在指定的路径中的Jar文件中寻找自己所需要的class 博客分类： JavaWebSphereMacIBM JavaJDKJarClass

//功能：在指定的路径中的Jar文件中寻找自己所需要的class
//用法：提供本地磁盘路径和所需要的class的全称（包括package等信息）
//例如：Java -cp . JarClassFind Path ClassName
//eg:  Java -cp . JarClassFind F:\JDK java.applet.Applet

import java.io.File;
import java.util.Enumeration;
import java.util.jar.JarFile;

public class JarClassFind
{
	public static int	count	= 0;

	public JarClassFind()
	{
	}

	private static void findClassInLocalSystem(String path, String classname)
	{
		if ((path.charAt(path.length() - 1)) != File.separatorChar)
		{
			path += File.separatorChar;
		}
		File file = new File(path);
		if (!file.exists())
		{
			System.out.println("Error: Path not Existed! Please Check it out!");
			return;
		}
		String[] filelist = file.list();
		if (filelist != null)
		{
			for (int i = 0; i < filelist.length; i++)
			{
				File temp = new File(path + filelist[i]);
				if ((temp.isDirectory() && !temp.isHidden() && temp.exists()))
				{
					findClassInLocalSystem(path + filelist[i], classname);
				}
				else
				{
					if (filelist[i].endsWith(".jar"))
					{
						try
						{
							JarFile jarfile = new JarFile(path + filelist[i]);
							for (Enumeration enumeration = jarfile.entries(); enumeration.hasMoreElements();)
							{
								String name = enumeration.nextElement().toString();
								if (name.equals(classname))
								{
									System.out.print("No." + ++JarClassFind.count);
									System.out.println("\t" + path + filelist[i]);
									// System.out.println(name);
								}
							}
							jarfile.close();
						}
						catch (Exception ex)
						{
							ex.printStackTrace();
						}
					}
				}
			}
		}
		else
		{
			System.out.println("File list is null or Permission denied, please check : " + path);
		}
	}

	public static void main(String[] args)
	{
		System.out.print("You are searching Java Class on: " + System.getProperty("os.name"));
		System.out.println("\t\tFile.separator is : " + File.separator);

		if (args.length < 2)
		{
			showHowToUsage();
			return;
		}
		String absoluteclassname = args[1].replace('.', '/') + ".class";
		System.out.println("Find class [" + args[1] + "] in Path [" + args[0] + "] Results:");
		findClassInLocalSystem(args[0], absoluteclassname);
		if (JarClassFind.count == 0)
		{
			System.out.println("Error:Can't Find Such Jar File!");
		}
		System.out.println("Find Process Ended! Total Results:" + JarClassFind.count);
	}

	private static void showHowToUsage()
	{
		System.out.println("Usage: Java -cp . JarClassFind <source path> <source class name>");
		System.out.println("Usage: Java -classpath . JarClassFind <source path> <source class name>");
		System.out.println("");
		System.out.println("<source path>:\t\tPath to Find eg:F:\\JDK");
		System.out.println("<source class name>:\tClass to Find eg:java.applet.Applet");
	}
}