decompress Jar - Java Reflection

Java examples for Reflection:Jar

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Description

decompress Jar

Demo Code


import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class Main{
    public static List<String> decompressJar(String jarPath,
            String outPath, String[] filter) throws Exception {
        JarFile jarFile = new JarFile(jarPath);
        List<String> webWars = new ArrayList<String>();
        Enumeration<JarEntry> entrys = jarFile.entries();
        while (entrys.hasMoreElements()) {
            JarEntry entry = entrys.nextElement();
            String name = entry.getName();
            if (name.contains("about.html"))
                continue;
            for (String string : filter) {
                if (name.contains(string)) {
                    String file = extractJarEntry(outPath, jarFile, entry);
                    webWars.add(file);/*from   w w  w. ja  va2s  .c o  m*/
                }
            }
        }
        jarFile.close();
        return webWars;
    }
    public static String extractJarEntry(String outPath, JarFile jarFile,
            JarEntry entry) throws Exception {
        outPath = outPath.endsWith("/") ? outPath : outPath + '/';
        File file = new File(outPath + entry.getName());
        if (!file.exists()) {
            if (entry.isDirectory()) {
                file.mkdirs();
            } else {
                file.getParentFile().mkdirs();
                InputStream is = jarFile.getInputStream(entry);
                IOUtil.copy(is, new FileOutputStream(file));
            }
        }
        return file.getCanonicalPath();

    }
}

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