Java 2 Micro Edition JavaCommnity.Org. (

Transcription

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2 #20 0FADCCDC/DO BD ã M HGL Write Once, Run Anywhere!, But, One Size Doesn t Fit All

3 .HGE HG ( horizontal family of devices) ó?, é Configuration specifies VM features Core APIs (java.lang.*, java.io.*, java.util.*, javax.microedition.io.*, ) JCP(Java Community Process) Compatibility Test 5KHE D (vertical market) API Configuration JCP(Java Community Process) Compatibility Test

4 .HGE HGL5KHE DL Configurations CLDC(Connected, Limited Device Configuration) CDC(Connected Device Configuration) Profiles MIDP (Mobile Information Device Profile) Foundation Profile PDA Profile Personal Profile RMI Profile Configuration Profile? ñ, Write Once Run Anywhere. /..HGGDBMDC F MDC/DO BD.HGE NK@M HG á ñ ó Configuration ú ó Pager (1-way, 2-way) light-weight PDA Cell Phone

5 . /..HGGDBMDC F MDC/DO BD.HGE NK@M HG ó : kb of free memory Processor speed : MHz ÿ, á ó Bandwidth ( < 9600bps) ó (,,, ) Home appliances ó Audio/Video ß, POS(Point- of- sale) < 8BHIDHE. /. CLDC JVM, á CLDC,,, CLDC ÿ Profile :9

6 . /.8DBNK M 1. VM VM þ, Native code interface (preverify) + (runtime verify) 2. (Sandbox) ÿ API ñ (= ) No JNI No way to override ClassPath or System Classes ::. /.8DBNK M ñ (Two- pass verifier) L / Z /= Mc cz MyApp.java L_/ Z /=/O _ Z^ / cz Z X Z`_ Z_ / X \^Xa Download GX X cz Z c MyApp.class Mc cz Z c F_ cac c CLDC Platform MyApp.class :;

7 . /. J2SE java.lang java.util java.io java.lang.object java.lang.class java.lang.runtime java.lang.system java.lang.thread java.lang.runnable java.lang.string java.lang.stringbuffer java.lang.throwable java.lang.boolean java.lang.byte java.lang.short java.lang.integer java.lang.long java.lang.character java.lang.math java.util.vector java.util.stack java.util.hashtable java.util.enumeration java.util.calendar java.util.date java.util.timezone java.util.random java.io.inputstream java.io.outputstream java.io.bytearrayinputstream java.io.bytearrayoutputstream java.io.datainput java.io.dataoutput java.io.datainputstream java.io.dataoutputstream java.io.reader java.io.writer java.io.inputstreamreader java.io.outputstreamwriter java.io.printstream :. /. CLDC javax.microedition.io.* CLDC Networking :GCF GCF : Generic Connection Framework ñ á ó ÿ : ó ú : Connector. open("< protocol>:< address>;< parameters>"); Examples : HTTP: Connector.open(" Sockets: Connector.open("socket:// :9000"); Serial ports: Connector.open("comm:0;baudrate=9600"); Files:Connector.open( " file:///hamburger. dat " ); :

8 ;2 /. ÿ JVM ú No Java native interface (JNI) No reflection No thread groups No weak references No finalization Limited error handling support New implementation of bytecode verification :./..HGGDBMDC/DO BD.HGE HG CLDC ñ ù (32-bit, ) ó ó ROM : 512KB RAM : 256KB á : PDA,, JCP Proposed Final Draft ñ JSR :

9 ./.4ODKO D CDC API J2SE 1.3 API CLDC ÿ API Protocol Support File URL - File Uniform Resource Locator JAR Java Archive :./. AK@K J2SE java.lang.*, java.io.*, java.util.*, java.math.* java.lang.ref.*, java.lang.reflect.* java.net.* java.security.*, java.security.cert.* java.text.*, java.text.resources.* java.util.jar.*, java.util.zip.* CLDC javax.microedition.io.* :

10 2 /5 2HA D GEHKF@M HG/DO BD5KHE D CLDC MID(Mobile Information Device) API Profile MID Cellular Phone, Pager, PDA, MIDP Display : 96x54 LCD Memory 128 KB for MIDP Impl. 8KB for 32 KB for Networking: Two-way, wireless, possibly intermittent, with limited bandwidth :< 2 /5 2HA D GEHKF@M HG/DO BD5KHE D MIDP (life cycle, ) User interface, Event Hanlding Persistent Storage Networking Timers MIDP System-level API Application Delivery and Management Low-level Security ;9

11 ,2 DK ;:,2 ezjava ñ UP.browser 1. ó HTTP WML 2. UP.Browser startjam(descurl) 5. JAR JAM 3. ñ 4. JAR ñ JARf Flash 6. KVM 7. JAR KVM 8. ñ URL post Servlet/CGI ;;

12 #20 Chip Solutions ARM - Jazelle Zucotto - Xpresso JEDI Tech - JStar JAIN TM JINI RealTime Spec for Java (JSR ) Java Network Launching Protocol and API (JSR ) Java Agent Services (JSR ) OSGi (Open Service Gateway Initiative) BlueTooth ; 2 / DM

13 2 /5 DOD,KB MDBMNKD; D JF M/Daa]Z X Z`_ L J6 a Z Z Daa]Z X Z`_ KX Z Daa]Z X Z`_ JF M L J/ a Z Z ]X I KX Z / ^/ ` Xc JF / J`YZ] /F_ `c^x Z`_/ Z 2 ; :LDK GMDKE@BD UI : Phone-like UI API High Level Abstraction MIDP Look & Feel ó UI (,, ), Key, pointer So, highly portable Business Application ÿ Form & Item, List, TextBox, Alert ;

14 :LDK API Little Abstraction UI (,, ) ó Key, pointer So, not guaranteed to be portable Game Canvas, Graphics ; :LDK GMDKE@BD ;

15 3DM HK G CLDC Generic Connection Famework HTTP1.1 - HttpConnection ` Z`_ c X^ ` Z`_ K` Z Z c F_a ` Z`_ L a ` Z`_ X X cx^ ` Z`_ c X^ ` Z`_ `_ _ ` Z`_ a ` Z`_ ;< 5DKL LMDGM8MHK@ D MIDP RMS (Record Management System) Simple Record-Oriented Database Record Store Collection of records Individual record store operations are atomic. Records Array of bytes Uniquely identified by record ID in a record store API for RMS RecordStore, RecordEnumeration, RecordFilter, RecordListener, 9

16 9 FDK MIDP ÿ, API Timer : Timer TimerTask : Timer ÿ :,II B@M HG2HCD MIDlet : MIDP Application MIDlet Suite ÿ MIDlet ñ ñ Runtime environment (resouces, classes, RMS) MIDlet Life Cycle ;

17 ,II HG/DI H FDGM JAD (Java Application Descriptor) MIDlet-Name : PhoneDic MIDlet-Version : MIDlet-Vendor : Ovytz Co., Ltd. MIDlet-Description : Dictionary of English MIDlet-Jar-URL : MIDlet-Jar-Size : MIDlet-Data-Size : 1024 MIDlet-1 : PhoneDic, /icon/dic.png, com.ovytz.phonedic.phonedic Jar (Java ARchive) Packaging MANIFEST file : contains application attribute MIDlet class & others Resources(Icon, Image, etc ) 2 / DM/DO5KHBDLL : javac 3. : preverify 4. :jar ÿ 5. Application Descriptor (.jad) jar url 6. Web server ò.jad.jar

18 2 / DM /DFH Thank you! for more information : to (mobilian@netsgo.com)