BlogJava-宝宝堂-随笔分类-j2mehttp://www.blogjava.net/soddabao/category/23514.html喜欢没事学点东西,喜欢开开心心侃东侃西,喜欢土里土气的活着,喜欢享受好的坏的的生活。zh-cnTue, 15 Jan 2008 23:57:15 GMTTue, 15 Jan 2008 23:57:15 GMT60log4j2me 开源的j2me日志工具http://www.blogjava.net/soddabao/archive/2008/01/15/175353.html冷面阎罗冷面阎罗Tue, 15 Jan 2008 01:03:00 GMThttp://www.blogjava.net/soddabao/archive/2008/01/15/175353.htmlhttp://www.blogjava.net/soddabao/comments/175353.htmlhttp://www.blogjava.net/soddabao/archive/2008/01/15/175353.html#Feedback0http://www.blogjava.net/soddabao/comments/commentRss/175353.htmlhttp://www.blogjava.net/soddabao/services/trackbacks/175353.html

log4j2me is log4j for j2me platform. It is an open source contribution from Witmate.

It is compatible with Log4J and executable on J2ME platform. When your code move to J2SE/J2EE platform, you need NOT change your code, just replace log4j2me.jar with standard log4j jar file.

 

Contact us about log4j2me by log4j2me@witmate.com

 

 

 

 

 

 

 

        

Differentiations with original log4j

Limits by j2me platform:

 

  1. j2me can't write to file. So can't set file name directly in FileAppender
  2. j2me can't read file. So can't read configuration from file directly in PropertyConfigurator. But it is possible to get configuration from JAD file.
  3. j2me only can print stack track into standard error output. So can't get stack in LoggingEvent, LocationInfo
  4. J2ME has not java.text package, so %d parameter just use log4j date formatters.
  5. LEVEL_CONVERTER does not work in PatternParser
  6. MESSAGE_CONVERTER(RenderMessage) does not work in PatternParser
  7. Fully qualified name of the calling category class (fqnOfCategoryClass) is same as category name in LoggingEvent.
  8. These parameters of pattern do not work: %X, %F, %M, %L, %l, and log out a question mark.

Extensions for j2me platform

  1. Configure by JAD file
  2. j2me can't get property list, so a "log4j.categories" property key to list all category names is added into configuration properties. Separator is comma, e.g., log4j.categories: classA,classB
  3. line.separator system property does not exist in J2ME default, LINE_SEP of log4j2me is LF(13) in Layout. It is configurable with LINE_SEP and LINE_SEP_LEN parameetr in Layout
  4. MIDLet form appender: Output log to a MIDLet form.
    • New form appender is log4j2me.util.FormAppender.
    • Optional handler of this appender is Title, this title is MIDLet form title.
    • Configure example

                log4j.appender.LOGFORM = log4j2me.util.FormAppender         
                log4j.appender.LOGFORM.Title = mylog4j2me

                 

Test cases in source code

  • log4j2me.test.Hello.java is a java application test case of configuring log4j2me by code.
  • log4j2me.test.midlets.MHello.java is a midlet test case for j2me platform and configuring log4j2me by example JAD file.

Downloads

    log4j2me.jar  or Witmate with log4j2me

    Source Code of log4j2me

    JDA example file for MHello test case



冷面阎罗 2008-01-15 09:03 发表评论
]]>J2ME程序的奇怪现象http://www.blogjava.net/soddabao/archive/2007/06/28/126901.html冷面阎罗冷面阎罗Thu, 28 Jun 2007 11:01:00 GMThttp://www.blogjava.net/soddabao/archive/2007/06/28/126901.htmlhttp://www.blogjava.net/soddabao/comments/126901.htmlhttp://www.blogjava.net/soddabao/archive/2007/06/28/126901.html#Feedback1http://www.blogjava.net/soddabao/comments/commentRss/126901.htmlhttp://www.blogjava.net/soddabao/services/trackbacks/126901.html
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;


public class TestExit extends MIDlet implements CommandListener {
    private Display display;
    private Form form;
    private final static Command cmd_exit=new Command("EXit",Command.EXIT,1);

    public TestExit() {
        display=Display.getDisplay(this);
        form=new Form("Exit");
    }

    protected void destroyApp(boolean arg0) throws MIDletStateChangeException {

    }

    protected void pauseApp() {

    }

    protected void startApp() throws MIDletStateChangeException {
        form.addCommand(cmd_exit);
        form.setCommandListener(this);        
        display.setCurrent(form);

    }

    public void commandAction(Command c, Displayable d) {
        if(c==cmd_exit){
            System.out.println("in");
            try {
                destroyApp(false);
                notifyAll();
            } catch (MIDletStateChangeException e) {
                e.printStackTrace();
            }
        }
    }

}
出的错误如下：
java.lang.IllegalMonitorStateException
    at TestExit.commandAction(+24)
    at javax.microedition.lcdui.Display$DisplayAccessor.commandAction(+280)
    at javax.microedition.lcdui.Display$DisplayManagerImpl.commandAction(+10)
    at com.sun.midp.lcdui.DefaultEventHandler.commandEvent(+68)
    at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.run(+258)


冷面阎罗 2007-06-28 19:01 发表评论
]]>J2ME学习笔记(一) (内含table类)http://www.blogjava.net/soddabao/archive/2007/06/24/125977.html冷面阎罗冷面阎罗Sun, 24 Jun 2007 14:06:00 GMThttp://www.blogjava.net/soddabao/archive/2007/06/24/125977.htmlhttp://www.blogjava.net/soddabao/comments/125977.htmlhttp://www.blogjava.net/soddabao/archive/2007/06/24/125977.html#Feedback1http://www.blogjava.net/soddabao/comments/commentRss/125977.htmlhttp://www.blogjava.net/soddabao/services/trackbacks/125977.html      1、createImage图片的引入 ，注意相对路径！J2ME的程序,资源文件可以放在两个地方 --- classes和res, 其中放在res下面是比较规范的做法,而且放在两个地方引用的代码都是一样的: Image = Image.createImage( "/1.png" );且不支持gif格式图片
      2、MULTIPLE  如何判断选择和为选择的？ 不能使用index来判断是否被选中，可以使用getSelectedFlags(flags); flags为boolean类型的一个数组 然后判断true or false。
      3、j2me中没有table类，一般都是自己写类实现与table类似的功能。
       我写的一个table类，肯定不能和sun公司的table想比美，不过基本上实现我想要的功能，我把jar和javadoc传上来，还希望大家对我的table多多提意见，想要源代码可以和我联系，或是这样jad反编辑。
      table为原创，自定义的table类，欢迎大家转载，转载时请注明出处：http://www.blogjava.net/soddabao
    

冷面阎罗 2007-06-24 22:06 发表评论
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