The following code creates a JAR file that includes a manifest file.
import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.Map; import java.util.jar.Attributes; import java.util.jar.JarEntry; import java.util.jar.JarOutputStream; import java.util.jar.Manifest; import java.util.zip.Deflater; public class Main { public static void main(String[] args) throws Exception { // Create a Manifest object Manifest manifest = getManifest(); // Store jar entries in a String array String jarFileName = "jartest.jar"; String[] entries = new String[2]; entries[0] = "images/logo.bmp"; entries[1] = "com/book2s/archives/Test.class"; createJAR(jarFileName, entries, manifest); }// ww w . ja v a 2 s. c o m public static void createJAR(String jarFileName, String[] jarEntries, Manifest manifest) { // Get the current directory for later use String currentDirectory = System.getProperty("user.dir"); // Create the JAR file try (JarOutputStream jos = new JarOutputStream(new BufferedOutputStream( new FileOutputStream(jarFileName)), manifest)) { // Set the compression level to best compression jos.setLevel(Deflater.BEST_COMPRESSION); // Add each entry to JAR file for (int i = 0; i < jarEntries.length; i++) { // Make sure the entry file exists File entryFile = new File(jarEntries[i]); if (!entryFile.exists()) { System.out.println("The entry file " + entryFile.getAbsolutePath() + " does not exist"); System.out.println("Aborted processing."); return; } // Create a JarEntry object JarEntry je = new JarEntry(jarEntries[i]); // Add jar entry object to JAR file jos.putNextEntry(je); // Add the entry's contents to the JAR file addEntryContent(jos, jarEntries[i]); // Inform the JAR output stream that we are done // working with the current entry jos.closeEntry(); } System.out.println("Output has been written to " + currentDirectory + File.separator + jarFileName); } catch (IOException e) { e.printStackTrace(); } } public static void addEntryContent(JarOutputStream jos, String entryFileName) throws IOException, FileNotFoundException { // Create an input stream to read data from the entry file BufferedInputStream bis = new BufferedInputStream(new FileInputStream( entryFileName)); byte[] buffer = new byte[1024]; int count = -1; while ((count = bis.read(buffer)) != -1) { jos.write(buffer, 0, count); } bis.close(); } public static Manifest getManifest() { Manifest manifest = new Manifest(); /* * Add main attributes 1. Manifest Version 2. Main-Class 3. Sealed */ Attributes mainAttribs = manifest.getMainAttributes(); mainAttribs.put(Attributes.Name.MANIFEST_VERSION, "1.0"); mainAttribs.put(Attributes.Name.MAIN_CLASS, "com.book2s.archives.Test"); mainAttribs.put(Attributes.Name.SEALED, "true"); Map<String, Attributes> attribsMap = manifest.getEntries(); // Create an attribute "Sealed : false" and // add it for individual entry "Name: com/book2s/archives/" Attributes a1 = getAttribute("Sealed", "false"); attribsMap.put("com/book2s/archives/", a1); // Create an attribute "Content-Type: image/bmp" and // add it for images/logo.bmp Attributes a2 = getAttribute("Content-Type", "image/bmp"); attribsMap.put("images/logo.bmp", a2); return manifest; } public static Attributes getAttribute(String name, String value) { Attributes a = new Attributes(); Attributes.Name attribName = new Attributes.Name(name); a.put(attribName, value); return a; } }