📄 根据midlet套件自动生成jad文件-开发者网络-midlet-天极yesky.htm
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<H1>根据MIDlet套件自动生成jad文件</H1></DIV>
<DIV id=conauthor><SPAN>2006-02-23 11:08 </SPAN><SPAN>作者: mingjava
</SPAN><SPAN>出处: j2me开发网 </SPAN><SPAN>责任编辑:<A title=向本编辑提问
href="http://comments.yesky.com/t/·½ÖÛ/6,324/2313067.shtml" target=_blank>方舟</A>
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<DIV class=guanggao><SPAN
id=contentAdv></SPAN></DIV> 我们经常遇到有jar文件但是却没有jad文件的情况,这时候如果你想使用模拟器来运行恐怕麻烦一些。当然你可以根据jar文件中的Manifest.mf文件,自己手写jad文件。需要注意的是自己手写的时候一定不能忽略如下两个参数:MIDlet-Jar-Size和MIDlet-Jar-URL。
<BR><BR> 互联网上也有一些工具可以根据jar文件自动生成jad文件。下面我们使用<A class=bluekey
href="http://dev.yesky.com/devjava/"
target=_blank>java</A>来实现一个简单的jad文件生成器。解决这个问题的关键在于使用java.util.jar包提供的api解析jar包,然后将其Manifest文件中的内容写入到一个新的文件中,最后把MIDlet-Jar-Size和MIDlet-Jar-URL写入到jad文件中。参考源码如下所示:<BR><BR>
<TABLE borderColor=#cccccc width="90%" align=center bgColor=#e3e3e3 border=1>
<TBODY>
<TR>
<TD>package com.j2medev.parsejar;<BR>import java.io.*;import
java.util.jar.*;import java.util.*;<BR>public class JarParser {<BR> /** *
@param args */<BR> public static void main(String[] args) throws
IOException {<BR> // TODO Auto-generated method stub<BR> File file = new
File("c:\\simple.jar"); <BR> if (!file.exists()) { System.exit(0);
}<BR> JarFile jar = new JarFile(file);<BR> Manifest mf =
jar.getManifest();<BR> Attributes att =
mf.getMainAttributes();<BR> PrintWriter jad = new PrintWriter( new
FileOutputStream("c:\\simple.jad")); <BR> Set key =
att.keySet();<BR> Iterator iterator = key.iterator(); <BR> while
(iterator.hasNext()) {<BR> String k = iterator.next().toString();
<BR> String v = (String) att.getValue(k); <BR> jad.println(k + ": " +
v); <BR> }<BR> jad.println("MIDlet-Jar-Size:
"+file.length());<BR> jad.println("MIDlet-Jar-URL:
simple.jar");<BR> jad.close();
<BR> }<BR>}</TD></TR></TBODY></TABLE><BR> 程序已经调试通过,如果有兴趣可以完善一下,添加一个图形用户界面。这样更容易操作。
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