.1.168:8888";<br /> private SocketConnection sc=null;<br /> private DataInputStream dis=null;<br /> private DataOutputStream dos=null;<br /> public GetterThread(socketimageclient midlet){<br /> this.midlet=midlet;<br /> }<br /> public void run(){<br /> synchronized(midlet){<br /> try{</p> <p> midlet.wait();<br /> try {<br /> sc=(SocketConnection)Connector.open(URL);<br /> dos=sc.openDataOutputStream();<br /> String tfs=tf.getString();<br /> dos.writeUTF(tfs);<br /> } catch (IOException e) {<br /> e.printStackTrace();<br /> }<br /> }catch (InterruptedException e){<br /> e.printStackTrace();<br /> }<br /> }<br /> System.out.println("Connect to server...");<br /> try{<br /> // sc=(SocketConnection)Connector.open(URL);<br /> dis=sc.openDataInputStream();<br /> ByteArrayOutputStream baos = new ByteArrayOutputStream();<br /> int ch = 0;<br /> while ((ch = dis.read()) != -1)<br /> {<br /> baos.write(ch);<br /> }<br /> byte[] imageData = baos.toByteArray();<br /> Image image=Image.createImage(imageData,0,imageData.length);<br /> midlet.setImage(image);<br /> baos.close();<br /> dis.close();<br /> sc.close();<br /> }catch(IOException e){<br /> e.printStackTrace();<br /> }<br /> }<br /> }<br /> }