Criar Arquivo JAR com JarOutputStream

Esse código permite adicionar pastas (pacotes) e arquivos dentro do .jar.

CriandoJARTeste.java
import java.io.BufferedInputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.jar.Attributes; import java.util.jar.JarEntry; import java.util.jar.JarOutputStream; import java.util.jar.Manifest; /* * To change this template, choose Tools | Templates * and open the template in the editor. */ /** * * @author Andreia */ public class CriandoJARTeste { protected void criarArquivoJAR(File arquivoJAR, File[] sources) throws IOException { Manifest manifest = new Manifest(); manifest.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0"); // // define o nome da classe principal // manifest.getMainAttributes().put(Attributes.Name.MAIN_CLASS, mainClass); JarOutputStream jarOut = new JarOutputStream(new FileOutputStream(arquivoJAR), manifest); for (int i = 0; i < sources.length; i++) { if (sources[i] == null || !sources[i].exists()) { continue; } System.out.println("Adicionando " + sources[i].getPath()); adicionar(sources[i], jarOut); } jarOut.close(); System.out.println("JAR concluído!"); } private void adicionar(File source, JarOutputStream jarOut) throws IOException { BufferedInputStream in = null; try { if (source.isDirectory()) { String name = source.getPath().replace("\\", "/"); if (!name.isEmpty()) { if (!name.endsWith("/")) { name += "/"; } JarEntry entry = new JarEntry(name); entry.setTime(source.lastModified()); jarOut.putNextEntry(entry); jarOut.closeEntry(); } for (File nestedFile : source.listFiles()) { adicionar(nestedFile, jarOut); } return; } JarEntry entry = new JarEntry(source.getPath().replace("\\", "/")); entry.setTime(source.lastModified()); jarOut.putNextEntry(entry); in = new BufferedInputStream(new FileInputStream(source)); byte[] buffer = new byte[1024]; while (true) { int count = in.read(buffer); if (count == -1) { break; } jarOut.write(buffer, 0, count); } jarOut.closeEntry(); } finally { if (in != null) { in.close(); } } } public static void main(String[] args) { CriandoJARTeste criandoJARTeste = new CriandoJARTeste(); File[] sources = new File[]{new File("novoPrograma1")}; try { criandoJARTeste.criarArquivoJAR(new File("MeuJAR.jar"), sources); } catch (IOException ex) { ex.printStackTrace(); } } }


Achei esse outro método para criar JAR que também permite adicionar pacotes:

CriandoJARTeste2.java
import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.util.Enumeration; import java.util.jar.JarEntry; import java.util.jar.JarFile; import java.util.jar.JarOutputStream; /* * To change this template, choose Tools | Templates * and open the template in the editor. */ /** * * @author Andreia */ public class CriandoJARTeste2 { protected void criarArquivoJAR(File arquivoJAR) throws IOException { JarOutputStream jar = new JarOutputStream(new FileOutputStream(arquivoJAR)); jar.putNextEntry(new JarEntry("teste1.txt")); jar.write("Um teste\n".getBytes()); jar.putNextEntry(new JarEntry("dir/teste2.txt")); jar.write("Outro teste\n".getBytes()); jar.close(); JarFile in = new JarFile(arquivoJAR); Enumeration<JarEntry> entries = in.entries(); while (entries.hasMoreElements()) { JarEntry entry = entries.nextElement(); System.out.println(entry); } in.close(); } public static void main(String[] args) { CriandoJARTeste2 criandoJARTeste2 = new CriandoJARTeste2(); try { criandoJARTeste2.criarArquivoJAR(new File("MeuJAR.jar")); } catch (IOException ex) { ex.printStackTrace(); } } }

Fontes:
http://stackoverflow.com/questions/1281229/how-to-use-jaroutputstream-to-create-a-jar-file
http://javafree.uol.com.br/topic-886248-Usando-JarEntry.html