packager.java

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package com.eline.kjava.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Properties;
import java.util.Set;
import java.util.jar.Attributes;
import java.util.jar.JarFile;
import java.util.jar.Manifest;

/**
 * KJAVA的打包工具类。
 * 比如读取jar文件信息来生成相应的jad文件
 * @author Lucifer
 *
 */
public class Packager {
	/**
	 * 
	 * @param jarFile
	 * @throws IOException
	 */
	public static String generanteJADFile(String jarFile) throws IOException {
		Properties properties = new Properties();
		JarFile jar = null;
		try {
			jar = new JarFile(jarFile);
			Manifest man = jar.getManifest();
			
			Attributes attrs = man.getMainAttributes();
			Set set = attrs.entrySet();
			Iterator i = set.iterator();
			
			while (i.hasNext()) {
				Object obj = i.next();
				System.out.println(obj);
	
				String[] keyValue = (String.valueOf(obj)).split("=");
				if (keyValue.length == 2) {
					String key = keyValue[0].trim();
					String value = keyValue[1].trim();
					properties.setProperty(key, value);
				}
			}
		} catch (IOException e) {
			throw e;
		} finally {
			if (jar != null)
				jar.close();
		}

		int tmpPos = Math.max(jarFile.lastIndexOf('/'), jarFile.lastIndexOf('\\'));
		String s1 = tmpPos > 0 ? jarFile.substring(tmpPos + 1) : jarFile;
		System.out.println("s1 = " + s1);

		properties.setProperty("MIDlet-Jar-URL", s1);
		properties.setProperty("MIDlet-Jar-Size", String.valueOf(new File(jarFile).length()));

		tmpPos = jarFile.lastIndexOf(".");
		String s2 = (tmpPos > 0 ? jarFile.substring(0, tmpPos) : jarFile) + ".jad";
		System.out.println("s2 = " + s2);
		saveManifest(properties, new File(s2));
		
		return s2;
	}
	
	// public static final String MANIFEST_CHARSET = "ISO-8859-1";
	public static final String MANIFEST_CHARSET = "UTF-8";

	/**
	 * 
	 * @param props
	 * @param file
	 * @throws IOException
	 */
	public static void saveManifest(Properties props, File file) throws IOException {
		OutputStreamWriter osw = new OutputStreamWriter(
				new FileOutputStream(file),
				MANIFEST_CHARSET);
		Enumeration tmpKeys = props.keys();
		while (tmpKeys.hasMoreElements()) {
			String tmpKey = (String) tmpKeys.nextElement();
			osw.write(tmpKey + ": " + props.get(tmpKey)+"\n");
		}
		osw.flush();
		osw.close();
	}
}