The Java Developers Almanac 1.4

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e382. Creating a Manifest for a JAR File

A manifest for a JAR file can only be created from an input stream. This example creates a manifest from a file and from a constructed string. The format of a manifest is described in:

    http://java.sun.com/products/jdk/1.2/docs/guide/jar/manifest.html

    try {
        // Create a manifest from a file
        InputStream fis = new FileInputStream("manifestfile");
        Manifest manifest = new Manifest(fis);
    
    
        // Construct a string version of a manifest
        StringBuffer sbuf = new StringBuffer();
        sbuf.append("Manifest-Version: 1.0\n");
        sbuf.append("\n");
        sbuf.append("Name: javax/swing/JScrollPane.class\n");
        sbuf.append("Java-Bean: True\n");
    
        // Convert the string to a input stream
        InputStream is = new ByteArrayInputStream(sbuf.toString().getBytes("UTF-8"));
    
        // Create the manifest
        manifest = new Manifest(is);
    } catch (IOException e) {
    }

Here's an example of a manifest file:

    Manifest-Version: 1.0
    Specification-Title: Java Platform API Specification
    Specification-Version: 1.4
    Implementation-Title: Java Runtime Environment
    Implementation-Version: 1.4.0-rc
    Created-By: 1.4.0-rc (Sun Microsystems Inc.)
    Implementation-Vendor: Sun Microsystems, Inc.
    Specification-Vendor: Sun Microsystems, Inc.
    
    Name: javax/swing/JScrollPane.class
    Java-Bean: True
    
    Name: javax/swing/JCheckBoxMenuItem.class
    Java-Bean: True
    
    Name: javax/swing/JTabbedPane.class
    Java-Bean: True
    
    Name: javax/swing/JMenuItem.class
    Java-Bean: True
    
    Name: javax/swing/JTable.class
    Java-Bean: True