import java.io.*; import java.util.jar.*; import java.util.zip.*; public class ExtractFromJAR { public void extractMyDBFromJAR(String dest){ try { String home = getClass().getProtectionDomain(). getCodeSource().getLocation().toString(). substring(6); JarFile jar = new JarFile(home); ZipEntry entry = jar.getEntry("mydb.mdb"); File efile = new File(dest, entry.getName()); InputStream in = new BufferedInputStream(jar.getInputStream(entry)); OutputStream out = new BufferedOutputStream(new FileOutputStream(efile)); byte[] buffer = new byte[2048]; for (;;) { int nBytes = in.read(buffer); if (nBytes <= 0) break; out.write(buffer, 0, nBytes); } out.flush(); out.close(); in.close(); } catch (Exception e) { e.printStackTrace(); } } public static void main(String args []){ new ExtractFromJAR().extractMyDBFromJAR("."); } }
运行,进行测试
java -jar mydb.jar
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