A Java program to search for classes in JAR files

 1import java.util.jar.*;
 2import java.util.*;
 3import java.io.*;
 4
 5
 6public class JarSearch {
 7
 8	public static final String NL = System.getProperty("line.separator");
 9
10	public static void main(String args[]) {
11		if (args.length != 2){
12			System.out.println("You must provide 1. search directory and 2. search string");
13			System.exit(0);
14		}
15		JarSearch search = new JarSearch();
16		try{
17			String dir = args[0];
18			String searchStr = args[1];
19			search.searchDir(dir, searchStr);//"C:\\Program Files\\IBM\\Application Developer\\plugins\\com.ibm.etools.ctc.binding.java\\runtime\\ctcjava.jar");
20		}catch(IOException ioe){
21			System.out.println(ioe.toString());
22		}
23	}
24
25	public static void searchDir(String dirName, String searchStr)throws IOException{
26		File dir = new File(dirName);
27		if (!dir.isDirectory()){
28			throw new IOException(dir+" is not a directory !!!");
29		}
30		File files[] = dir.listFiles();
31		for (int i=0; i<files.length; i++){
32			if (files[i].isDirectory()){
33				searchDir(files[i].getAbsolutePath(), searchStr);
34			}else{
35				if (files[i].getName().endsWith(".jar")){
36					searchFile(files[i].getAbsolutePath(), searchStr);
37				}
38			}
39		}
40	}
41
42	public static void searchFile(String fileName, String searchStr)throws IOException{
43		boolean outputMessage = false;
44		StringBuffer buf = new StringBuffer();
45		int index1 = fileName.lastIndexOf("\\");
46		int index2 = fileName.lastIndexOf("/");
47		int index = -1;
48		if (index1 > index2){
49			index = index1;
50		}else{
51			index = index2;
52		}
53		buf.append(NL);
54
55		buf.append("DIR: ");
56		buf.append(fileName.substring(0, index));
57		buf.append(NL);
58
59		buf.append("JAR: ");
60		buf.append(fileName.substring(index+1));
61		buf.append(NL);
62
63		searchStr = searchStr.toLowerCase();
64
65		JarFile jar = new JarFile(fileName);
66		Enumeration e = jar.entries();
67		while (e.hasMoreElements()){
68			JarEntry entry = (JarEntry)e.nextElement();
69			String strEntry = entry.getName().toLowerCase();
70			if (strEntry.indexOf(searchStr) > -1){
71				outputMessage = true;
72				buf.append(entry.getName());
73				buf.append(NL);
74			}
75		}
76		if (outputMessage){
77			System.out.println(buf);
78		}
79	}
80}