extract manifest from url stream

JarManifestTest.java

package test;

import org.hamcrest.core.Is;
import org.junit.Test;

import java.net.JarURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Map;
import java.util.jar.Attributes;

import static org.junit.Assert.assertThat;

/**
 * Created with IntelliJ IDEA.
 * User: bhkim
 * Date: 12. 4. 25.
 * Time: 오후 1:15
 */
public class JarManifestTest {
    @Test
    public void httpjarAttributes() {
        Attributes attributes = this.getJarManifestAttribute("http://repo1.maven.org/maven2/org/eclipse/jetty/osgi/jetty-osgi-boot/8.1.3.v20120416/jetty-osgi-boot-8.1.3.v20120416.jar");
        for (Map.Entry<Object, Object> entry : attributes.entrySet()) {
            System.out.println("key :" + entry.getKey() + " | value :" + entry.getValue());
        }
    }

    @Test
    public void osgifiedvalidationtest() {
        assertThat(isOsgifiedBundle(this.getJarManifestAttribute("http://repo1.maven.org/maven2/org/eclipse/jetty/osgi/jetty-osgi-boot/8.1.3.v20120416/jetty-osgi-boot-8.1.3.v20120416.jar")), Is.is(true));
        assertThat(isOsgifiedBundle(this.getJarManifestAttribute("http://repo1.maven.org/maven2/javax/annotation/jsr250-api/1.0/jsr250-api-1.0.jar")), Is.is(false));
    }

    @Test
    public void normalizetest() {
        assertThat(normalize("http://repo1.maven.org/maven2/javax/annotation/jsr250-api/1.0/jsr250-api-1.0.jar"), Is.is("http://repo1.maven.org/maven2/javax/annotation/jsr250-api/1.0/jsr250-api-1.0.jar!/"));
    }


    public Attributes getJarManifestAttribute(String urlstr) {
        URL url = null;
        JarURLConnection uc = null;
        try {
            url = this.getJarfiedURL(urlstr);
            uc = (JarURLConnection) url.openConnection();
            return uc.getMainAttributes();
        } catch (Exception e) {
            // ignore
        }
        return null;
    }

    public boolean isOsgifiedBundle(Attributes attributes) {
        return attributes != null && attributes.getValue("Bundle-SymbolicName") != null;
    }

    /**
     * @param strurl
     * @return
     */
    public URL getJarfiedURL(String strurl) {
        URL url = null;
        try {
            url = new URL("jar", "", normalize(strurl));
        } catch (MalformedURLException e) {
        }
        return url;
    }

    /**
     * Jar URL형태로 변환
     *
     * @param strurl
     * @return
     */
    public String normalize(String strurl) {
        return strurl != null && !strurl.endsWith("!/") ? strurl + "!/" : strurl;
    }
}