Examples of java.net.JarURLConnection

java.net.JarURLConnection
oo.com/bar/baz.jar!/COM/foo/Quux.class

Jar URLs should be used to refer to a JAR file or entries in a JAR file. The example above is a JAR URL which refers to a JAR entry. If the entry name is omitted, the URL refers to the whole JAR file: jar:http://www.foo.com/bar/baz.jar!/
Users should cast the generic URLConnection to a JarURLConnection when they know that the URL they created is a JAR URL, and they need JAR-specific functionality. For example:
```
 URL url = new URL("jar:file:/home/duke/duke.jar!/"); JarURLConnection jarConnection = (JarURLConnection)url.openConnection(); Manifest manifest = jarConnection.getManifest(); 
```
JarURLConnection instances can only be used to read from JAR files. It is not possible to get a {@link java.io.OutputStream} to modify or write to the underlying JAR file using this class.
Examples:

A Jar entry
jar:http://www.foo.com/bar/baz.jar!/COM/foo/Quux.class
A Jar file
jar:http://www.foo.com/bar/baz.jar!/
A Jar directory
jar:http://www.foo.com/bar/baz.jar!/COM/foo/

!/ is refered to as the separator.
When constructing a JAR url via new URL(context, spec), the following rules apply:
- if there is no context URL and the specification passed to the URL constructor doesn't contain a separator, the URL is considered to refer to a JarFile.
- if there is a context URL, the context URL is assumed to refer to a JAR file or a Jar directory.
- if the specification begins with a '/', the Jar directory is ignored, and the spec is considered to be at the root of the Jar file.
  Examples:
  
  context: jar:http://www.foo.com/bar/jar.jar!/, spec:baz/entry.txt
  url:jar:http://www.foo.com/bar/jar.jar!/baz/entry.txt
  context: jar:http://www.foo.com/bar/jar.jar!/baz, spec:entry.txt
  url:jar:http://www.foo.com/bar/jar.jar!/baz/entry.txt
  context: jar:http://www.foo.com/bar/jar.jar!/baz, spec:/entry.txt
  url:jar:http://www.foo.com/bar/jar.jar!/entry.txt
@see java.net.URL @see java.net.URLConnection @see java.util.jar.JarFile @see java.util.jar.JarInputStream @see java.util.jar.Manifest @see java.util.zip.ZipEntry @author Benjamin Renaud @since 1.2

    // workaround for bug where cached applet loader does not have certificates!?
    if (certificate == null) {
      URL location = AppletLoader.class.getProtectionDomain().getCodeSource().getLocation();


      // manually load the certificate
      JarURLConnection jurl = (JarURLConnection) (new URL("jar:" + location.toString() + "!/org/lwjgl/util/applet/AppletLoader.class").openConnection());
      jurl.setDefaultUseCaches(true);
      certificate = jurl.getCertificates();
    }
    
    for (int i = urlList.length - nativeJarCount; i < urlList.length; i++) {
      
      // if a new native jar was not downloaded, no extracting needed

View Full Code Here

   protected Manifest findManifest(URL url) throws Exception
   {
      URLConnection conn = url.openConnection();
      if (conn instanceof JarURLConnection)
      {
         JarURLConnection jarConn = (JarURLConnection)conn;
         return jarConn.getManifest();
      }
      else
      {
         File parent = new File(url.toURI());
         File child = new File(parent, JarFile.MANIFEST_NAME);

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                if (manifest.getPath().startsWith("http://"))
                {
                  // protocol formats: 
                  //     jar:http:<path>!<manifest-file>, zip:http:<path>!<manifest-file>
                  // e.g jar:http://<host>[:port]/[app-path]/jpox-java5.jar!/plugin.xml
                  JarURLConnection jarConnection = (JarURLConnection) manifest.openConnection();
                  URL url = jarConnection.getJarFileURL();
                  mf = jarConnection.getManifest();
                  if (mf == null)
                  {
                      return null;
                  }
                  return registerBundle(mf, url);

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                    }
                }


            } else if ("jar".equals(url.getProtocol())) {


                JarURLConnection conn = (JarURLConnection) url.openConnection();


                JarFile jar = conn.getJarFile();


                Enumeration<JarEntry> en = jar.entries();


                while (en.hasMoreElements()) {
                    JarEntry jarEntry = en.nextElement();

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                if (manifest.getPath().startsWith("http://"))
                {
                  // protocol formats: 
                  //     jar:http:<path>!<manifest-file>, zip:http:<path>!<manifest-file>
                  // e.g jar:http://<host>[:port]/[app-path]/jpox-java5.jar!/plugin.xml
                  JarURLConnection jarConnection = (JarURLConnection) manifest.openConnection();
                  URL url = jarConnection.getJarFileURL();
                  mf = jarConnection.getManifest();
                  if (mf == null)
                  {
                      return null;
                  }
                  return registerBundle(mf, url);

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   * We don't use getContentEncoding() on the URL connection, because it might leave open streams behind.
   * See https://bugs.eclipse.org/bugs/show_bug.cgi?id=117890 
   */
  protected String getURLContents(String docUrlValue) throws JavaModelException {
    InputStream stream = null;
    JarURLConnection connection2 = null;
    try {
      URL docUrl = new URL(docUrlValue);
      URLConnection connection = docUrl.openConnection();
      if (connection instanceof JarURLConnection) {
        connection2 = (JarURLConnection) connection;
        // https://bugs.eclipse.org/bugs/show_bug.cgi?id=156307
        connection.setUseCaches(false);
      }
      stream = new BufferedInputStream(connection.getInputStream());
      String encoding = connection.getContentEncoding();
      byte[] contents = org.aspectj.org.eclipse.jdt.internal.compiler.util.Util.getInputStreamAsByteArray(stream, connection.getContentLength());
      if (encoding == null) {
        int index = getIndexOf(contents, CONTENT_TYPE, 0);
        if (index != -1) {
          index = getIndexOf(contents, CONTENT, index);
          if (index != -1) {
            int offset = index + CONTENT.length;
            int index2 = getIndexOf(contents, CLOSING_DOUBLE_QUOTE, offset);
            if (index2 != -1) {
              final int charsetIndex = getIndexOf(contents, CHARSET, offset);
              if (charsetIndex != -1) {
                int start = charsetIndex + CHARSET.length;
                encoding = new String(contents, start, index2 - start, "UTF-8"); //$NON-NLS-1$
              }
            }
          }
        }
      }
      try {
        if (encoding == null) {
          encoding = this.getJavaProject().getProject().getDefaultCharset();
        }
      } catch (CoreException e) {
        // ignore
      }
      if (contents != null) {
        if (encoding != null) {
          return new String(contents, encoding);
        } else {
          // platform encoding is used
          return new String(contents);
        }
      }      
     } catch (MalformedURLException e) {
       throw new JavaModelException(new JavaModelStatus(IJavaModelStatusConstants.CANNOT_RETRIEVE_ATTACHED_JAVADOC, this));
    } catch (FileNotFoundException e) {
      // ignore. see bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=120559
    } catch(IOException e) {
      StringWriter stringWriter = new StringWriter();
      PrintWriter writer = new PrintWriter(stringWriter);
      e.printStackTrace(writer);
      writer.flush();
      writer.close();
      throw new JavaModelException(new JavaModelStatus(IJavaModelStatusConstants.CANNOT_RETRIEVE_ATTACHED_JAVADOC, this, String.valueOf(stringWriter.getBuffer())));
    } finally {
      if (stream != null) {
        try {
          stream.close();
        } catch (IOException e) {
          // ignore
        }
      }
      if (connection2 != null) {
        try {
          connection2.getJarFile().close();
        } catch(IOException e) {
          // ignore
        } catch(IllegalStateException e) {
          /*
           * ignore. Can happen in case the stream.close() did close the jar file

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        if (rc == null) {
            // guess the home from the location of the jar
            URL url = mainClass.getClassLoader().getResource(mainClass.getName().replace(".", "/") + ".class");
            if (url != null) {
                try {
                    JarURLConnection jarConnection = (JarURLConnection) url.openConnection();
                    url = jarConnection.getJarFileURL();
                    rc = new File(new URI(url.toString())).getCanonicalFile().getParentFile().getParentFile();
                } catch (Exception ignored) {
                }
            }
        }

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        // guess from the location of the jar
        URL url = JAXWSToolsCLI.class.getClassLoader().getResource("META-INF/startup-jar");
        if (url != null) {
            try {
                JarURLConnection jarConnection = (JarURLConnection) url.openConnection();
                url = jarConnection.getJarFileURL();


                URI baseURI = new URI(url.toString()).resolve("..");
                File dir = new File(baseURI);                
                return dir.getAbsolutePath();
            } catch (Exception ignored) {

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            } catch (IOException e) {
                return COLLECTION;
            }
        } else {
            URL jarURL = new URL("jar:" + url.toString() + "!/");
            JarURLConnection jarConnection = (JarURLConnection) jarURL.openConnection();
            try {
                jarConnection.getManifest();
                return PACKED_ARCHIVE;
            } catch (ZipException e) {
                return RESOURCE;
            }
        }

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        }


        // extract the manifest
        Manifest manifest;
        try {
            JarURLConnection jarConnection = (JarURLConnection) url.openConnection();
            manifest = jarConnection.getManifest();
        } catch (IOException e) {
            System.err.println("Startup jar does not contain a manifest: " + url);
            System.exit(1);
            throw new AssertionError();
        }

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