test Un Jar - Java Reflection

Java examples for Reflection:Jar

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Description

test Un Jar

Demo Code


import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;

public class Main{
    public static void testUnJar() {
        String targetPath = System.getProperty("user.home")
                + File.separator + "temp" + File.separator
                + "education-1.jar";
        File jarFile = new File(targetPath);
        File toDir = new File(System.getProperty("user.home")
                + File.separator + "temp");
        try {/*from   www . j  a  v a  2  s  .c om*/
            JarUtil.unJar(jarFile, toDir);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void unJar(File jarFile, File toDir) throws IOException {
        JarFile jar = new JarFile(jarFile);
        try {
            @SuppressWarnings("rawtypes")
            Enumeration entries = jar.entries();
            while (entries.hasMoreElements()) {
                JarEntry entry = (JarEntry) entries.nextElement();
                if (!entry.isDirectory()) {
                    InputStream in = jar.getInputStream(entry);
                    try {
                        File file = new File(toDir, entry.getName());
                        if (!file.getParentFile().mkdirs()) {
                            if (!file.getParentFile().isDirectory()) {
                                throw new IOException(
                                        "Mkdirs failed to create "
                                                + file.getParentFile()
                                                        .toString());
                            }
                        }
                        OutputStream out = new FileOutputStream(file);
                        try {
                            byte[] buffer = new byte[8192];
                            int i;
                            while ((i = in.read(buffer)) != -1) {
                                out.write(buffer, 0, i);
                            }
                        } finally {
                            out.close();
                        }
                    } finally {
                        in.close();
                    }
                }
            }
        } finally {
            jar.close();
        }
    }
}

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